Plant-animal interactions • • • • Co-evolution? Herbivory Plant defense Pollination • Seed dispersal • Interactions across the life cycle • Conservation: butterflies/host plants Photos: Ricklefs (Economy of Nature), Bradshaw & Schemske, Kalko, http://www.inriodulce.com/links/ants.html http://www.ehow.com/facts_5886553_life-cycle-pl http://freeimagescollection.com/fruits/pap http://activerain.com/blogsview/372556/ ar-authentication-words-what-do-theymeanhttp://www.esu.edu/~milewski/int ro_biol_two/lab_4_seeds_fruits/im ages/berry_kiwi.jpg http://blog.naver.com/PostView.nhn?blogId=rkqrk rakstp&logNo=60101838355&redirect=Dlog&widg etTypeCall=true http://xtine23.files.wordpress.com /2012/07/passion-fruit-seeds.jpg http://store.mancor.org/pomegranat e-seeds-or-fruits-antioxidants-forcancer-prostrate-heart-attacks.aspx http://indianapublicmedia.org/amomentofscienchttp://en.wikipedia.org/wiki/Flowering_plant e/seed-swallower/ https://www.google.com/se US:official&source=lnms&tb US:official&tbm=isch&q=en 0&bih=557&imgrc=71BDdlR 4GdKbjzVx_JM%3Bhttp%25 Durian.jpg%3Bhttp%253A% TODAY: Seed dispersal • Definitions and issues – Seeds, Fruits, Diaspores – Dispersal Syndromes • Abiotic • Biotic – Coevolution? – Dispersal Kernels • Seeds -> Seedlings • Example SEEDS, FRUITS, DIASPORES •Seeds : from ovules •Fruits : from ovaries •Diaspores : dispersal units http://greenanswers.com/q/228460/forests-trees-plants/plants/how-do-plants-reproduce CLASSIC REFERENCES • Sernander 1927, Ulbrich 1928 • Ridley 1930 The Dispersal of Plants Throughout the World (700 pp) • van der Pijl 1969 Principles of Dispersal in Higher Plants (153 pp) Archidendron vaillantii http://nla.gov.au/nla.pic-an67311471 DISPERSAL SYNDROMES (van der Pijl 1969) Biotic Abiotic • Saurochory: reptiles • Epizoochory: animals • Ornithochory: birds • • • • (plus mimetic deceit) • Dyszoochory: mammals (scatter hoarding) • Endozoochory: mammals (accidental vs intentional) • Chiropterochory: bats • Myrmecochory: ants • Piscichory?: fishes Anemochory: wind Hydrochory: water Autochory: ballistics + Barochory: gravity DISPERSAL SYNDROMES (van der Pijl 1969) • Saurochory: reptiles • Epizoochory: animals • Ornithochory: birds • • • (plus mimetic deceit) • Dyszoochory: mammals (scatter hoarding) • Endozoochory: mammals • • • (accidental vs intentional) • Chiropterochory: bats • Myrmecochory: ants • Piscichory?: fishes • • • color, odor, ground-level, hard skin, ancient waterfowl: hard seeds in mud others: barbed, spiny, viscid, burrs signaling color, protections against premature consumption & digestion, odorless, sugar or oil, no hard rind (birds do not have teeth), seeds exposed in/dangling from fruit hard capsules or hard seeds accidental: small, swallowed with vegetation intentional: color not needed, toxins against premature consumption & digestion, signaling odor, sugar or oil, hard rind OK (do have teeth), large seeds, presentation varies by animal group drab color, musty odor, large seeds, strongly attached, exposed outside foliage white oil-bearing elaiosome , dark hard seed, scattered in leaf litter, recent amazonian flood plain forests CO-EVOLUTION? Fruit-frugivore network in Brazilian Atlantic Forest (Parque Estadual Intervales) • Syndromes as evidence that animals select on plant traits? • Do plants select on animal traits? • Extinct dispersers? Silva et al. 2007, Ch 26 in Seed Dispersal: Theory and its Application in a Changing World CO-EVOLUTION? No. of plant species in the diets of manakins in 2 tropical rainforests • Syndromes as evidence that animals select on plant traits? • Do plants select on animal traits? • Extinct et al. 2007, Ch 8 in dispersers? Loiselle Seed Dispersal: Theory and its Application in a Changing World CO-EVOLUTION? • Syndromes as evidence that animals select on plant traits? • Do plants select on animal traits? • Extinct dispersers? Keystone plant species: Figs? DISPERSAL KERNELS (probability of moving a certain distance during one time unit) “Shoebutton Ardisia” in S. Florida Horvitz, Koop &Erickson, unpublished 1.4 x 10 -3 Probability density 1.2 composite catbird-dispersed raccoon-dispersed robin-dispersed 1 0.8 0.6 0.4 0.2 0 0 20 40 60 80 Distance from source, m 100 Model Constant composite (ignore disperser structure) Constant disperser structured (many catbirds, no robins, few raccoons) Constant disperser structured (no robins, shift from catbird to raccoon) Constant disperser structured (shift from catbirds to robins, few raccoons) Time varying disperser structured (occassional robins) 120 Rate of spread, m/yr 3.9 11.4 17.9 34.7 21.6 • Seed shadow • Does it depend upon dispersing animal? • Community context • Community consequence DISPERSAL KERNELS (probability of moving a certain distance during one time unit) Dispruption by exotic animal species From Fenner & Thompson 2005, Seed Dispersal • Seed shadow • Does it depend upon dispersing animal? • Community context • Community consequence DISPERSAL KERNELS (probability of moving a certain distance during one time unit) Janzen-Connell: recruitment “niches” From Ricklefs , Economy of Nature • • • Intense enemies under mothers Offspring need to escape Suitable recruitment sites away from mom (and others of same species) • Seed shadow • Does it depend upon dispersing animal? • Community context • Community consequence TODAY: Seed dispersal • Definitions and issues – Seeds, Fruits, Diaspores – Dispersal Syndromes • Abiotic • Biotic – Coevolution? – Dispersal Kernels • Seeds -> Seedlings • Example The comparative life histories of ant- and birddispersed Marantaceae Lowland neotropical wet forest Costa Rica Dispersal biology: A set number of seeds (no. typically available to dispersers) was observed during 90 minutes • bird-seed interactions • on the plants • during 495 trials • total of 2279 seeds • ant-seed interactions • in the leaf-litter • during 524 trials • total of 1440 seeds Bird-dispersed species… Pleiostachya pruinosa Calathea lasiostachya Calathea marantifolia Calathea lutea Calathea inocephala Photo by D. Graham M io % ne ct e Cl s o ar le av ag is in P Cy ip pr eu an M ra et s i a Ar oco na cor osa c re m u on Ra mo ps s c ata m no a c an ph ps ya de oc c no i e l o n id us iro es Pi pa str p s i H M a ra s e s itr bi m ri os a f en nii pi us ta ng ci lis us ca ca uda ss in ot ii he r of bird-seed interactions Mionectes oleagineus 50 40 Corcovado (N = 516), H' = 1.50, 13 spp La Selva (N = 390), H' = 1.92, 11 spp 30 20 10 0 (Horvitz, C.C., M. A. Pizo, B. Bello y Bello, J. LeCorff and R. Dirzo, 2002) Good and bad birds Gulpers Mashers Calathea lutea Seed shadows of C. lutea differ by bird taxa 40 La Selva Emberizidae 10 20 No. of seeds 0 -10 40 5 0 10 20 Pipridae 20 0 -10 40 0 10 20 Tyrannidae 0 10 20 10 20 10 20 Pipridae 0 -10 200 0 Tyrannidae 100 0 10 20 undispersed 20 0 -10 0 -10 100 50 20 0 -10 40 Corcovado Emberizidae 0 -10 1000 0 undispersed 500 0 10 20 0 -10 Distance, m 0 10 20 Ant-dispersed species Calathea micans Calathea cleistantha Calathea ovandensis Ap ha en og as Pa te ch E r a y c c ta ra on to ne dy mm oi d la e ob a gi s sc bb So uri um c Ec l en orn Pa ta op is t s c h om is y c m sp Pa o a c h ndy ru . y c la idu on a m dy pic la ali s O P h do he ar nt ido pa om l e x ac sp O hu . 2 do nt Phe s b O om id a do o u nt om O ac h l e s ri d u ac on s p . hu to lat 3 m ic s er ac ep s yt h hr us oc sp e Ph ph . a At e id l us ta ol e Pa ce aj p a ch y c Ph h al x on e id ote dy ol s la e s W as co p . m n 1 an Phe s tr ic ni i a dol ta au e ro sp pu . 4 n Ec ctat ito a n sp . ot he r Photo by H. Kennedy % of ant-seed interactions Aphaenogaster araneoides 25 Corcovado (N = 206), H' = 2.76, 24 spp 20 La Selva (N = 453), H' = 2.56, 26 spp 15 10 5 0 (Horvitz, C.C., M. A. Pizo, B. Bello y Bello, J. LeCorff and R. Dirzo. 2002) Good and bad ants Pick-up and remove seeds Odontomachus Take aril bits, but leave seed Solenopsis cleistantha Calathea cleistantha Seed shadows of C. cleistantha differ by ant taxa La Selva Aphaenogaster 20 No. of seeds 10 0 -200 10 0 200 400 600 800 1000 800 1000 800 1000 Pachycondyla apicalis 5 0 -200 20 0 200 400 600 Pachycondyla harpax 10 0 -200 20 0 200 400 600 Pheidole spp and Wasmannia 10 0 -200 0 200 400 600 Distance, cm 800 1000 An hypothesis: ant-dispersed species are less gap-dependent than bird-dispersed species TODAY: Seed dispersal • Definitions and issues – Seeds, Fruits, Diaspores – Dispersal Syndromes • Abiotic • Biotic – Coevolution? – Dispersal Kernels • Seeds -> Seedlings A chimpanzee giving into the temptation to eat a fig in Kibale, as chimpanzees do very often. Photo credit: Alaine Houle http://blogs.scientificamerican.com/guest-blog/2012/08/02/how-to-eat-like-a-chimpanzee /