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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
1994
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.758055 |
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| _version_ | 1867170459465809920 |
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| author | Andersen, Valérie Sardou, Jacques |
| author_facet | Andersen, Valérie Sardou, Jacques |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A large population of the colonial pelagic tunicate Pyrosoma atlanticum occurred in April 1991 in offshore waters of the Ligurian Sea (Northwestern Mediterranean). The high numbers of colonies caught allowed their vertical distribution and diel migration in the 0-965 m water column to be described as a function of their size. Daytime depths and amplitudes of the migration were correlated with colony size. The amplitude of the migration ranged from 90 m for 3-mm-length colonies to 760 m for 51-mm-length colonies, with a mean amplitude of 410 m for the whole population, all sizes pooled. The results of horizontal hauls at a given depth around sunrise and sunset showed a marked diurnal symmetry of the migratory cycle relative to noon, and that migration of the population was not cohesive. For example, the larger the colonies, the later after sunset they reached the upper layers during their upward migration. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_758055 |
| institution | PANGAEA |
| language | en |
| publishDate | 1994 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Distribution of macrozooplankton at time series station MIGZOO-4 Andersen, Valérie Sardou, Jacques Biogeochemical Processes in the Oceans and Fluxes; Georges Petit; JGOFS; Joint Global Ocean Flux Study; MIGZOO-4; Net; NET; PROOF; SESAME; Southern European Seas: Assessing and Modelling Ecosystem Changes A large population of the colonial pelagic tunicate Pyrosoma atlanticum occurred in April 1991 in offshore waters of the Ligurian Sea (Northwestern Mediterranean). The high numbers of colonies caught allowed their vertical distribution and diel migration in the 0-965 m water column to be described as a function of their size. Daytime depths and amplitudes of the migration were correlated with colony size. The amplitude of the migration ranged from 90 m for 3-mm-length colonies to 760 m for 51-mm-length colonies, with a mean amplitude of 410 m for the whole population, all sizes pooled. The results of horizontal hauls at a given depth around sunrise and sunset showed a marked diurnal symmetry of the migratory cycle relative to noon, and that migration of the population was not cohesive. For example, the larger the colonies, the later after sunset they reached the upper layers during their upward migration. |
| title | Distribution of macrozooplankton at time series station MIGZOO-4 |
| topic | Biogeochemical Processes in the Oceans and Fluxes; Georges Petit; JGOFS; Joint Global Ocean Flux Study; MIGZOO-4; Net; NET; PROOF; SESAME; Southern European Seas: Assessing and Modelling Ecosystem Changes |
| url | https://doi.org/10.1594/PANGAEA.758055 |