Shifts in Antarctic megabenthic structure after ice-shelf disintegration in the Larsen area east of the Antarctic Peninsula
Shifts in Antarctic megabenthic structure after ice-shelf disintegration in the Larsen area east of the Antarctic Peninsula
复制标题
南极半岛东部拉森地区冰架崩解后南极巨型底栖动物结构的变化
DOI：
10.1007/s00300-013-1315-7
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发表时间：
2013
期刊：
影响因子：
1.7
通讯作者：
Christian Pulcher
中科院分区：
文献类型：
--
作者：
J. Gutt;M. Cape;W. Dimmler;L. Fillinger;E. Isla;V. Lieb;T. Lundälv;Christian Pulcher
这项研究的目的是促进对南极大型底栖动物对环境变异和气候引起的变化的反应的一般了解。2007年和2011年，在南极半岛以东的拉森A地区，利用遥控潜水器成像方法调查了选定大型底栖生物种群规模的变化。2007年从Larsen B收集的数据补充了这些结果，以便在调查期间之前对环境驱动的变化进行概念重建。这两个拉森地区的特点是冰架解体分别在1995年和2002年，以及高年际变化海冰覆盖和海洋条件。2007年，在拉森A和B之间的剩余冰架带的北部和南部，海鞘物种Molgula pedunculata数量丰富。2007年至2011年期间，拉森A的人口密度急剧下降，与另一种海鞘科雷利亚eumyota的减少一致。在蛇类中，存款饲养者的数量增加了，而悬浮饲养者的数量减少了一半。目前的测量表明，拉森B和拉森A之间的向北流动，这表明，一个主要的物理强迫底栖动物种群的发展来自南方。结果表明，南极大型底栖动物种群可以表现出显着的人口动态。然而，对海冰动力学、盐度、温度和令人惊讶的冰架解体历史的分析并没有提供任何明确的证据来证明这些明显变化背后的环境驱动因素。
The aim of this study was to contribute to a general understanding of the response of the Antarctic macrobenthos to environmental variability and climate-induced changes. The change in population size of selected macrobenthic organisms was investigated in the Larsen A area east of the Antarctic Peninsula in 2007 and 2011 using ROV-based imaging methods. The results were complemented by data from the Larsen B collected in 2007 to allow a conceptual reconstruction of the environment-driven changes before the period of investigation. Both Larsen areas are characterised by ice-shelf disintegration in 1995 and 2002, respectively, as well as high inter-annual variability in sea-ice cover and oceanographic conditions. In 2007 one ascidian species, Molgula pedunculata, was abundant north and south of the stripe of remaining ice shelf between Larsen A and B. Population densities decreased drastically in the Larsen A between 2007 and 2011, coincident with the decrease in Corella eumyota, another ascidian. Among the ophiuroids, the population of deposit feeders increased, while suspension feeders halved their abundance. Current measurements indicated a northward flow between the Larsen B and Larsen A, suggesting that a major physical forcing on benthic population development comes from the South. The results demonstrate that Antarctic macrobenthic populations can exhibit dramatic population dynamics. Analyses of sea-ice dynamics, salinity, temperature and surprisingly ice-shelf disintegration history, however, did not provide any clear evidence for environmental drivers underlying the apparent changes.