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首页> 外文期刊>Polar biology >Juvenile morphology of the large Antarctic canopy-forming brown alga, Desmarestia menziesii J. Agardh
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Juvenile morphology of the large Antarctic canopy-forming brown alga, Desmarestia menziesii J. Agardh

机译：大型南极冠层褐藻Desmarestia menziesii J. Agardh的幼体形态

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摘要

For many types of seaweeds in Polar Regions, open questions remain about how their life cycle contributes to their overall adaptation to the extreme abiotic environment. This applies in particular to the major canopy-forming brown algae in much of the Antarctic Peninsula of the genus Desmarestia, which was investigated here. Diving surveys around Rothera Research Station (Adelaide Island, Antarctica) during December 2017-February 2018 revealed the widespread presence of a hitherto-unknown life form of Desmarestia sp. of a tender, feather-like morphology. Further studies explored whether this could be (1) a new, hitherto undescribed Desmarestia species (2) a new record for the region of a known Desmarestia species previously recorded elsewhere or (3) a so-far unknown life form of a species recorded for the region. Collections enabled the extraction of PCR-friendly DNA and sequencing of ITS1, which unambiguously showed that the samples belonged to Desmarestia menziesii, the only Desmarestia species presently recorded for the Adelaide Island/Marguerite Bay region. The presence of the juvenile morphology was subsequently confirmed throughout much of the natural range of D. menziesii during cruise-based diving surveys along the Western Antarctic Peninsula in 2019 and from collections at Anvers Island in 1989. Our collections thus constitute its juvenile morphology, which is not previously documented in the literature. The wider significance for the Polar seaweeds is discussed in the context of Taxonomy and Ecology.
机译：对于极地地区的许多类型的海藻，仍然存在尚未解决的问题，即它们的生命周期如何有助于其对极端非生物环境的整体适应性。这尤其适用于Desmarestia属的许多南极半岛中形成主要冠层的褐藻，在此进行了调查。 2017年12月至2018年2月在罗瑟拉研究站（南极阿德莱德岛）周围进行的潜水调查显示，迄今为止广泛存在的Desmarestia sp。像羽毛一样柔软的形态。进一步的研究探讨了这可能是（1）迄今未描述的新的Desmarestia物种（2）先前在其他地方记录过的已知Desmarestia物种区域的新记录，还是（3）迄今为止为该物种记录的迄今为止未知的生命形式该区域。收集能够提取PCR友好的DNA并进行ITS1测序，这明确表明样品属于Desmarestia menziesii，这是阿德莱德岛/玛格丽特湾地区目前唯一记录的Desmarestia物种。随后，在2019年沿南极半岛西部进行的基于巡航的潜水调查以及1989年在安弗斯岛的藏品中，证实了门氏石D的大部分自然范围内均存在少年形态。因此，我们的藏品构成了其少年形态。以前没有文献记载。在分类学和生态学的背景下讨论了极地海藻的更广泛意义。

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