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Counteracting Cascades Challenge the Heterogeneity—Stability Relationship
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Matthew J. Perkins ,
James Bull ,
John Griffin
Ecology Letters, Volume: 28, Issue: 8
Swansea University Authors:
Jordi Sola Codina, Tom Fairchild , James Bull , John Griffin
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DOI (Published version): 10.1111/ele.70158
Abstract
Spatial environmental heterogeneity is widely assumed to enhance ecological stability by promoting refugia, biodiversity and asynchrony. Yet, we lack field experiments testing this fundamental relationship and its underlying mechanisms in naturally assembled multitrophic systems. To address this gap...
| Published in: | Ecology Letters |
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| ISSN: | 1461-023X 1461-0248 |
| Published: |
Wiley
2025
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa69742 |
| Abstract: |
Spatial environmental heterogeneity is widely assumed to enhance ecological stability by promoting refugia, biodiversity and asynchrony. Yet, we lack field experiments testing this fundamental relationship and its underlying mechanisms in naturally assembled multitrophic systems. To address this gap, we monitored experimental substrates replicating topographic heterogeneity on a rocky shore over 3 years. Contrary to theory, heterogeneity showed no net effect on community stability due to four counteracting pathways. Heterogeneity increased stability by (i) providing refugia that enhanced population stability and (ii) boosting species richness, which promoted asynchrony. At the same time, it decreased stability by (iii) reducing a dominant non-native species and (iv) suppressing consumers, both of which otherwise stabilised community composition. These opposing processes cancelled out the heterogeneity–stability relationship, highlighting the complex and multi-causal nature of this relationship. We caution against the assumption that increasing heterogeneity universally enhances stability, particularly in systems with strong consumer interactions and dominant species. |
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| Keywords: |
habitat complexity; habitat structure; marine rocky shore; stress gradient; substrate topography |
| College: |
Faculty of Science and Engineering |
| Funders: |
Natural Environment Research Council (Grant Number: NE/W006650/1); Swansea University |
| Issue: |
8 |