RELATIONSHIPS BETWEEN SIZE STRUCTURE OF INVERTEBRATE ASSEMBLAGES AND TROPHY AND SUBSTRATE COMPOSITION IN STREAMS
RELATIONSHIPS BETWEEN SIZE STRUCTURE OF INVERTEBRATE ASSEMBLAGES AND TROPHY AND SUBSTRATE COMPOSITION IN STREAMS
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DOI：
10.2307/1467205
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发表时间：
1995-09-01
影响因子：
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通讯作者：
MORIN, A
中科院分区：
文献类型：
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作者：
BOURASSA, N;MORIN, A
九个流网站，跨越水总磷浓度（[TP]）的范围内发现在东部安大略和西部魁北克，于1992年6月进行采样，以描述如何无脊椎动物的大小分布变化沿着营养梯度和基质类别，从沙子到小石块。尽管网站之间的分类组成有明显的差异，大小分布的形状是非常相似的，在所有网站。基质组合物影响的无脊椎动物的总体丰度比它们的大小分布。总密度在细砾石和粗砾石上达到峰值，在沙子和巨石上较低。无脊椎动物的总丰度在富营养化地点最高（[TP] > 40微克/升），尽管只有大于1毫米（约1微克干重）的生物在较丰富的地点显示出较高的丰度。总无脊椎动物丰度的增加与总磷浓度的增加表明，这些流磷限制。小于1毫米长的动物占不到3%的底栖生物组合的呼吸在我们的流中的所有衬底。无脊椎动物的大小分布，虽然受基板组成和奖杯，是非常恒定和可预测的在我们的流。大部分生物量，以及由此产生的消耗、呼吸和次级生产，存在于相对较大的无脊椎动物中。小型底栖动物是相对罕见的，因此，在我们研究的溪流群落代谢的直接影响不大。
Nine stream sites, spanning the range of water total phosphorus concentrations ([TP]) found in Eastern Ontario and Western Quebec, were sampled in June 1992 to describe how the size distribution of invertebrates varied along a nutrient gradient and among substrate categories ranging from sand to small boulders. Despite clear differences in the taxonomic composition among sites, the shape of the size distribution was remarkably similar in all sites. Substrate composition affected the overall abundance of invertebrates more than their size distribution. Overall density peaked on fine and coarse gravel and was lower on sand and boulders. Total abundance of invertebrates was highest in eutrophic sites ([TP] > 40 mu g/L), although only organisms larger than 1 mm (approximately 1 mu g dry mass) showed higher abundances in richer sites. The increase in total invertebrate abundance with increasing total phosphorus concentration suggests that these streams are phosphorus limited. Animals smaller than 1 mm long account for less than 3% of the respiration of the benthic assemblage on all substrates in our streams. Size distribution of invertebrates, although affected by substrate composition and trophy, is remarkably constant and predictable in our streams. Most of the biomass, and consequently the consumption, respiration, and secondary production, is found in relatively large invertebrates. Meiofauna is relatively rare and consequently has little direct influence on community metabolism in the streams we studied.