Spawning Microhabitat Selection by Brown Trout in the Linthkanal, a Mid-Sized River
作者:
Bruno Schneider,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 2000)
卷期:
Volume 15,
issue 2
页码: 181-187
ISSN:0270-5060
年代: 2000
DOI:10.1080/02705060.2000.9663735
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The Linthkanal, a medium sized artificial river canal (mean discharge 55 m3s−1), does not fit the usual concept of a s awning water for brown trout. Nevertheless, during the spawning seasons of 1995/1996 and 1996/1997 100–150 redds were observed. Microhabitat parameters such as depth, current velocity, bottom substrate composition, and proportion of fine sediment at both spawning and random sites had been measured. At the spawning sites mean values for current velocity were 56 cm s−1and for depth 159 cm. These values are notably higher than those recorded in other studies. Microhabitat references for spawning sites were analyzed using multivariate logistic regression. The result was significant, indicating that the microhabitat parameters at chosen spawning sites were different from other areas in the canal. To elucidate these differences further, suitability and electivity indices were calculated.
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