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Dryad

The hidden legacy of megafaunal extinction: loss of functional diversity and resilience over the late Quaternary at Hall’s Cave

Data files

Jan 21, 2022 version files 27.85 KB

Abstract

This dataset contains trait data and R code used in the analysis for the paper “Hedberg, C.P., Lyons S.K., & Smith F.A. (2021). THe Hidden Legacy of megafaunal extinction: loss of functional diversity and resilience over the Late Quaternary at Hall's Cave. Global Ecology and Biogeography. https://doi.org/10.1111/geb.13428”

We collected data for eight functional traits (mass, diet, arboreality, cursoriality, soil disturbance, group size, activity period, migration habit) that collectively describe a species’ ecological role and influence on ecosystem processes. With these data, we investigated changes in functional diversity and redundancy of a local mammal community over time at Hall’s Cave, a site in Central Texas with a continuous record from 21,000 years ago to the present. Additionally, we included several common introduced and domestic species to the modern community to test whether they restore some lost ecological function. 

We found that declines in functional diversity were greater than expected given the decrease in species richness, implying lost taxa contributed higher than average distinct ecological function. Functional distances between remaining species increased through time leading to lowered functional redundancy in younger communities. However, recently introduced taxa increased functional diversity to levels similar to the Holocene and partially restored functional space occupied by Late Pleistocene fauna. Our local-scale analysis demonstrates how prolonged biodiversity erosion not only leads to functionally depauperate communities, but critically lowers ecological resilience to future disturbance.