Simulated trapping and trawling exert similar selection on fish morphology
Cite this dataset
Thambithurai, Davide et al. (2023). Simulated trapping and trawling exert similar selection on fish morphology [Dataset]. Dryad. https://doi.org/10.5061/dryad.pk0p2ngq2
Abstract
Commercial fishery harvest can influence the evolution of wild fish populations. Our knowledge of selection on morphology is however limited, with most previous studies focusing on body size, age and maturation. Within species, variation in morphology can influence locomotor ability, possibly making some individuals more vulnerable to capture by fishing gears. Additionally, selection on morphology has the potential to influence other foraging, behavioural, and life-history related traits. Here we carried out simulated fishing using two types of gears: a trawl (active gear) and trap (a passive gear), to assess morphological trait-based selection in relation to capture vulnerability. Using geometric morphometrics, we assessed differences in shape between high and low vulnerability fish, showing that high vulnerability individuals display shallower body shapes regardless of gear type. For trawling, low vulnerability fish displayed morphological characteristics that may be associated with higher burst-swimming, including a larger caudal region and narrower head, similar to evolutionary responses seen in fish populations responding to natural predation. Taken together, these results suggest that divergent selection can lead to phenotypic differences in harvested fish populations.
Methods
This is a grouped dataset created in the R programming language. Data should be used in conjunction with an R script which is found as supplementary materials in the associated article. The dataset will is used to recreate the statistical analyses presented in the article.
Usage notes
File structure:
file name: gdf.all - global dataset of all fish
coords: procrustes shapes for each fish
Csize: centroid size for each fish
treat: factor indicating what group fish belonged to (high vulnerability or low vulnerability)
gear: gear of each fish
sex: sex of each fish
mass: mass of each fish
length: length of each fish
file name: gdf.tra and gdf.trw - Similar to gdf.all but subsetted for each gear
file name: trap.list and trawl.list - Contain raw morphological coordinates for fish
fish: raw morphological coordinates taken from fish
length: factor indicating what group fish belonged to (high vulnerability or low vulnerability)
file name: fin.df = data used for caudal area and caudal aspect ratio models
caudal_height: caudal height for each fish in mm
caudal_area: caudal area for each fish in mm sq
gear: gear of each fish
treatment: factor indicating what group fish belonged to (high vulnerability or low vulnerability)
tag.id: elastomer tag code for each fish
w.weight: mass of each fish in grams
sl.length: standard length of each fish in mm
sex: sex of each fish
Below are the packages and versions used to reproduce analysis.
R version 4.1.2 (2021-11-01)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19042)
Matrix products: default
locale:
[1] LC_COLLATE=English_United Kingdom.1252 LC_CTYPE=English_United Kingdom.1252
[3] LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C
[5] LC_TIME=English_United Kingdom.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] bootStepAIC_1.2-0 smatr_3.4-8 MASS_7.3-54 caret_6.0-90 lattice_0.20-45 geomorph_4.0.1
[7] Matrix_1.3-4 rgl_0.108.3 RRPP_1.1.2 forcats_0.5.1 stringr_1.4.0 dplyr_1.0.7
[13] purrr_0.3.4 readr_2.0.2 tidyr_1.1.4 tibble_3.1.5 ggplot2_3.3.5 tidyverse_1.3.1
Funding
European Research Council, Award: 640004
Natural Environment Research Council, Award: NE/J019100/1