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首页> 外文期刊>Marine ecology progress series >Ontogenetic changes in vertical migratory rhythms of benthopelagic shrimps Pasiphaea multidentata and P. sivado
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Ontogenetic changes in vertical migratory rhythms of benthopelagic shrimps Pasiphaea multidentata and P. sivado

机译：底栖对虾Pasiphaea multidentata和P. sivado垂直迁徙节律的个体发育变化

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摘要

Vertical migratory rhythms of the western Mediterranean congeneric benthopelagic glass shrimps Pasiphaea sivado and P. multidentata were studied at depths of 400 to 430 m in relation to light intensity cycles (i.e. light regimes) in 2 different seasons: close to the autumn equinox (October) and to the summer solstice (June). Catches were considered a proxy of animal density close to the bottom and sampling was performed with consecutive epibenthic trawl hauls. These were continuously repeated over 4 d in order to determine the frequency and timing of species presence on the bottom. The density of animals present on the seabed at the time of the haul was estimated. In both P. sivado and P. multidentata marked diel differences in density were found which were correlated to variability in diel light intensity. While P. sivado was mostly captured at daytime in both seasons, regardless of size, P. multidentata only showed this pattern in the case of juveniles, i.e. individuals with carapace length < 30 mm. Adult P. multidentata were mainly present on the bottom during the night, thus showing an apparent phase inversion in their movement patterns. This modification of diel behaviour can be interpreted as the result of differential habitat use with size/age. The comparison of present results with previous field studies illustrates that while P. sivado and juvenile P. multidentata perform actual vertical migrations, adults of the latter species undertake epibenthic movements along the bottom.
机译：研究了地中海西部同类底栖玻璃虾Pasiphaea sivado和P. multidentata在两个不同季节与光强循环（即光照状态）有关的400至430 m深度的垂直迁徙节律：接近秋分点（10月）到夏至（六月）。捕捉被认为是接近底部的动物密度的代名词，并使用连续的上皮拖网牵引进行采样。为了确定物种在底部存在的频率和时间，在4天内连续重复这些步骤。估计拖运时海床上存在的动物的密度。在P. sivado和P. multidentata中，都发现了明显的密度差异，这些差异与diel光强度的变化有关。尽管在两个季节中无论大小如何，都在白天捕获到了P. sivado，但在幼年期，即甲壳长度＜30 mm的个体中，multidentata仅显示了这种模式。成年斑节对虾主要在夜间出现在底部，因此显示出它们运动方式的明显倒相。迪尔行为的这种改变可以解释为大小/年龄不同的栖息地使用的结果。目前的结果与以前的田间研究的比较表明，尽管西瓦多疟原虫和少年多齿疟原虫执行实际的垂直迁移，但后者的成虫沿底部进行了表皮运动。

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