FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/245330 |
Resumo: | This chapter describes and analyzes the bycatch of Sotalia guianensis, in gillnets by an artisan fishing fleet within the Amazonian estuary during two time periods: 1996-1997 and 1999-2001. Number, size and gender data, as well as dolphin specimens were obtained from fishermen at Brazilian ports and analyzed. Fishing capacity and effort were determined via simple linear regression and bycatch, fishing trip and fishing effort data were analyzed between time-periods, among climatic (seasonal) periods and between strata (based on vessel length). Results indicated that the stratum two fishing fleet not only had larger vessels but longer fishing trips, used longer nets and had larger fishing crews compared to stratum one's fleet. Bycatch increased in both strata between periods but to a greater extent in stratum two. Although there was an increased percentage of fishing trips with bycatch across time, there was a reduced mean number of dolphins per bycatch. There were also differences in the bycatch by sexual maturity with an indiscriminately larger number of sexual-reproducing adults caught in stratum two. Collectively, these results in conjunction with other anthropogenic factors combined with dolphins being a k-selected species, suggest that dolphin mortality from bycatch may seriously affect Sotalia guianensis in the Amazonian estuary. Furthermore, the fishery-dolphin interaction was characterized and determined to be indirectly predatory. |
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Repositório Institucional da UNESP |
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FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTHAmazonian estuarySotalia guianensisbycatchfishing-dolphin interactionThis chapter describes and analyzes the bycatch of Sotalia guianensis, in gillnets by an artisan fishing fleet within the Amazonian estuary during two time periods: 1996-1997 and 1999-2001. Number, size and gender data, as well as dolphin specimens were obtained from fishermen at Brazilian ports and analyzed. Fishing capacity and effort were determined via simple linear regression and bycatch, fishing trip and fishing effort data were analyzed between time-periods, among climatic (seasonal) periods and between strata (based on vessel length). Results indicated that the stratum two fishing fleet not only had larger vessels but longer fishing trips, used longer nets and had larger fishing crews compared to stratum one's fleet. Bycatch increased in both strata between periods but to a greater extent in stratum two. Although there was an increased percentage of fishing trips with bycatch across time, there was a reduced mean number of dolphins per bycatch. There were also differences in the bycatch by sexual maturity with an indiscriminately larger number of sexual-reproducing adults caught in stratum two. Collectively, these results in conjunction with other anthropogenic factors combined with dolphins being a k-selected species, suggest that dolphin mortality from bycatch may seriously affect Sotalia guianensis in the Amazonian estuary. Furthermore, the fishery-dolphin interaction was characterized and determined to be indirectly predatory.INPA, Manaus, Amazonas, BrazilUNESP, Dept Ecol, Rio Claro, BrazilUNESP, Dept Ecol, Rio Claro, BrazilNova Science Publishers, IncINPAUniversidade Estadual Paulista (UNESP)Beltran-Pedreros, SandraPetrere, Miguel [UNESP]RuizGarcia, M.Shostell, J. M.2023-07-29T11:51:47Z2023-07-29T11:51:47Z2010-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article221-235Biology, Evolution and Conservation of River Dolphins Within South America and Asia. Hauppauge: Nova Science Publishers, Inc, p. 221-235, 2010.http://hdl.handle.net/11449/245330WOS:000279207700011Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBiology, Evolution And Conservation Of River Dolphins Within South America And Asiainfo:eu-repo/semantics/openAccess2023-07-29T11:51:47Zoai:repositorio.unesp.br:11449/245330Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:59:24.000811Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH |
title |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH |
spellingShingle |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH Beltran-Pedreros, Sandra Amazonian estuary Sotalia guianensis bycatch fishing-dolphin interaction |
title_short |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH |
title_full |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH |
title_fullStr |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH |
title_full_unstemmed |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH |
title_sort |
FISHERY ACTIVITY IMPACT ON THE SOTALIA POPULATIONS FROM THE AMAZON MOUTH |
author |
Beltran-Pedreros, Sandra |
author_facet |
Beltran-Pedreros, Sandra Petrere, Miguel [UNESP] RuizGarcia, M. Shostell, J. M. |
author_role |
author |
author2 |
Petrere, Miguel [UNESP] RuizGarcia, M. Shostell, J. M. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
INPA Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Beltran-Pedreros, Sandra Petrere, Miguel [UNESP] RuizGarcia, M. Shostell, J. M. |
dc.subject.por.fl_str_mv |
Amazonian estuary Sotalia guianensis bycatch fishing-dolphin interaction |
topic |
Amazonian estuary Sotalia guianensis bycatch fishing-dolphin interaction |
description |
This chapter describes and analyzes the bycatch of Sotalia guianensis, in gillnets by an artisan fishing fleet within the Amazonian estuary during two time periods: 1996-1997 and 1999-2001. Number, size and gender data, as well as dolphin specimens were obtained from fishermen at Brazilian ports and analyzed. Fishing capacity and effort were determined via simple linear regression and bycatch, fishing trip and fishing effort data were analyzed between time-periods, among climatic (seasonal) periods and between strata (based on vessel length). Results indicated that the stratum two fishing fleet not only had larger vessels but longer fishing trips, used longer nets and had larger fishing crews compared to stratum one's fleet. Bycatch increased in both strata between periods but to a greater extent in stratum two. Although there was an increased percentage of fishing trips with bycatch across time, there was a reduced mean number of dolphins per bycatch. There were also differences in the bycatch by sexual maturity with an indiscriminately larger number of sexual-reproducing adults caught in stratum two. Collectively, these results in conjunction with other anthropogenic factors combined with dolphins being a k-selected species, suggest that dolphin mortality from bycatch may seriously affect Sotalia guianensis in the Amazonian estuary. Furthermore, the fishery-dolphin interaction was characterized and determined to be indirectly predatory. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-01-01 2023-07-29T11:51:47Z 2023-07-29T11:51:47Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Biology, Evolution and Conservation of River Dolphins Within South America and Asia. Hauppauge: Nova Science Publishers, Inc, p. 221-235, 2010. http://hdl.handle.net/11449/245330 WOS:000279207700011 |
identifier_str_mv |
Biology, Evolution and Conservation of River Dolphins Within South America and Asia. Hauppauge: Nova Science Publishers, Inc, p. 221-235, 2010. WOS:000279207700011 |
url |
http://hdl.handle.net/11449/245330 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Biology, Evolution And Conservation Of River Dolphins Within South America And Asia |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
221-235 |
dc.publisher.none.fl_str_mv |
Nova Science Publishers, Inc |
publisher.none.fl_str_mv |
Nova Science Publishers, Inc |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128732592865280 |