Conception, fetal growth, and calving seasonality of harbor porpoise (Phocoena phocoena) in the Salish Sea waters of Washington, USA, and southern British Columbia, Canada

Norman, S.A.; Hanson, M.B.; Huggins, J.; Lambourn, D.; Calambokidis, J.; Cottrell, P.; Greene, A.; Raverty, S.; Berta, S.; Dubpernell, S.; Klope, M.; Olson, J.K.; Jeffries, S.J.; Carrasco, M.; Souze, V.; Elsby, A.; McLean, C.; Carlson, B.; Emmons, C.; Gaydos, J.K.

doi:10.1139/cjz-2017-0155

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

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Conception, fetal growth, and calving seasonality of harbor porpoise (Phocoena phocoena) in the Salish Sea waters of Washington, USA, and southern British Columbia, Canada

2018
By Norman, S.A. ; Hanson, M.B. ; Huggins, J. ; ...
Source: Canadian Journal of Zoology, 96(6), 566-575

[PDF-942.60 KB]

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Journal Title:

Canadian Journal of Zoology
Personal Author:

Norman, S.A. ; Hanson, M.B. ; Huggins, J. ; Lambourn, D. ; Calambokidis, J. ; ... More +

Norman, S.A. ; Hanson, M.B. ; Huggins, J. ; Lambourn, D. ; Calambokidis, J. ; Cottrell, P. ; Greene, A. ; Raverty, S. ; Berta, S. ; Dubpernell, S. ; Klope, M. ; Olson, J.K. ; Jeffries, S.J. ; Carrasco, M. ; Souze, V. ; Elsby, A. ; McLean, C. ; Carlson, B. ; Emmons, C. ; Gaydos, J.K. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NWFSC (Northwest Fisheries Science Center) Less -
Description:

We evaluated harbor porpoise (Phocoena phocoena (Linnaeus, 1758)) strandings in the Salish Sea to determine calving seasonality (1980–2015). A total of 443 strandings were analyzed, of which 134 were calves and 53 were neonates. Stranded calves were reported every month, but peaked in July, August, and September. Based on fetal size and an estimated fetal growth rate of 80 mm/month, mean (±SD) conception date (and range) was back-calculated to 11 October ± 30 days (16 August – 31 December) and was later than in most other studies. Using mean (±SD) length at birth (80 ± 5.8 cm), gestation was estimated to be approximately 10.8 months. Estimated birthing period was 16 July – 27 November, with a mean (±SD) birth date of 10 September (±30.7 days) and a birth length of 80.0 cm. Estimated pregnancy rate (0.28–0.29) is lower than reported in other areas and is likely an underestimate due to missed early embryos, poor postmortem condition of a large proportion of the stranded adult females, and potential biases related to the animals that strand and are available. This study of harbor porpoise reproduction and calving in the Salish Sea is the first assessment of calving seasonality for this species in the northeast Pacific Ocean.
Keywords:

[+]

Animal Science And Zoology Ecology, Evolution, Behavior And Systematics
Source:

Canadian Journal of Zoology, 96(6), 566-575
DOI:

https://doi.org/10.1139/cjz-2017-0155
ISSN:

0008-4301;1480-3283;
Format:

PDF
Publisher:

Canadian Science Publishing
Document Type:

Journal Article
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Other
Rights Statement:

Her Majesty the Queen in right of Canada (Fisheries and Oceans Canada) and the National Oceanic and Atmospheric Administration (NOAA) 2018
Compliance:

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Main Document Checksum:

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urn:sha256:af6c8231e32b32f552e25ebb426f1a795fdf0588a928701c6376170023706ed3
Download URL:

https://repository.library.noaa.gov/view/noaa/54230/noaa_54230_DS1.pdf
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Conception, fetal growth, and calving seasonality of harbor porpoise (Phocoena phocoena) in the Salish Sea waters of Washington, USA, and southern British Columbia, Canada

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