Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons
Diurnal variations and geographic distribution of zooplankton and micronekton are studied in the Angola Dome. The small zooplankton species (Copepodids, Copepods, Amphipods, Ostracods, Chaetognaths, etc.) undertake vertical migrations within a 100 m water layer. Most of the micronekton species are below this layer during the day and move towards the surface during the night. The whole region prospected is rich in zooplankton and micronekton species that are present in the upper 100 m layer during the day. Only the South-West region is poor. On the contrary, this latter region is abundant in species that migrate below this layer during the day. The authors think there are 3 main difficulties in establishing good relationships between micronekton and tunas distribution: 1 - inability of micronekton nets to catch the tunas preys; 2 - the great diversity of tunas food; and 3 - the too large delay between micronekton studies and those of stomach contents of tunas.
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Format: | article biblioteca |
Language: | French |
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1973-06
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Subjects: | Biology, Ecology, Oceanography, Angola Dome, zooplankton, micronecton, tuna fish, |
Online Access: | http://hdl.handle.net/1834/24825 |
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dig-aquadocs-1834-248252021-06-28T01:51:59Z Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons Zooplankton and micronekton in the Angola Dome region in February-March 1971 and their relationship with tunas Herbland, A. Stretta, J.M. Biology Ecology Oceanography Angola Dome zooplankton micronecton tuna fish Diurnal variations and geographic distribution of zooplankton and micronekton are studied in the Angola Dome. The small zooplankton species (Copepodids, Copepods, Amphipods, Ostracods, Chaetognaths, etc.) undertake vertical migrations within a 100 m water layer. Most of the micronekton species are below this layer during the day and move towards the surface during the night. The whole region prospected is rich in zooplankton and micronekton species that are present in the upper 100 m layer during the day. Only the South-West region is poor. On the contrary, this latter region is abundant in species that migrate below this layer during the day. The authors think there are 3 main difficulties in establishing good relationships between micronekton and tunas distribution: 1 - inability of micronekton nets to catch the tunas preys; 2 - the great diversity of tunas food; and 3 - the too large delay between micronekton studies and those of stomach contents of tunas. 2021-06-24T16:16:32Z 2021-06-24T16:16:32Z 1973-06 article http://hdl.handle.net/1834/24825 fr application/pdf application/pdf 45-70 http://aquaticcommons.org/id/eprint/8019 424 2012-03-08 12:37:42 8019 Centre de Recherches Océanographiques, Côte d'Ivoire |
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Biology Ecology Oceanography Angola Dome zooplankton micronecton tuna fish Biology Ecology Oceanography Angola Dome zooplankton micronecton tuna fish |
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Biology Ecology Oceanography Angola Dome zooplankton micronecton tuna fish Biology Ecology Oceanography Angola Dome zooplankton micronecton tuna fish Herbland, A. Stretta, J.M. Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons |
description |
Diurnal variations and geographic distribution of zooplankton and micronekton are studied in the Angola Dome. The small zooplankton species (Copepodids, Copepods, Amphipods, Ostracods, Chaetognaths, etc.) undertake vertical migrations within a 100 m water layer. Most of the micronekton species are below this layer during the day and move towards the surface during the night. The whole region prospected is rich in zooplankton and micronekton species that are present in the upper 100 m layer during the day. Only the South-West region is poor. On the contrary, this latter region is abundant in species that migrate below this layer during the day. The authors think there are 3 main difficulties in establishing good relationships between micronekton and tunas distribution: 1 - inability of micronekton nets to catch the tunas preys; 2 - the great diversity of tunas food; and 3 - the too large delay between micronekton studies and those of stomach contents of tunas. |
format |
article |
topic_facet |
Biology Ecology Oceanography Angola Dome zooplankton micronecton tuna fish |
author |
Herbland, A. Stretta, J.M. |
author_facet |
Herbland, A. Stretta, J.M. |
author_sort |
Herbland, A. |
title |
Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons |
title_short |
Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons |
title_full |
Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons |
title_fullStr |
Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons |
title_full_unstemmed |
Zooplancton et micronecton dans la région du Dôme d'Angola en février-mars 1971 et rélation avec les thons |
title_sort |
zooplancton et micronecton dans la région du dôme d'angola en février-mars 1971 et rélation avec les thons |
publishDate |
1973-06 |
url |
http://hdl.handle.net/1834/24825 |
work_keys_str_mv |
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