A review of Balaenoptera strandings along the east coast of South America

Milmann, Lucas; Siciliano, Salvatore; Morais, Igor Oliveira Braga de; Tribulato, Andrea Sebastiano; Machado, Rodrigo; Zerbini, Alexandre N.; Baumgarten, Júlio; Ott, Paulo Henrique

doi:10.1016/j.rsma.2020.101343

Cited by 12 publications

(12 citation statements)

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“…In the Southern hemisphere, dwarf common minke whales have been recorded in the Western South Atlantic (WSA) waters of Brazil, Uruguay, Chilean Patagonia and the Antarctic Convergence; in the Western South Pacific (WSP) waters of New Zealand, the northern Great Barrier Reef in Australia and the Antarctic Convergence, and in the Western Indian Ocean of Durban in South Africa (Baker 1983;Best 1985;Arnold et al 1997;Zerbini et al 1997;Capella et al 1999;Acevedo et al 2006;Siciliano et al 2011;Juri et al 2020;Milmann et al 2020). Pastene et al (2010) presented preliminary genetic evidences based on mtDNA of differentiation between WSA and WSP dwarf common minke whales.…”

Section: Introductionmentioning

confidence: 99%

New genetic evidences for distinct populations of the common minke whale (Balaenoptera acutorostrata) in the Southern Hemisphere

Milmann

Taguchi²,

Siciliano

et al. 2021

Polar Biol

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Two minke whale species are recognized, the Antarctic minke (Balaenoptera bonaerensis) and the cosmopolitan common minke (Balaenoptera acutorostrata) whales. The latter is divided into three subspecies: North Pacific (NP) B. a. scammoni, North Atlantic (NA) B. a. acutorostrata, and the Southern Hemisphere 'dwarf' minke whales B. a. unnamed subsp. Genetic variation of two populations of dwarf common minke whales from the Western South Atlantic (WSA) and Western South Pacific (WSP) was assessed through analysis of mitochondrial DNA (mtDNA) control region sequences (313 bp) and microsatellite DNA (msDNA) (11 loci). For comparative purposes, the mtDNA analysis involved samples of Antarctic minke whales, NP, and NA common minke whales. The msDNA analysis included individuals from the WSA, WSP, and NP. There was no shared mtDNA haplotype among common minke whales, and the mtDNA haplotype phylogeny analyses placed WSA in a different cluster from WSP and closer or within the NA clade. The WSA population exhibited the lowest estimates of diversity for both markers. The estimate of Nei's net nucleotide substitution (d A ) between WSA and WSP (0.027) was larger than between WSA and NA (0.014) whales. Significant msDNA differences (based on F ST and D SW ) were found among NP, WSA and WSP, and the pattern of differentiation was similar to that of the mtDNA. Results suggested that the taxonomical status of common minke whales in the Southern Hemisphere should be revised and that regardless of their taxonomical status, dwarf common minke whales from WSA and WSP are unique populations that require separate management for conservation.

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Section: Introductionmentioning

confidence: 99%

New genetic evidences for distinct populations of the common minke whale (Balaenoptera acutorostrata) in the Southern Hemisphere

Milmann

Taguchi²,

Siciliano

et al. 2021

Polar Biol

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“…These results elucidate important aspects regarding the classification of individuals from the species in South America and its stock structure, indicating that individuals from Chile and Peru are connected but separated from those in the Atlantic Ocean (Pastene et al, 2015). Although individuals are probably isolated because their range does not extend further than southern Brazil (~32 o S) at the Southwest Atlantic Ocean (SWAO) (Milmann et al, 2020), future studies should include msDNA analysis and greater number of individuals, specially from the area to elucidate whether the isolation of this population is historical or still ongoing. There is also interest on a better understanding of stock structure of the species in the SWAO because an increase in stranding numbers of Bryde's whale was noticed in southeastern Brazil (Moura & Siciliano, 2012;Milmann et al, 2020).…”

Section: Balaenoptera Brydeimentioning

confidence: 68%

Latin American aquatic mammals: an overview of 12 years focusing on molecular techniques applied to conservation

Castro

Caballero

Cunha

et al. 2023

Lat. Am. J. Aquat. Mamm.

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Ecological information useful for conservation purposes have benefitted from recent and rapid advancements in genetic techniques, revealing unknown aspects of behavior, natural history, population structure and demography of several aquatic mammal species, many of them with conservation concerns. Molecular markers have been used to define management units, to settle taxonomic uncertainties, to control illegal wildlife trade, among others, providing valuable information to decision-making to conserve and manage aquatic mammals. We review genetic studies applied to conservation-related issues involving natural populations of more than 40 species of aquatic mammals in Latin America, covering four taxonomic groups. The main goal was to assess which genetic approaches have been used and to identify gaps in genetic research relating to geographic areas and species. We reviewed studies published in peer-reviewed journals between 2011 and 2022, and found that most were focused on population structure, phylogeography, gene flow and dispersal movements. The review revealed that researchers need to increase and improve the knowledge in those species which face major conservation concern. Scarce findings were related to forensics and its application to wildlife trade. In the era of next-generation-sequencing techniques, just a few studies used genomics as a tool for monitoring gene diversity, an important goal to help us predict how species will cope with climate change events. Looking to the future we suggest which species, geographic areas and genetic studies should be prioritized in a scenario of climate change and increased human threats (e.g., fishery bycatch, habitat degradation, etc.) and the urgent need for conservation actions. Finally, we highlight the benefits of the collaborative works and the necessity of generating a conservation genetic network, with an open agenda to discuss the local and regional problematics. All in all, we strongly emphasize the generation of critical information towards the effective conservation and management of aquatic mammals in Latin America.

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“…Considering this scenario, stranded cetacean carcasses can provide valuable information about the richness and patterns of occurrence of this group in Brazilian waters (Sholl et al 2008;Meirelles et al 2009;Prado et al 2016;Dick et al 2019;Milmann et al 2020), once correctly identified. Therefore, despite some recognized limitations (Galimberti et al 2015), our results reinforce that DNA barcodes, when properly used, can be a valuable tool for the scientific community involved in the stranding networks and to support decision-makers and conservation policies.…”

Section: Discussionmentioning

confidence: 99%

Integrating morphology and DNA barcoding to assess cetacean diversity in Brazil

et al. 2021

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Stranded cetaceans (whales, dolphins, and porpoises) are frequently used to obtain data on species occurrence and demographic trends. Accurate species-level identification of these individuals is crucial, but often challenging or impossible when relying solely on morphological features (e.g., for highly decayed specimens). To aid in the development of a reliable molecular assay for cetacean DNA-based identification, we tested the efficacy of the standardized DNA barcode segment of the coxI gene in identifying cetaceans occurring off the Brazilian coast and in its continental waters. We generated coxI sequences from 150 specimens (collected by 16 Brazilian institutions), most of which included voucher material (skulls, skeletons and/or images) deposited in scientific collections. This allowed a direct comparison between their morphological and molecular identification. CoxI sequences correctly identified ~93% of the samples, comprising 33 species (70% of the 47 cetaceans reported for Brazilian waters). Two species (Berardius arnuxii and Phocoena dioptrica) were sequenced for coxI for the first time. For only two dolphins (Stenella coeruleoalba and S. clymene) and a right whale (Eubalaena australis), coxI failed to identify the species due to overlapping distributions of intra-vs. interspecific divergences. Only one right whale species occurs in the southern hemisphere, facilitating identification in this case. Stenella dolphins present extensive sympatry and potential inter-species hybridization, suggesting that nuclear markers may be required for their reliable identification. These results indicate that DNA barcoding can reliably identify most stranded cetaceans and highlight the importance of voucher materials to validate the construction of a reliable DNA-based identification system.

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A review of Balaenoptera strandings along the east coast of South America

Cited by 12 publications

References 54 publications

New genetic evidences for distinct populations of the common minke whale (Balaenoptera acutorostrata) in the Southern Hemisphere

New genetic evidences for distinct populations of the common minke whale (Balaenoptera acutorostrata) in the Southern Hemisphere

Latin American aquatic mammals: an overview of 12 years focusing on molecular techniques applied to conservation

Integrating morphology and DNA barcoding to assess cetacean diversity in Brazil

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