Reproductive biology of female common dolphins (Delphinus delphis) in New Zealand waters

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dc.citation.issue12
dc.citation.volume169
dc.contributor.authorPalmer EI
dc.contributor.authorBetty EL
dc.contributor.authorMurphy S
dc.contributor.authorPerrott MR
dc.contributor.authorSmith ANH
dc.contributor.authorStockin KA
dc.contributor.editorCrocker D
dc.coverage.spatialGermany
dc.date.accessioned2024-01-05T01:37:28Z
dc.date.accessioned2024-07-25T06:34:39Z
dc.date.available2022-11-28
dc.date.available2024-01-05T01:37:28Z
dc.date.available2024-07-25T06:34:39Z
dc.date.issued2022-11-20
dc.description.abstractReproductive biology was assessed in 106 female common dolphins (Delphinus delphis) examined post-mortem from stranding and bycatch events along the New Zealand coastline between 1997 and 2019. The average age (ASM) and length (LSM) at sexual maturity was estimated at 7.5 years and 183.5 cm, respectively. The total number of corpora in mature individuals increased with age and appeared to persist throughout life. Ovarian asymmetry was apparent, with the left ovary displaying higher rates of ovulation, and a maximum of 19 corpora recorded for a 24-year-old female. The estimated ovulation and annual pregnancy rates for mature females were 0.39 year-1 and 30%, respectively. Conception and calving occurred year-round, with a weak seasonal increase observed in late austral spring and early austral summer. As these data did not clearly show whether seasonality was present, the gestation, lactation, and resting periods were calculated as either 12.6 or 12.8 months based on the presence/absence of seasonality, respectively. Similarly, calving interval ranged from 3.15 to 3.2 years, depending upon whether seasonality was considered. The estimated LSM of the New Zealand population aligns with other populations globally, although the estimated ASM is younger by approximately 6 months. Other reproductive parameters align with Northern Hemisphere populations, although demonstrate variation, which may reflect adaptations to local conditions such as water temperature and prey availability. As the species is subject to anthropogenic impacts including pollution and bycatch, we suggest our findings be used as a baseline with which to monitor trends in population parameters.
dc.description.confidentialfalse
dc.edition.editionDecember 2022
dc.format.pagination158-
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/36466079
dc.identifier.citationPalmer EI, Betty EL, Murphy S, Perrott MR, Smith ANH, Stockin KA. (2022). Reproductive biology of female common dolphins (Delphinus delphis) in New Zealand waters.. Mar Biol. 169. 12. (pp. 158-).
dc.identifier.doi10.1007/s00227-022-04139-3
dc.identifier.eissn1432-1793
dc.identifier.elements-typejournal-article
dc.identifier.issn0025-3162
dc.identifier.number158
dc.identifier.pii4139
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70450
dc.languageeng
dc.publisherSpringer-Verlag GmbH
dc.publisher.urihttps://link.springer.com/article/10.1007/s00227-022-04139-3
dc.relation.isPartOfMar Biol
dc.rights(c) 2022 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectDensity dependence factors
dc.subjectFisheries interactions
dc.subjectLife history
dc.subjectManagement
dc.subjectReproduction
dc.subjectSDG14
dc.titleReproductive biology of female common dolphins (Delphinus delphis) in New Zealand waters
dc.typeJournal article
pubs.elements-id458517
pubs.organisational-groupOther
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