Beyond the continuum: a multi-dimensional phase space for neutral-niche community assembly

Guillaume Latombe, Cang Hui, Melodie A McGeoch

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Neutral and niche processes are generally considered to interact in natural communities along a continuum, exhibiting community patterns bounded by pure neutral and pure niche processes. The continuum concept uses niche separation, an attribute of the community, to test the hypothesis that communities are bounded by pure niche or pure neutral conditions. It does not accommodate interactions via feedback between processes and the environment. By contrast, we introduce the Community Assembly Phase Space (CAPS), a multidimensional space that uses community processes (such as dispersal and niche selection) to define the limiting neutral and niche conditions and to test the continuum hypothesis. We compare the outputs of modelled communities in a heterogeneous landscape, assembled by pure neutral, pure niche and composite processes. Differences in patterns under different combinations of processes in CAPS reveal hidden complexity in neutral–niche community dynamics. The neutral–niche continuum only holds for strong dispersal limitation and niche separation. For weaker dispersal limitation and niche separation, neutral and niche processes amplify each other via feedbackwith the environment. This generates patterns that lie well beyond those predicted by a continuum. Inferences drawn frompatterns about community assembly processes can therefore bemisguided when based on the continuum perspective. CAPS also demonstrates the complementary information value of different patterns for inferring community processes and captures the complexityof communityassembly. It provides a general tool for studying the processes structuring communities and can be applied to address a range of questions in community and metacommunity ecology.
Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalProceedings of the Royal Society B: Biological Sciences
Volume282
Issue number1821
DOIs
Publication statusPublished - 2015

Keywords

  • Community
  • Filter paradigm
  • Macroecological patterns
  • Metacommunity ecology
  • Neutral theory
  • Neutral–niche continuum

Cite this

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abstract = "Neutral and niche processes are generally considered to interact in natural communities along a continuum, exhibiting community patterns bounded by pure neutral and pure niche processes. The continuum concept uses niche separation, an attribute of the community, to test the hypothesis that communities are bounded by pure niche or pure neutral conditions. It does not accommodate interactions via feedback between processes and the environment. By contrast, we introduce the Community Assembly Phase Space (CAPS), a multidimensional space that uses community processes (such as dispersal and niche selection) to define the limiting neutral and niche conditions and to test the continuum hypothesis. We compare the outputs of modelled communities in a heterogeneous landscape, assembled by pure neutral, pure niche and composite processes. Differences in patterns under different combinations of processes in CAPS reveal hidden complexity in neutral–niche community dynamics. The neutral–niche continuum only holds for strong dispersal limitation and niche separation. For weaker dispersal limitation and niche separation, neutral and niche processes amplify each other via feedbackwith the environment. This generates patterns that lie well beyond those predicted by a continuum. Inferences drawn frompatterns about community assembly processes can therefore bemisguided when based on the continuum perspective. CAPS also demonstrates the complementary information value of different patterns for inferring community processes and captures the complexityof communityassembly. It provides a general tool for studying the processes structuring communities and can be applied to address a range of questions in community and metacommunity ecology.",
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Beyond the continuum: a multi-dimensional phase space for neutral-niche community assembly. / Latombe, Guillaume; Hui, Cang; McGeoch, Melodie A.

In: Proceedings of the Royal Society B: Biological Sciences, Vol. 282, No. 1821, 2015, p. 1-10.

Research output: Contribution to journalArticleResearchpeer-review

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