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The near-bottom distribution of the Genus Boreomysis (Crustacea: Mysidacea) in the Porcupine Seabight, North-eastern Atlantic
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Abstract(s)
Descreve-se a distribuição vertical próxima do fundo de oito espécies de misidáceos do género Boreomysis (Crustacea) sobre zonas de vertente do "Porcupine Seabight" no Atlântico nordeste. Os números de indivíduos de Boreomysis foram maiores entre os 300 m e os 1000 m, excedendo 100 indivíduos por 1000 m3 em três arrastos a 400-500 m e, 60 indivíduos por 100 m3 a 500-1300 m. Abaixo dos 1300 m o número de indivíduos decresce rapidamente até ao limite de amostragem, a 3800 m. Entre os níveis batimétricos de 300-1300 m cada uma das três espécies suprabênticas de Boreomysis numericamente dominantes tende a ocupar diferentes estratos óptimos de profundidade, a 400-520 m, 700-950 m e 520-1330 m respectivamente, embora haja ligeira sobreposição na distribuição. Em contraste, quatro espécies de Boreomysis que vivem a maior profundidade ocorreram intermitentemente próximas do fundo em "Seabight", nos níveis de profundidade de 1300-1400 m. Discute-se a distribuição das espécies numa vasta área no Atlântico nordeste temperado.
ABSTRACT: The near-bottom vertical distribution of eight species of the mysid genus Boreomysis (Crustacea) over slope areas of the Porcupine Seabight in the North-eastern Atlantic is described. The numbers of Boreomysis individuals were greatest between 300 m and 1000 m, exceeding 100 per 1000 m3 in three hauls at 400-500 m and 60 per 1000 m3 at 500-1300 m. Below 1300 m numbers decreased rapidly down to the limit of sampling at approximately 3800 m. Within the bathymetric range 300-1300 m each of three numerically dominant suprabenthic Boreomysis species, tended to occupy different optimum depth strata at 400-520 m, 700-950 m and 520-1330 m respectively but overlapped slightly in distribution. In contrast four deeper-living Boreomysis species occurred intermittently nearbottom in the Seabight in the bathymetric range 1300-4000 m. Species distribution over a wide area of the temperate North-eastern Atlantic is discussed.
ABSTRACT: The near-bottom vertical distribution of eight species of the mysid genus Boreomysis (Crustacea) over slope areas of the Porcupine Seabight in the North-eastern Atlantic is described. The numbers of Boreomysis individuals were greatest between 300 m and 1000 m, exceeding 100 per 1000 m3 in three hauls at 400-500 m and 60 per 1000 m3 at 500-1300 m. Below 1300 m numbers decreased rapidly down to the limit of sampling at approximately 3800 m. Within the bathymetric range 300-1300 m each of three numerically dominant suprabenthic Boreomysis species, tended to occupy different optimum depth strata at 400-520 m, 700-950 m and 520-1330 m respectively but overlapped slightly in distribution. In contrast four deeper-living Boreomysis species occurred intermittently nearbottom in the Seabight in the bathymetric range 1300-4000 m. Species distribution over a wide area of the temperate North-eastern Atlantic is discussed.
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Keywords
Boreomysis Atlântico Nordeste North-eastern Atlantic
Citation
"ARQUIPÉLAGO. Ciências Biológicas e Marinhas = Life and Marine Sciences". ISSN 0873-4704. Nº 15A (1997): 51-64