Sightings of the western stock of North Pacific right whales (<i>Eubalaena japonica</i>) in the far southeast of the Kamchatka Peninsula

Sekiguchi, Kazuhiko; Onishi, Hideaki; Sasaki, Hidetada; Haba, Shota; Iwahara, Yuka; Mizuguchi, Daisuke; Otsuki, Mayuko; Saijo, Daisuke; Nishizawa, Bungo; Mizuno, Hirona; Hoshi, Nobukazu; Kamito, Takehiko

doi:10.1111/mms.12105

Cited by 5 publications

(6 citation statements)

References 23 publications

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“…There are two distinct populations of NPRW, on the eastern and western sides of the Pacific (Gregr and Coyle, 2009), which are genetically distinct (Pastene et al, 2018). Early estimates based on sightings data suggested the species as a whole totaled 100-200 whales (Wada, 1973;Sekiguchi et al, 2014;Ovsyanikova et al, 2015). For the western stock, surveys by Miyashita and Kato (1998) in summers of 1989, 1990 in the Okhotsk Sea estimated abundance at 922 (95% CI 404-2108).…”

Section: Introduction -Exploitation/devastationmentioning

confidence: 99%

Future Directions in Eubalaena spp.: Comparative Research to Inform Conservation

et al. 2019

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All three extant right whales [Eubalaena australis (Southern; SRW), glacialis (North Atlantic; NARW), and japonica (North Pacific; NPRW)] were heavily exploited, and the status of the two northern hemisphere species remains precarious. Recently, limited gains made by the NARW have been reversed and urgent changes to management approaches are needed if extinction is to be averted. By contrast, some SRW populations are recovering. Given their close phylogenetic relationship, morphological, demographic, and ecological similarities, the contrasting recovery rates between populations and species provide an opportunity to apply a comparative approach to inform the differences in recovery as follows. (1) Recovery: All right whale species were internationally protected in 1931, but NARW, eastern NPRW and some SRW populations have barely recovered from whaling, while others are doing so at maximal rates. Are these differences a legacy of extreme depletion (e.g., loss of genetic diversity and cultural knowledge) or primarily due to anthropogenic factors (e.g., high mortality from ship strike and fisheries entanglement)? If modern anthropogenic threats are not affecting remote SRW populations, can these serve as baseline populations for comparison with NARW and NPRW? (2) Linking individuals to population-level responses: In wild mammals, strong links exist between reproductive indices and environmental conditions within the context of life-history strategies. Individual identification of whales provides the ability to track survival, reproduction and other demographic parameters, and their population-level consequences, providing the tools with which to uncover these links. Robust life-history analyses are now available for NARW and several SRW populations, linking demography with environmental conditions, providing the potential for teasing out important influencing factors. (3) Adapting to shifting resources: Recent reproductive declines in NARW appear linked to changing food resources. While we know some large-scale movement patterns for NARW and a few SRW populations, we know little of mesoscale movements. For NPRW and some SRW populations, even broad-scale movements are poorly understood. In the face of climate change, can methodological advances help identify Eubalaena distributional and migratory responses? (4) Emergent diseases and the vulnerability of populations under stress: Marine mammals are vulnerable to infectious diseases,

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Section: Introduction -Exploitation/devastationmentioning

confidence: 99%

Future Directions in Eubalaena spp.: Comparative Research to Inform Conservation

et al. 2019

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“…, Sekiguchi et al . ). Those surveys were conducted mainly offshore, outside of the Russian 200 nmi exclusive economic zone (EEZ).…”

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confidence: 97%

Opportunistic sightings of the endangered North Pacific right whales (Eubalaena japonica) in Russian waters in 2003–2014

Ovsyanikova

Fedutin

Belonovich

et al. 2015

Marine Mammal Science

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“…), 10 sightings of right whales in five groups were reported in 2012 surveys southeast of the Kamchatka Peninsula and off the Kuril Islands (Sekiguchi et al . ) and there were 19 sightings of 31 whales in the Russian EEZ (mainly around the northern Kuril Islands, the southern Kamchatka Peninsula and the Commander Islands) between 2003 and 2014 (Ovsyanikova et al . ).…”

Section: Methodsmentioning

confidence: 97%

“…However, the Red List documentation concluded that given the very wide confidence intervals and the lack of clear evidence of any recent increase in numbers, the lower end of the range of that abundance estimate (i.e., about 400) should be used for assessment (Reilly et al 2008k). Surveys for large whales in offshore waters east of Hokkaido (Japan) and the Kuril Islands from 1994 to 2013 resulted in 55 sightings of right whales (77 individuals) including ten female/calf pairs (Matsuoka et al 2014), 10 sightings of right whales in five groups were reported in 2012 surveys southeast of the Kamchatka Peninsula and off the Kuril Islands (Sekiguchi et al 2014) and there were 19 sightings of 31 whales in the Russian EEZ (mainly around the northern Kuril Islands, the southern Kamchatka Peninsula and the Commander Islands) between 2003 and 2014 (Ovsyanikova et al 2015). Whales from this subpopulation are occasionally killed incidentally in coastal fishing operations around Japan and Russia (Burdin et al 2004).…”

Section: North Pacific Right Whalementioning

confidence: 99%

Status of the world's baleen whales

Thomas

Reeves

Brownell

2015

Marine Mammal Science

168

135

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Sightings of the western stock of North Pacific right whales (Eubalaena japonica) in the far southeast of the Kamchatka Peninsula

Cited by 5 publications

References 23 publications

Future Directions in Eubalaena spp.: Comparative Research to Inform Conservation

Future Directions in Eubalaena spp.: Comparative Research to Inform Conservation

Opportunistic sightings of the endangered North Pacific right whales (Eubalaena japonica) in Russian waters in 2003–2014

Status of the world's baleen whales

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