Abstract
Coastal whaling targeting Baird’s beaked whales has a long history, and more than a quarter of a century has passed since the last abundance estimation of this species was conducted for management purposes. Here, we estimated the latest and time series abundances of Baird’s beaked whales in the waters off the Pacific coast of Japan since 2008 using standard line transect analyses. Sighting surveys dedicated to estimating the abundance of Baird’s beaked whales were conducted four times. Additionally, we used the Baird’s beaked whale sighting dataset from a sighting survey targeting baleen whale in 2016. Two types of detection functions with multiple covariates were fitted to sighting data from these surveys. Abundances were estimated using the half-normal model to be 1524 (coefficient of variation, CV = 0.72) in 2008, 1546 (CV = 0.81) in 2009, 1093 (CV = 0.54) in 2015, 1034 (CV = 0.51) in 2016, and 3596 (CV = 0.82) in 2017. Some of these estimates had imperfect coverage, but all estimates sufficiently represented abundances in the main habitat in the study region. Overall, our abundance estimates were smaller than past estimates from the early 1990s, implying that further monitoring of the abundance are needed to manage and conserve populations of Baird’s beaked whales in this region.
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References
Buckland ST, Anderson DR, Burnham KP, Laake JL, Borchers DL, Thomas L (2001) Introduction to distance sampling. Oxford University, Oxford
Buckland ST, Anderson DR, Burnham KP, Laake JL, Borchers DL, Thomas L (2004) Advanced distance sampling - Estimating abundance of biological popilations. Oxford University, Oxford
Hammond PS, Francis TB, Heinemann D, Long KJ, Moore JE, Punt AE, Reeves RR et al (2021) Estimating the abundance of marine mammal populations. Front Mar Sci 8:735770
International Whaling Commission (2012) Requirements and guidelines for conducting surveys and analysing data within the revised management scheme. J Cetacean Res Manag 13:509–517
Kanaji Y, Gerrodette T (2020) Estimating abundance of Risso’s dolphins using a hierarchical Bayesian habitat model: a framework for monitoring stocks of animals inhabiting a dynamic ocean environment. Deep Sea Res 175:104699
Kanaji Y, Miyashita T (2021) Habitat use and habitat overlap of Delphinidae species revealed by mixed-species group occurrence in the North Pacific Ocean. Mar Mamm Sci 37(3):1128–1138
Kanaji Y, Okamura H, Miyashita T (2011) Long-term abundance trends of the northern form of the short-finned pilot whale (Globicephala macrorhynchus) along the Pacific coast of Japan. Mar Mamm Sci 27:477–492
Kanaji Y, Miyashita T, Yoshida H, Okazaki M, Kishiro T (2015) Abundance estimates of dalli-type and truei-type of Dall’s porpoise Phocoenoides dalli in the western central part of the Sea of Okhotsk, July–September between 1990 and 2010. Fish Sci 81:611–619
Kanaji Y, Miyashita T, Minamikawa S, Yoshida H (2018) Abundance estimates of six species of Delphinidae cetaceans off the Pacific coast of Japan between 1985 and 2015. Mar Mamm Sci 34:1034–1058
Kanaji Y, Maeda H, Okamura H, Punt AE, Branch T (2021) Multiple-model stock assessment frameworks for precautionary management and conservation on fishery-targeted coastal dolphin populations off Japan. J Appl Ecol 58:2479–2492
Kasuya T (1986) Distribution and behavior of Baird’s beaked whales Berardius bairdii off the Pacific coast of Japan. Sci Rep Whales Res Inst Tokyo 37:61–84
Kasuya T (2017) Small cetaceans of Japan. Exploitation and biology. CRC Press, Boca Raton
Kasuya T, Miyashita T (1997) Distribution of Baird’s beaked whales off Japan. Rep Int Whal Commn 47:963–968
Kishiro T (2007) Geographical variations in the external body portions of Baird’s beaked whales (Berardius bairdii) off Japan. J Cetacean Res Manag 9:89–94
Laake J, Borchers D, Thomas L, Mille, D, Bishop J (2021) mrds: Mark-recapture distance sampling. R package version 2.2.4. https://github.com/DistanceDevelopment/mrds/
Maeda H and Kishiro T (2021) Baird’s beaked whale, Berardius bairdii, Sea of Japan, Sea of Okhotsk and Pacific Ocean. In: The Current status of international fishery stocks. https://kokushi.fra.go.jp/R03/R03_50_BEW.pdf
Marques FFC, Buckland ST (2003) Incorporating covariates into standard line transect analyses. Biometrics 59:924–935
Matsuoka K, Hakamada T, Moriyama R, Mure H, Abe N, Ohkoshi C, Miyashita T (2017) Cruise report of the Japanese cetacean sighting survey in the western North Pacific in 2011. SC/67a/ASI/05:1–11
Minamikawa S, Iwasaki T, Kishiro T (2007) Diving behaviour of a Baird’s beaked whale, Berardius bairdii, in the slope water region of the western North Pacific: first dive records using a data logger. Fish Oceanogr 16:573–577
Miyashita T (1986) Abundance of Baird’s beaked whales off the Pacific coast of Japan. Rep Int Whal Comm 36:383–386
Miyashita T (1990) Population estimates of Baird’s baked whales off Japan. SC/42/SM28:1–12
Miyashita T, Kato H (1993) Population estimate of Baird’s beaked whales off the Pacific coast of Japan using sighting data collected by R/V Shunyo Maru in 1991 and 1992. SC/45/SM6:1–12
Ohizumi H, Isoda T, Kishiro T, Kato H (2003) Feeding habits of Baird’s beaked whale Berardius bairdii, in the western North Pacific and Sea of Okhotsk off Japan. Fish Sci 69:11–20
Okamura H (2003) A line transect method to estimate abundance of long-diving animals. Fish Sci 69:1176–1181
Okamura H, Minamikawa S, Kitakado T (2006) Effect of surfacing patterns on abundance estimates of long-diving animals. Fish Sci 72:631–638
Okamura H, Minamikawa S, Skaug HJ, Kishiro T (2012) Abundance estimation of long-diving animals using line transect methods. Biometrics 68:504–513
Omura H, Fujino K, Kimura S (1955) Beaked whale Berardius bairdii of Japan, with notes on Ziphius cavirostris. Sci Rep Whales Res Inst 10:89–132
R Core Team (2020) R: A language and environment for statistical computing. https://www.r-project.org/
Thewissen JGM (2018) Berardius beaked whales. In: Würsig B, Thewissen JGM, Kovacs KM (eds) Encyclopedia of marine mammals. Elsevier, pp 97–99
Wade PR (1998) Human-caused mortality of cetaceans and pinnipeds. Mar Mamm Sci 14:1–37
Acknowledgements
The sighting survey was supported from the Japan Fisheries Research and Education Agency and the Institute of Cetacean Research. We express our sincere thanks to the captains, crews and researchers who were involved in these surveys. We also thank Dr. Toshiya Kishiro and Dr. Hideyoshi Yoshida for useful comments on early version of the analysis and manuscripts. We also thank our colleagues for their support.
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Sasaki, H., Kanaji, Y., Hakamada, T. et al. Estimating the abundance of Baird’s beaked whales in waters off the Pacific coast of Japan using line transect data (2008–2017). Fish Sci 89, 439–447 (2023). https://doi.org/10.1007/s12562-023-01698-2
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DOI: https://doi.org/10.1007/s12562-023-01698-2