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More than the sum of the parts: annual partitioning within spatial guilds underpins community regulation

Research output: Contribution to journalArticle

Abstract

To withstand the pressures of a rapidly changing world, resilient ecosystems should exhibit compensatory dynamics, including uncorrelated temporal shifts in population sizes. The observation that diversity is maintained through time in many systems is evidence that communities are indeed regulated and stabilized, yet empirical observations suggest that positive covariance in species abundances is widespread. This paradox could be resolved if communities are composed of a number of ecologically relevant sub-units in which the members compete for resources, but whose abundances fluctuate independently. Such modular organization could explain community regulation, even when the community as a whole appears synchronized.To test this hypothesis, we quantified temporal synchronicity in annual population abundances within spatial guilds in an estuarine fish assemblage that has been monitored for 36 years. We detected independent fluctuations in annual abundances within guilds. By contrast, the assemblage as a whole exhibited temporal synchronicity—an outcome linked to the dynamics of guild dominants, which were synchronized with each other. These findings underline the importance of modularity in explaining community regulation and highlight the need to protect assemblage composition and structure as well as species richness.
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Original languageEnglish
Article number20180659
Number of pages6
JournalProceedings of the Royal Society B: Biological Sciences
Volume285
Issue number1883
Early online date18 Jul 2018
DOIs
Publication statusPublished - 25 Jul 2018

    Research areas

  • Synchrony, Estuarine fish, Time series, Modularity, Community stability

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