Daytime habitat selection for juvenile parr brown trout (Salmo trutta) in small lowland streams
Physical habitat is important in determining the carrying capacity of juvenile brown trout, and within freshwater management. Summer daytime physical habitat selection for the parr lifestage (7–20 cm) juvenile brown trout (Salmo trutta) was assessed in 6 small lowland s...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2014-03-01
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| Series: | Knowledge and Management of Aquatic Ecosystems |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1051/kmae/2014006 |
| _version_ | 1818497611438489600 |
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| author | Conallin J. Boegh E. Olsen M. Pedersen S. Dunbar M.J. Jensen J.K. |
| author_facet | Conallin J. Boegh E. Olsen M. Pedersen S. Dunbar M.J. Jensen J.K. |
| author_sort | Conallin J. |
| collection | DOAJ |
| description | Physical habitat is important in determining the carrying capacity of juvenile brown
trout, and within freshwater management. Summer daytime physical habitat selection for the
parr lifestage (7–20 cm) juvenile brown trout (Salmo trutta) was assessed
in 6 small lowland streams. Habitat preference was determined for the four variables;
water velocity, water depth, substrate and cover, and the preferences for physical habitat
selection were expressed in terms of habitat suitability indices (HSI’s). The statistical
confidence of HSI’s was evaluated using power analysis. It was found that a minimum of 22
fish observations was needed to have statistical confidence in the HSIs for water depth,
and a minimum of 92 fish observations for water velocity during daytime summer conditions.
Generally parr were utilising the deeper habitats, indicating preference for deeper water.
Cover was also being selected for at all sites, but selection was inconsistent among sites
for the variables substrate and velocity. The results indicate that during daytime summer
conditions water depth is a significant variable for parr habitat selection in these small
lowland streams, with cover also being important. Therefore, daytime refugia may be a
critical limiting factor for parr in small lowland streams, and important for stream
management actions under the Water Framework Directive. |
| first_indexed | 2024-12-10T18:47:33Z |
| format | Article |
| id | doaj.art-82f8d7dfeaad4487b23e45348a1dfafd |
| institution | Directory Open Access Journal |
| issn | 1961-9502 |
| language | English |
| last_indexed | 2024-12-10T18:47:33Z |
| publishDate | 2014-03-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Knowledge and Management of Aquatic Ecosystems |
| spelling | doaj.art-82f8d7dfeaad4487b23e45348a1dfafd2022-12-22T01:37:26ZengEDP SciencesKnowledge and Management of Aquatic Ecosystems1961-95022014-03-0104130910.1051/kmae/2014006kmae130126Daytime habitat selection for juvenile parr brown trout (Salmo trutta) in small lowland streamsConallin J.0Boegh E.1Olsen M.2Pedersen S.3Dunbar M.J.4Jensen J.K.5Roskilde UniversityRoskilde UniversityGeological Survey of Denmark and Greenland (GEUS), O. Voldgade 10Technical University of Denmark - AQUA, National Institute of Aquatic ResourcesCentre for Ecology and HydrologyDHI Water Environment and HealthPhysical habitat is important in determining the carrying capacity of juvenile brown trout, and within freshwater management. Summer daytime physical habitat selection for the parr lifestage (7–20 cm) juvenile brown trout (Salmo trutta) was assessed in 6 small lowland streams. Habitat preference was determined for the four variables; water velocity, water depth, substrate and cover, and the preferences for physical habitat selection were expressed in terms of habitat suitability indices (HSI’s). The statistical confidence of HSI’s was evaluated using power analysis. It was found that a minimum of 22 fish observations was needed to have statistical confidence in the HSIs for water depth, and a minimum of 92 fish observations for water velocity during daytime summer conditions. Generally parr were utilising the deeper habitats, indicating preference for deeper water. Cover was also being selected for at all sites, but selection was inconsistent among sites for the variables substrate and velocity. The results indicate that during daytime summer conditions water depth is a significant variable for parr habitat selection in these small lowland streams, with cover also being important. Therefore, daytime refugia may be a critical limiting factor for parr in small lowland streams, and important for stream management actions under the Water Framework Directive.http://dx.doi.org/10.1051/kmae/2014006Daytime refugiahabitat selectionhabitat suitability indicespredationwater management |
| spellingShingle | Conallin J. Boegh E. Olsen M. Pedersen S. Dunbar M.J. Jensen J.K. Daytime habitat selection for juvenile parr brown trout (Salmo trutta) in small lowland streams Knowledge and Management of Aquatic Ecosystems Daytime refugia habitat selection habitat suitability indices predation water management |
| title | Daytime habitat selection for juvenile parr brown trout
(Salmo trutta) in small lowland streams |
| title_full | Daytime habitat selection for juvenile parr brown trout
(Salmo trutta) in small lowland streams |
| title_fullStr | Daytime habitat selection for juvenile parr brown trout
(Salmo trutta) in small lowland streams |
| title_full_unstemmed | Daytime habitat selection for juvenile parr brown trout
(Salmo trutta) in small lowland streams |
| title_short | Daytime habitat selection for juvenile parr brown trout
(Salmo trutta) in small lowland streams |
| title_sort | daytime habitat selection for juvenile parr brown trout salmo trutta in small lowland streams |
| topic | Daytime refugia habitat selection habitat suitability indices predation water management |
| url | http://dx.doi.org/10.1051/kmae/2014006 |
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