Additional file 3 – Data Extraction criteria
Description/Data
Heading Full
Heading short
Units
Description
Description
Count
Count
Number
Running number of data entry
Description
Unique Identifier
ID
Number/letters
A link between the data and descriptor (e.g. 64b)
Description
Short Reference
Ref
Name date
The short paper reference (e.g. Kaiser et al. 2006)
Description
Study Type
Study
Categorical
experimental = 1 or comparative = 2
Description
Treatment
Trt
Categorical
The impact event (e.g. bait digging, beam trawling)
Description
Number of discrete disturbance
events
Ndis
Count
Describes the number of discrete disturbance events. E.g. an
experimental plot trawled 10 times in one day will be counted as one
disturbance event. In contrast a study that disturbed the same site on
consecutive dates separated by weeks or months will be regarded as a
multiple disturbance. Chronic disturbance in comparative studies was
recorded as equal to 99 disturbance events.
Description
Actual number of disturbances per
event (i.e. day)
Indis
Count
How many disturbance incidences per disturbance event e.g. if the
experimental plot was trawled 10 times in one day then the intensity
was scored as 10.
Description
Minimum dimension of a
disturbance event
Smin
Meters
Minimum dimension of a disturbance incidence usually determined
by the width of the gear used to create the disturbance. E.g. one
passage with a 4 m wide trawl would be recorded as 4 m. However,
10 parallel passages with a 4 m trawl would be recorded as 40 m.
Important as this determines the smallest distance an animal will
have to migrate to recolonise a disturbed plot.
1
Description
Maximum dimension of
disturbance event
Smax
Meters
Maximum dimension of the disturbed area, e.g. a trawl track 4 m
wide and 2000 m long would be recorded as scale max = 2000 m
Description
Sampling gear
Gear
Categorical
Sampling gear used by studies to determine biological changes e.g.
video survey, Day grab
Description
Area of study e.g. North Sea
Area
Qualitative
Area where study was located, e.g. North Sea.
Description
Region of study e.g. northern
Europe
Region
Qualitative
Region where study was located, e.g. Northern Europe
Description
Latitudinal Region
Lat
Categorical
Climatic Region, tropic = tro, sub tropic = subt, warm temperate =
wt, cold temperate = ct, polar = po
Description
Tidal range
tid
Categorical
Study carried out in the subtidal or intertidal
Description
Maximum depth
Dmax
Meters
Maximum depth at which study was undertaken
Description
Minimum depth
Dmin
Meters
Minimum depth at which study was undertaken
Description
Habitat
Hab
Categorical
Habitat description as reported in the study e.g. gravely sand
Description
General Habitat
GenHab
Categorical
General Habitat reclassified using the EUNIS code to ensure the
standardised categorization within the database
Description
Physical Data
Phys
Yes/No
Is physical data available Yes/No
Description
Fauna Type
Fauna
Categorical
What is the fauna that is analysed? E.g. infauna/epifauna/single
species
Description
Infauna or Epifauna
InEp
Infauna/Epifauna
Infauna or Epifauna
Description
Number of replicate sites
Rep
Count
Number of samples collected within a replicate site or plot
Description
Time of recovery
tRec
Days
Maximum number of recovery days monitored by the study (days
after the last disturbance incident)
2
Description
Spread sheet Data
SS Data
Yes/No
Raw data available in form of spreadsheets yes/no
Description
Notes
Notes
Qualitative
any notes on the study description
Data
Count
Count
Count
Running number of data entry
Data
Response unit
Uresp
Categorical
Response data type e.g. fauna; physical parameters, indices
Data
Biometric
Biomet
Qualitative
Parameter whose response to trawling etc has been measured, e.g. a
species, taxon, order, diversity index, sediment characteristic.
Data
Phylum
Phylum
Categorical
Taxonomic classification
Data
Class
Class
Categorical
Taxonomic classification
Data
Order
Order
Categorical
Taxonomic classification
Data
Species
Species
Categorical
Taxonomic classification
Data
Biomass
Biom.
Yes/No
Type of raw data - biomass data yes/no
Data
Time sampled after disturbance
tReported
Hours/Days/Weeks/Months
Reported time in days sampled after disturbance incidence (e.g. 1-5)
Data
Adjusted time of sampling after
disturbance event
tAdjusted
Days
adjusted time in days sampled after disturbance incidence (e.g. 5)
Data
Raw Units
rUnits
Varied
Units as reported by the study
Data
Units in M2
M2Units
M2
Units standardized to M2
Data
Background fishing disturbance
rbDist_cont
Varied
Background disturbance of control site if known when used in
comparative studies
Data
Standardised Background fishing
disturbance
St.bDist_cont
Trawls year-1
Standardised background disturbance of control site if known when
used in comparative studies as trawling events per year for that
region
3
Data
Background environmental
disturbance
BGEnv
As reported
Background environmental disturbance of the study site. Might
include current, tidal stress, wind stress etc.
Data
Raw data for Control plots
r_Cont
Varied
Raw data for control plots as extracted from the study
Data
Variance of raw control plot
var_Cont
Variance
Variance of raw control data
Data
Number of samples from control
n_Cont
Count
Number of samples taken at control site/plot
Data
Area of each sample
Ar_sampledCON
M2
what is the area of ground sampled by the grab
Data
Volume of each sample
Vol_sampledCON
M2
what is the volume of sediment sampled by the grab
Data
Background disturbance level of
treatment site
bDist_trt
Varied
Background disturbance of treatment site
Data
Background disturbance of
treatment site
bDist_trt
trawls year-1
Standardised background disturbance of treatment site
Data
Raw Data treatment as extracted
from the study
raw treatment
Varied
Raw data treatment as extracted from the study
Data
Variance treatment
varT
Variance
Variance of raw treatment data
Data
Area of each sample in trt
Ar_sampledTRT
M2
What is the area of ground sampled by the grab
Data
Volume of each sample in trt
Vol_sampledTRT
M2
What is the volume of sediment sampled by the grab
Data
Number of samples in treatment
sampT
Count
Number of samples taken at treatment site/plot
Data
Hedges d'
Hd
Hedges d'
Calculated effect size
4