Publicação
Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal
| Resumo: | Habitat use by stocked and native brown trout (Salmo trutta L.) was assessed in two headwater streams of northeastern Portugal. Underwater observations were made during the summer season in three successive years to evaluate the effect of supplemental trout stocking. Multivariate analysis techniques applied to microhabitat use data sets were used to identify the focal elevation (distance of fish from the bottom), total depth and cover as the variables that contribute most to the discrimination between stocked and native trout. Preference curves computed for native and stocked trout of the same age (1+), showed a distinct pattern in their ability to explore the available microhabitat resources. Stocked trout tended to occupy deeper pools (total depth > 100 cm vs. 60-100 cm for native trout), holding higher focal elevations (140-160 cm vs. < 20 cm for native) with lower water column velocities (< 10 cm.s-1 vs. 10-20 cm.s-1 for native) and no specific preference for cover. In contrast, native trout displayed a clear preference for microhabitats with coarse substrate (particle size > 22.5 cm) and cover (combination of boulders and overhanging vegetation or undercut banks). Furthermore, a high post-stocking movement of 80 % hatchery-reared fish was verified just one month after their release, suggesting that stocking did not contribute to the sustainable populations in either stream, and is far from being an adequate management technique. |
|---|---|
| Autores principais: | Teixeira, Amílcar |
| Outros Autores: | Cortes, Rui M.V.; Oliveira, Daniel |
| Assunto: | Salmo trutta Snorkelling Restocking Microhabitat Preference curves |
| Ano: | 2006 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| _version_ | 1867173393221025792 |
|---|---|
| author | Teixeira, Amílcar |
| author2 | Cortes, Rui M.V. Oliveira, Daniel |
| author2_role | author author |
| author_facet | Teixeira, Amílcar Cortes, Rui M.V. Oliveira, Daniel |
| author_role | author |
| contributor_name_str_mv | Biblioteca Digital do IPB |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Teixeira, Amílcar\",\"Person.identifier.orcid\":\"0000-0001-5336-1174\"},{\"Person.name\":\"Cortes, Rui M.V.\"},{\"Person.name\":\"Oliveira, Daniel\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Biblioteca Digital do IPB |
| datacite.creators.creator.creatorName.fl_str_mv | Teixeira, Amílcar Cortes, Rui M.V. Oliveira, Daniel |
| datacite.date.Accepted.fl_str_mv | 2006-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2009-01-29T16:35:31Z |
| datacite.date.embargoed.fl_str_mv | 2009-01-29T16:35:31Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Salmo trutta Snorkelling Restocking Microhabitat Preference curves |
| datacite.titles.title.fl_str_mv | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| dc.contributor.none.fl_str_mv | Biblioteca Digital do IPB |
| dc.creator.none.fl_str_mv | Teixeira, Amílcar Cortes, Rui M.V. Oliveira, Daniel |
| dc.date.Accepted.fl_str_mv | 2006-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2009-01-29T16:35:31Z |
| dc.date.embargoed.fl_str_mv | 2009-01-29T16:35:31Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10198/998 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | ONEMA - Office National de L’eau et des Milieux Aquatiques |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | Salmo trutta Snorkelling Restocking Microhabitat Preference curves |
| dc.title.fl_str_mv | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | Habitat use by stocked and native brown trout (Salmo trutta L.) was assessed in two headwater streams of northeastern Portugal. Underwater observations were made during the summer season in three successive years to evaluate the effect of supplemental trout stocking. Multivariate analysis techniques applied to microhabitat use data sets were used to identify the focal elevation (distance of fish from the bottom), total depth and cover as the variables that contribute most to the discrimination between stocked and native trout. Preference curves computed for native and stocked trout of the same age (1+), showed a distinct pattern in their ability to explore the available microhabitat resources. Stocked trout tended to occupy deeper pools (total depth > 100 cm vs. 60-100 cm for native trout), holding higher focal elevations (140-160 cm vs. < 20 cm for native) with lower water column velocities (< 10 cm.s-1 vs. 10-20 cm.s-1 for native) and no specific preference for cover. In contrast, native trout displayed a clear preference for microhabitats with coarse substrate (particle size > 22.5 cm) and cover (combination of boulders and overhanging vegetation or undercut banks). Furthermore, a high post-stocking movement of 80 % hatchery-reared fish was verified just one month after their release, suggesting that stocking did not contribute to the sustainable populations in either stream, and is far from being an adequate management technique. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| fulltext.url.fl_str_mv | https://bibliotecadigital.ipb.pt/bitstreams/091009dd-ddda-487d-b80a-7e105231cfba/download |
| id | ipb_8e6fa7bdb697c9fa56949ee852d4b314 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10198/998 |
| instacron_str | ipb |
| institution | Instituto Politécnico de Bragança |
| instname_str | Instituto Politécnico de Bragança |
| language | eng |
| network_acronym_str | ipb |
| network_name_str | Biblioteca Digital do IPB |
| oai_identifier_str | oai:bibliotecadigital.ipb.pt:10198/998 |
| organization_str_mv | urn:organizationAcronym:ipb |
| person_str_mv | Teixeira, Amílcar Teixeira, Amílcar https://www.ciencia-id.pt/9510-3CF3-0393 9510-3CF3-0393 http://orcid.org/0000-0001-5336-1174 0000-0001-5336-1174 Cortes, Rui M.V. Oliveira, Daniel |
| publishDate | 2006 |
| publisher.none.fl_str_mv | ONEMA - Office National de L’eau et des Milieux Aquatiques |
| reponame_str | Biblioteca Digital do IPB |
| repository_id_str | urn:repositoryAcronym:ipb |
| service_str_mv | urn:repositoryAcronym:ipb |
| spelling | engONEMA - Office National de L’eau et des Milieux AquatiquesenHabitat use by stocked and native brown trout (Salmo trutta L.) was assessed in two headwater streams of northeastern Portugal. Underwater observations were made during the summer season in three successive years to evaluate the effect of supplemental trout stocking. Multivariate analysis techniques applied to microhabitat use data sets were used to identify the focal elevation (distance of fish from the bottom), total depth and cover as the variables that contribute most to the discrimination between stocked and native trout. Preference curves computed for native and stocked trout of the same age (1+), showed a distinct pattern in their ability to explore the available microhabitat resources. Stocked trout tended to occupy deeper pools (total depth > 100 cm vs. 60-100 cm for native trout), holding higher focal elevations (140-160 cm vs. < 20 cm for native) with lower water column velocities (< 10 cm.s-1 vs. 10-20 cm.s-1 for native) and no specific preference for cover. In contrast, native trout displayed a clear preference for microhabitats with coarse substrate (particle size > 22.5 cm) and cover (combination of boulders and overhanging vegetation or undercut banks). Furthermore, a high post-stocking movement of 80 % hatchery-reared fish was verified just one month after their release, suggesting that stocking did not contribute to the sustainable populations in either stream, and is far from being an adequate management technique.application/pdfenHabitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, PortugalPersonalTeixeira, AmílcarDSpacehttp://dspace.org/items/4f0753fd-4b4f-46f6-8e2f-20c7f835a32aDSpacehttp://dspace.org/items/4f0753fd-4b4f-46f6-8e2f-20c7f835a32aTeixeiraAmilcarCiência IDhttps://www.ciencia-id.pt9510-3CF3-0393ORCIDhttp://orcid.org0000-0001-5336-1174Scopus Author IDhttps://www.scopus.com7202385393Cortes, Rui M.V.Oliveira, DanielHostingInstitutionOrganizationalBiblioteca Digital do IPBe-mailmailto:dspace@ipb.ptdspace@ipb.ptISSNIsPartOf1297-6318DOIIsPartOf10.1051/kmae:20060042009-01-29T16:35:31Z20062006-01-01T00:00:00ZHandlehttp://hdl.handle.net/10198/998http://purl.org/coar/access_right/c_abf2open accessSalmo truttaSnorkellingRestockingMicrohabitatPreference curves252249 bytesliteraturehttp://purl.org/coar/resource_type/c_6501journal articlehttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://bibliotecadigital.ipb.pt/bitstreams/091009dd-ddda-487d-b80a-7e105231cfba/download |
| spellingShingle | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal Teixeira, Amílcar Salmo trutta Snorkelling Restocking Microhabitat Preference curves |
| status | SINGLETON |
| subject.fl_str_mv | Salmo trutta Snorkelling Restocking Microhabitat Preference curves |
| title | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| title_full | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| title_fullStr | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| title_full_unstemmed | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| title_short | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| title_sort | Habitat use by native and stocked trout (Salmo trutta L.) in two northeast streams, Portugal |
| topic | Salmo trutta Snorkelling Restocking Microhabitat Preference curves |
| topic_facet | Salmo trutta Snorkelling Restocking Microhabitat Preference curves |
| url | http://hdl.handle.net/10198/998 |
| visible | 1 |