A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil
The franciscana, Pontoporia blainvillei, is endemic to the western South Atlantic Ocean and is perhaps one of the most threatened small cetacean species in this region. This paper presents a first abundance estimate for the coastal waters of Rio Grande do Sul State (southern Brazil) and Uruguay. In...
Main Authors: | , , , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.172.1434 http://www.cetaceanbycatch.org/Papers/abundance_franciscana.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.172.1434 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.172.1434 2023-05-15T18:21:05+02:00 A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil Eduardo R. Secchi Paulo H. Ott Enrique A. Crespo Paul G. Kinas Susana N. Pedraza The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.172.1434 http://www.cetaceanbycatch.org/Papers/abundance_franciscana.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.172.1434 http://www.cetaceanbycatch.org/Papers/abundance_franciscana.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cetaceanbycatch.org/Papers/abundance_franciscana.pdf FRANCISCANA WESTERN SOUTH ATLANTIC ABUNDANCE SURVEY-AERIAL CONSERVATION INCIDENTAL CAPTURE text ftciteseerx 2016-01-07T16:03:47Z The franciscana, Pontoporia blainvillei, is endemic to the western South Atlantic Ocean and is perhaps one of the most threatened small cetacean species in this region. This paper presents a first abundance estimate for the coastal waters of Rio Grande do Sul State (southern Brazil) and Uruguay. In March 1996, an aerial survey was conducted along the Rio Grande do Sul State coast. Thirty-four franciscanas (29 groups) were recorded leading to a mean density estimate of 0.657 individuals/km2 (95 % CI: 0.516 to 0.836) for the study area (435km2) after applying a correction factor for submerged dolphins. This corresponds to an estimated abundance of 286 franciscanas (95 % CI: 225 to 364). The study area represents only 0.7 % of the suggested distribution of the stock. The paper discusses possible management implications of this study in the light of reported incidental mortality estimates for this region. Further surveys covering a larger area are recommended in order to obtain more reliable abundance estimates for the stock. Text South Atlantic Ocean Unknown Uruguay |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
FRANCISCANA WESTERN SOUTH ATLANTIC ABUNDANCE SURVEY-AERIAL CONSERVATION INCIDENTAL CAPTURE |
spellingShingle |
FRANCISCANA WESTERN SOUTH ATLANTIC ABUNDANCE SURVEY-AERIAL CONSERVATION INCIDENTAL CAPTURE Eduardo R. Secchi Paulo H. Ott Enrique A. Crespo Paul G. Kinas Susana N. Pedraza A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil |
topic_facet |
FRANCISCANA WESTERN SOUTH ATLANTIC ABUNDANCE SURVEY-AERIAL CONSERVATION INCIDENTAL CAPTURE |
description |
The franciscana, Pontoporia blainvillei, is endemic to the western South Atlantic Ocean and is perhaps one of the most threatened small cetacean species in this region. This paper presents a first abundance estimate for the coastal waters of Rio Grande do Sul State (southern Brazil) and Uruguay. In March 1996, an aerial survey was conducted along the Rio Grande do Sul State coast. Thirty-four franciscanas (29 groups) were recorded leading to a mean density estimate of 0.657 individuals/km2 (95 % CI: 0.516 to 0.836) for the study area (435km2) after applying a correction factor for submerged dolphins. This corresponds to an estimated abundance of 286 franciscanas (95 % CI: 225 to 364). The study area represents only 0.7 % of the suggested distribution of the stock. The paper discusses possible management implications of this study in the light of reported incidental mortality estimates for this region. Further surveys covering a larger area are recommended in order to obtain more reliable abundance estimates for the stock. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Eduardo R. Secchi Paulo H. Ott Enrique A. Crespo Paul G. Kinas Susana N. Pedraza |
author_facet |
Eduardo R. Secchi Paulo H. Ott Enrique A. Crespo Paul G. Kinas Susana N. Pedraza |
author_sort |
Eduardo R. Secchi |
title |
A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil |
title_short |
A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil |
title_full |
A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil |
title_fullStr |
A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil |
title_full_unstemmed |
A first estimate of franciscana (Pontoporia blainvillei) abundance off southern Brazil |
title_sort |
first estimate of franciscana (pontoporia blainvillei) abundance off southern brazil |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.172.1434 http://www.cetaceanbycatch.org/Papers/abundance_franciscana.pdf |
geographic |
Uruguay |
geographic_facet |
Uruguay |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
http://www.cetaceanbycatch.org/Papers/abundance_franciscana.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.172.1434 http://www.cetaceanbycatch.org/Papers/abundance_franciscana.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766200167715831808 |