Effects of boulder addition on European grayling (Thymallus thymallus) in a channelized river in Sweden
| Autor: | Tomas Brodin, Daniel Palm, Mikael Carlstein, Peter Rivinoja, Gustav Hellström |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
restoration 010501 environmental sciences Aquatic Science survival timber floating 01 natural sciences grayling Abundance (ecology) lcsh:QH540-549.5 Mark resight lcsh:Environmental sciences Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences lcsh:GE1-350 abundance biology 010604 marine biology & hydrobiology Channelized Grayling streambed restoration biology.organism_classification Thymallus Fishery European grayling Geography Habitat mark-resight lcsh:Ecology |
| Zdroj: | Journal of Freshwater Ecology, Vol 34, Iss 1, Pp 559-573 (2019) |
| ISSN: | 2156-6941 0270-5060 |
| DOI: | 10.1080/02705060.2019.1614102 |
| Popis: | During the last century, the majority of Swedish rivers were heavily channelized to facilitate timber floating. This dramatically altered in-stream habitat by reducing the structural heterogeneity and increasing water velocity, which in turn had effects on the aquatic fauna. Today, extensive efforts to restore channelized rivers are being made by adding boulders to the streambed. In northern boreal rivers, evaluations of such restorations are often based on the response of trout and salmon populations. Few studies have investigated the effect on European grayling (Thymallus thymallus L), despite it being an important and vulnerable gamefish in both North America and Europe. This 6-year study investigated the effect of streambed restoration on grayling in a channelized, regulated (hydro-peaking) river in northern Sweden open to recreational fisheries. No effects on habitat preference, size, body condition, abundance or survival of grayling could be detected. The results are discussed based on grayling habitat preferences and behaviour, and give perspectives on streambed restoration in river conditions common to many Scandinavian grayling rivers today. The study is one of very few that presents multiyear abundance and survival estimates of grayling in a large boreal river. |
| Databáze: | OpenAIRE |
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