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Spring rotifer community structure in the Alcantara River (Sicily, Italy), using different mesh size nets: relation to environmental factors

Published online by Cambridge University Press:  14 November 2013

Lina Pilar Rodríguez ,
Antonia Granata ,
Letterio Guglielmo ,
Roberta Minutoli ,
Giacomo Zagami  and
Cinzia Brugnano
Lina Pilar Rodríguez
Affiliation:
Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31 S. Agata, Messina 98166, Italy
Antonia Granata
Affiliation:
Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31 S. Agata, Messina 98166, Italy
Letterio Guglielmo
Affiliation:
Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31 S. Agata, Messina 98166, Italy
Roberta Minutoli
Affiliation:
Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31 S. Agata, Messina 98166, Italy
Giacomo Zagami
Affiliation:
Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31 S. Agata, Messina 98166, Italy
Cinzia Brugnano*
Affiliation:
Department of Biological and Environmental Sciences, University of Messina, Viale Ferdinando Stagno d'Alcontres, 31 S. Agata, Messina 98166, Italy
*
*Corresponding author: [email protected]
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Abstract

The present study focus on some aspects of zooplankton structure in the Alcantara River (Sicily, Italy), in relation to environmental factors. Zooplankton samplings were performed in spring in four sites, located from up- to downstream along the river course. Four low-flow velocity station points were chosen along a transversal river section in each site. Samples were taken from all station points in the four sites by two different mesh sizes (55 and 100 μm) rectangular nets. Rotifer abundances were an order of magnitude higher in 55 μm mesh size samples than in 100 μm mesh size ones. The two communities also resulted significantly different (ANOSIM test, ρ=0.212; P=0.1%). Generally, low abundances (from 3470±5133 to 422±474 ind.m−3) were explained by low chlorophyll a concentration and the high-flow regime of this river. Rotifer dominated the zooplankton community. Cladocerans, copepods and nauplii occurred with considerably lower abundances than rotifers. However, the relative contributions of these taxa to total abundances depended on the mesh sizes used. Euchlanis and Adineta genera exhibited the highest abundances in the rotifer assemblage. Conductivity alone or in association with temperature and dissolved oxygen was the most important environmental factor affecting rotifer community distribution. Cephalodella sp., Lepadella sp. and Trichotria pocillum showed a high positive relation to pico-plankton, showing this fraction as a possible rotifer food item. This paper demonstrated a higher efficiency of the finest net to characterize riverine zooplankton community that increases from up to downstream in terms of abundances and diversity.

Keywords

Zooplanktonnet selectionabundance and diversityfreshwater ecosystem
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 49 , Issue 4 , 2013 , pp. 287 - 300
Copyright
© EDP Sciences, 2013

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