Estrutura populacional da Balaenoptera bonaerensis (Burmeister) (Cetacea, Balaenopteridae) nas áreas de reprodução do Oceano Atlântico Sul

Lucena, Alineide

doi:10.1590/s0101-81752006000100009

Cited by 4 publications

(5 citation statements)

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“…Although adults normally have lower mortality rates when compared to young and old individuals in different mammal species (Caughley, 1966), the proportion of juveniles found here and the fact that it is a birth area may indicate the segregation of mature males and females without offspring. Segregation related to age class has been previously suggested for common minke whale in Brazilian waters based on information from strandings and accidentally caught individuals (Zerbini et al, 1997;Secchi et al, 2003), and for Antarctic minke whale based on catch data (Lucena, 2006). The amount of data presented here reinforces this hypothesis of age class segregation, although juveniles and calves of common minke whale are also found in other places in Brazil (e.g., Geise & Borobia, 1988;Siciliano et al 2008;Santos et al, 2010).…”

Section: Discussionsupporting

confidence: 82%

“…The results show that the northern coast of Rio Grande do Sul State is regularly inhabited by species of the genus Balaenoptera, as reported in adjacent areas (Prado et al, 2016) and in offshore waters of the continental slope (Di Tullio et al, 2016). In this context, environmental characteristics that result in high local productivity (Castello et al, 1998;Crespo, 2009) and the geographical position between areas of higher and lower latitudes used by these species at different stages of life (Lucena, 2006;Andriolo et al, 2010) may favor their occurrence in the study area. The low frequency of strandings of Antarctic minke and fin whales could be related to the species' offshore habitat (Di Tullio et al, 2016), which reduces the probability of their carcasses reaching the coast.…”

Section: Discussionsupporting

confidence: 53%

“…Their preferential areas are still a matter of research (e.g., Zerbini et al, 1997;Siciliano et al, 2011;Di Tullio et al, 2016;Tardin et al, 2017). Most of our knowledge about their distribution and occurrence in Brazilian waters comes from oceanographic cruises (Zerbini et al, 2004;Andriolo et al, 2010;Di Tullio et al, 2016), whaling data, incidental catches (Lucena, 2006), and strandings (Zerbini et al, 1997;Siciliano et al, 2004Siciliano et al, , 2011Cypriano-Souza et al, 2017;Milmann et al, 2020). Acoustic research has also provided new insights into the occurrence and distribution of species such as Omura's and Antarctic minke whales in Brazilian waters (e.g., Moreira et al, 2020, Rossi-Santos et al, 2022.…”

Section: Introductionmentioning

confidence: 99%

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Overview of Balaenoptera whales strandings in Southern Brazil from 1993 to 2018

Milmann,

Rosa de Oliveira,

Danilewicz

et al. 2023

Lat. Am. J. Aquat. Mamm.

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The ecology and distribution of most baleen whales are poorly known in Brazilian waters, despite the history of whaling and the recent increase in the research effort. Although stranding data presents some caveats, it is useful to understand patterns of distribution and occurrence and to detect population trends. In this scenario, data from 25 years of a monitoring marine mammal stranding program were used to evaluate the composition and spatial-temporal patterns of Balaenoptera whales in southern Brazil. A stretch of 270 km on the coast of Rio Grande do Sul State (from 29°20’S to 31°21’S) was surveyed year-round between 1993 and 2018. Whales were identified, measured and sex determined whenever possible. Molecular identification through mtDNA analysis was obtained for 22 individuals and confirmed field identification in 17 cases. Forty-eight whales of four species were recorded: common minke whale B. acutorostrata n = 27, Antarctic minke whale B. bonaerensis n = 1, Bryde’s whale B. brydei n = 13, fin whale B. physalus n = 1. In addition, six whales were not identified at species level due to advanced decomposition. The larger number of strandings of common minke and Bryde’s whales may be related to their greater abundance and/or more coastal distribution. Both species were recorded year-round, but strandings of common minke and Bryde’s whales occurred mostly during winter/spring (77.77%) and spring/summer (66.66%), respectively. Although Bryde’s whales appear to remain in southern Brazilian waters during the entire year, the results suggest the existence of seasonal inshore-offshore movements. Moreover, the greater number of strandings of juveniles of common minke whales compared to adults (ratio 1.86:1) and their occurrence in different seasons suggest that some immature individuals may not leave this region, as previously pointed out by other studies. This long-term survey brings new evidence of the importance of this region in the Southwestern Atlantic Ocean for some Balaenoptera species.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

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Overview of Balaenoptera whales strandings in Southern Brazil from 1993 to 2018

Milmann,

Rosa de Oliveira,

Danilewicz

et al. 2023

Lat. Am. J. Aquat. Mamm.

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“…Examination of reproductive organs of whales processed in Costinha showed that both males and females were reproductively active off Brazil (WILLIAMSON 1975, DA ROCHA & BRAGA 1982, LUCENA 2006. Despite that, minke whale calves are not easily observed, which is unusual for an area considered a breeding ground.…”

Section: Discussionmentioning

confidence: 99%

Distribution and relative abundance of large whales in a former whaling ground off eastern South America

Andriolo¹,

Rocha²,

Zerbini³

et al. 2010

Zoologia (Curitiba, Impr.)

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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 most frequently sighted species (97 groups/132 individuals; Sighting Rate [SR] = 0.031 groups/nm), being recorded only in offshore waters. Density gradually increased from August to October. Minke whales were distributed throughout the area, both to the north and the south of former whaling ground. Sighting data indicate this is the most abundant species, particularly in the area beyond the continental shelf break. Breeding behavior was observed for Antarctic minke whales, but few groups containing calves were recorded (4.3% of the groups sighted on effort). Three other large whale species were recorded in low numbers: the Bryde's whale - Balaenoptera edeni (Anderson, 1879)¹; the sei whale, B. borealis (Lesson, 1828), and the sperm, Physeter macrocephalus (Linnaeus, 1758). Sei, Bryde and sperm whales were regularly caught during whaling operations, but are rare in the area, suggesting they were depleted by whaling and have yet to recover to their pre-explotation abundance. In contrast, minke whales are abundant in this area, suggesting that either they were not substantially depleted, or that they have recovered rapidly. Blue whale, Balaenoptera musculus (Linnaeus, 1758), and fin whale, B. physalus (Linnaeus, 1758), not recorded on our surveys, have always been extremely rare in the area

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“…In Brazil, the northeast region has been considered a breeding area for the species (Horwood, 1990;Lucena, 2006), and individuals are often sighted in oceanic waters between 200 and 1,000 m depth and in greater numbers between August and October (Andriolo et al, 2010). This species is listed as data deficient by the International Union for Conservation of Nature (IUCN) (Reilly et al, 2008), and it is currently the most abundant mysticete in the Southern Hemisphere (Beekmans et al, 2010).…”

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confidence: 99%