A field experiment on the value of allochthonous straw as food and substratum for lake macro-invertebrates
A field experiment on the value of allochthonous straw as food and substratum for lake macro-invertebrates
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外源秸秆作为湖泊大型无脊椎动物食物和基质价值的田间试验
DOI：
10.1111/j.1365-2427.1982.tb00634.x
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发表时间：
2006
影响因子：
2.7
通讯作者：
G. Titmus
中科院分区：
文献类型：
--
作者：
M. Street;G. Titmus
总结。通过实验研究了生境结构和食物可得性对湖泊大型无脊椎动物的相对重要性。一个深度均匀的砾石坑湖被分成两部分，其中一半加入了外来材料（稻草）。1980年5月，在湖的每半湖中添加了0.3毫米网目大小的重复凋落物袋，袋子里装有麻绳、稻草、木棉或丙纶线。2个月后，将它们取出，并对其中的无脊椎动物进行鉴定和计数。对数据进行统计分析，以确定袋子材料的相对重要性和袋子附近的外来碎屑（称为食物）的水平。在丰富的分类群中（每袋平均密度bb50个），只有C - hironomus独立于Material分布。另一个丰富的分类群（Gammmrus）。无翅虫、隐翅虫和滞海蝇受物质的影响均大于食物的影响。材料对总数量的影响是食物的14倍。在分析的17个分类群中，只有Pisidium的分布独立于任何一个因子。
SUMMARY. The relative importance of habitat structure and food availability to lake macro-invertebrates was investigated experimentally. A gravel-pit lake of uniform depth was partitioned into two parts and allochthonous material (straw) added to one half. Replicate litter bags of 0.3-mm mesh size containing sisal string, straw, wood-wool or polypropylene twine were added to each halt ol the lake in May 1980. After 2 months they were removed and the invertebrates within them identified and counted. Data were analysed statistically to determine the relative importance of bag Material and the level of allochthonous detritus in the vicinity of the bags (referred to as Food). Of the abundant taxa (> 5 individuals per bag mean density) only C hironomus was distributed independently of Material. The other abundant taxa (Gammmrus. Asellus, Cryptochirnomus and Helobdella stagnalis) were all more strongly influenced by Material than Food. The effect of Material on total numbers was 14 times more important than that of Food. Of the 17 taxa analysed, only Pisidium was distributed Independently of either faetor.
The relative abundance of total taxa was lowest in the sisal bags and greatest in the polypropylene and wood-wool bags. This is presumably related to structural properties of these materials with high abundance coinciding with an open buoyant substratum similar to that provided by aquatic macrophytcs. The importance of Material for most taxa indicates that the structural properties of the habitat may be very significant in determining animal distribution.