Interdecadal and spatial variations of diet composition in horse mackerel Trachurus trachurus
2011; Wiley; Volume: 79; Issue: 7 Linguagem: Inglês
10.1111/j.1095-8649.2011.03148.x
ISSN1095-8649
Autores Tópico(s)Fish Ecology and Management Studies
ResumoJournal of Fish BiologyVolume 79, Issue 7 p. 2034-2042 Interdecadal and spatial variations of diet composition in horse mackerel Trachurus trachurus S. Garrido, Corresponding Author S. Garrido Guia Marine Laboratory, Centre of Oceanography, Faculty of Sciences, University of Lisbon, Av. de Nossa Senhora da Guia, 939, 2750-374 Cascais, Portugal Tel.: +351 214869211; email: [email protected]Search for more papers by this authorA. G. Murta, A. G. Murta Instituto Nacional dos Recursos Biológicos (INRB, I.P./IPIMAR), Avenida de Brasília, 1449-006 Lisboa, PortugalSearch for more papers by this author S. Garrido, Corresponding Author S. Garrido Guia Marine Laboratory, Centre of Oceanography, Faculty of Sciences, University of Lisbon, Av. de Nossa Senhora da Guia, 939, 2750-374 Cascais, Portugal Tel.: +351 214869211; email: [email protected]Search for more papers by this authorA. G. Murta, A. G. Murta Instituto Nacional dos Recursos Biológicos (INRB, I.P./IPIMAR), Avenida de Brasília, 1449-006 Lisboa, PortugalSearch for more papers by this author First published: 17 November 2011 https://doi.org/10.1111/j.1095-8649.2011.03148.xCitations: 11Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Interdecadal variability of the diet composition of horse mackerel Trachurus trachurus was examined through analysis of the stomach contents of fish collected from the north-west and south of Portugal during 1990–1992 and 2005–2006. These decades correspond to periods of high and low feeding intensity of T. trachurus. Dietary composition of adult T. trachurus was assessed by determining the frequency of occurrence and biovolume of identified prey, and these two variables were combined to estimate an index of relative importance of prey. Dietary composition differed between areas, seasons and, in particular, decades. The most important prey in 1990–1992 were euphausiids while in 2005–2006 the most important prey were fishes. Results show that periods of different feeding intensity for T. trachurus are characterized by diets with different dominant prey items, suggesting that a description of the diet of a fish species is not complete if only based on samples collected in a limited space and time period. This result has implications for the study of marine trophic food webs, since a generalist predator may easily and rapidly change its trophic niche, to adapt to different prey abundance and availability. References Cabral, H. N. & Murta, A. (2002). The diet of blue whiting, hake, horse mackerel and mackerel off Portugal. Journal of Applied Ichthyology 18, 14–23. De'ath, G. (2001). Multivariate regression trees: a new technique for modeling species-environment relationships. Ecology 83, 1105–1117. Edwards, M. & Richardson, A. (2004). Impact of climate change on marine pelagic phenology and trophic mismatch. Nature 430, 881–884. Garrido, S., Murta, A., Moreira, A., Ferreira, M. J. & Angélico, M. M. (2008). 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