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Abundancia relativa de Hyale sp. (Crustacea: Amphipoda) en el cinturon de Iridaea laminarioides (Rhodophyceae) en Bahia Coliumo, Chile = Relative abundance of Hyale sp. (Crustacea: Amphipoda) at the Iridaea laminarioides (Rhodophyceae) belt in Coliumo Bay, Chile
Veas, R.; Landaeta, M.; Romo, H. (1997). Abundancia relativa de Hyale sp. (Crustacea: Amphipoda) en el cinturon de Iridaea laminarioides (Rhodophyceae) en Bahia Coliumo, Chile = Relative abundance of Hyale sp. (Crustacea: Amphipoda) at the Iridaea laminarioides (Rhodophyceae) belt in Coliumo Bay, Chile. Gayana Oceanol. 5(1): 77-86
In: Gayana Oceanológica. Universidad de Concepcion. Facultad de Ciencias Naturales y Oceanograficas: Concepción. ISSN 0716-9655, more
Peer reviewed article  

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  • Veas, R.
  • Landaeta, M.
  • Romo, H.

Abstract
    The community associated with the intertidal red seaweed Iridaea laminarioides Bory belt, and the aggregation of the gamaridean amphipods Hyale spp. was studied in two sheltered sites of Coliumo Bay, Chile (36 degree 32'S; 72 degree 02'W) both with different topography and degree of exposure to the waves. At Litril and Villarrica sites, the vegetation and the invertebrate community were dominated by Iridaea and Hyale respectively; but while in the more sheltered shore of Litril, the belt was fully dominated by the above cited species, in the lower levels of Villarrica (relatively more exposed site), Iridaea shared the importance with the red seaweed Mastocarpus papillatus (C. Agardh) Kuetzing, and Hyale with larvae of mytilids. Such differences in dominance allowed that the community of the Iridaea belt of Villarrica to show significatively higher values of species richness, species diversity and evenness than in Litril. A significant and positive correlation was found between the numerical dominance of Iridaea and Hyale. This seems to be in connection with the coincidental decreasing vertical gradient of both species, and consequently it would be allowing to the amphipods to use the Iridaea belt for food and refuge. The importance of the abundance of fertile phases on the degree of aggregation of the amphipods is discussed.

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