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Abstract(s)
Temporal variation in a temperate cryptobenthic ¢sh assemblage at the Arra¤bida Marine Park
(Portugal) was assessed by visual surveys during 2002 and 2003. A total of 9596 ¢sh from 11 families and
30 species was recorded. There were no changes in structure or density at the assemblage level between
years, whereas diversity changed signi¢cantly due to a higher number of abundant species in the second
year. A similar seasonal trend was found between years, with a signi¢cant overall density increase in
autumn. This is partially explained by the arrival of new recruits of some of the most abundant species in
the assemblage. Assemblage diversity and structure also changed across seasons. A group of species encompassing
Gobius xanthocephalus,Tripterygion delaisi, Parablennius pilicornis, Gobius paganellus, Lepadogaster candollii
and Lepadogaster spp. were analysed in detail. The temporal patterns of two of the most abundant species,
G. xanthocephalus and T. delaisi, mimicked the overall temporal patterns of the assemblage.We suggest that
the inter-annual stability in density of this subtidal ¢sh assemblage may be similar to what has been
reported for the intertidal and that strong post-settlement processes are probably shaping this assemblage.
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Citation
Journal of the Marine Biological Association of the United Kingdom, 86, 1221-1228