Simulating the role of connectivity in shaping stream insect metacommunities under colonization cycle dynamics

Durães, Lucas, Roque, Fabio O., Siqueira, Tadeu, Santos, Anderson M., Borges, Magno A., and Rezende, Renan S. (2016) Simulating the role of connectivity in shaping stream insect metacommunities under colonization cycle dynamics. Ecological Modelling, 334. pp. 19-26.

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We simulated metacommunities in a hypothetical riverine network to investigate whether and how connectivity affects the species richness of groups with different dispersal abilities under different niche- and dispersal-assembly rules. The simulated network was represented by a graph in which the nodes represented habitat patches, each with a particular environmental condition. We built our model based on Müller's "colonization cycle" hypothesis, in which adult aquatic insects compensate for the gradual downstream movement of larvae by flying preferentially upstream to oviposition. Species occurrence in each patch was probabilistically determined, taking into account environmental filtering and/or dispersal ability in different assembly scenarios. Variation in local species richness was explained by connectivity in both assembly scenarios, especially when dispersal ability was weak. In niche assembly metacommunities, the effect of connectivity was also dependent on the location of preferable patches. In general, local species richness was higher when dispersal ability was strong. Our findings suggest that the role of connectivity in shaping riverine metacommunities is context dependent and that the spatial structure of riverine networks should be considered in monitoring freshwater biota.

Item ID: 49314
Item Type: Article (Research - C1)
ISSN: 1872-7026
Keywords: aquatic insects; assembly rules; connectivity; dendritic networks; dispersal limitation
Funders: São Paulo Research Foundation (FAPESP), CNPq, Brazil
Projects and Grants: FAPESP grant #23/200.575/2012, FAPESP grant #2013/50424-1, CNPq grant #303293/2009-8
Date Deposited: 12 Jun 2017 01:20
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310304 Freshwater ecology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity @ 100%
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