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ICES Journal of Marine Science, 58: 633647. 2001 doi:10.1006/jmsc.2001.1052, available online at http://www.idealibrary.com on
 

Summary: ICES Journal of Marine Science, 58: 633­647. 2001
doi:10.1006/jmsc.2001.1052, available online at http://www.idealibrary.com on
Spatial patterns of groundfish assemblages on the continental
shelf of Portugal
Manuel C. Gomes, Ester Serra~o, and
Maria de Fa´tima Borges
Gomes, M. C., Serra~o, E., and Borges, M. F. 2001. Spatial patterns of groundfish
assemblages on the continental shelf of Portugal. ­ ICES Journal of Marine Science,
58: 633­647.
The analysis of catch data from groundfish surveys (1985­1988) conducted on the
Portuguese shelf and upper slope (20­500 m) revealed five major geographic areas,
each characterized by the presence of a typical fish assemblage. These areas of distinct
fish assemblages were found to be closely aligned with depth, in a way that resembles
spatial patterns previously described for other continental shelves in the North
Atlantic. The sharpest biological transition on the Portuguese shelf takes place as one
moves from areas shallower than 120 m (``Shallow Groups'') towards deeper locations
offshore (``Deep Groups''). Beyond the 150 m isobath, the biomass was dominated by
blue whiting, whereas inshore variability in assemblage composition was much greater.
Species such as sardine, horse mackerel, mackerel (to the north of Lisbon) and sparids
(to the south) comprised significant and highly variable proportions of the population

  

Source: Alberto, Filipe - Centro de Ciencias do Mar, Universidade do Algarve

 

Collections: Environmental Sciences and Ecology; Biology and Medicine