MACROBENTHOS AND MACROBENTHIC REMAINS ON THE OYSTER GROUND, NORTH-SEA
MACROBENTHOS AND MACROBENTHIC REMAINS ON THE OYSTER GROUND, NORTH-SEA
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DOI：
10.1016/0077-7579(84)90030-9
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发表时间：
1984-01-01
期刊：
影响因子：
--
通讯作者：
CADEE, GC
中科院分区：
文献类型：
--
作者：
CADEE, GC
在北海的一个有限的部分估计了大型底栖生物的生物量。研究区北方以泥质沉积为主，南部以桑迪沉积为主。在北方地区，大型底栖动物（ADW）[无灰干重]生物量为10.6 ±。5.6 g.cntdot. m ~（-2），南部地区为5.7 ±. 3.4 g.cntdot. m-2标准偏差相对较大，也站内，这掩盖了生物量的季节性趋势。沉积物中绝大部分有机碳为死有机碳。Macrobenthos提供了. apprx。10%，死的和活的藻类另一个。占总有机质的10%。有些种类仅限于桑迪区，更多种类是泥质区特有的，很少有种类遍布整个区域。在物种组成上，南部为鸡金星群落，北方为丝状文昌鱼群落。死亡molluckan组合的数量组成是不同的生活组合。造成这种差异的最重要原因是一个古老的潮滩动物群的混合。这个. apprx的残余。9000年前的动物群仍然存在于沉积物表面或附近。这表明在所研究的区域内沉积物很少。因此，死亡的组合是一个高度浓缩的动物群。在地质记录中，由生活在不同环境条件下的连续群落的遗骸混合而成的浓缩动物群可能比以前认识到的更为广泛。
The macrobenthic biomass was estimated in a restricted part of the North Sea. Muddy sediments prevailed in the northern part, sandy sediments in the southern part of the area. In the northern area macrobenthic (ADW) [Ash-free dry weight] biomass was 10.6 .+-. 5.6 g .cntdot. m-2, in the southern areas 5.7 .+-. 3.4 g .cntdot. m-2. The standard deviations were relatively large also within stations, which obscured seasonal trends in biomass. Most organic C in the sediment was dead organic C. Macrobenthos contributed .apprx. 10%, dead and living algae another .apprx. 10% of total organic matter. Some species were confined to the sandy area, more species were characteristic for the muddy area and very few were found all over the area. The species composition indicates a Venus gallina community in the southern part and an Amphiura filiformis community in the northern part. The quantitative composition of the dead molluckan assemblages was different from the living assemblages. The most important cause for this discrepancy was admixture of an old tidal flat fauna. Remains of this .apprx. 9000 yr old fauna are still present at or near the sediment surface. This suggests little sedimentation in the area studied. The dead assemblage therefore was a strongly condensed fauna. Condensed faunas with a mixture of remains of successive communities living under different environmental conditions may be more widespread in the geological record than earlier recognized.