A note on minke whales (Cetacea: Balaenopteridae) in Uruguay: strandings review

Juri, Eduardo; Valdivia, Meica; Simões-Lopes, Paulo César; Bas, Alfredo Le

doi:10.47536/jcrm.v21i1.203

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Besides stranding records of B. acutorostrata throughout the year, more juveniles and calves occur during the winter and spring in southern Brazil, as reported in a previous review of strandings on the east coast of South America (Milmann et al, 2020) and in Uruguay alone (Juri et al, 2020). The regional peak for neonates and immature individuals in northern Argentina is from March to July and Baldas & Castello (1986) suggested that this region is a nursery and birthing area.…”

Section: Discussionsupporting

confidence: 63%

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: 63%

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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“…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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“…Indeed, all cetacean species harboring this barnacle exploit, at least partially, waters within the 30°N-30°S belt [see 27 ]. In this context, Kasamatsu et al 11 inferred that breeding areas of Antarctic minke whales might be located between 5° and 30°S, and neonates and calves have been spotted within 2-34°S 18 , 19 , 33 , 130 – 132 . Accordingly, the detection of X. globicipitis could be a strong indication of minke whale stays in this latitude range, as some authors have previously suggested 24 , 25 , 35 , 125 , 129 .…”

Section: Discussionmentioning

confidence: 99%

“…Firstly, there are observations of Antarctic minke whales in the Southern Ocean all year round 14 – 16 , and at lower latitudes during the austral summer (e.g. Brazil, South Africa, Uruguay) 10 , 17 , 18 . Secondly, the arrival time to putative wintering and feeding grounds is variable and seems to depend on age and reproductive condition 19 .…”

Section: Introductionmentioning

confidence: 99%

Epibiotic fauna of the Antarctic minke whale as a reliable indicator of seasonal movements

Ten

Konishi²,

Raga

et al. 2022

Sci Rep

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Antarctic minke whales, Balaenoptera bonaerensis, breed in tropical and temperate waters of the Southern Hemisphere in winter and feed in Antarctic grounds in the austral summer. These seasonal migrations could be less defined than those of other whale species, but the evidence is scanty. We quantitatively describe the epibiotic fauna of Antarctic minke whales and explore its potential to trace migrations. Seven species were found on 125 out of 333 examined Antarctic minke whales captured during the last Antarctic NEWREP-A expedition in the Southern Ocean: the amphipod Balaenocyamus balaenopterae (prevalence = 22.2%), the copepod Pennella balaenoptera (0.6%); three coronulid, obligate barnacles, Xenobalanus globicipitis (11.1%), Coronula reginae (8.7%), C. diadema (0.9%); and two lepadid, facultative barnacles, Conchoderma auritum (9.0%) and C. virgatum (0.3%). Species with prevalence > 8% exhibited a modest increase in their probability of occurrence with whale body length. Data indicated positive associations between coronulid barnacles and no apparent recruitment in Antarctic waters. All specimens of X. globicipitis were dead, showing progressive degradation throughout the sampling period, and a geographic analysis indicated a marked drop of occurrence where the minimum sea surface temperature is < 12 °C. Thus, field detection -with non-lethal methodologies, such as drones- of coronulid barnacles, especially X. globicipitis, on whales in the Southern Ocean could evince seasonal migration. Future investigations on geographical distribution, growth rate, and degradation (for X. globicipitis) could also assist in timing whales’ migration.

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A note on minke whales (Cetacea: Balaenopteridae) in Uruguay: strandings review

Cited by 4 publications

References 3 publications

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

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

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

Epibiotic fauna of the Antarctic minke whale as a reliable indicator of seasonal movements

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