Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales
Data from Bering-Chukchi-Beaufort Seas bowhead whales (Balaena mysticetus), harvested during 1973–2021 by aboriginal subsistence hunters, were used to estimate reproductive parameters: length at sexual maturity (LSM), age at sexual maturity (ASM), pregnancy rate (PR), and calving interval. Sexual ma...
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2024
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ftcdlib:oai:escholarship.org:ark:/13030/qt051859tc 2024-09-15T17:57:11+00:00 Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales George, John C Craig Givens, Geof H Horstmann, Lara Suydam, Robert Scheimreif, Kayla Stimmelmayr, Raphaela Sheffield, Gay Sformo, Todd L Person, Brian Von Duyke, Andrew Sousa, Leandra Frantz, Rita M Tarpley, Raymond 2024-04-01 application/pdf https://escholarship.org/uc/item/051859tc https://escholarship.org/content/qt051859tc/qt051859tc.pdf https://doi.org/10.1111/mms.13079 unknown eScholarship, University of California qt051859tc https://escholarship.org/uc/item/051859tc https://escholarship.org/content/qt051859tc/qt051859tc.pdf doi:10.1111/mms.13079 public Marine Mammal Science, vol 40, iss 2 Ecological Applications Environmental Sciences Women's Health Reproductive health and childbirth age at sexual maturity Arctic birth interval bowhead whale calving interval fetus length at sexual maturity pregnancy rate productivity reproduction Ecology Evolutionary Biology Zoology Marine Biology & Hydrobiology article 2024 ftcdlib https://doi.org/10.1111/mms.13079 2024-07-18T23:40:55Z Data from Bering-Chukchi-Beaufort Seas bowhead whales (Balaena mysticetus), harvested during 1973–2021 by aboriginal subsistence hunters, were used to estimate reproductive parameters: length at sexual maturity (LSM), age at sexual maturity (ASM), pregnancy rate (PR), and calving interval. Sexual maturity (N=187 females) was determined from the presence/absence of corpora in the ovaries, or a fetus. Using sampling bias-corrected logistic regression, LSM was estimated at 13.5 m, 95% CI [13.0, 13.8]. There was a downward trend in LSM over time, statistically significant with one method but marginal with another. A growth model translated this estimate to an ASM estimate of 23.5 years, 95% CI [20.4, 26.7]. Pregnancy rate was determined from mature females (N=125), and from a subset limited to certain autumn-caught whales (n=37) to reduce bias. The PR was estimated at 0.46 globally, 95% CI [0.36, 0.55] and 0.38 for the autumn sample, 95% CI [0.20, 0.51]. Both estimated PRs are consistent with a 3-year calving interval, because the larger estimate includes two cohorts of pregnant whales harvested in spring, and bowhead whale gestation is longer than 12 months. These analyses represent the most conclusive empirical estimates of ASM, LSM, and PR for this bowhead whale stock from the largest available data sets to date. Article in Journal/Newspaper Balaena mysticetus bowhead whale Chukchi University of California: eScholarship Marine Mammal Science 40 2 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Ecological Applications Environmental Sciences Women's Health Reproductive health and childbirth age at sexual maturity Arctic birth interval bowhead whale calving interval fetus length at sexual maturity pregnancy rate productivity reproduction Ecology Evolutionary Biology Zoology Marine Biology & Hydrobiology |
spellingShingle |
Ecological Applications Environmental Sciences Women's Health Reproductive health and childbirth age at sexual maturity Arctic birth interval bowhead whale calving interval fetus length at sexual maturity pregnancy rate productivity reproduction Ecology Evolutionary Biology Zoology Marine Biology & Hydrobiology George, John C Craig Givens, Geof H Horstmann, Lara Suydam, Robert Scheimreif, Kayla Stimmelmayr, Raphaela Sheffield, Gay Sformo, Todd L Person, Brian Von Duyke, Andrew Sousa, Leandra Frantz, Rita M Tarpley, Raymond Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales |
topic_facet |
Ecological Applications Environmental Sciences Women's Health Reproductive health and childbirth age at sexual maturity Arctic birth interval bowhead whale calving interval fetus length at sexual maturity pregnancy rate productivity reproduction Ecology Evolutionary Biology Zoology Marine Biology & Hydrobiology |
description |
Data from Bering-Chukchi-Beaufort Seas bowhead whales (Balaena mysticetus), harvested during 1973–2021 by aboriginal subsistence hunters, were used to estimate reproductive parameters: length at sexual maturity (LSM), age at sexual maturity (ASM), pregnancy rate (PR), and calving interval. Sexual maturity (N=187 females) was determined from the presence/absence of corpora in the ovaries, or a fetus. Using sampling bias-corrected logistic regression, LSM was estimated at 13.5 m, 95% CI [13.0, 13.8]. There was a downward trend in LSM over time, statistically significant with one method but marginal with another. A growth model translated this estimate to an ASM estimate of 23.5 years, 95% CI [20.4, 26.7]. Pregnancy rate was determined from mature females (N=125), and from a subset limited to certain autumn-caught whales (n=37) to reduce bias. The PR was estimated at 0.46 globally, 95% CI [0.36, 0.55] and 0.38 for the autumn sample, 95% CI [0.20, 0.51]. Both estimated PRs are consistent with a 3-year calving interval, because the larger estimate includes two cohorts of pregnant whales harvested in spring, and bowhead whale gestation is longer than 12 months. These analyses represent the most conclusive empirical estimates of ASM, LSM, and PR for this bowhead whale stock from the largest available data sets to date. |
format |
Article in Journal/Newspaper |
author |
George, John C Craig Givens, Geof H Horstmann, Lara Suydam, Robert Scheimreif, Kayla Stimmelmayr, Raphaela Sheffield, Gay Sformo, Todd L Person, Brian Von Duyke, Andrew Sousa, Leandra Frantz, Rita M Tarpley, Raymond |
author_facet |
George, John C Craig Givens, Geof H Horstmann, Lara Suydam, Robert Scheimreif, Kayla Stimmelmayr, Raphaela Sheffield, Gay Sformo, Todd L Person, Brian Von Duyke, Andrew Sousa, Leandra Frantz, Rita M Tarpley, Raymond |
author_sort |
George, John C Craig |
title |
Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales |
title_short |
Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales |
title_full |
Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales |
title_fullStr |
Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales |
title_full_unstemmed |
Reproductive parameters of Bering‐Chukchi‐Beaufort Seas bowhead whales |
title_sort |
reproductive parameters of bering‐chukchi‐beaufort seas bowhead whales |
publisher |
eScholarship, University of California |
publishDate |
2024 |
url |
https://escholarship.org/uc/item/051859tc https://escholarship.org/content/qt051859tc/qt051859tc.pdf https://doi.org/10.1111/mms.13079 |
genre |
Balaena mysticetus bowhead whale Chukchi |
genre_facet |
Balaena mysticetus bowhead whale Chukchi |
op_source |
Marine Mammal Science, vol 40, iss 2 |
op_relation |
qt051859tc https://escholarship.org/uc/item/051859tc https://escholarship.org/content/qt051859tc/qt051859tc.pdf doi:10.1111/mms.13079 |
op_rights |
public |
op_doi |
https://doi.org/10.1111/mms.13079 |
container_title |
Marine Mammal Science |
container_volume |
40 |
container_issue |
2 |
_version_ |
1810433361222565888 |