Please use this identifier to cite or link to this item:
|Title:||Habitat selection by native and stocked trout (Salmo trutta L.) in Northeast streams, Portugal|
|Citation:||Teixeira, A.; Cortes, R.; Oliveira, D. (2004) - Habitat selection by native and stocked trout (Salmo trutta L.) in Northeast streams, Portugal. In IV Congresso Ibérico de Limnologia AIL. Porto|
|Abstract:||Underwater observations were made during the summer season in three successive years to assess the effect of supplemental stocking of brown trout (Salmo trutta L.) in two headwater streams of northeastern Portugal. Significant differences were found in microhabitat used. Focal point position, total depth and cover were the variables contributing to the discrimination between stocked and native trout. Preference curves executed for native and stocked trout of the same age (1+), exhibited a distinct pattern in the capacity to explore the available microhabitat resources. In both streams, stocked trout tended to occupy deeper pools, while holding higher focal positions. All size classes of native trout show an overlap in microhabitat use, but smaller ones (< 10.0 cm), which showed a preference for shallow habitats with fast currents, typically riffle conditions. These results do not display obvious effects of competition on habitat exploitation between stocked and native trout but additional information related to feeding, reproduction and other biotic interactions is necessary to define adequate management strategies of salmonid streams.|
|Appears in Collections:||ARN - Resumos em Proceedings Não Indexados ao ISI/Scopus|
Files in This Item:
|2004 Teixeira et al resumo com oral AIL Porto.pdf||9,12 kB||Adobe PDF||View/Open|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.