Age and reproduction of the finless porpoises,<i>Neophocaena asiaeorientalis</i>, in the Yellow Sea, Korea

An, Yong Rock; Park, Kyum Joon; Sohn, Hawsun; An, Du Hae; Kim, Su Am

doi:10.1080/19768354.2013.851116

Cited by 16 publications

(17 citation statements)

References 8 publications

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“…τ is the crest of the mismatch distribution, which was estimated using Arlequin v.3.11 56 . Lee et al 57 studied the reproduction of N. asiaeorientalis by examining 111 ovaries and testis and suggested that the species would reach sexual maturity above 5 years old. Maximum ages were generally reported to be between 23 and 25 58 .…”

Section: Methodsmentioning

confidence: 99%

Phylogeography of the finless porpoise (genus Neophocaena): testing the stepwise divergence hypothesis in the northwestern Pacific

Lin

Frère

Karczmarski

et al. 2014

Sci Rep

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We used 344 mitochondrial control region (717 bp) sequences from the finless porpoise (genus Neophocaena) from the northwestern Pacific to investigate the extent and manner in which past climatic oscillations may have shaped patterns of genetic diversity for this marine mammal. Both SplitsTree and Analysis of Molecular Variance (AMOVA) revealed the presence of a deep divergence among N. phocaenoides in subtropical waters compared with N. asiaeorientalis in temperate waters. Results from Migrate-n indicated that migration increased along the continent during the early Pleistocene period. Migration increased, although to a lesser extent than that during the Pleistocene, along the marginal shelf in the Yellow/Bohai Sea during the Last Glacial Maximum (LGM) due to a shortening coastline. Our results suggest that the current patterns of genetic diversity of Neophocaena vary at a hierarchy on a temporal and spatial scale, and phylogeographic history should be taken into account when examining species population structure and taxonomy.

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Section: Methodsmentioning

confidence: 99%

Phylogeography of the finless porpoise (genus Neophocaena): testing the stepwise divergence hypothesis in the northwestern Pacific

Lin

Frère

Karczmarski

et al. 2014

Sci Rep

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“…The reproductive condition of D. capensis was determined by examining its gonads. Females were considered sexually mature if corpus luteum or corpus albicans was present in the ovaries (Lee 2011). Male specimens whose right testis weighed less than 150 g were classified as immature (Perrin et al 1977).…”

Section: Sample Collectionmentioning

confidence: 99%

Diet of long-beaked common dolphin (Delphinus capensis) in the East Sea, Korea

Ahn

Kim

et al. 2014

Animal Cells and Systems

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The long-beaked common dolphin is one of the most abundant cetaceans in Korean waters, and their population has been estimated to comprise of more than 35,000 individuals. Delphinus capensis generally appear close to the coast and primarily feed on epipelagic small fishes and cephalopods. Thirty long-beaked common dolphins were collected from the East Sea from February to September in 2012. For stomach content analysis (SCA), the fresh prey items were identified to their lowest taxonomic level, and unidentified preys due to digestion were identified using remnants such as fish otoliths and cephalopod beaks. Fatty acid (FA) patterns of 20 dolphins from the inner layer of blubber were compared with those in samples of prey items. Enoploteuthis chunii was the dominant prey in SCA, representing 55.8% by number and 75.9% by occurrence. Common squid (Todarodes pacificus) and Pacific herring (Clupea pallasii) were the next major preys at more than 80% occurrence. Even though a distinctive difference was not observed between genders, there was a significant diet variation related to maturity. Immature dolphins consumed a higher diversity of prey, and consumed more equally than the sexually mature group, who showed a high dominance of cephalopods. Furthermore, this result fairly corresponded to FAs composition of mature dolphins with the raised percent of 20:6n-3, which is relatively abundant in T. pacificus.

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“…Between the East Asian and Yangtze finless porpoises, however, the differences in the reproductive characteristics appear to be insignificant (Gao and Zhou 1993, Chang and Zhou 1995). Both the East Asian and Yangtze finless porpoises show a seasonal breeding rhythm, and parturition occurs mainly from April to July (Gao and Zhou 1993, Wei et al 2002, Chen et al 2006, Wang 2009, Lee et al 2013. The time elapsed between the calving interval (Zhang 1992, Yang et al 1998) and the gestation period (Chang and Zhou 1995) for both subspecies are similar, which indicates comparable lactation duration.…”

Section: Discussionmentioning

confidence: 98%

“…Necropsy examinations on the reproductive tract of the lactating‐female carcasses indicated that the porpoises delivered recently, based on the appearance of an incompletely involuted uterus and newly formed corpus albicans, which was in agreement with parturition mainly occurring from April to July (Gao and Zhou , Lee et al . ).…”

Section: Methodsmentioning

confidence: 97%

Characterization of milk composition in narrow‐ridged finless porpoises (Neophocaena asiaeorientalis) at different lactation stages

Zeng

Huang

Qian

et al. 2017

Marine Mammal Science

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Lactation plays a vital role in reproductive success, evolving with ecological adaptations of mammalian life histories. Knowledge of the lactation process in odontocetes is scarce and limited to a handful of species. We investigated the changes in milk composition across different lactation stages, including prepartum mammary secretion and early, mid‐ and late lactation of narrow‐ridged finless porpoises. Prepartum mammary secretion was greenish and characterized by high protein, low sugar, and negligible fat contents. In contrast, milk fat became predominant over protein and sugar contents throughout all lactation stages. At the early lactation stage, the contents of all milk constituents except water varied greatly. At the mid‐late lactation stage, the gross milk composition was relatively stable and was composed of, on average, 67.34% ± 4.13% water, 9.96% ± 0.75% protein, 21.40% ± 3.24% fat, and 1.72% ± 0.73% sugar. Our findings provide new insight into milk composition at different lactation stages in the narrow‐ridged finless porpoise.

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Age and reproduction of the finless porpoises,Neophocaena asiaeorientalis, in the Yellow Sea, Korea

Cited by 16 publications

References 8 publications

Phylogeography of the finless porpoise (genus Neophocaena): testing the stepwise divergence hypothesis in the northwestern Pacific

Phylogeography of the finless porpoise (genus Neophocaena): testing the stepwise divergence hypothesis in the northwestern Pacific

Diet of long-beaked common dolphin (Delphinus capensis) in the East Sea, Korea

Characterization of milk composition in narrow‐ridged finless porpoises (Neophocaena asiaeorientalis) at different lactation stages

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