Lake food webs: Species invasion progressively disrupts the trophic structure of native food webs
Authors/Creators
- 1. United States Fish and Wildlife Service
- 2. United States Geological Survey
- 3. Flathead Lake Biological Station, University of Montana*
- 4. Montana Fish, Wildlife & Parks
Description
Species invasions can have substantial impacts on native species and ecosystems, with important consequences for biodiversity. How these disturbances drive changes in the trophic structure of native food webs through time is poorly understood. Here, we quantify trophic disruption in freshwater food webs to invasion by an apex fish predator, lake trout, using an extensive stable isotope dataset across a natural gradient of uninvaded and invaded lakes in the northern Rocky Mountains, USA. Lake trout invasion increased fish diet variability (trophic dispersion), displaced native fishes from their reference diets (trophic displacement), and reorganized macroinvertebrate communities, indicating strong food web disruption. Trophic dispersion was greatest 25-50 years after colonization and dissipated as food webs stabilized in later stages of invasion (>50 years). For the native apex predator, bull trout, trophic dispersion preceded trophic displacement, leading to their functional loss in late-invasion food webs. Our results demonstrate how invasive species progressively disrupt native food webs via trophic dispersion and displacement, ultimately yielding biological communities strongly divergent from those in uninvaded ecosystems.
Notes
This repository holds scripts, datasets, and an Rmarkdown for "Species invasion progressively disrupts the trophic structure of native food webs."
The contents of this repository are named and briefly described below.
The Rmarkdown provides a step-by-step explanation of the analyses in this project.
rmd_food_web_10012020_14.html (Rmarkdown html document explaining unified R script's analyses with code chunks and figures)
rmd_food_web_10012020_14.rmd (the R file to produce the html version of the Rmarkdown)
The unified R script is annotated, calls the study's main isotope dataset, and includes code to reproduce analyses.
unified_food_web_script_08242020_29.R (study's main R script)
isotope_dataset_MT_lake_trout_food_web_11072020.csv (study's main dataset)
Besides the main isotope dataset, the unified R script also calls three other datasets:
transect_data.csv (for NMDS ordinations)
lake_data.csv (for NMDS ordinations)
conversion_09302020_2.csv (for binomial regression)
The lake trout diet MixSIAR script is separate from the unified script.
lake_trout_mixsiar_model_08272020_3.R (lake trout diet R script)
lake_trout_mix.csv (MixSIAR mixtures; this is called in the lake trout diet R script)
lake_trout_source2.csv (MixSIAR sources; this is called in the lake trout diet R script)
lake_trout_trophic_discrimination2.csv (MixSIAR discrimination factors; this is called in the lake trout diet R script)
Two other scripts make multi-panel plots from the contents of the unified food web script.
trophic_disruption_superplot_11132020.R (combines trophic dispersion and displacement results into one figure)
script_superplot_overlap_conversion_11132020_3.R (combines diet overlap and conversion results into one figure)
Funding provided by: U.S. Geological Survey
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000203
Award Number:
Funding provided by: Flathead Lake Biological Station*
Crossref Funder Registry ID:
Award Number:
Funding provided by: Flathead Lake Biological Station
Crossref Funder Registry ID:
Files
conversion_09302020_2.csv
Files
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Additional details
Related works
- Is derived from
- 10.5281/zenodo.4906168 (DOI)
- Is source of
- 10.5281/zenodo.4906170 (DOI)