The gut microbiota compensates for seasonal diet variation in the wild black howler monkey (Alouatta pigra) Katherine R. Amato1,2*, Steven R. Leigh2, Angela Kent3, Roderick I. Mackie4,5, Carl J. Yeoman6, Rebecca M. Stumpf5,7, Brenda A. Wilson5,8, Karen E. Nelson9, Bryan A. White4,5, Paul A. Garber7 1 Program in Ecology, Evolution, and Conservation Biology, University of Illinois, Urbana, IL, 61801; 2Department of Anthropology, University of Colorado, Boulder, CO 80309; 3Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL, 61801; 4 Department of Animal Sciences, University of Illinois, Urbana, IL, 61801; 5Institute for Genomic Biology, University of Illinois, Urbana, IL, 61801; f6Department of Animal and Range Sciences, Montana State University, Bozeman, MT, 59717; 7Department of Anthropology, University of Illinois, Urbana, IL, 80301; 8Department of Microbiology, University of Illinois, Urbana, IL, 61801; 9The J. Craig Venter Institute, Rockville, MD, 20850 * Author for correspondence: katherine.amato@colorado.edu, (773)952-0098, fax: (303)492-8425 Microbial Ecology Supporting Information Methods Diet data analysis: For behavioral data collection, the focal individual was chosen pseudorandomly (no individual was sampled twice consecutively and priority was given to individuals that had been undersampled on previous days). During each twenty minute behavioral sampling period, the focal individual’s activity was recorded every two minutes. Five activities were recorded: feeding (ingestion of food items), foraging (movement within a feeding tree), resting (inactivity), traveling (movement between trees), and social activity (howling, play, sexual interaction, aggression, etc.). During feeding bouts, the type of food resource (e.g. ripe fruit, unripe fruit, mature leaves, young leaves, flowers, and stems) was recorded as well as the plant species. The number of food items consumed per minute was quantified when possible to provide an estimate of intake rate. 1 We measured the average wet and dry mass of the top ten food items consumed during each sampling period (based on the percentage of feeding time) for each howler group and used these data together with intake rates to estimate macronutrient intake based on published values for specific plant species as well as average values for Neotropical fruits, leaves, and flowers (Amato and Garber 2014). We also preserved samples of the top ten food items in 70% methanol for metabolite profiling. Metabolite data were generated using gas chromatography separation and mass spectrometry analysis, as previously described (Poroyko et al 2011). 1.25mM of saturated C31 fatty acid (hentriacontanoic acid) was used as an internal standard in each sample. We reported metabolites in terms of relative concentration (compared to this internal standard) per gram of wet weight and categorized them into amino acids, sugars, and lipids when possible. Due to the method by which the metabolite concentrations were standardized, these data do not provide accurate estimates of the actual amount of each metabolite in a food item, nor can their amounts be accurately compared across categories (i.e. amino acid, sugar, lipid) within a sample (Poroyko et al 2011). However, relative concentrations of the same metabolite across food items and howler diets can be compared to determine their impact on howler nutrition and the gut microbiota. We standardized all diet data by metabolic body weight to control for age and sex differences in the composition of the howler groups. Fecal sample analysis: We stored fecal samples in 96% ethanol for microbial community composition analyses, 1M NaOH for VFA analyses, and 1M HCl for ammonia analyses. After collection, we shipped the samples to the University of Illinois where they were kept at -80C until processing. Permits to collect and export fecal and plant samples were obtained through the Secretaria del Medio Ambiente y Recursos Naturales (SEMARNAT), the Comision Nacional de 2 Areas Naturales Protegidas (CONANP), and the Secretaria de Agricultura, Ganaderia, Desarollo Rural, Pesca y Alimentacion (SAGARPA) in Mexico. Permits to import samples to the United States were obtained through the Center for Disease Control (CDC) and the Animal and Plant Health Inspection Service (APHIS). Permission to conduct this research was approved through the IACUC, University of Illinois (#12083). We amplified the intergenic spacer region of the 16S rRNA gene in all samples using polymerase chain reaction and used automated ribosomal intergenic spacer analysis (ARISA) to create a microbial “fingerprint” for each sample (Kent et al 2007). ARISA PCR products were visualized by denaturing capillary electrophoresis using an ABI 3730xl Genetic Analyzer (Applied Biosystems, Foster City, CA) at the UIUC Keck Center for Comparative and Functional Genomics, as described previously (Kent and Bayne 2010). Size-calling and ARISA profile alignment were carried out using GeneMarker version 1.95 (SoftGenetics, State College, PA). We used a signal detection threshold of 500 fluorescence units to exclude background fluorescence and normalized the signal strength (i.e., peak area) of each peak to account for runto-run variations in signal detection by dividing the area of individual peaks by the total fluorescence (area) detected in each profile (Yannarell and Triplett 2005). We used 454 FLX-Titanium technology at the J. Craig Venter Institute (Rockville, MD) for pyrosequencing of the V1-V3 region of the 16S ribosomal RNA gene to generate taxonomic data for the microbiota in a subset of samples (N=8 individuals at 15 time points)(Amato et al 2013). We successfully sequenced 119 samples. After we removed sequences shorter than 250nt, with homopolymers longer than 6 nucleotides, containing ambiguous base calls or incorrect primer sequences, there were 3,242.8 ± 1,610.5 reads per sample on average. We aligned sequences against the silva database (Pruesse et al 2007) and pre-clustered using mothur (Schloss 3 et al 2009). We detected and removed potentially chimeric sequences using mothur’s implementation of uchime (Schloss et al 2009) and assembled sequences using mothur’s average-neighbor algorithm. We defined OTUs as sharing > 97 % sequence identity. We produced rarefaction data, Shannon-Weaver and Chao1 indices using mothur (Schloss et al 2009) after rarefying data to 1,600 reads. We generated taxonomic profiles using the RDP Classifier (Wang et al 2007). Statistical analysis: For all analyses, data were pooled by individual for each sampling block, and only individuals from which data were collected during every sampling block were included in analyses (N=13). Because we detected differences across groups in most measured variables, we stratified PERMANOVA models by group, allowing us to test for differences across sampling blocks while controlling for differences among groups. We used Type III sums of squares to determine the significance of each factor in the model and ran all models for 5000 permutations. To ensure that the method by which we were dividing the data into three time periods was not creating artificial patterns, we also ran analyses on data for which samples from each individual were randomly pooled into three groups. Depending on the distribution of data, Kruskal-Wallis tests or analysis of variance (ANOVA) were used to test for seasonal patterns in total grams of food consumed, total fecal VFA content, and total fecal ammonia content. We also employed a series of Kruskal-Wallis tests to test for temporal patterns in intake of individual diet components, concentration of individual VFAs, and relative abundance of bacterial taxa. For correlations between plant metabolites and microbial OTUs, we tested for correlations using only those metabolites and OTUs that exhibited significant differences in relative consumption or relative abundance across 4 sampling periods. We adjusted p-values for repeated tests using a sequential Bonferroni correction with the initial p = 0.05 (Holm 1979, Rice 1989). However, to detect bacterial taxa that differed in abundance across sampling blocks, we used a p-value of 0.05 since sequencing restrictions reduced the number of individuals for which data were generated, and therefore reduced statistical power. We also used indicator species analysis (R Software, labdsv package) to detect microbial genera (pyrosequencing) characterizing each sampling block based on both abundance and frequency of occurrence (De Caceres and Legendre 2009). Taxa with a significant (p < 0.05) indicator value higher than 0.5 were considered characteristic of each sampling block 5 RESULTS Tables Table S1. Average nutrient and energy intake for each howler group across sampling periods based on literature estimates of food resource nutritional content, and average metabolite intake. Energy and nutrient intake values are expressed in grams per metabolic body weight, energy per metabolic body weight, and percent dry weight ingested. Metabolite values are expressed in relative concentration (compared to a standard) per metabolic body weight. WFD = Wet-Fruit Dominated Period, DLD = Dry-Leaf Dominated Period, DFD = Dry-Fruit Dominated Period WFD Motiepa Food consumed Available Protein (g/MBW) % Available Protein Total Non-Structural Carbohydrates (g/MBW) % Total Non-Structural Carbohydrates DLD Balam Motiepa DFD Balam Motiepa Balam Average 416.5 340.4 228.8 349.8 115.8 126.3 SD 101.2 68.6 85.8 72.1 36.0 54.0 Average 9.4 11.9 7.7 10.0 4.7 5.3 SD 3.3 3.2 2.6 3.0 1.0 1.8 Average 10.2% 11.3% 12.8% 11.5% 9.4% 9.4% SD 1.1% 0.9% 1.6% 0.6% 0.8% 0.8% Average 29.0 29.7 12.4 16.2 16.3 17.0 SD 12.5 12.0 3.5 3.7 3.4 5.0 Average 30.0% 27.2% 21.2% 18.9% 32.9% 32.6% SD 4.3% 6.6% 3.1% 3.2% 3.6% 10.4% Lipids Average 4.2 3.2 1.2 3.2 1.8 2.1 (g/MBW) SD 1.6 0.9 0.3 1.5 0.5 0.6 % Lipids Average 4.5% 3.1% 2.1% 3.5% 3.5% 3.7% SD 0.5% 0.3% 0.3% 0.5% 0.4% 0.1% Neutral Detergent Fiber Average 42.3 50.3 27.2 39.9 21.9 24.7 (g/MBW) SD 15.9 14.5 8.8 14.0 4.9 8.0 Total Energy (Kcal/MBW) Average 182.9 177.4 105.5 172.4 106.6 114.5 SD Amino Acid Metabolites Average Range Sugar Metabolites Average Range Lipid Metabolites Average Range 64.9 56.1 30.0 56.9 26.7 30.6 3,874,740 150,05413,677,598 7,655,871 192,07930,206,249 4,356,907 138,72215,353,681 4,971,969 505,80114,321,945 944,692 46,9685,857,965 1,952,207 18,47710,598,416 179,809,901 17,355,828646,243,338 106,698,939 5,413,802782,947,762 46,591,468 50,833,383160,876,872 44,597,474 30,250,67550,793,104 50,043,025 6,687,14629,075,974 96,710,217 3,539,931631,756,346 6,521,496 959,43613,868,615 4,173,832 800,97928,930,967 3,079,078 507,9877,645,966 2,637,125 416,3534,813,883 2,367,494 251,1755,618,803 1,534,664 102,872317,739 6 Table S2. Top ten plant species and parts consumed by each howler group during each sampling block reported in terms of percent of total grams of food ingested. Shannon diversity of plant species and parts consumed by each howler group during each sampling block is also included. WFD = Wet-Fruit Dominated Period, DLD = Dry-Leaf Dominated Period, DFD = Dry-Fruit Dominated Period Motiepa WFD Balam WFD Plant Species Plant Part Plant Species Plant Part Dendropanax arboreus Ripe Fruit 12.3 11.2 Brosimum alicastrum Ripe Fruit 24.2 15.9 Guatteria anomala Ficus americana Ripe Fruit Ripe/Unripe Fruit 9.6 10.1 Schizolobium parahyba Stem 14.7 10.6 9.1 4.1 Dendropanax arboreus Ripe Fruit 8.7 8.6 Ficus americana Ripe Fruit 8.3 5.4 Ficus yoponensis Ripe Fruit 8.0 4.0 Poulsenia armata Young Leaf 7.9 5.6 Guatteria anomala Ripe Fruit 6.0 7.5 Schizolobium parahyba Stem 4.4 6.0 Cojoba arborea Young Leaf 5.6 1.5 Ficus yoponensis Unripe Fruit 4.2 5.5 Brosimum alicastrum Unripe Fruit 3.9 2.9 Ficus insipida Ripe Fruit 3.5 3.9 Cojoba arborea Stem 3.7 3.5 Ficus aurea Ripe Fruit 2.5 3.0 Ficus yoponensis Young Leaf 2.7 1.1 Ficus pertusa Ripe Fruit 2.3 2.4 Ficus yoponensis Unripe Fruit 2.1 2.0 2.5 0.1 2.3 0.2 Shannon Diversity Avg % SD Motiepa DLD Plant Species Poulsenia armata Avg % SD Balam DLD Plant Part Young Leaf Avg % 19.5 SD Plant Species 10.6 Ficus yoponensis Plant Part Ripe Fruit Avg % SD 36.4 11.1 Schizolobium parahyba Stem 11.2 8.8 Schizolobium parahyba Stem 9.1 8.2 Brosimum alicastrum Unripe Fruit 10.9 5.7 Brosimum alicastrum Unripe Fruit 6.2 3.7 Ficus insipida Ripe Fruit 7.5 6.0 Poulsenia armata Young Leaf 6.1 3.7 Platymiscium dimorphandrum Young Leaf 4.2 4.6 Cojoba arborea Young Leaf 5.9 5.2 Brosimum alicastrum Ripe Fruit 3.4 9.0 Dialium guianense Flower 5.2 5.0 Poulsenia armata Unripe Fruit 3.3 4.2 Fabaceae sp. Young Leaf 4.2 4.6 Brosimum alicastrum Young Leaf 2.6 3.2 Platymiscium dimorphandrum Young Leaf 4.0 2.6 Fabaceae sp. Young Leaf 2.5 5.1 Ficus yoponensis Unripe Fruit 3.5 2.3 Ficus yoponensis Young Leaf 1.7 1.8 Brosimum alicastrum Young Leaf 2.2 2.5 2.0 0.2 2.2 0.3 Shannon Diversity Motiepa DFD Balam DFD Plant Species Plant Part Avg % Poulsenia armata Ripe Fruit 24.5 Ficus americana Ripe Fruit Ficus aurea Ampelocera hottlei SD Plant Species Plant Part Avg % SD 8.5 Poulsenia armata Ripe Fruit 23.2 17.3 15.1 5.2 Ficus yoponensis Ripe Fruit 14.1 8.5 Ripe Fruit 10.4 4.1 Ficus aurea Ripe Fruit 12.3 3.2 Ripe Fruit 8.2 6.6 Compsoneura sp. Ripe Fruit 9.8 7.4 Ficus yoponensis Ripe Fruit 7.2 6.6 Cojoba arborea Young Leaf 4.9 3.5 Poulsenia armata Young Leaf 6.7 3.3 Brosimum alicastrum Ripe Fruit 3.8 7.0 Brosimum alicastrum Unripe Fruit 1.6 2.1 Cojoba arborea Stem 2.9 2.8 Brosimum alicastrum Young Leaf 1.1 1.3 Poulsenia armata Young Leaf 2.7 1.9 Cojoba arborea Young Leaf 1.1 1.3 Ficus maxima Ripe Fruit 1.3 2.1 7 Ficus yoponensis Shannon Diversity Stem 0.9 1.6 2.2 0.2 Ficus aurea Unripe Fruit 1.2 1.6 2.3 0.4 8 Table S3. Relative abundances of bacterial families for each howler group across sampling periods. Values are expressed in percent of total sequences. Taxa highlighted in bold showed significant changes across sampling periods (p < 0.05). Analyses were performed on combined data for both howler groups. WFD = Wet-Fruit Dominated Period, DLD = Dry-Leaf Dominated Period, DFD = Dry-Fruit Dominated Period WFD DLD Balam Motiepa DFD Balam Motiepa AVG Balam SD AVG SD Motiepa Family AVG SD AVG SD AVG SD AVG SD Lachnospiraceae 32.577% 4.108% 39.526% 5.567% 30.807% 2.424% 33.991% 5.748% 22.295% 8.150% 27.831% 2.368% Ruminococcaceae 15.152% 0.719% 14.223% 1.450% 20.910% 5.691% 16.987% 6.127% 29.755% 9.678% 22.338% 4.414% Prevotellaceae 8.287% 3.450% 8.278% 4.841% 10.453% 7.860% 12.539% 5.686% 7.513% 3.277% 7.102% 3.397% Veillonellaceae 2.464% 3.061% 0.647% 0.423% 0.979% 0.649% 1.189% 0.488% 0.883% 0.434% 1.492% 0.748% Coriobacteriaceae 1.893% 0.753% 0.633% 0.261% 0.955% 0.384% 0.729% 0.350% 0.752% 0.204% 0.646% 0.190% Erysipelotrichaceae 1.743% 0.739% 1.747% 0.325% 0.435% 0.222% 0.362% 0.107% 0.774% 0.485% 1.642% 1.154% Verrucomicrobiaceae 1.434% 1.655% 0.192% 0.232% 0.146% 0.278% 0.064% 0.040% 0.215% 0.251% 0.255% 0.203% Incertae Sedis XIII 0.603% 0.443% 0.160% 0.098% 0.157% 0.048% 0.318% 0.245% 0.098% 0.044% 0.104% 0.155% Synergistaceae 0.477% 0.406% 0.331% 0.403% 0.109% 0.091% 0.119% 0.160% 0.099% 0.052% 0.165% 0.103% Incertae Sedis XIV 0.343% 0.155% 0.426% 0.165% 0.378% 0.197% 0.361% 0.045% 0.355% 0.197% 0.584% 0.195% Desulfovibrionaceae 0.196% 0.218% 0.161% 0.176% 0.122% 0.029% 0.190% 0.178% 0.095% 0.110% 0.208% 0.171% Porphyromonadaceae 0.174% 0.143% 0.147% 0.156% 0.210% 0.126% 0.362% 0.453% 0.211% 0.217% 0.669% 1.034% Chloroplast 0.158% 0.199% 0.055% 0.049% 0.070% 0.031% 0.127% 0.113% 0.036% 0.052% 0.027% 0.013% Streptococcaceae 0.067% 0.029% 0.156% 0.112% 0.022% 0.018% 0.043% 0.034% 0.011% 0.009% 0.015% 0.010% Spirochaetaceae 0.060% 0.120% 0.000% 0.000% 0.020% 0.039% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Sphingomonadaceae 0.046% 0.088% 0.004% 0.005% 0.003% 0.004% 0.010% 0.009% 0.002% 0.004% 0.004% 0.006% Brachyspiraceae 0.035% 0.012% 0.022% 0.008% 0.020% 0.006% 0.019% 0.009% 0.023% 0.003% 0.029% 0.010% Oxalobacteraceae 0.022% 0.020% 0.000% 0.000% 0.019% 0.021% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Anaeroplasmataceae 0.022% 0.022% 0.091% 0.058% 0.009% 0.014% 0.011% 0.013% 0.028% 0.015% 0.037% 0.031% Enterococcaceae 0.012% 0.017% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.009% 0.010% 0.000% 0.000% Hyphomicrobiaceae 0.012% 0.012% 0.021% 0.032% 0.004% 0.005% 0.006% 0.009% 0.000% 0.000% 0.004% 0.005% Planctomycetaceae 0.009% 0.018% 0.007% 0.009% 0.006% 0.002% 0.002% 0.004% 0.004% 0.004% 0.001% 0.003% Clostridiaceae 0.008% 0.016% 0.059% 0.068% 0.054% 0.061% 0.037% 0.053% 0.031% 0.053% 0.027% 0.013% Opitutaceae 0.008% 0.006% 0.054% 0.045% 0.015% 0.026% 0.050% 0.054% 0.016% 0.011% 0.203% 0.169% Neisseriaceae 0.008% 0.015% 0.039% 0.061% 0.000% 0.000% 0.023% 0.023% 0.003% 0.007% 0.016% 0.015% Enterobacteriaceae 0.006% 0.012% 0.060% 0.025% 0.035% 0.049% 0.110% 0.070% 0.001% 0.002% 0.059% 0.025% Nocardioidaceae 0.006% 0.011% 0.000% 0.000% 0.000% 0.000% 0.002% 0.003% 0.000% 0.000% 0.003% 0.003% Bradyrhizobiaceae 0.005% 0.006% 0.003% 0.005% 0.006% 0.008% 0.003% 0.004% 0.000% 0.000% 0.006% 0.011% Phyllobacteriaceae 0.004% 0.005% 0.011% 0.013% 0.004% 0.008% 0.000% 0.000% 0.000% 0.000% 0.006% 0.012% Flavobacteriaceae 0.004% 0.005% 0.000% 0.000% 0.004% 0.009% 0.004% 0.005% 0.001% 0.002% 0.000% 0.000% Mycobacteriaceae 0.004% 0.007% 0.004% 0.008% 0.002% 0.004% 0.004% 0.005% 0.000% 0.000% 0.001% 0.002% Alcaligenaceae 0.003% 0.006% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Pseudomonadaceae 0.002% 0.005% 0.006% 0.007% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% Comamonadaceae 0.002% 0.004% 0.002% 0.003% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.001% 0.002% 9 Helicobacteraceae 0.002% 0.004% 0.004% 0.008% 0.002% 0.004% 0.005% 0.006% 0.005% 0.007% 0.004% 0.003% Pseudonocardiaceae 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Sphingobacteriaceae 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% Thiotrichaceae 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.003% 0.004% 0.000% 0.000% 0.000% 0.000% Bacteroidaceae 0.002% 0.003% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.001% 0.002% 0.006% 0.012% Leuconostocaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.006% 0.011% 0.000% 0.000% Bacillaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% Actinomycetaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.003% 0.003% 0.005% Intrasporangiaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% Micromonosporaceae 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.004% 0.004% 0.001% 0.002% 0.000% 0.000% Nocardiaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% Acidimicrobidae 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.002% 0.004% Anaerolineaceae 0.000% 0.000% 0.000% 0.000% 0.001% 0.003% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% Caulobacteraceae 0.000% 0.000% 0.002% 0.004% 0.002% 0.004% 0.004% 0.004% 0.000% 0.000% 0.007% 0.014% Chitinophagaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.001% 0.003% Conexibacteraceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% Corynebacteriaceae 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Cystobacteraceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Erythrobacteraceae 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% Gemmatimonadaceae 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Incertae Sedis XI 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.020% 0.039% 0.000% 0.000% 0.001% 0.003% Kineosporiaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% Kofleriaceae 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Microbacteriaceae 0.000% 0.000% 0.004% 0.005% 0.000% 0.000% 0.004% 0.007% 0.000% 0.000% 0.002% 0.002% Nitrospiraceae 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Propionibacteriaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Puniceicoccaceae 0.000% 0.000% 0.000% 0.000% 0.001% 0.001% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Rhizobiaceae 0.000% 0.000% 0.002% 0.005% 0.006% 0.007% 0.001% 0.002% 0.000% 0.000% 0.008% 0.009% Rhodobacteraceae 0.000% 0.000% 0.005% 0.006% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Rubrobacteraceae 0.000% 0.000% 0.003% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Sinobacteraceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.005% 0.010% Streptomycetaceae 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Streptosporangiaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.016% 0.026% Syntrophomonadaceae 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.003% Victivallaceae 0.000% 0.000% 0.016% 0.021% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Xanthomonadaceae 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 10 Table S4. Relative abundances of bacterial genera for each howler group across sampling periods. Values are expressed in percent of total sequences. Taxa highlighted in bold showed significant changes across sampling periods (p < 0.05). Analyses were performed on combined data for both howler groups. **again it might be helpful to the reader to define WFD, DLD, and DFD in the table** WFD Balam DLD Motiepa Balam DFD Motiepa Balam Motiepa Genus AVG SD AVG SD AVG SD AVG SD AVG SD AVG SD Oscillibacter 2.847% 2.154% 1.427% 0.272% 2.282% 1.829% 0.838% 0.226% 0.634% 0.356% 0.827% 0.283% Succiniclasticum 1.703% 3.047% 0.242% 0.459% 0.183% 0.148% 0.334% 0.482% 0.042% 0.029% 0.100% 0.180% Prevotella 1.608% 1.458% 1.680% 1.184% 4.605% 5.733% 2.682% 3.331% 2.098% 2.672% 1.928% 1.480% Akkermansia 1.434% 1.655% 0.192% 0.232% 0.146% 0.278% 0.064% 0.040% 0.229% 0.264% 0.252% 0.201% Hallella 1.356% 1.189% 1.741% 0.641% 0.743% 0.513% 6.294% 5.168% 1.352% 1.257% 2.589% 1.640% Coprobacillus 1.058% 0.720% 1.085% 0.324% 0.192% 0.106% 0.124% 0.081% 0.421% 0.247% 1.168% 0.996% Subdoligranulum 0.874% 0.372% 0.529% 0.202% 0.439% 0.198% 0.552% 0.133% 0.734% 0.349% 0.813% 0.394% Faecalibacterium 0.808% 0.739% 1.247% 0.430% 0.318% 0.155% 1.543% 1.728% 1.119% 1.231% 1.837% 1.222% Xylanibacter 0.734% 0.732% 0.272% 0.256% 0.327% 0.294% 0.189% 0.243% 0.206% 0.204% 0.134% 0.184% Marvinbryantia 0.582% 0.271% 0.725% 0.232% 0.668% 0.079% 0.903% 0.447% 0.457% 0.182% 0.711% 0.257% TM7 0.392% 0.500% 0.015% 0.019% 0.181% 0.215% 0.070% 0.058% 0.440% 0.414% 0.238% 0.150% Roseburia 0.371% 0.141% 0.998% 0.821% 0.751% 0.361% 0.584% 0.500% 0.386% 0.355% 0.415% 0.182% Mogibacterium 0.364% 0.251% 0.110% 0.109% 0.105% 0.048% 0.140% 0.194% 0.053% 0.024% 0.076% 0.125% Blautia 0.320% 0.165% 0.416% 0.174% 0.347% 0.194% 0.456% 0.290% 0.330% 0.196% 0.573% 0.193% Butyricicoccus 0.295% 0.122% 0.254% 0.103% 0.447% 0.172% 0.395% 0.049% 0.252% 0.075% 0.207% 0.085% Ruminococcus 0.263% 0.099% 0.117% 0.074% 0.090% 0.033% 0.085% 0.042% 0.357% 0.468% 0.091% 0.033% Coprococcus 0.222% 0.089% 0.718% 0.436% 0.522% 0.127% 0.332% 0.259% 0.452% 0.388% 0.942% 0.657% Papillibacter 0.173% 0.079% 0.259% 0.169% 0.446% 0.112% 0.549% 0.584% 0.859% 0.106% 0.608% 0.094% Atopobium 0.162% 0.042% 0.091% 0.017% 0.078% 0.070% 0.095% 0.055% 0.138% 0.067% 0.139% 0.077% Streptophyta 0.158% 0.199% 0.055% 0.049% 0.070% 0.031% 0.125% 0.114% 0.036% 0.052% 0.027% 0.013% Gordonibacter 0.151% 0.133% 0.028% 0.008% 0.067% 0.045% 0.027% 0.018% 0.023% 0.024% 0.032% 0.018% Desulfovibrio 0.128% 0.189% 0.074% 0.130% 0.029% 0.020% 0.121% 0.175% 0.066% 0.120% 0.166% 0.161% Anaerovorax 0.117% 0.084% 0.034% 0.031% 0.029% 0.012% 0.059% 0.032% 0.022% 0.021% 0.016% 0.008% Treponema 0.105% 0.210% 0.000% 0.000% 0.011% 0.022% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Solobacterium 0.066% 0.053% 0.125% 0.090% 0.030% 0.013% 0.073% 0.042% 0.184% 0.135% 0.105% 0.025% Streptococcus 0.065% 0.032% 0.156% 0.112% 0.017% 0.016% 0.043% 0.034% 0.007% 0.006% 0.015% 0.010% Collinsella 0.055% 0.026% 0.027% 0.014% 0.031% 0.023% 0.048% 0.043% 0.039% 0.014% 0.023% 0.016% Moryella 0.053% 0.017% 0.147% 0.051% 0.107% 0.064% 0.042% 0.016% 0.022% 0.018% 0.062% 0.020% Helicobacter 0.044% 0.088% 0.004% 0.008% 0.001% 0.002% 0.005% 0.006% 0.005% 0.007% 0.124% 0.237% Anaerotruncus 0.044% 0.047% 0.008% 0.009% 0.085% 0.134% 0.050% 0.024% 0.039% 0.022% 0.016% 0.008% Brachyspira 0.033% 0.012% 0.022% 0.008% 0.020% 0.006% 0.019% 0.009% 0.023% 0.003% 0.029% 0.010% Butyrivibrio 0.031% 0.022% 0.028% 0.010% 0.022% 0.018% 0.024% 0.014% 0.018% 0.004% 0.018% 0.013% Barnesiella 0.023% 0.020% 0.020% 0.039% 0.017% 0.022% 0.059% 0.118% 0.012% 0.012% 0.035% 0.061% 11 Howardella 0.023% 0.017% 0.009% 0.013% 0.031% 0.009% 0.025% 0.019% 0.025% 0.005% 0.011% 0.005% Oxalobacter 0.022% 0.020% 0.000% 0.000% 0.019% 0.021% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Anaerostipes 0.021% 0.013% 0.025% 0.015% 0.049% 0.066% 0.022% 0.034% 0.026% 0.012% 0.013% 0.013% Syntrophococcus 0.019% 0.011% 0.011% 0.009% 0.017% 0.017% 0.007% 0.012% 0.007% 0.003% 0.007% 0.006% Oribacterium 0.019% 0.013% 0.007% 0.005% 0.004% 0.005% 0.004% 0.009% 0.002% 0.004% 0.001% 0.003% Dorea 0.018% 0.023% 0.033% 0.016% 0.009% 0.014% 0.018% 0.013% 0.007% 0.005% 0.011% 0.015% Anaeroplasma 0.018% 0.019% 0.058% 0.020% 0.022% 0.029% 0.008% 0.012% 0.025% 0.014% 0.033% 0.028% Acetivibrio 0.016% 0.015% 0.010% 0.010% 0.011% 0.005% 0.002% 0.003% 0.001% 0.003% 0.000% 0.000% Parabacteroides 0.013% 0.010% 0.000% 0.000% 0.029% 0.008% 0.004% 0.004% 0.016% 0.014% 0.011% 0.009% Enterococcus 0.012% 0.017% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.009% 0.010% 0.000% 0.000% Cryptobacterium 0.012% 0.013% 0.005% 0.006% 0.024% 0.005% 0.014% 0.009% 0.018% 0.013% 0.011% 0.013% Eggerthella 0.012% 0.008% 0.007% 0.005% 0.012% 0.006% 0.009% 0.011% 0.012% 0.008% 0.004% 0.005% Dialister 0.008% 0.010% 0.004% 0.005% 0.001% 0.003% 0.011% 0.004% 0.007% 0.003% 0.313% 0.593% Sarcina 0.008% 0.016% 0.059% 0.068% 0.053% 0.040% 0.036% 0.051% 0.029% 0.049% 0.025% 0.009% Robinsoniella 0.005% 0.006% 0.007% 0.014% 0.002% 0.003% 0.004% 0.003% 0.003% 0.004% 0.003% 0.003% Gp6 0.005% 0.006% 0.002% 0.004% 0.007% 0.003% 0.004% 0.004% 0.002% 0.004% 0.004% 0.008% Brevundimonas 0.005% 0.010% 0.002% 0.004% 0.002% 0.004% 0.002% 0.004% 0.000% 0.000% 0.005% 0.010% Devosia 0.004% 0.005% 0.002% 0.004% 0.000% 0.000% 0.005% 0.009% 0.000% 0.000% 0.000% 0.000% Cloacibacterium 0.004% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Asteroleplasma 0.004% 0.008% 0.032% 0.044% 0.002% 0.004% 0.003% 0.004% 0.004% 0.004% 0.004% 0.003% Mycobacterium 0.004% 0.007% 0.004% 0.008% 0.002% 0.004% 0.004% 0.005% 0.000% 0.000% 0.001% 0.002% Spartobacteria 0.004% 0.007% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Schlesneria 0.003% 0.006% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Veillonella 0.003% 0.006% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Marmoricola 0.003% 0.006% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Escherichia/Shigella 0.003% 0.006% 0.055% 0.022% 0.022% 0.040% 0.108% 0.070% 0.000% 0.000% 0.057% 0.026% Aeromicrobium 0.002% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Bradyrhizobium 0.002% 0.005% 0.000% 0.000% 0.006% 0.008% 0.001% 0.002% 0.000% 0.000% 0.003% 0.005% Acetitomaculum 0.002% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Pseudomonas 0.002% 0.005% 0.004% 0.004% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% Paraprevotella 0.002% 0.005% 0.003% 0.006% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Olsenella 0.002% 0.005% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.002% 0.004% 0.000% 0.000% Hespellia 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Opitutus 0.002% 0.004% 0.002% 0.004% 0.030% 0.060% 0.007% 0.011% 0.002% 0.002% 0.020% 0.011% Pirellula 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% Aminobacter 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Beggiatoa 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.003% 0.004% 0.000% 0.000% 0.000% 0.000% Blastochloris 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Hyphomicrobium 0.002% 0.004% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Pedomicrobium 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Pseudonocardia 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Sphingobacterium 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Bacteroides 0.002% 0.003% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.001% 0.002% 0.006% 0.012% 12 Acetanaerobacterium 0.002% 0.003% 0.000% 0.000% 0.005% 0.006% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Catonella 0.002% 0.003% 0.000% 0.000% 0.002% 0.003% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Gp3 0.002% 0.003% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Lactococcus 0.002% 0.003% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Sandaracinobacter 0.002% 0.003% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Weissella 0.000% 0.000% 0.003% 0.006% 0.000% 0.000% 0.000% 0.000% 0.006% 0.011% 0.000% 0.000% Corynebacterium 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.004% 0.009% 0.000% 0.000% Synergistes 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.004% 0.007% 0.000% 0.000% Slackia 0.000% 0.000% 0.003% 0.006% 0.002% 0.004% 0.002% 0.004% 0.002% 0.004% 0.001% 0.002% Bacillus 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% Pseudobutyrivibrio 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% Mobiluncus 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.003% 0.000% 0.000% Flavobacterium 0.000% 0.000% 0.000% 0.000% 0.004% 0.009% 0.004% 0.004% 0.001% 0.002% 0.000% 0.000% Gordonia 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.009% 0.014% 0.001% 0.002% 0.000% 0.000% Anaerosporobacter 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.002% 0.004% Acidovorax 0.000% 0.000% 0.002% 0.003% 0.000% 0.000% 0.007% 0.013% 0.000% 0.000% 0.000% 0.000% Actinomyces 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.003% 0.005% Allobaculum 0.000% 0.000% 0.005% 0.010% 0.000% 0.000% 0.016% 0.032% 0.000% 0.000% 0.031% 0.063% Arthrobacter 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Asaccharobacter 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% Asticcacaulis 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Balneimonas 0.000% 0.000% 0.003% 0.005% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% Chryseobacterium 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% Conexibacter 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% Enterobacter 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Erwinia 0.000% 0.000% 0.000% 0.000% 0.001% 0.001% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Filomicrobium 0.000% 0.000% 0.003% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Gemmatimonas 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Gp1 0.000% 0.000% 0.004% 0.009% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Gp4 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Ilumatobacter 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.002% 0.004% Kofleria 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Leucobacter 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% Luteolibacter 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.003% 0.004% Mesorhizobium 0.000% 0.000% 0.003% 0.005% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Microbacterium 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.004% 0.007% 0.000% 0.000% 0.000% 0.000% Nitrospira 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Nocardioides 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.003% 0.003% Novosphingobium 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.003% 0.004% Parasporobacterium 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% Pelospora 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.003% Phyllobacterium 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Porphyrobacter 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 13 Prosthecomicrobium 0.000% 0.000% 0.003% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Rhizobium 0.000% 0.000% 0.002% 0.005% 0.028% 0.049% 0.000% 0.000% 0.000% 0.000% 0.008% 0.009% Rhodoplanes 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% Rubrobacter 0.000% 0.000% 0.003% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Serratia 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Shuttleworthia 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.002% 0.004% Sphingomonas 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% Steroidobacter 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.005% 0.010% Streptomyces 0.000% 0.000% 0.000% 0.000% 0.001% 0.002% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Subdivision 3 0.000% 0.000% 0.000% 0.000% 0.001% 0.001% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Tannerella 0.000% 0.000% 0.000% 0.000% 0.003% 0.005% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Terrimonas 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.001% 0.003% Victivallis 0.000% 0.000% 0.013% 0.016% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% Xanthomonas 0.000% 0.000% 0.002% 0.004% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 0.000% 14 Table S5. Spearman’s ρ values for significant correlations (p < 0.05) between microbial taxa and amounts of different diet components consumed. NDF = Neutral Detergent Fiber, TNC = Total Non-structural Carbohydrates Taxon Acetivibrio Kcal 0.70 Protein Lipid 0.75 0.69 NDF 0.75 Butyricicoccus TNC Young Leaf 0.61 Unripe Fruit Stem 0.58 0.54 Coprobacillus 0.57 0.53 Dialister -0.53 Hallella 0.57 -0.60 -0.55 Mogibacterium Incertae Sedis XIII Mature Leaf 0.55 0.64 Oscillibacter -0.60 0.72 0.56 Streptococcus Streptophyta 0.59 0.68 15 0.99 1-Methyl-beta-D-galactopyranoside 0.68 1-Octedecenoylglycerol 0.68 0.76 0.72 0.78 0.66 0.71 0.78 0.8 0.74 0.75 0.67 0.67 24-Methylenecycloartanol 2-Methylcitric acid 0.75 0.74 0.7 0.73 2-Methylglutamic acid 0.69 0.72 0.7 0.68 2-Methylmalic acid 0.76 0.72 0.73 0.75 0.71 0.74 2-methylsuccinic acid 0.73 0.65 0.66 0.68 0.79 0.69 0.68 0.67 2-Piperidinecarboxylic acid 3,4-Dihydroxybutanoic acid 0.71 0.84 0.8 3,4-Dimethoxycinnamic acid 0.71 0.7 0.7 3-Deoxy-arabino-hexaric acid 0.72 0.82 0.79 3-methyl-2-hydroxypentanoic acid 0.69 0.71 0.74 -0.69 0.73 0.69 -0.68 0.67 3,4,5-Trihydroxypentanoic acid 0.68 4,5-dimethyl-2,6-dihydroxypyrimidine 0.69 0.69 0.68 0.68 0.67 0.7 0.67 -0.68 0.66 0.69 0.67 4-Hydroxy-3-methoxyphenethyleneglycol 0.7 0.69 4-Hydroxyproline 0.66 0.68 Adenine 0.68 0.68 0.7 0.66 0.68 0.66 0.74 C16:1 Eicosanol Xylanibacter 0.67 2,3-dihydroxysuccinic acid Diethyleneglycol TM7 0.66 2-hydroxyglutaric acid Aspartic acid Streptophyta 0.99 1,6-Anhydroglucose 4-Caffeoylquinic acid Solobacterium 0.88 1-Methyl-alpha-D-glucopyranoside 2,3-Dihydroxybutanedioic acid Prevotella Papillibacter 0.89 Oscillibacter Dialister 0.66 Oribacterium Coprobacillus 0.68 Hallella Butyricicoccus 0.95 Gordonibacter Akkermanisia 1-hexadecanoylglycerol Acetivibrio Metabolite Ruminococcaeeae Table S6. R values for significant correlations (p < 0.05) between microbial taxa and relative concentration of diet metabolites. -0.77 0.72 0.74 0.66 0.75 -0.77 -0.75 0.76 0.67 16 Ethanol, (2-(3,4-dihydroxyphenyl)- 0.66 Erythritol 0.65 Ferulic acid 0.69 0.79 0.74 0.67 Gallic acid 0.78 0.67 0.76 0.74 0.68 Glucaric acid 0.73 0.68 0.66 0.74 0.7 0.65 0.65 0.69 Glycolic acid 0.67 0.68 0.66 Guanine 0.73 0.77 0.74 0.72 Hentriacontanol 0.81 0.67 0.65 0.75 0.7 0.74 Heptacosanol 0.75 0.71 0.67 0.71 0.68 0.7 0.75 0.76 0.77 0.74 Glucuronic acid 0.66 0.7 -0.72 0.72 -0.67 0.7 Hexacosanoic acid 0.73 Isoleucine 0.74 Kaempferol Lactic Acid 0.73 0.75 0.75 0.73 N-Acetyl glucosamine 0.7 0.75 0.68 0.69 N-Acetylglucosylamine 0.72 0.7 0.69 -0.67 0.75 0.66 -0.67 0.71 0.72 0.78 Octacosanol 0.67 0.66 -0.7 0.7 Quinic acid 0.65 0.67 0.67 0.71 0.73 0.71 0.67 0.73 Shikimic acid 0.67 Sorbitol Tocopherol-a 0.71 0.7 Nicotinic acid Ribose 0.72 0.68 Monomethylphosphate Protocatechuic acid 0.73 -0.67 Leucine p-hydroxyCoumaric acid -0.69 0.72 0.75 0.67 0.7 0.67 0.67 0.74 0.81 0.8 0.7 0.71 0.7 0.68 Uridine Xylitol 0.69 -0.67 17 Table S7. Fecal concentrations (mM) of volatile fatty acids and ammonia for each howler group across sampling periods. *Indicates significant changes across time (p < 0.05). VFA = Volatile Fatty Acid Sampling Block WFD DLD DFD Group Acetic* Propanoic Butanoic* Pentanoic Isobutanoic Isopentanoic* Total VFAs* Ammonia* Average SD Average SD Average SD Average SD Average SD Average SD Average SD Average SD Balam 43.0 8.2 3.4 1.1 1.9 1.0 0.3 0.1 0.2 0.1 0.2 0.1 49.0 10.3 9.6 4.0 Motiepa 36.9 4.8 3.0 0.5 1.8 0.5 0.3 0.1 0.2 0.1 0.2 0.1 42.4 4.9 11.0 7.8 Balam 33.0 2.1 3.6 0.4 2.4 0.4 0.4 0.2 0.1 0.0 0.1 0.0 39.7 2.4 3.9 0.8 Motiepa 36.1 2.8 3.7 0.3 2.8 0.6 0.4 0.1 0.1 0.0 0.1 0.1 43.2 3.2 4.2 1.0 Balam 46.5 3.0 3.7 0.5 1.7 0.2 0.3 0.1 0.1 0.0 0.2 0.1 52.5 3.1 4.2 0.9 Motiepa 48.4 4.5 4.0 0.7 2.1 0.3 0.4 0.1 0.1 0.0 0.2 0.0 55.2 5.4 4.0 0.9 18 Table S8. Spearman’s ρ values for significant correlations (p < 0.05) between individual diet components and fecal VFA and ammonia concentration. NDF = Neutral Detergent Fiber, TNC = Total Non-structural Carbohydrates Microbial Product Acetic Acid Butanoic Acid Isobutanoic Acid Isopentanoic Acid Ammonia Unripe Fruit -0.58 Young Leaves -0.65 0.43 Mature Leaves 0.50 Protein -0.51 TNC NDF 0.46 -0.42 0.43 0.51 0.50 19 Table S9. Spearman’s ρ values for significant correlations (p < 0.05) between the relative concentration of ingested metabolites and fecal volatile fatty acid and ammonia concentration. Metabolite Acetic Butanoic 1,2,3-trihydroxybenzene 1,2,3-trihydroxybutane 0.79 -0.21 1,6-Anhydroglucose 1-Methyl-beta-D-galactopyranoside 0.7 -0.71 1-Octedecenoylglycerol 2,3-Dihydroxybutanedioic acid Ammonia 0.65 -0.67 2,3-dihydroxysuccinic acid 0.66 2,4,5-Trihydroxypentanoic acid 0.55 2,5-dihydroxybenzoic acid 0.56 2,4-Methylenecycloartanol 0.57 2-Methylcitric acid 0.56 2-Methylmalic acid 0.76 2-Oxoisocaproic acid 0.61 2-Piperidinecarboxylic acid -0.71 3,4,5-Trihydroxypentanoic acid 0.73 3,4-Dimethoxycinnamic acid 0.63 3-Deoxy-arabino-hexaric acid 0.63 3-hydroxybenzoic acid 0.57 3-methyl-2-hydroxypentanoic acid 0.63 3-methyl-2-oxobutanoic acid 0.65 4-Caffeoylquinic acid -0.7 4-Hydroxy-3-methoxyphenethyleneglycol 0.65 4-Hydroxyproline -0.55 Allantoin -0.62 0.55 beta-Amyrin 0.62 C16:1 0.62 C18:1 0.69 chlorogenic acid Citric acid -0.71 0.61 Diethyleneglycol 0.53 Erythronic acid 0.63 Ethanol, (2-(3,4-dihydroxyphenyl)galacturonic acid 0.6 -0.63 gallic acid 0.59 Glucaric acid 0.64 glucuronic acid 0.62 Hentriacontanol 0.71 Inositol, myo- 0.56 Itaconic acid 0.64 20 Kaempferol 0.62 Mannitol N-Acetylglucosylamine 0.55 -0.36 N-Acetyl glucosamine neochlorogenic acid 0.55 -0.73 Nonacosanol 0.58 Octacosanol 0.71 p-hydroxybenzaldehyde 0.59 Protocatechuic acid 0.63 Shikimic acid Sorbitol 0.59 -0.63 Thymine 0.58 Vanillic acid 0.67 Xylopyranoside 0.56 Xylose 0.57 21 Table S10. Spearman’s ρ values for significant correlations (p < 0.05) between microbial taxa and fecal volatile fatty acid and ammonia concentration. Taxon Anaeroplasmataceae Acetic Acid Isobutanoic Acid Isopentanoic Acid Ammonia 0.55 Erysipeltotrichaceae 0.53 Streptococcaceae 0.61 Acetivibrio 0.56 Butyricicoccus -0.61 Coprobacillus 0.54 0.54 Oscillibacter 0.53 Streptococcus 0.63 Streptophyta Xylanibacter -0.61 0.53 22 Table S11. Spearman’s ρ values for significant correlations (p < 0.05) between howler activity and diet components and between howler activity and average daily maximum temperature over the entire study period. NDF = Neutral Detergent Fiber, TNC = Total Non-structural Carbohydrates Energy (kcal/MBW) Protein (g/MBW) NDF (g/MBW) Resting -0.5 -0.67 -0.68 Feeding 0.76 0.71 0.87 TNC (g/MBW) Lipids (g/MBW) Max Temp (°C) 0.87 0.54 0.64 -0.89 23 Table S12. Volatile fatty acid concentrations and profiles in nonhuman primates and mammals. Table modified from Lambert (2012). WILD Total VFA Concentration (mM) % Acetate % Butyrate %Propionate Source Procolobus verus 230 Ohwaki et al. 1974 Colobus guereza 107–434 Ohwaki et al. 1974 Cercopithecus aethiops 190–229 Brourton et al. 1991 Cercopithecus mitis 122–199 Brourton et al. 1991 138–180 Clemens and Phillips 1980 Papio cynocephalus 95–170 Pan troglodytes 44 Alouatta palliata Alouatta pigra 40-55 Homo sapiens 100 Clemens and Phillips 1980 31 10 3 Ushida et al. 2006 94 6 0.4 Milton and McBee 1983 83-89 3-7 7-9 this study 57 22 21 Cummings 1987 CAPTIVE Trachypithecus cristatus 95–133 47–56 24–26 10–18 Bauchop and Martucci 1968 Semnopithecus entellus 89–233 46–50 22–23 14–23 Bauchop and Martucci 1968 Colobus guereza 53–65 Colobus guereza 79 61 23 10 Lambert and Fellner 2012 Cercopithecus neglectus 65 47 21 26 Lambert and Fellner 2012 Papio hamadryas 87 48 36 11 Lambert and Fellner 2012 Pan troglodytes 81 55 25 12 Lambert and Fellner 2012 Gorilla gorilla 89 58 25 11 Lambert and Fellner 2012 Pongo abelii 62-67 22-27 10-14 Bos taurus 96–210 48–74 14–28 7–18 van Soest 1994 Ovis aries 70–140 40–66 19–40 9–15 Blaxter et al. 1956 Kay et al. 1976 Schmidt et al. 2005 24 Figures Figure S1. Partial correspondence analysis illustrating patterns in the grams of plant parts consumed by the howlers each season with the effect of individual removed. Each point represents the average diet of one individual during each sampling period. PERMANOVA results indicate that 54% of the variation is explained by sampling period. WFD = Wet-Fruit Dominated Period, DLD = Dry-Leaf Dominated Period, DFD = Dry-Fruit Dominated Period 25 Figure S2. Partial correspondence analysis illustrating patterns in the grams of plant parts from each plant species consumed by the howlers each season with the effect of individual removed. Each point represents the average diet of one individual during a sampling period. PERMANOVA results indicate that 38% of the variance is explained by sampling period. WFD = Wet-Fruit Dominated Period, DLD = Dry-Leaf Dominated Period, DFD = Dry-Fruit Dominated Period WFD= wet fruit dominated season, DLD= , DFD = ------ 26 Figure S3. Partial correspondence analysis illustrating patterns in the plant metabolites consumed by the howlers each season with the effect of individual removed. Each point represents the average diet of one individual during a sampling period. PERMANOVA results indicate that 36% of the variance is explained by sampling period. WFD = Wet-Fruit Dominated Period, DLD = Dry-Leaf Dominated Period, DFD = Dry-Fruit Dominated Period 27 Figure S4. Partial correspondence analysis illustrating patterns in gut microbial community composition across sampling periods at the (A) Family and (B) genus level with the effect of individual removed. Each point represents the average gut microbiota of one individual during a sampling period. PERMANOVA results indicate that 29% of the variance is explained by sampling block at the Family level and 13% at the genus level. WFD = Wet-Fruit Dominated Period, DLD = Dry-Leaf Dominated Period, DFD = Dry-Fruit Dominated Period 28 Figure S5. Network diagram illustrating significant correlations (p < 0.05) between quantity of diet components ingested (green nodes: plant metabolites, plant parts, macronutrients), relative abundances of bacterial taxa (teal nodes), and fecal concentrations of microbial products (magenta nodes: volatile fatty acids, ammonia). Edge lengths are proportional to the magnitude of each correlation (Spearman’s ρ). 29 Figure S6. Partial correspondence analysis illustrating patterns in the millimoles of volatile fatty acids excreted by the howlers each season with the effect of individual removed. Each point represents the average VFA profile of one individual during a sampling block. PERMANOVA results indicate that 36% of the variance is explained by sampling block. 30 REFERENCES Amato KR, Yeoman CJ, Kent A, Carbonero F, Righini N, Estrada AE et al (2013). Habitat degradation impacts primate gastrointestinal microbiomes. ISME J 7: 1344-1353. Amato KR, Garber PA (2014). Nutrition and foraging strategies of the black howler monkey (Alouatta pigra) in Palenque National Park, Mexico. Am J Primatol 76. De Caceres M, Legendre P (2009). Associations between species and groups of sites: Indices and stastical inference. Ecol 90: 3566-3574. Holm S (1979). A simple sequentially rejective multiple test procedure. Scand J Stat 6: 65-70. Kent AD, Yannarell AC, Rusak JA, Triplett EW, McMahon KD (2007). Synchrony in aquatic microbial community dynamics. ISME J 1: 38-47. Kent AD, Bayne ZL (2010). Degraded water quality influences microbial community composition and perception of health risks in the Chattooga River. DNA Cell Biol 29: 509-517. Lambert JE, Fellner V (2012). In vitro fermentation of dietary carbohydrate consumed by african apes and monkeys: preliminary results for interpreting microbial and digestive strategy. Int J Primatol 33: 263-281. Poroyko V, Morowitz M, Bell T, Ulanov A, Wang M, Donovan S et al (2011). Diet creates metabolic niches in the "inmature gut" that shape microbial communities. Nutricion Hospitalaria 26: 1283-1295. Pruesse EC, Quast C, Knittel K, Fuchs BM, Ludwig W, Peplies J et al (2007). SILVA: A comprehensive online resource for quality checked and aligned ribosomal RNA sequence data compatible with ARB. Nucleic Acids Res 35: 7188-7196. Rice WR (1989). Analyzing tables of statistical tests. Evol 43: 223-225. Schloss PD, Westcott SL, Ryabin T, Hall JR, Hartmann M, Hollister EB et al (2009). Introducing mothur: Open-source, platform-independent, community-supported software for describing and comparing microbial communities. Appl Environ Microbiol 75: 7537-7541. Wang Q, Garrity GM, Tiedje JM, Cole JR (2007). Naive Bayesian Classifier for rapid assignment of rRNA sequences into the new bacterial taxonomy. Appl Environ Microbiol 73: 5261-5267. Yannarell AC, Triplett EW (2005). Geographic and environmental sources of variation in lake bacterial community composition. Appl Environ Microbiol 71: 227-239. 31