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The roles of environment, site position, and seasonality in taxonomic and functional organization of chironomid assemblages in a heterogeneous wetland, Kis-Balaton (Hungary)

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Abstract

Environmental heterogeneity plays a determinant role in structuring taxonomic and functional composition of local assemblages via various interacting processes as synthesized in the metacommunity theory. In this study, we evaluate the relative roles of local environmental and landscape filters, spatial constraints and seasonality in organization of assemblages of Chironomidae (Diptera), a diverse aquatic insect group with winged adults, in an extremely heterogeneous wetland system, Kis-Balaton, Hungary. As expected, local environmental variables explained a substantial proportion of assemblage variance mainly along sediment structure, macrophyte coverage, and decomposing plant matter gradients. Considering the narrow spatial range of the study area, pure spatial influence was unexpectedly strong, likely because of the dispersal limitation related to tall terrestrial vegetation patches and mass effect related to the uneven distribution and area of certain microhabitats and their species pools. However, landscape- and season-related variability proved to be low or negligible. Taxonomic and functional feeding guild (FFG)-based approaches revealed the same main trends in assemblage data; however, FFGs seemed to track environmental changes more tightly. We argue for the common use of taxonomic and functional-based approaches and advise the improvement of species optima and tolerance spectra databases to expand bioassessment power.

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Acknowledgments

We thank Adrienn Tóth for her assistance in the field and Steve Juggins for providing us a free C2 license. This research was supported by the European Union and the State of Hungary, co-financed by the European Social Fund in the framework of TÁMOP-4.2.4.A/2-11/1-2012-0001 ‘National Excellence Program’ and GINOP-2.3.2-15-2016-00019. The work of Mónika Tóth was also supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences.

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  1. Balaton Limnological Institute, MTA Centre for Ecological Research, Klebelsberg K. str. 3., Tihany, 8237, Hungary

    Diána Árva, Mónika Tóth, Attila Mozsár & András Specziár

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  1. Diána Árva
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Árva, D., Tóth, M., Mozsár, A. et al. The roles of environment, site position, and seasonality in taxonomic and functional organization of chironomid assemblages in a heterogeneous wetland, Kis-Balaton (Hungary). Hydrobiologia 787, 353–373 (2017). https://doi.org/10.1007/s10750-016-2980-7

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