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Tidal activity rhythms and depth distribution of rocky shore fish in an altered intertidal environment
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Orientador(es)
Resumo(s)
In this note we report on changes of activity level
of littoral fish and their use of different microhabitats in an
altered intertidal environment, where intertidal fish are
never emersed and turbulence is confined to high tides.
Despite these atypical conditions, the structure of the
assemblage is basically the same found in a typical rockyshore
situation. Two intertidal fish known to possess
internal tidal rhythms, Lipophrys pholis and Coryphoblennius
galerita, retain those rhythms in these altered conditions, and
the associated social changes in L. pholis are also retained.
These observations support the studies of Gibson (1971),
who showed that changes in hydrostatic pressure were of
prime importance in keeping the tidal rhythm entrained. The
subtidal Parablennius pilicornis, on the contrary, is more
active during low tide than at high tide. The hypothesis that
some subtidal species are excluded from the intertidal by a
turbulence-avoiding mechanism is discussed.
Descrição
Palavras-chave
Tidal rhythms Rocky-shore fish Depth distribution Blenniidae
Contexto Educativo
Citação
Acta Ethologica, 11, 123-126