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首页> 外文期刊>Polar biology >Life history and osmoregulatory ability of Telmatogeton amphibius (Diptera, Chironomidae) at Marion Island
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Life history and osmoregulatory ability of Telmatogeton amphibius (Diptera, Chironomidae) at Marion Island

机译：马里恩岛海螯虾两栖生活史（双翅目，Chi科）

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摘要

Although the non-crustacean arthropod fauna of the intertidal zone in the sub-Antarctic is both diverse and abundant, little is known about the biology of the species that occur in this habitat. Here, we provide information on the biology and osmoregulatory ability of the marine intertidal midge Telmatogeton amphibius (Eaton) (Diptera, Chironomidae) at Marion Island. Larval densities of this species in the lower shore zones can be as high as 16,000 individuals m(-2) in their preferred habitat during peak abundance in summer. Winter abundances are substantially lower, and adults are much less abundant than larvae. Like other chironomids, this species has four larval instars and the flightless adult females have obligatory parthenogenesis. It is a strong osmoregulator. Larvae show little variation in body mass irrespective of whether they find themselves in freshwater or seawater, or are switched between the media. Haemolymph osmolality [ca. 400 milliosmol (mOsm)] varies by only 61 mOsm over a 1,520 mOsm range of the external medium. T. amphibius is similar in many respects to intertidal telmatogetonine midges found in other geographic regions.
机译：尽管南极洲潮间带的非甲壳类节肢动物区系既多样又丰富，但对该生境中物种的生物学知之甚少。在这里，我们提供了有关马里恩岛海洋潮间带蚊类陆生两栖类两栖类两栖动物（伊顿）（双翅目，Chi科）的生物学和渗透调节能力的信息。在夏季高峰期间，在下岸地区该物种的幼虫密度在其首选栖息地中可能高达16,000个m（-2）。冬季的丰度要低得多，成年后的幼虫要比幼虫少得多。像其他尺虫一样，该物种有四只幼虫，而不会飞的成年雌性具有强制性孤雌生殖。它是强大的渗透调节剂。幼虫在体重方面几乎没有变化，无论它们是在淡水还是海水中发现自己，还是在培养基之间切换。血淋巴渗透压浓度[ca.在外部介质的1,520 mOsm范围内，400毫摩尔（mOsm）]的变化仅为61 mOsm。 T.两栖类在许多方面与在其他地理区域发现的潮间质telgetogetonine ges相似。

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