Invertebrate resistance and resilience to intermittency in a desert stream
Invertebrate resistance and resilience to intermittency in a desert stream
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无脊椎动物对沙漠溪流间歇性的抵抗力和恢复力
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
S. Fisher
中科院分区：
文献类型：
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作者：
E. Stanley;D. Buschman;A. Boulton;N. Grimm;S. Fisher
在西卡莫尔溪，间歇性索诺兰沙漠流无脊椎动物失水的反应进行了研究，在干燥，干燥和再润湿阶段。一些分类群是耐干燥，因为他们可以容忍迅速变化的水质和/或移动上游，以避免搁浅。当一个地点与上游和下游河段隔离时，群落发生了变化;甲虫、半翅目昆虫和蜗牛Physella virgata等类群成为主导。没有社区的变化，检测到在第二个网站，仍然与上游河段的表面流。失水后死亡率很高，因为很少有个体存活超过10天。干燥阶段的低电阻与沉积物的快速水分损失有关。无脊椎动物的持久性在间歇性河段是由于rewetting后的damonization，然而，密度增加后，洪水重建流量在干燥的网站低于常年网站在西卡莫尔溪的报告值。缓慢的恢复率可能反映了大型无脊椎动物的组成，规模缩小和偏远的殖民池。尽管如此，无脊椎动物在洪水和干旱频繁的沙漠溪流中的持久性在很大程度上是由于它们能够迅速使受干扰的地点退化。
Invertebrate responses to water loss were investigated during drying, dry and rewetting phases in Sycamore Creek, an intermittent Sonoran Desert stream. Some taxa were resistant to drying because they could tolerate rapidly changing water quality and/or move upstream to avoid stranding. Community shifts occurred at one site when it became isolated from upand downstream reaches; taxa such as beetles, hemipterans, and the snail Physella virgata became dominant. No community changes were detected at a second site which remained connected with upstream reaches by surface flow. Mortality after water loss was severe as few individuals survived longer than 10 days. Low resistance during the dry phase was associated with rapid moisture loss from sediments. Invertebrate persistence in intermittent reaches was due to recolonization after rewetting; however, density increases after floods which reestablished flow at dry sites were lower than reported values for perennial sites in Sycamore Creek. Slower rates of recovery may reflect he composition, reduced size and remoteness of macroinvertebrate colonist pools. Nonetheless, invertebrate persistence in desert streams where both flooding and drying are frequent is due largely to their ability to rapidly recolonize disturbed sites.