Spatial and temporal variations in deep-sea meiofauna assemblages in the Marginal Ice Zone of the Arctic Ocean
Spatial and temporal variations in deep-sea meiofauna assemblages in the Marginal Ice Zone of the Arctic Ocean
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DOI：
10.1016/j.dsr.2006.09.007
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发表时间：
2007-01-01
影响因子：
2.4
通讯作者：
Vanreusel, Ann
中科院分区：
文献类型：
--
作者：
Hoste, Eveline;Vanhove, Sandra;Vanreusel, Ann
为了了解深海小底栖生物对高度变化的冰缘相关植物碎屑输入的响应，我们研究了北极长期深海站HAUSGARTEN（北纬79度，东经4度）沿水深1200-5500 m连续5年（2000 - 2004年）的小底栖生物丰度和组成与环境条件变化的关系。结果表明，沉积物结合色素（叶绿素a和降解产物）的高浓度在4.5 ~ 41.6 μ g/cm(3)之间，同时低底沉密度在149 +/- 3 ~ 3409 +/- 525 ind/10cm之间(2)。线虫在各深度和时间的后生动物中占主导地位（占总数量的85 ~ 99%），其次是羽足类桡足类（占总数量的0 ~ 4.6%）。预期的随着水深的增加而逐渐降低的低底生密度模式没有得到证实。相反，水深样带可细分为1000 ~ 2000水深的线虫和桡足动物密度同样高的浅层区域(平均值：2259 +/- 157线虫/10cm(2)和50 +/- 4桡足动物/10cm(2))，以及3000 ~ 5500水深的较深区域，线虫和桡足动物密度相似低的区域(平均值：595 +/- 52线虫/10cm（2)和11 +/- 2桡足动物/10cm(2)）。对HAUSGARTEN站点的小底栖动物进行的深度相关调查显示，小底栖动物密度、微生物外酶活性（酯酶周转）和植物碎屑食物有效性（叶绿素a和叶绿素碱）之间存在显著相关性。在时间序列调查中，我们的数据显示了小型动物丰度的年际变化。然而，线虫和桡足动物的密度之间没有一致的关系，有机质输入的测量也没有发现。(c) 2006 Elsevier Ltd.版权所有。
In order to understand the response of the deep-sea meiobenthos to a highly varying, ice-edge-related input of phytodetritus, we investigated the abundance and composition of the meiobenthos at the arctic long-term deep-sea station HAUSGARTEN (79 degrees N, 4 degrees E) along a bathymetric transect (1200-5500 m water depth) over 5 consecutive years (from 2000 to 2004) in relation to changes in environmental conditions. Results showed high sediment-bound pigment concentrations (chlorophyll a and degradation products) ranging from 4.5 to 41.6 mu g/cm(3), and coinciding high meiobenthic densities ranging from 149 +/- 3 to 3409 +/- 525 ind/10cm(2). Nematodes dominated the metazoan meiofaunal communities at every depth and time (85-99% of total meiofauna abundance), followed by harpacticoid copepods (0-4.6% of total meiofauna abundance). The expected pattern of gradually decreasing meiobenthic densities with increasing water depth was not confirmed. Instead, the bathymetric transect could be subdivided into a shallow area with equally high nematode and copepod densities from 1000 to 2000 in water depth (means: 2259 +/- 157 Nematoda/10cm(2), and 50 +/- 4 Copepoda/10cm(2)), and a deeper area from 3000 to 5500 m water depth with similar low nematode and copepod densities (means: 595 +/- 52 Nematoda/10cm(2), and 11 +/- 2 Copepoda/10cm(2)). Depth-related investigations on the meiobenthos at the HAUSGARTEN site showed a significant correlation between meiobenthos densities, microbial exo-enzymatic activity (esterase turnover) and phytodetrital food availability (chlorophyll a and phaeophytines). In time-series investigations, our data showed inter-annual variations in meiofauna abundance. However, no consistent relationship between nematode and copepod densities, and measures for organic matter input were found. (c) 2006 Elsevier Ltd. All rights reserved.