BENTHIC RESPONSE TO WATER COLUMN PRODUCTIVITY PATTERNS - EVIDENCE FOR BENTHIC-PELAGIC COUPLING IN THE NORTHEAST WATER POLYNYA
BENTHIC RESPONSE TO WATER COLUMN PRODUCTIVITY PATTERNS - EVIDENCE FOR BENTHIC-PELAGIC COUPLING IN THE NORTHEAST WATER POLYNYA
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DOI：
10.1029/94jc01982
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发表时间：
1995-03-15
影响因子：
3.6
通讯作者：
RENAUD, PE
中科院分区：
文献类型：
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作者：
AMBROSE, WG;RENAUD, PE
冰湖，即在浮冰或浮冰之间反复出现的无冰区域，是预测极地地区中上层和底栖生物群落潜在生产力的模型系统。为了研究水柱过程对底栖生物的影响，研究了格陵兰岛东北陆架及其周围冰覆盖地区的东北水峡。我们测量了16个站点的动物密度、多毛类生物量、沉积物碳浓度和底栖色素浓度。底栖色素浓度是动物密度和多毛类生物量最重要的预测因子，解释了这些变量近一半的方差。底栖生物色素浓度与水柱色素浓度密切相关，表明水柱生产力的信号是在底部和底部接收到的。传染给动物群的。在北海槽口附近发现了最高的密度和生物量，并且可能是由发展中的浮游植物群落在向海槽平流时产生的生物物质提供燃料的。北海槽无冰水域下的密度和生物量也普遍高于被冰覆盖的南海槽。这种模式可能是由于北部海槽的初级生产力高于南部海槽和（或）南部浮游动物放牧导致水柱和底栖生物过程分离所致。沉积物有机碳浓度在0.5% ~ 1.5%之间，表明相对于温带和极地的陆架和深海系统，沉积物可能不是一个异常大的碳汇。这些结果强化了高纬度地区碳从水柱向底栖生物有效转移的新模式。由于北极浮游植物产量增加的小尺度和中尺度地区（如铅、边缘冰带）丰富，北冰洋及其周围海域的底栖生物生物量可能高于先前的预期。
Polynyas, recurring ice-free areas amid pack or drift ice, are model systems for predicting the potential productivity of pelagic and benthic communities in polar regions. The Northeast Water Polynya on the northeast Greenland continental shelf and surrounding ice-covered areas were investigated to address the influence of water column processes on the benthos. We measured infaunal density, polychaete biomass, sediment carbon concentration, and benthic pigment concentration from replicate box cores at 16 stations. Benthic pigment concentration is the most important predictor of infaunal density and polychaete biomass, explaining nearly half of the variance in these variables. Benthic pigment concentrations are strongly related to the concentrations of water column pigments, suggesting that the signal of water column productivity is received on the bottom and. transmitted to the fauna. The highest densities and biomass are found near the mouth of the Northern Trough and are probably fueled by biogenic material produced by the developing phytoplankton community as it: is advected down the trough. Density and biomass are also generally higher under the ice-free water of the Northern Trough than under the ice-covered Southern Trough. This pattern may be explained by greater primary productivity in the Northern than Southern Trough and/or by a decoupling of water column and benthic process by zooplankton grazing in the south. Sediment organic carbon concentration is between 0.5% and 1.5%, indicating that the sediment is probably not an unusually large carbon sink relative tb shelf and deep-sea systems in temperate and polar regions. These results reinforce an emerging pattern of efficient transfer of carbon from water column to benthos in high latitudes. Owing to the abundance of small-scale and mesoscale areas of enhanced phytoplankton production in the Arctic (e.g., leads, marginal ice zones), benthic biomass in the Arctic Ocean and surrounding seas may be higher than previously anticipated.