PYROSOMA-ATLANTICUM (TUNICATA, THALIACEA) - DIEL MIGRATION AND VERTICAL-DISTRIBUTION AS A FUNCTION OF COLONY SIZE
PYROSOMA-ATLANTICUM (TUNICATA, THALIACEA) - DIEL MIGRATION AND VERTICAL-DISTRIBUTION AS A FUNCTION OF COLONY SIZE
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DOI：
10.1093/plankt/16.4.337
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发表时间：
1994-04-01
影响因子：
2.1
通讯作者：
SARDOU, J
中科院分区：
文献类型：
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作者：
ANDERSEN, V;SARDOU, J
1991年4月，在利古里亚海（地中海西北部）的近海沃茨发生了大量的殖民地远洋被囊动物大西洋Pyrosoma atlanticum。捕获的大量菌落使它们在0-965米水柱中的垂直分布和昼夜迁移被描述为它们的大小的函数。白天的深度和幅度的迁移与殖民地的大小。迁移的幅度范围从3 mm长菌落的90 m到51 mm长菌落的760 m，整个种群的平均幅度为410 m，所有大小合并。水平牵引在一个给定的深度约日出和日落的结果表明，一个显着的昼夜对称的迁移周期相对于中午，人口的迁移是没有凝聚力。例如，殖民地越大，日落后他们到达上层的时间越晚。
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.