Highly variable species distribution models in a subarctic stream metacommunity : Patterns, mechanisms and implications

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de Mendoza , G , Kaivosoja , R , Grönroos , M , Hjort , J , Ilmonen , J , Kärnä , O-M , Paasivirta , L , Tokola , L & Heino , J 2018 , ' Highly variable species distribution models in a subarctic stream metacommunity : Patterns, mechanisms and implications ' , Freshwater Biology , vol. 63 , no. 1 , pp. 33-47 . https://doi.org/10.1111/fwb.12993

Title: Highly variable species distribution models in a subarctic stream metacommunity : Patterns, mechanisms and implications
Author: de Mendoza, Guillermo; Kaivosoja, Riikka; Grönroos, Mira; Hjort, Jan; Ilmonen, Jari; Kärnä, Olli-Matti; Paasivirta, Lauri; Tokola, Laura; Heino, Jani
Contributor organization: Environmental Sciences
Nature-Based Solutions
Date: 2018-01
Language: eng
Number of pages: 15
Belongs to series: Freshwater Biology
ISSN: 0046-5070
DOI: https://doi.org/10.1111/fwb.12993
URI: http://hdl.handle.net/10138/309490
Abstract: 1. Metacommunity theory focuses on assembly patterns in ecological communities, originally exemplified through four different, yet non-exclusive, perspectives: patch dynamics, species sorting, source-sink dynamics, and neutral theory. More recently, three exclusive components have been proposed to describe a different metacommunity framework: habitat heterogeneity, species equivalence, and dispersal. Here, we aim at evaluating the insect metacommunity of a subarctic stream network under these two different frameworks. 2. We first modelled the presence/absence of 47 stream insects in northernmost Finland, using binomial generalised linear models (GLMs). The deviance explained by pure local environmental (E), spatial (S), and climatic variables (C) was then analysed across species using beta regression. In this comparative analysis, site occupancy, as well as taxonomic and biological trait vectors obtained from principal coordinate analysis, were used as predictor variables. 3. Single-species distributions were better explained by in-stream environmental and spatial factors than by climatic forcing, but in a highly variable fashion. This variability was difficult to relate to the taxonomic relatedness among species or their biological trait similarity. Site occupancy, however, was related to model performance of the binomial GLMs based on spatial effects: as populations are likely to be better connected for common species due to their near ubiquity, spatial factors may also explain better their distributions. 4. According to the classical four-perspective framework, the observation of both environmental and spatial effects suggests a role for either mass effects or species sorting constrained by dispersal limitation, or both. Taxonomic and biological traits, including the different dispersal capability of species, were scarcely important, which undermines the patch dynamics perspective, based on differences in dispersal ability between species. The highly variable performance of models makes the reliance on an entirely neutral framework unrealistic as well. According to the three-component framework, our results suggest that the stream insect metacommunity is shaped by the effect of habitat heterogeneity (supporting both species-sorting and mass effects), rather than species equivalence or dispersal limitation. 5. While the relative importance of the source-sink dynamics perspective or the species-sorting paradigm cannot be deciphered with the data at our disposal, we can conclude that habitat heterogeneity is an important driver shaping species distributions and insect assemblages in subarctic stream metacommunities. These results exemplify that the use of the three-component metacommunity framework may be more useful than the classical four perspective paradigm in analysing metacommunities. Our findings also provide support for conservation strategies based on the preservation of heterogeneous habitats in a metacommunity context.
Description: Special Issue: Metacommunities in river networks: The importance of network structure and connectivity on patterns and processes
Subject: 1181 Ecology, evolutionary biology
beta regression
comparative analysis
metacommunity theory
single-species distribution models
stream macroinvertebrates
subarctic streams
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion

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