Fishing for scavengers: an integrated study to amphipod (Crustacea: Lysianassoidea) diversity of Potter Cove (South Shetland Islands, Antarctica)

Fishing for scavengers: an integrated study to amphipod (Crustacea: Lysianassoidea) diversity of Potter Cove (South Shetland Islands, Antarctica)
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捕捞食腐动物:波特湾(南极洲南设得兰群岛)片脚类(甲壳类:Lysianassoidea)多样性的综合研究

DOI:
10.1007/s12526-017-0737-9
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发表时间:
2017
影响因子:
1.6
通讯作者:
Held C
Held C
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Seefeldt MA;Weigand AM;Havermans C;Moreira E;Held C

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端足类来自Lysianassoidea Dana,1849总科,由于其高生物量、丰富度和主要的食腐模式,在南大洋底栖食物网中发挥着重要作用。即使在南极西部半岛研究得很好的地区,我们对雷西安纳索动物群的了解也是不完整的。在这里,我们报告的综合研究的结果,波特湾,国王乔治岛/岛25德马约(KGI)的lysianassoid端足类动物,结合形态和分子物种鉴定(COIbarcoding)的方法,调查超过41,000个标本的诱饵陷阱。为了进行比较,分析了邻近玛丽安湾的2,039个标本。在波特湾较深的外湾记录了10种Lysianassoid,而内湾(<50 m)则以一种Cheirimedon femoratusPfeffer,1888(99.44%相对丰度)为主。据推测,受融水影响的内湾内的贫困lysianassoid动物群代表了冰川融化加剧条件下西南极半岛沿着未来条件的模型。Abyssorchomene charcoti(Chevreux,1912)和Orchomenella pinguidesWalker,1903首次在凯基研究所沃茨水域被记录。此外,还描述了OrchomenellaSars,1890的一新种:Orchomenella infinitasp. n. Seefeldt,2017年。首次建立了Cheirimedon femoratus,Hippomedon kergueleniMiers,1875,Orchomenella rotundifronsK.H. Barnard,1932和Orchomenella infinitasp. n.
Amphipoda from the superfamily Lysianassoidea Dana, 1849 play an important role in Southern Ocean benthic food webs due to their high biomass, abundance and predominantly scavenging mode of feeding. Our knowledge on the lysianassoid fauna, even in well-studied areas of the Western Antarctic Peninsula, is incomplete. Here we report the findings of an integrated study of lysianassoid amphipods of Potter Cove, King George Island/Isla 25 de Mayo (KGI), combining morphological and molecular species identification (COIbarcoding) methods, investigating more than 41,000 specimens from baited traps. For comparison, 2,039 specimens from the adjacent Marian Cove were analysed. Ten lysianassoid species were recorded in the deeper outer Potter Cove, whereas the inner cove (<50 m) was dominated by a single species,Cheirimedon femoratusPfeffer, 1888 (99.44% relative abundance). It is hypothesised that the impoverished lysianassoid fauna inside the meltwater-influenced inner cove represents a model for future conditions along the Western Antarctic Peninsula under conditions of increased glacial melting.Abyssorchomene charcoti(Chevreux, 1912) andOrchomenella pinguidesWalker, 1903 were recorded in KGI waters for the first time. Furthermore, one new lysianassoid amphipod species of the genusOrchomenellaSars, 1890 is described:Orchomenella infinitasp. n. Seefeldt, 2017. First-time DNA barcode data was established forCheirimedon femoratus,Hippomedon kergueleniMiers, 1875,Orchomenella rotundifronsK.H. Barnard, 1932 andOrchomenella infinitasp. n.
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