Quantitative characterization of shallow marine benthic assemblages at Ryder Bay, Adelaide Island, Antarctica
Quantitative characterization of shallow marine benthic assemblages at Ryder Bay, Adelaide Island, Antarctica
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DOI：
10.1007/s00227-004-1526-0
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发表时间：
2005-04-01
期刊：
影响因子：
2.4
通讯作者：
Bowden, DA
中科院分区：
文献类型：
--
作者：
Bowden, DA
无损摄影技术在敏感地区的底栖动物调查中很有价值。然而，这些技术固有的选择性偏差与进行调查的规模有关。在对海洋底栖生物的调查中，这种偏见尚未得到解决。本研究调查了两个深度（8米和20米）和靠近南极洲阿德莱德岛Rothera Point的三个地点的地表层组合。为了涵盖广泛的分类单元大小和分布，采用了两种摄影抽样尺度，并且它们的平行使用允许在每个尺度的结果之间进行定性和定量比较。一个额外的物理采样元素被纳入评估无根隐组合。调查共记录了10门79个区系和6个藻类区系。在两个照相尺度上棘皮动物是物种最多的类群，而隐蔽类群以苔藓虫为主。不同尺度之间存在明显的分辨率相关差异，但三种方法都显示出深度和位置的明显差异。在这两个深度的群落中，通常的棘突鱼（Sterechinus neumayeri）的密度都很高（约为100个m(-2)），而在8 m的群落中，帽贝（naella concinna）的密度也很高（约为100个m(-2)）。这些结果强调了取样方法必须与所研究生物的大小光谱相匹配的一般要求，更具体地说，强调了需要进行研究，以评估生物和物理因素在构成南极底栖生物中的相对重要性。
Non-destructive photographic techniques are valuable for surveying benthic epifauna in sensitive areas. Inherent in these techniques, however, are selectivity biases related to the scale at which surveys are conducted. Such biases have not been addressed for surveys of marine benthos. The present study surveyed epifaunal assemblages at two depths ( 8 m and 20 m) and three locations close to Rothera Point, Adelaide Island, Antarctica. Two scales of photographic sampling were employed in order to encompass a broad range of taxon sizes and distributions, and their parallel use allowed qualitative and quantitative comparisons to be made between results from each scale. An additional physical sampling element was incorporated to assess sessile cryptic assemblages. A total of 79 faunal taxa from 10 phyla, together with 6 algal taxa, were recorded in the survey. Echinoderms were the most speciose group at both photographic scales, whereas cryptic assemblages were dominated by bryozoans. There were clear resolution- related differences between scales but all three methods revealed pronounced differences in assemblages by depth and location. Assemblages at both depths were notable for consistently high densities ( similar to 100 individuals m(-2)) of the regular echinoid Sterechinus neumayeri, and at 8 m for high densities ( similar to 100 individuals m(-2)) of the limpet Nacella concinna. The results emphasise the general requirement for sampling methodologies to be matched to the size spectra of the organisms under study and, more specifically, highlight the need for studies to assess the relative importance of biotic and physical factors in structuring the Antarctic benthos.