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Niche differentiation among invasive Ponto-Caspian Chelicorophium species (Crustacea, Amphipoda, Corophiidae) by food particle size

Borza, Péter and Huber, Thomas and Leitner, Patrick and Remund, Nadine and Graf, Wolfram (2018) Niche differentiation among invasive Ponto-Caspian Chelicorophium species (Crustacea, Amphipoda, Corophiidae) by food particle size. AQUATIC ECOLOGY, 52 (2). pp. 179-190. ISSN 1386-2588

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Abstract

After Chelicorophium curvispinum, two other Ponto-Caspian tube-dwelling, filter-feeding amphipod species (Chelicorophium robustum and Chelicorophium sowinskyi) have colonized several catchments in Central and Western Europe in recent decades. To reveal the mechanism of niche differentiation among them, we measured the mesh sizes of their filtering apparatus and analyzed multi-habitat sampling data from the River Danube using RDA-based variance partitioning between environmental and spatial explanatory variables. Morphometric data showed a clear differentiation among the species by filter mesh size (C. curvispinum > C. robustum > C. sowinskyi). Field data also indicated the relevance of suspended matter; however, the mere quantity of suspended solids included in the analysis could not explain the abundance patterns effectively. Current velocity, substrate types, and total nitrogen content also had a non-negligible effect; however, their role in the niche differentiation of the species is not evident. In summary, differences in their filter mesh sizes indicate a niche differentiation by food particle size among the invasive Chelicorophium species, allowing their stable coexistence given sufficient size variability in their food source. Consequently, the two recent invaders increase the effectiveness of resource utilization, resulting in a more intensive benthic–pelagic coupling in the colonized ecosystems.

Item Type: Article
Subjects: Q Science / természettudomány > QL Zoology / állattan
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 30 Aug 2018 10:17
Last Modified: 30 Aug 2018 10:17
URI: http://real.mtak.hu/id/eprint/83073

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