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首页> 外文期刊>Marine biology >Life cycle of Pseudocalanus acuspes Giesbrecht (Copepoda, Calanoida) in the Central Baltic Sea: I. Seasonal and spatial distribution
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Life cycle of Pseudocalanus acuspes Giesbrecht (Copepoda, Calanoida) in the Central Baltic Sea: I. Seasonal and spatial distribution

机译：波罗的海中部假单胞菌Giesbrecht（Calopoda，Calanoida）的生命周期：I.季节性和空间分布

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摘要

The seasonal and spatial distribution of Pseudocalanus acuspes in the Bornholm Basin (Central Baltic Sea) was studied on 16 cruises between March 2002 and May 2003 from stratified (10 m) multinet samples. The highest abundances were reached in May 2002 and April 2003 (618 x 10~3 and 869 x 10~3 ind. m~(-2), respectively). Ontogenetic vertical distribution was stage specific with differences of mean annual weighted mean depth > 30 m between nauplii and males; it followed closely the hydrography which was characterized by a permanent halocline and a summer thermocline. The vertical distribution showed a positive correlation with salinity especially in the older developmental stages; the relationship to temperature was negative in the nauplii and copepodite stage I (CI). Most of the stages performed a seasonal migration. The consequences of the vertical distribution patterns in relation to the effects of climate and predation are discussed. A stage shift from nauplii in April/May to CIV and CV as overwintering stages indicated slow seasonal development. However, nauplii were observed all the year round, and the resulting stage structure did not allow to distinguish generations. Changes in the prosome length of females seemed to be related to the advection of water masses with different temperatures rather than to different generations. It could not be clarified whether the strong increase of nauplii and adults after an inflow event of cold, saline North Sea water in the beginning of 2003 was a result of advection or improvement in habitat conditions.
机译：在2002年3月至2003年5月之间的16次航行中，使用分层的（10 m）多网样本研究了博恩霍尔姆盆地（中波罗的海）假尾猿的季节和空间分布。 2002年5月和2003年4月达到最高丰度（分别为618 x 10〜3和869 x 10〜3 ind。m〜（-2））。个体发育的垂直分布是阶段性的，无节幼体和雄性的年平均加权平均深度> 30 m的差异；它紧跟着以永久性盐环和夏季温跃线为特征的水文学。垂直分布与盐度呈正相关，特别是在较早的发育阶段。在无节幼体和copopodite I期（CI），与温度的关系为负。大多数阶段都进行了季节性迁移。讨论了垂直分布模式与气候和捕食相关的后果。从四月/五月的无节幼体过渡到CIV和CV，因为越冬阶段表明季节发展缓慢。然而，一年四季都观察到无节幼体，并且所形成的阶段结构无法区分世代。雌性体长的变化似乎与温度不同的水团的平流有关，而不是与不同的世代有关。目前尚不清楚，2003年初北冰冷，咸水的流入导致无节幼体和成虫的大量增加是平流或栖息地条件改善的结果。

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