Annelid Fauna of the Prince Gustav Channel, a Previously Ice-Covered Seaway on the Northeastern Antarctic Peninsula
Annelid Fauna of the Prince Gustav Channel, a Previously Ice-Covered Seaway on the Northeastern Antarctic Peninsula
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DOI：
10.3389/fmars.2020.595303
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
R. Drennan;T. Dahlgren;K. Linse;A. Glover
中科院分区：
文献类型：
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作者：
R. Drennan;T. Dahlgren;K. Linse;A. Glover
古斯塔夫王子海峡是一条狭窄的海道，位于南极半岛最东北端的威德尔海西部。该水道以其深（约1200米）的盆地和动态的冰川历史而闻名，最近的冰川历史包括古斯塔夫王子冰架的破裂，该冰架覆盖了该水道的南部，直到1995年崩溃。然而，该海峡大部分仍未采样，对其底栖生物知之甚少。我们对古斯塔夫王子海峡的底栖动物动物群进行了初步的描述，并提供了来自杜斯湾的样本，杜斯湾是一个受冰川影响的海湾，位于海峡西北部分。使用阿加西拖网收集样本，目标是200-1200米深度的巨型动物和大型动物；海底和相关的动物群也使用浅水水下摄像系统（SUCS）就地记录。样地在深度、底物类型和现状方面存在差异，群落在丰富度、丰度、分类和功能组成方面也存在局部差异。最多样化的科包括移动捕食/食腐动物多角蛛科，至少有12种形态的105个个体，主要来自一个地点。这项研究首次揭示了在一个持续受到冰川影响的动态栖息地中，多样性和空间异质性的底栖生物群落，填补了在气候变化直接风险下研究较少的南大洋地区的采样空白。这些标本还将用于未来的分子研究，包括描述该遗址的遗传生物多样性，以及更广泛的系统地理和种群遗传分析，以评估该地区环节动物动物群的连通性、进化起源和人口历史。
The Prince Gustav Channel is a narrow seaway located in the western Weddell Sea on the northeastern-most tip of the Antarctic Peninsula. The channel is notable for both its deep (>1200 m) basins, and a dynamic glacial history that most recently includes the break-up of the Prince Gustav Ice Shelf, which covered the southern portion of the channel until its collapse in 1995. However, the channel remains mostly unsampled, with very little known about its benthic biology. We present a preliminary account of the benthic annelid fauna of the Prince Gustav Channel in addition to samples from Duse Bay, a sheltered, glacier-influenced embayment in the northwestern portion of the channel. Samples were collected using an Agassiz Trawl, targeting megafaunal and large macrofaunal sized animals at depths ranging between 200–1200 m; the seafloor and associated fauna were also documented in situ using a Shallow Underwater Camera System (SUCS). Sample sites varied in terms of depth, substrate type, and current regime, and communities were locally variable across sites in terms of richness, abundance, and both taxonomic and functional composition. The most diverse family included the motile predator/scavenger Polynoidae, with 105 individuals in at least 12 morphospecies, primarily from a single site. This study provides first insights into diverse and spatially heterogeneous benthic communities in a dynamic habitat with continuing glacial influence, filling sampling gaps in a poorly studied region of the Southern Ocean at direct risk from climate change. These specimens will also be utilized in future molecular investigations, both in terms of describing the genetic biodiversity of this site and as part of wider phylogeographic and population genetic analyses assessing the connectivity, evolutionary origins, and demographic history of annelid fauna in the region.