Climate change fluctuations can increase population abundance and range size

Author:

MacDonald Jane Shaw1,Lutscher Frithjof12ORCID,Bourgault Yves1

Affiliation:

1. Department of Mathematics and Statistics University of Ottawa Ottawa Ontario Canada

2. Department of Biology University of Ottawa Ottawa Ontario Canada

Abstract

AbstractClimate change threatens many species by a poleward/upward movement of their thermal niche. While we know that faster movement has stronger impacts, little is known on how fluctuations of niche movement affect population outcomes. Environmental fluctuations often affect populations negatively, but theory and experiments have revealed some positive effects. We study how fluctuations around the average speed of the niche impact a species' persistence, abundance and realized niche width under climate change. We find that the outcome depends on how fluctuations manifest and what the relative time scale of population growth and climate fluctuations are. When populations are close to extinction with the average speed, fluctuations around this average accelerate population decline. However, populations not yet close to extinction can increase in abundance and/or realized niche width from such fluctuations. Long‐lived species increase more when their niche size remains constant, short‐lived species increase more when their niche size varies.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

Wiley

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