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Title

A comparative study of the feeding ecology of Nephrops norvegicus L. (Decapoda: Nephropidae) in the bathyal Mediterranean and the adjacent Atlantic

Other TitlesEstudio comparativo de la ecología trófica de Nephrops norvegicus L. (Decapoda: Nephropidae) en el Mediterráneo batial y en el Atlántico adyacente
AuthorsCristo, Margarida; Cartes, Joan Enric
KeywordsFeeding
Nephrops norvegicus
Diet
Alimentación
Dieta
Issue Date30-Dec-1998
PublisherConsejo Superior de Investigaciones Científicas (España)
CitationScientia Marina 62(S1): 81-90 (1998)
Abstract[EN] A comparative study of the feeding ecology of Nephrops norvegicus was carried out on a seasonal basis simultaneously in seven locations in the Eastern and Western Mediterranean and the adjacent Atlantic: the south coast of Portugal, Faro; the Alboran Sea, Malaga; the Catalan Sea, Barcelona; the Ligurian Sea, Genoa; theTyrrhenian Sea, Pisa; the Adriatic Sea, Ancona and the Aegean Sea, Gulf of Euboikos. The major groups observed (frequency of occurrence method) in the stomachs of Nephrops norvegicus were decapod crustaceans, other crustaceans (euphausids and peracarids) and fish. The results obtained showed no significant differences between sites or seasons, and can be considered very consistent. All major taxa were present in the diet at all sites and for all seasons, a fact that can be explained by the great similarity of the bathyal fauna in all sites, which provide a major trophic resource for N. norvegicus. The percentage of fullness was also estimated per site and season, and we registered a clear decrease of this value during the summer period for all sites, except the Tyrrheanian Sea, where the lowest value was found in autumn. PCA - analysis did not clearly separate the regions (sites). The Shannon-Weaver (H’), index of diversity, was also determined per site and season, and we found a significant difference between the values of the Atlantic coast and the Western Mediterranean when compared with those of the Eastern Mediterranean
[ES] Se llevó a cabo un estudio estacional comparativo de distintos aspectos de la ecología trófica de Nephrops norvegicus, simultáneamente en siete localidades del Mediterráneo Occidental y Oriental, así como en aguas atlánticas adyacentes: costa sur de Portugal, Faro; Mar de Alborán, Málaga; Mar Catalán, Barcelona; Mar Ligur, Genova; Mar Tirreno, Pisa; Mar Adriático, Ancona; Mar Egeo y el Golfo de Euboikos. Los grupos presa presentes con mayor frecuencia en la dieta de Nephrops norvegicus fueron crustáceos decápodos, otros crustáceos (eufausiáceos y peracáridos), así como peces. En los resultados obtenidos no se aprecian diferencias significativas entre localidades y estaciones anuales, lo cual puede explicarse por la elevada afinidad existente entre la fauna batial, que sirve de recurso trófico a N. norvegicus dentro de todas las localidades estudiadas. El porcentaje de repleción estomacal calculado para cada localidad y estación registra un claro descenso en verano para todas las localidades, excluyendo el Mar Tirreno. Para la diversidad de Shannon-Weaver (H’) se obtuvieron diferencias significativas entre los valores de la costa atlántica y Mediterráneo Occidental cuando fueron comparados con los de la cubeta oriental mediterránea
Description10 pages, 4 figures, 6 tables
Publisher version (URL)http://dx.doi.org/10.3989/scimar.1998.62s181
URIhttp://hdl.handle.net/10261/23387
DOI10.3989/scimar.1998.62s181
ISSN0214-8358
E-ISSN1886-8134
Appears in Collections:(ICM) Artículos
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