The structure of gammarid amphipod (Crustacea, Peracarida) assemblages associated with Sargassum (Phaeophyta, Fucales) and their link with the structural complexity of algae

The structure of gammarid amphipod (Crustacea, Peracarida) assemblages associated with Sargassum... The structural complexity of algae is an important factor driving the structure of epifaunal assemblages associated with marine macroalgae. We tested how the structural complexity of four Sargassum species is related to the structure of gammarid assemblages. We measured different algae traits (frond length, number of branches, and epiphytic hydroid and algae cover) and different ecological descriptors of gammarid assemblages (richness, density, diversity, and evenness). Samples were obtained in southeastern Brazil in early and late summer. Structural complexity was associated with the occurrence of significantly different gammarid assemblages. Sargassum cymosum had more branches and greater hydroid coverage, and a higher gammarid species richness, diversity, and density. The characteristics of the gammarids inhabiting the different Sargassum species were similar between sampling periods, indicating that the relationships between the Sargassum traits and associated gammarids are strong and persistent. Species richness, diversity, and density were all more dependent on habitat heterogeneity (number of branches and coverage of epiphytic hydroid) than the quantity of habitable space, i.e., frond length. Overall, the variation in structural complexity among Sargassum species had a significant effect on gammarid assemblage structure. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Hydrobiologia Springer Journals

The structure of gammarid amphipod (Crustacea, Peracarida) assemblages associated with Sargassum (Phaeophyta, Fucales) and their link with the structural complexity of algae

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer International Publishing AG, part of Springer Nature
Subject
Life Sciences; Freshwater & Marine Ecology; Ecology; Zoology
ISSN
0018-8158
eISSN
1573-5117
D.O.I.
10.1007/s10750-018-3661-5
Publisher site
See Article on Publisher Site

Abstract

The structural complexity of algae is an important factor driving the structure of epifaunal assemblages associated with marine macroalgae. We tested how the structural complexity of four Sargassum species is related to the structure of gammarid assemblages. We measured different algae traits (frond length, number of branches, and epiphytic hydroid and algae cover) and different ecological descriptors of gammarid assemblages (richness, density, diversity, and evenness). Samples were obtained in southeastern Brazil in early and late summer. Structural complexity was associated with the occurrence of significantly different gammarid assemblages. Sargassum cymosum had more branches and greater hydroid coverage, and a higher gammarid species richness, diversity, and density. The characteristics of the gammarids inhabiting the different Sargassum species were similar between sampling periods, indicating that the relationships between the Sargassum traits and associated gammarids are strong and persistent. Species richness, diversity, and density were all more dependent on habitat heterogeneity (number of branches and coverage of epiphytic hydroid) than the quantity of habitable space, i.e., frond length. Overall, the variation in structural complexity among Sargassum species had a significant effect on gammarid assemblage structure.

Journal

HydrobiologiaSpringer Journals

Published: May 29, 2018

References

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