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Ichthyofauna assemblages from two unexplored Atlantic seamounts: Northwest Bank and João Valente Bank (Cape Verde archipelago)
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Orientador(es)
Resumo(s)
Underwater censuses by divers were used to study the fish assemblages from two unexplored Atlantic
seamounts in the Cape Verde archipelago. Fifty three species of 27 families were recorded: 27 in Northwest Bank and
46 in João Valente Bank. Northwest Bank had dense schools, while João Valente Bank had higher species richness and
smaller schools. Both seamounts were dominated mainly by coastal species directly depending on seabed habitat (Demersal
or benthopelagic). Of the 53 fish species recorded, 22.6% were of continental African origin, while 9.4% and 5.7% were
endemic of the Cape Verde Islands and of the Macaronesia province, respectively. Most species (64.2%) had a very wide
biogeographic distribution: cosmopolitan (22.6%), amphi-Atlantic (28.3%) and Atlantic-Mediterranean (13.2%). Northwest
Bank and João Valente Bank may have a permanent fish community supported by various oceanographic-topographic
interactions. João Valente Bank seems more diverse, which is probably associated with algae cover and with a larger area
providing additional suitable and more varied habitats. The geographic proximity to the coast and the presence of oceanic
and/or oceanodromous species suggests that the upper part of these seamounts may act both as attraction points and as
“stepping-stones” for the dispersal of coastal species.
Descrição
Palavras-chave
Seamounts Underwater surveys Biogeography Macaronesia Northwest Bank João Valente Bank Cape Verde
Contexto Educativo
Citação
Editora
Consejo Superior de Investigaciones Científicas