Journal Article

The effect of coastal topography on the spatial structure of anchovy and sardine

Marianna Giannoulaki, Athanassios Machias, Constantin Koutsikopoulos and Stylianos Somarakis

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 63, issue 4, pages 650-662
Published in print January 2006 | ISSN: 1054-3139
Published online January 2006 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2005.10.017
The effect of coastal topography on the spatial structure of anchovy and sardine

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Acoustic-survey data from 1995 to 2004 (six acoustic surveys in summer and two in winter) in the Aegean and Ionian Seas (eastern Mediterranean Sea) were analysed to investigate the spatial organization of European anchovy and European sardine populations. The potential effect of certain topographic characteristics (e.g. area, bottom depth, and the degree of land enclosure) on the spatial structure of the fish was studied in different geographic subareas (i.e. how topography affects the organization of fish into clusters of schools). Parameters calculated by geostatistical techniques were used as descriptors of the spatial organization. The results indicate the significant effect of area and land enclosure on the spatial structures of both species, suggesting that environmental spatial heterogeneity attributable to coastal topography affected the way fish schools were organized into aggregations. In summer, the spatial structure of sardine was more heterogeneous in subareas with increased land enclosure, whereas the spatial structure of anchovy was not significantly related to any of the area characteristics examined. In winter, the spatial structure of both species was more heterogeneous in subareas with increased enclosure and in small rather than larger subareas. The findings are discussed in terms of the species' response to their environment.

Keywords: anchovy; coastal topography; exhaustive variograms; geostatistics; land enclosure; sardine

Journal Article.  5439 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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