Tardigrade eggs and exuviae in Antarctic lake sediments: insights into Holocene dynamics and origins of the fauna
Tardigrade eggs and exuviae in Antarctic lake sediments: insights into Holocene dynamics and origins of the fauna
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南极湖泊沉积物中的缓步动物卵和蜕皮：深入了解全新世动态和动物群起源
DOI：
10.4081/jlimnol.2007.s1.65
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发表时间：
2007
影响因子：
1.6
通讯作者：
Nigel J. Marley
中科院分区：
文献类型：
--
作者：
J. Gibson;L. Cromer;Janelle T. Agius;S. McInnes;Nigel J. Marley
南极湖泊沉积物中的缓步动物卵和蜕皮的保存提供了一个机会，以评估冰后期殖民和全新世缓步动物在南部大陆的动态。在五个湖泊中发现了缓步动物的卵，其中两个来自南极洲的海洋，三个来自南极洲的大陆。从以下物种中鉴定出卵：Dacacquitebiotus cf. ambiguus、Macrobiotus furciger、Macrobiotus blocki、Minibiotus weinerorum和Acutuncus anastriticus。还观察到其他未孵化的卵。这些蛋中的一些保存在蜕皮允许鉴定至少属。在每个湖泊的沉积物中观察到卵丰度的显着变化，在一个湖泊中有一个物种（Dacacquillabiotus cf.可能是由于与企鹅有关的富营养化造成的。在湖泊形成后的相当长一段时间内，水熊虫通常不会变得丰富。部分特有动物群的存在是一致的，从南极源，而不是风运输从大陆外的网站缓慢殖民。在高纬度湖泊沉积物中，缓步动物的卵似乎是丰富的，在全新世评估缓步动物的动态时，可以更多地利用这些记录。
The preservation of tardigrade eggs and exuviae in Antarctic lake sediments provided an opportunity to assess post-glacial colonisation and Holocene tardigrade dynamics on the southern continent. Tardigrade eggs were recovered from five lakes, two from the maritime Antarctic and three from continental Antarctica. Eggs were identified from the following species: Dactylobiotus cf. ambiguus, Macrobiotus furciger, Macrobiotus blocki, Minibiotus weinerorum and Acutuncus antarcticus. Other, unornamented eggs were also observed. The preservation of some of these eggs in exuviae allowed identification to at least genus. Significant variations were observed in egg abundance within the sediment of each lake, and in one lake a species (Dactylobiotus cf. ambiguus) became locally extinct, probably as the result of penguin-associated eutrophication. Tardigrades generally did not become abundant for a considerable period after the lakes’ formation. The presence of an in-part endemic fauna is consistent with slow colonisation from Antarctic sources rather than wind transport from extra-continental sites. Tardigrade eggs appear to be abundant in high-latitude lake sediments, and greater use could be made of these records when evaluating tardigrade dynamics during the Holocene.