Mugabo, M, Gilljam, D, Petteway, L et al. (3 more authors) (2019) Environmental degradation amplifies species’ responses to temperature variation in a trophic interaction. Journal of Animal Ecology, 88 (11). pp. 1657-1669. ISSN 0021-8790
Abstract
1. Land‐use and climate change are two of the primary drivers of the current biodiversity crisis. However, we lack understanding of how single‐species and multi‐species associations are affected by interactions between multiple environmental stressors.
2. We address this gap by examining how environmental degradation interacts with daily stochastic temperature variation to affect individual life history and population dynamics in a host‐parasitoid trophic interaction, using the Indian meal moth, Plodia interpunctella, and its parasitoid wasp Venturia canescens.
3. We carried out a single generation individual life history experiment and a multi‐generation microcosm experiment during which individuals and microcosms were maintained at a mean temperature of 26 °C that was either kept constant or varied stochastically, at four levels of host resource degradation, in the presence or absence of parasitoids.
4. At the individual level, resource degradation increased juvenile development time and decreased adult body size in both species. Parasitoids were more sensitive to temperature variation than their hosts, with a shorter juvenile stage duration than in constant temperatures and a longer adult lifespan in moderately degraded environments. Resource degradation also altered the host's response to temperature variation, leading to a longer juvenile development time at high resource degradation. At the population level, moderate resource degradation amplified the effects of temperature variation on host and parasitoid populations compared to no or high resource degradation and parasitoid overall abundance was lower in fluctuating temperatures. Top‐down regulation by the parasitoid and bottom‐up regulation driven by resource degradation contributed to more than 50% of host and parasitoid population responses to temperature variation.
5. Our results demonstrate that environmental degradation can strongly affect how species in a trophic interaction respond to short‐term temperature fluctuations through direct and indirect trait‐mediated effects. The effects are driven by species differences in sensitivity to environmental conditions and modulate top‐down (parasitism) and bottom‐up (resource) regulation. This study highlights the need to account for differences in the sensitivity of species' traits to environmental stressors to understand how interacting species will respond to simultaneous anthropogenic changes.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Authors. Journal of Animal Ecology published by John Wiley & Sons Ltd on behalf of British Ecological Society. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/) |
Keywords: | climate change; environmental variation; habitat modification; host‐parasitoid; life history trajectories; phenological mismatch; population cycles; population dynamics |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biology (Leeds) |
Funding Information: | Funder Grant number NERC NE/N00213X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Jun 2019 12:46 |
Last Modified: | 25 Jun 2023 21:51 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1111/1365-2656.13069 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:147145 |
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