Ichthyofauna assemblages from two unexplored Atlantic seamounts: Northwest Bank and João Valente Bank (Cape Verde archipelago)

Pedro Monteiro; Daniel Ribeiro; José A. Silva; João Bispo; Jorge M.S. Gonçalves

doi:10.3989/scimar.2008.72n1133

Autores/as

Pedro Monteiro Universidade do Algarve
Daniel Ribeiro Universidade do Algarve
José A. Silva Atlantic Wildlife Association
João Bispo Atlantic Wildlife Association
Jorge M.S. Gonçalves Universidade do Algarve

DOI:

https://doi.org/10.3989/scimar.2008.72n1133

Palabras clave:

montes submarinos, censos subacuáticos, biogeografía, Macaronesia, Banco Noroeste, Banco João Valente, Cabo Verde

Resumen

Para estudiar las comunidades piscícolas, considerando las diferencias entre los montes submarinos en un contexto biogeográfico, fueron efectuados censos submarinos por buceo. Cincuenta y tres especies de 27 familias fueron registradas: 27 en el Banco Noroeste y 46 en el Banco João Valente. El Banco Noroeste fue caracterizado por bancos densos, mientras que el Banco João Valente presentó mayor riqueza de especies y bancos más pequeños. Ambos montes fueron dominados principalmente por especies costeras que dependen directamente del hábitat del lecho submarino (Demersal o bentopelágicos). De las 53 especies de peces registradas, 22.6% fueron de origen africano continental, mientras que 9.4% y 5.7% fueron endemias de las Islas de Cabo Verde y de la provincia Macaronesia, respectivamente. La mayoría de las especies tienen una distribución biogeográfica muy amplia (64.2%): cosmopolita (22.6%), amphi-atlántico (28.3%) y con una distribución atlántico-mediterránea (13.2%). Los Bancos Noroeste y João Valente deben tener una comunidad permanente de peces, sostenida por fenómenos oceanográficos. El Banco João Valente parece más diverso, hecho asociado probablemente con un área mayor, proporcionando hábitats adicionales, más propicios y variados. La presencia de especies oceánicas y/o oceanódromas y la proximidad geográfica a la costa, sugiere que la parte superior de estos montes puede actuar como punto de atracción y como “stepping-stones” para la dispersión de especies costeras.

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