Biblioteca Digital do Instituto Politécnico de Bragança   Instituto Politécnico de Bragança

Biblioteca Digital do IPB >
Escola Superior Agrária >
Ambiente e Recursos Naturais >
ARN - Resumos em Proceedings Não Indexados ao ISI >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10198/5302

Título: Habitat selection by native and stocked trout (Salmo trutta L.) in Northeast streams, Portugal
Autor: Teixeira, Amílcar
Cortes, R.
Oliveira, Daniel
Issue Date: 2004
Citação: 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
Resumo: 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.
Arbitragem científica: yes
URI: http://hdl.handle.net/10198/5302
Appears in Collections:ARN - Resumos em Proceedings Não Indexados ao ISI

Files in This Item:

File Description SizeFormat
2004 Teixeira et al resumo com oral AIL Porto.pdf9,12 kBAdobe PDFView/Open
Statistics
FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpaceOrkut
Formato BibTex mendeley Endnote Logotipo do DeGóis 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 


  © Instituto Politécnico de Bragança - Biblioteca Digital - Feedback - Statistics
  Estamos no RCAAP Governo Português separator Ministério da Educação e Ciência   Fundação para a Ciência e a Tecnologia

Financiado por:

POS_C UE