Correlation between photosensitivity and downwelling irradiance in mesopelagic crustaceans
Correlation between photosensitivity and downwelling irradiance in mesopelagic crustaceans
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DOI：
10.1007/s00227-005-1606-9
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发表时间：
2005-07-01
期刊：
影响因子：
2.4
通讯作者：
Widder, E
中科院分区：
文献类型：
--
作者：
Myslinski, T;Frank, T;Widder, E
本研究测定了三种中层甲壳动物的行为和电生理光敏感性：多齿帕西菲阿（PasiphaeamultidentataEsmark，1866）（十足目：帕西菲阿科），北极蛇尾虾（Sergestesarcticus Kroyer，1855）（十足目：蛇尾虾科），和Meganyctiphanesnorvegica M。Sars，1857（磷虾科：磷虾科）。此外，在原位quanti。在西北大西洋的两个地点，威尔金森盆地（WB）和海洋学家峡谷（OC）也确定了物种垂直分布与下降流辐照度的关系。数据来自1995年至2001年6月至9月期间的6次为期2周的巡航。P. multidentata和M. norvegica是WB最丰富的大型甲壳动物，S. arcticus和M. norvegica是OC最丰富的大型甲壳动物。结果表明，多齿拟步行虫和多齿拟步行虫的行为光敏感阈值分别为：norvegica和S. arcticus和M. norvegica和OC的平均辐射强度均为10 8 photons cm（-2）s（-1）。电生理上，多齿原螯虾比M. norvegica，S. arcticus的敏感性显著高于M. norvegica和M. WB中的褐家鼠比M.挪威OC.电生理测量的光敏性和下行流辐照度之间存在相关性，其中最敏感的物种是多齿拟步行虫和S。arcticus，与白天深度的最低辐照度有关。测定了M.从较清澈的沃茨中采集的褐家鼠的个体数显著低于从较浑浊的WB沃茨中采集的个体数。这些结果表明，下降流辐照度有显着的影响种间和种内的垂直分布格局在中层领域。
The current study determined behavioral and electrophysiological photosensitivities for three species of mesopelagic crustaceans: Pasiphaea multidentata Esmark, 1866 (Decapoda: Pasiphaeidae), Sergestes arcticus Kroyer, 1855 (Decapoda: Sergestidae), and Meganyctiphanes norvegica M. Sars, 1857 (Euphausiacea: Euphausiidae). In addition, in situ quanti. cations of the species' vertical distributions in relation to downwelling irradiances were also determined in two locations in the northwest Atlantic Ocean, Wilkinson Basin (WB) and Oceanographer Canyon (OC). Data are from six 2-week cruises between June and September from 1995 to 2001. P. multidentata and M. norvegica were the most abundant large crustaceans in WB, and S. arcticus and M. norvegica were the most abundant large crustaceans in OC. The behavioral light sensitivity thresholds of P. multidentata and M. norvegica from WB were both 10 7 photons cm(-2) s(-1) and those of S. arcticus and M. norvegica from OC were both 10 8 photons cm(-2) s(-1). Electrophysiologically, P. multidentata was significantly more sensitive than M. norvegica from either location, S. arcticus was significantly more sensitive than M. norvegica from OC, and M. norvegica from WB was significantly more sensitive than M. norvegica from OC. A correlation was found between electrophysiologically measured photosensitivity and downwelling irradiance, with the most sensitive species, P. multidentata and S. arcticus, associated with the lowest irradiance at daytime depths. The photosensitivities of M. norvegica collected from the clearer waters of OC were significantly lower than those of individuals collected from the more turbid WB waters. These results indicate that downwelling irradiance has a significant impact on interspecies and intraspecies vertical distribution patterns in the mesopelagic realm.