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First record of sympagic hydroids (Hydrozoa, Cnidaria) in Arctic coastal fast ice

机译：北极沿海速生冰中的共生性水合物（Hydrozoa，Cnidaria）的首次记录

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摘要

We report on the first record of interstitial cnidarians in sea ice. Ice core samples were collected during eight field periods between February 2003 and June 2006 in the coastal fast ice off Barrow, Alaska (71°N, 156°W) at four locations. A total of 194 solitary, small (0.2-1.1 mm) elongated specimens of a previously unknown interstitial hydroid taxon were found. By cnidome composition and the occurrence of a highly retractable pedal disc formed by epidermal tissue only, the specimens are tentatively assigned to representatives of the family Protohydridae, subclass Anthomedusae. The hydroids were found almost exclusively in the bottom 10 cm-layer (at the ice-water interface) of 118 ice cores, with abundances ranging from 0 to 27 individuals per core section (0-4,244 ind m~(-2)) and a grand mean of 269 ind m~(-2) in bottom 10 cm-layer sections. Abundances were lower in December and late May than in months in between with considerable site variability. A factor analysis using 12 variables showed that hydroid abundance correlated highest with abundances of copepod nauplii and polychaete juveniles suggesting a trophic relationship.
机译：我们报道了海冰间质刺胞的首次记录。在2003年2月至2006年6月的八个野外时期，在阿拉斯加巴罗（71°N，156°W）的四个地点的沿海快速冰中采集了冰芯样本。总共发现了194个以前未知的间隙水状类群的单个小（0.2-1.1毫米）细长标本。通过刺突的组成和仅由表皮组织形成的高度可伸缩的踏板的出现，将这些标本暂定分配给原蝇科（Anthomedusae）的代表。几乎在118个冰芯的底部10厘米层（在冰水界面处）都发现了这种类水体，每个岩心截面的丰度范围为0到27个人（0-4,244 ind m〜（-2）），并且底部10 cm层剖面的平均值为269 ind m〜（-2）。 12月和5月下旬的丰度低于几个月之间的丰度，且地点之间存在很大差异。使用12个变量进行的因子分析表明，与pe足无节幼体和多毛ju幼体的丰度相关的水份丰度最高，表明存在营养关系。

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