Summertime grazing impact of the dominant macrozooplankton off the Western Antarctic Peninsula
Summertime grazing impact of the dominant macrozooplankton off the Western Antarctic Peninsula
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DOI：
10.1016/j.dsr.2011.12.015
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发表时间：
2012-04-01
影响因子：
2.4
通讯作者：
Schofield, Oscar M. E.
中科院分区：
文献类型：
--
作者：
Bernard, Kim S.;Steinberg, Deborah K.;Schofield, Oscar M. E.
南极西部半岛（WAP）是一个快速气候变化的地区，正在改变浮游生物群落结构。为了研究这些变化如何影响远洋食物网中的碳和能量转移，在2009年1月和2010年1月，作为帕尔默南极长期生态研究（LTER）的一部分，测量了WAP中五种主要大型浮游动物物种（南极磷虾、磷虾和Thysanoessa macrura;翼足类动物Limacina helicina和Salpa thompsoni）的摄食率。测量是在LTER测量网格的沿海-大陆架-近海和南北梯度上进行的。最高的放牧率发生在这两年的近海，2009年在南部，2010年在北部，所有这些都与大型局部海藻水华的存在有关。这两年，E。木荷是沿海的主要食草动物，而S. thompsoni人主要在近海放牧。L.在这两年里，螺旋藻是整个研究区域的重要食草动物，但在2009年期间，在大陆架上尤其如此。在2009年期间，有微小的差异，在大型浮游动物食草动物的相对重要性沿着南北梯度。然而，2010年北方出现的一次海藻水华，导致了主要食草动物的相对重要性从磷虾类和L。从南部的螺旋藻到北部的海鞘放牧对沿岸沃茨的影响较低（
The Western Antarctic Peninsula (WAP) is a region of rapid climate change that is altering plankton community structure. To investigate how these changes may impact carbon and energy transfer in the pelagic food web, grazing rates of the five dominant macrozooplankton species (euphausiids Euphausia superba, Euphausia crystallorophias, and Thysanoessa macrura; the pteropod Limacina helicina, and the salp Salpa thompsoni) in the WAP were measured in January 2009 and 2010 as part of the Palmer Antarctica Long-Term Ecological Research (LTER) study. Measurements were made across the coastal-shelf-offshore and north south gradients of the LTER survey grid. Highest grazing rates occurred offshore in both years, and in the south during 2009 and north during 2010, all associated with the presence of large localized salp blooms. During both years, E. superba was the major grazer at the coast, while S. thompsoni dominated grazing offshore. L. helicina was an important grazer throughout the study area during both years, but especially so over the shelf during 2009. During 2009, there was little difference in the relative importance of the rnacrozooplankton grazers along the north south gradient. The presence of a salp bloom in the north during 2010, though, resulted in a distinct shift in the relative importance of major grazers from the euphausiids and L. helicina in the south to salps in the north. Grazing impact was low in coastal waters (