Regression of corpus luteum in cetaceans: A systematic review

Inbaraj, Kanitha Christy; Yu, Zhenpeng; Chai, Simin; Alagamuthu, Karthick Kumar; Rajkumar, V.; Meyyazhagan, Arun; Balasubramanian, Balamuralikrishnan; Gunasekaran, C.; Xu, Shixia; Yang, Guang

doi:10.1016/j.zool.2021.125960

Cited by 1 publication

(1 citation statement)

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“…In contrast, Dabin et al ( 2008 ) suggested most CAs would heal quickly, with a half-life of less than one year and that corpora may not persist over time as the number of CAs did not increase with age past age at sexual maturity in short beaked common dolphins (Dabin et al 2008 ). However, recent research supports our findings as Inbaraj et al ( 2021 ) found through an extensive literature review that most reports of corpora persistence in cetaceans record long-lived corpora . Corpora scars have previously been used as an index of reproductive activity over a female’s lifetime (Perrin and Donovan 1984 ; Murphy et al 2010 , 2018 ).…”

Section: Discussionsupporting

confidence: 93%

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

Palmer

Betty

Murphy³

et al. 2022

Mar Biol

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Reproductive 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.

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