The Replacement ofStenonemaspp. byCaenis diminutaWalker as the Numerical Dominant in the Mayfly Assemblage of a Thermally-Stressed Stream
作者:
N.LeRoy Poff,
RobinA. Matthews,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 1985)
卷期:
Volume 3,
issue 1
页码: 19-26
ISSN:0270-5060
年代: 1985
DOI:10.1080/02705060.1985.9665088
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Mayfly community structures in a thermally-stressed, previously thermally-stressed and an undisturbed stream were compared based on nymphal colonization of leaf packs incubated over a 48 d period from December 1982 to February 1983. Temperatures ranged from 7–31C in the thermally-stressed stream and from 4–12C in the other two streams. Accumulated degree days (>0C) were 734, 340 and 322 for the thermally-stressed, post-stressed and undisturbed streams, respectively.Stenonemaspp. numerically dominated the mayfly fauna over the sampling period in the undisturbed (70%) and post-stressed (98%) streams, but was replaced byCaenis diminutaWalker (88%) in the stream receiving thermal effluent from a nuclear production reactor.Caenis diminutais tolerant of rapidly fluctuating (Delta;T > 11C/hr) and high temperatures (possibly up to 40C).
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