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Registros recuperados: 5
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Distribution and relative abundance of large whales in a former whaling ground off eastern South America Rev. Bras. Zool.
Andriolo,Artur; Rocha,Jesuina M. da; Zerbini,Alexandre N.; Simões-Lopes,Paulo C.; Moreno,Ignacio B.; Lucena,Alineide; Danilewicz,Daniel; Bassoi,Manuela.
Ship-based sighting surveys for cetaceans were conducted in the former whaling ground off the northeastern coast of Brazil. The cruises took place in winter and spring of 1998-2001 with the objectives of investigating current distribution and abundance of cetaceans, particularly large whale species taken during whaling. In 1998 the survey were conducted between the parallels 5°30'W and 9°S and the 200 m isobath and the meridian 033°W. A total of about 3,100 nm were surveyed between 1998 and 2001 Surveys were conducted using line transect methods from about 5-10°S, and from the coast to 33°W. A total of 151 sightings (203 individuals) of large whales were recorded on effort. The Antarctic minke whale - Balaenoptera bonaerensis (Burmeister, 1867) was the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bryde's whale; Minke whale; Sei whale; Sperm whale; South Atlantic.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500011
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Evidences of attack of a killer whale on a calf southern right whale in southern Brazil Mastozool. neotrop.
Ott,Paulo H; Sucunza,Federico; Wickert,Janaína; Danilewicz,Daniel; Tavares,Maurício.
La orca (Orcinus orca) presenta una distribución global y una gran variación en los hábitos tróficos de sus poblaciones. En el Océano Atlántico Sur, el conocimiento sobre la distribución y la dieta de la especie es todavía escaso. En este trabajo, presentamos la primera evidencia de ataque de una orca a una ballena franca austral (Eubalaena australis) en aguas brasileñas y reportamos nuevos registros de avistamientos de orcas en aguas costeras de la región más austral de Brasil.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Eubalaena australis; Interacción predador-presa; Marcas de dientes; Orcinus orca; Varamiento.
Ano: 2017 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832017000100020
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Humpback whale Megaptera novaeangliae (Cetartiodactyla: Balaenopteridae) group sizes in line transect ship surveys: An evaluation of observer errors Rev. Bras. Zool.
Bortolotto,Guilherme A.; Danilewicz,Daniel; Andriolo,Artur; Zerbini,Alexandre N..
ABSTRACT Accurate estimates of group sizes through line transect sampling methods are important to correctly ascertain the abundance of animals that occur in groups. Since the average observed group size is a component of the distance sampling formula, bias in these data leads to biased abundance estimates. This study aimed to evaluate the potential errors in group size estimation during line transect ship surveys to estimate abundances of the humpback whale, Megaptera novaeangliae (Borowski 1781). In a research cruise along the Brazilian coast, an experiment to collect group size information was conducted from two different sighting platforms on the same vessel. Group sizes were recorded by primary observers at first sighting (PO1) and, in some cases,...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Abundance; Bias; Conservation; Distance sampling; Mysticetus.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000204001
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Movement patterns of humpback whales (Megaptera novaeangliae) reoccupying a Brazilian breeding ground Biota Neotropica
Gonçalves,Maria Isabel Carvalho; Sousa-Lima,Renata Santoro de; Teixeira,Niel Nascimento; Carvalho,Gustavo Henrique; Danilewicz,Daniel; Baumgarten,Júlio Ernesto.
Abstract: The population of humpback whales from breeding stock A is increasing, and little is known about the routes used by humpbacks that move north of the main calving area of Brazil, the Abrolhos Bank. The aim of this study was to describe the movements of humpback whales in a reoccupation wintering area (Serra Grande, Bahia state, Brazil) based on land-based surveys to test if movement patterns change during the season and between years, due to group composition, behavioral state, and distance to the coast. The mean leg speed of the groups sighted was 6.88 (±2.92) km/h, and leg speed was positively correlated with distance to the coast. There was an increase in leg speed and distance to the coast with increasing number of escorts in the groups with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calving area; Distance to the coast; Land-based station; Linearity; Speed.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000400210
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What do humpback whales Megaptera novaeangliae (Cetartiodactyla: Balaenopteridae) pairs do after tagging? Rev. Bras. Zool.
Andriolo,Artur; Zerbini,Alexandre N.; Moreira,Sergio; Pizzorno,José L.; Danilewicz,Daniel; Maia,Ygor G.; Mamede,Natália; Castro,Franciele R. de; Clapham,Phillip.
The social structure of humpback whales in their tropical wintering grounds is very fluid. To date, no information has been published for cases in which two whales were both satellite-tagged while in association. Here, we report the movements of four humpback whale pairs tagged together off the coast of Brazil. Fieldwork and satellite tagging of humpback whales was conducted between 2003 and 2008 along the eastern coast of Brazil, between 20°S and 8°S. Movement was monitored while whales were still in their breeding ground. A switching state space model was applied to the filtered data of each humpback whale to standardize telemetry data and allow direct comparison of each individual track. GIS was used to plot model-predicted locations and to visually...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cetacean; Large whale; Satellite telemetry; Social behavior; SSSM.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000200001
Registros recuperados: 5
Primeira ... 1 ... Última
 

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