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Introduced herbivores restore late pleistocene ecological functions

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posted on 2023-06-07, 07:45 authored by Erick J Lundgren, Daniel Ramp, John Rowan, Owen Middleton, Simon D Schowanek, Oscar Sanisidro, Scott P Carroll, Matt Davis, Christopher SandomChristopher Sandom, Jens-Christian Svenning, Arian D Wallach
Large-bodied mammalian herbivores dominated Earth’s terrestrial ecosystems for several million years before undergoing substantial extinctions and declines during the Late Pleistocene (LP) due to prehistoric human impacts. The decline of large herbivores led to widespread ecological changes due to the loss of their ecological functions, as driven by their unique combinations of traits. However, recently, humans have significantly increased herbivore species richness through introductions in many parts of the world, potentially counteracting LP losses. Here, we assessed the extent to which introduced herbivore species restore lost—or contribute novel—functions relative to preextinction LP assemblages. We constructed multidimensional trait spaces using a trait database for all extant and extinct mammalian herbivores =10 kg known from the earliest LP (~130,000 ybp) to the present day. Extinction-driven contractions of LP trait space have been offset through introductions by ~39% globally. Analysis of trait space overlap reveals that assemblages with introduced species are overall more similar to those of the LP than native-only assemblages. This is because 64% of introduced species are more similar to extinct rather than extant species within their respective continents. Many introduced herbivores restore trait combinations that have the capacity to influence ecosystem processes, such as wildfire and shrub expansion in drylands. Although introduced species have long been a source of contention, our findings indicate that they may, in part, restore ecological functions reflective of the past several million years before widespread human-driven extinctions.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Proceedings of the National Academy of Sciences (PNAS)

ISSN

0027-8424

Publisher

National Academy of Sciences

Issue

14

Volume

117

Page range

7871-7878

Event location

United States

Department affiliated with

  • Evolution, Behaviour and Environment Publications

Research groups affiliated with

  • Sussex Sustainability Research Programme Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2020-08-21

First Open Access (FOA) Date

2020-09-24

First Compliant Deposit (FCD) Date

2020-08-21

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