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Sponge assemblages and predicted archetypes in the eastern Canadian Arctic

机译：加拿大东部北极地区的海绵组合和预测的原型

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Little information exists on the environmental requirements of sponges from the Canadian Arctic, increasing the necessity to establish baseline distribution data on sponge as semblages to predict their susceptibility to climate change. Here we describe the sponge taxa of Hudson Strait, Ungava Bay, Western Davis Strait and Western Baffin Bay collected by Canadian research vessel trawl surveys. A total of 2026 sponge specimens were examined, and 93 different taxa were identified with 79% identified to species, of which 2 are new to science, 1 recorded for the first time in the North Atlantic, 16 are new records for the northwest Atlantic, and 10 are new records for the Baffin Bay, Davis Strait and Hudson Strait sponge fauna. Taxonomic distinctness was higher north of Cape Dyer and south of Davis Strait, whereas the number of species reached a maximum in Davis Strait, which represents the southern distribution limit of the arctic sponge fauna along the slope in this region. Five sponge species assemblages were identified, some of which have been observed elsewhere, suggesting that they may be common to the North Atlantic and at the generic level to the global oceans. Two of the Baffin Bay-Davis Strait assemblages were characterized by large structure-forming astrophorids: one, with arctic species, found at midwater depths in Baffin Bay and the other, characterized by boreal species, was found deeper, south of Davis Strait. Another assemblage characterized by glass and carnivorous sponges was found along the continental slope of western Baffin Bay. Candidate target indicator species are provided for future sponge community monitoring.
机译：加拿大北极对海绵的环境要求知之甚少，这增加了建立有关海绵的基线分布数据以预测其对气候变化敏感性的必要性。在这里，我们描述了加拿大研究船拖网调查收集的哈德逊海峡，翁加瓦湾，西戴维斯海峡和西巴芬湾的海绵类群。总共检查了2026个海绵标本，确定了93个不同的分类单元，其中79％的物种被识别，其中2个是科学新发现的，1个是北大西洋第一次记录的，16个是西北大西洋的新记录，还有10条是巴芬湾，戴维斯海峡和哈德逊海峡海绵动物区系的新记录。分类学上的区别在戴尔角以北和戴维斯海峡以南更高，而物种数量在戴维斯海峡达到了最大值，这代表了该地区斜坡上北极海绵动物区系的南部分布极限。确定了五种海绵物种组合，其中一些在其他地方观察到，表明它们可能是北大西洋和全球海洋通用的物种。巴芬湾-戴维斯海峡的两个组合以形成大结构的星形胶体为特征：一个在北极巴芬湾中水深处发现有北极物种，另一个在北戴维斯海峡的深处发现有北冰洋物种。在巴芬湾西部的陆坡上发现了另一种以玻璃和食肉海绵为特征的组合。提供了候选目标指标物种，以用于未来的海绵群落监测。

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