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Habitat and food selection by herbivorous amphipods associated with macroalgal beds on the southeast coast of Brazil

Abstract

The factors that influence the selection of marine macrophytes by meso-herbivores are complex, and may include the nutritional quality of algae, the value of the habitat as a shelter, and the availability of algae in the environment. Here we investigated the existence of differential use of Sargassum filipendula C. Agardh, 1824 (Phaeophyta) and Galaxaura stupocaulon Kjellman, 1900 (Rhodophyta) as habitats and feeding resources by species of Hyalidae and Ampithoidae, in laboratory manipulation experiments and in an algal bed on the northern coast of the state of São Paulo, Brazil. In the field, 19 fronds were collected from each alga and the associated amphipods were identified and counted. To evaluate food preference and habitat selection by amphipods, we conducted laboratory experiments using containers containing fragments of algae and individuals of Cymadusa filosa Savigny, 1816 or Hyale nigra (Haswell, 1879). In natural conditions, the density of C. filosa was significantly higher on G. stupocaulon, while in the feeding and habitat preference experiment we found a higher density on S. filipendula. The densities of H. nigra did not differ between the algae in both experiments, probably as a result of the variety of food items in its diet, and its high mobility and wide distribution on different substrates. The different results for C. filosa suggest that the pattern of feeding and habitat selection can be affected by external characteristics of the algae; probably, refuge from predation is an important selective force acting on the use of algae by these animals.

Amphipods; food choice; habitat choice; predation refuge


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Publication Dates

  • Publication in this collection
    27 Jan 2015
  • Date of issue
    June 2013

History

  • Received
    15 Dec 2012
  • Accepted
    07 May 2013
Sociedade Brasileira de Carcinologia Instituto de Biociências, UNESP, Campus Botucatu, Rua Professor Doutor Antônio Celso Wagner Zanin, 250 , Botucatu, SP, 18618-689 - Botucatu - SP - Brazil
E-mail: editor.nauplius@gmail.com