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首页> 外文期刊>Marine ecology progress series >Diel vertical migration of decapod larvae in the Portuguese coastal upwelling ecosystem: implications for offshore transport
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Diel vertical migration of decapod larvae in the Portuguese coastal upwelling ecosystem: implications for offshore transport

机译：葡萄牙沿海上升流生态系统中十足纲幼虫的Diel垂直迁移：对近海运输的影响

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The vertical distribution of decapod larvae off the northwest Portuguese coast was analysed in relation to associated environmental conditions from sampling during a 69 h period around a current meter mooring located on the shelf, approximately 21 km off the coast. Plankton samples were collected every 2 h at the surface with a neuston net and through the water column with a Longhurst Hardy Plankton Recorder (Pro-LHPR), allowing a very detailed resolution of larval vertical distribution. Environmental data (temperature, salinity, and chlorophyll a) were obtained every hour. To investigate the horizontal distribution of decapod larvae in relation to the coast, a plankton-sampling grid was carried out before the 69 h fixed station. Larvae of shelf decapod species were widely distributed over the shelf, while those of inshore species were found much closer to the coast. Decapod larvae (zoeae and megalopae) showed clear diel vertical migrations, only appearing in the upper 20 m at night, a migration that did not appear to be affected by physical conditions in the water column. Larval densities were highly variable, 0.01 to 215 ind. m~(-3) for zoeae and 0 to 93 ind. m~(-3) for megalopae, the zoeae being generally more abundant. The results indicated that during the day larvae accumulate very close to the bottom. The diel vertical migration behaviour is discussed as one of the contributing mechanisms for larval retention over the shelf, even with offshore transport conditions promoted by coastal upwelling, and is hence of major relevance for the recruitment success of decapod species that inhabit inshore and shelf zones of coastal upwelling systems.
机译：分析了葡萄牙西北海岸外十足类幼虫的垂直分布，并与相关的环境条件进行了相关分析，这些环境条件是在距海岸约21公里的架子上的当前水表系泊器周围69小时内进行的采样过程中进行的。浮游生物样品每2小时用神经网络在地表收集一次，并通过Longhurst Hardy浮游生物记录仪（Pro-LHPR）通过水柱进行收集，从而可以非常详细地解析幼虫的垂直分布。每小时获取一次环境数据（温度，盐度和叶绿素a）。为了调查十足动物幼虫相对于海岸的水平分布，在69 h固定站之前进行了浮游生物采样网格。架子十足动物的幼虫广泛分布在架子上，而近岸物种的幼虫则被发现更靠近海岸。十足纲幼虫（斑足纲和巨鳍纲）显示出明显的diel垂直迁移，仅出现在夜间的20 m以上，这种迁移似乎不受水柱物理条件的影响。幼虫密度变化很大，从0.01到215 ind。 zoeae为m〜（-3），ind为0至93。巨lop的m〜（-3），动物一般更丰富。结果表明，白天幼虫非常靠近底部积聚。 diel垂直迁移行为被讨论为是将幼体保留在架子上的一种促成机制之一，即使在沿海上升带动了近海运输条件的情况下，也因此与居住在该地区近岸和架子区域的十足动物的成功招募有着重要的关系。沿海上升流系统。

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