Ontogenetic and seasonal changes in diel vertical migration amplitude of the calanoid copepods Eurytemora affinis and Acartia spp. in a coastal area of the northern Baltic proper
Ontogenetic and seasonal changes in diel vertical migration amplitude of the calanoid copepods Eurytemora affinis and Acartia spp. in a coastal area of the northern Baltic proper
复制标题
桡足类Eurytemora affinis和Acartia spp的昼夜垂直迁移幅度的个体发生和季节变化。
DOI：
10.1093/plankt/fbs001
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发表时间：
2012
影响因子：
2.1
通讯作者：
S. Hansson
中科院分区：
文献类型：
--
作者：
Per B. Holliland;I. Ahlbeck;Erica Westlund;S. Hansson
我们研究了波罗的海最丰富的两种甲壳类浮游动物——类鱿鱼桡足类Eurytemora affinis和Acartia spp的六个桡足类阶段的双垂直迁移（DVM），研究于5月至10月在波罗的海西北部的一个海湾进行。鱼类生物量、浮游植物丰度和温度与浮游动物取样一起得到。两种桡足动物都进行了DVM。除雌性外，所有阶段的迁徙都在10 m以上，只有在桡足期略有增加。成年雌鸟停留在深水处，夜间只轻微向上移动。在Acartia spp中，DVM振幅随阶段和大小的增加而增加，表明其行为发生了个体发生的转变；尽管它们的DVM不像E. affinis那么明显。尽管DVM振幅随大小而增加，表明了视觉捕食，但鱼类生物量与DVM振幅无关。然而，鱼在整个研究期间都存在。我们推测，这些个体发生的行为变化是由于体型增加，因此对捕食者的可见性，而物种之间DVM的差异很可能是生理差异和生殖策略的结果。
We studied diel vertical migration (DVM) of the six copepodite stages of two of the most abundant crustacean zooplankton in the Baltic Sea, the calanoid copepods Eurytemora affinis and Acartia spp. The study was conducted monthly from May through October in a bay in the northwestern Baltic proper. Fish biomass, phytoplankton abundance and temperature were obtained in conjunction with the zooplankton sampling. Both copepod species performed DVM. With the exception of females, all E. affinis copepodite stages performed migrations of over 10 m with only a slight increase with the copepodite stage. Adult female E. affinis remained at depth with only slight upward movement at night. In Acartia spp., DVM amplitude increased with stage and size, suggesting an ontogenetic shift in behaviour; although they had a less pronounced DVM than E. affinis. Although DVM amplitude increased with size, indicative of visual predation, fish biomass did not correlate with the amplitude of DVM. However, fish were present throughout the study period. We surmise that these ontogenetic shifts in behaviour are due to size increase and therefore visibility to predators and that the difference in DVM between the species may well be a result of physiological differences and reproductive strategy.