Parameters of growth and reproduction of white‐beaked dolphins (<i>Lagenorhynchus albirostris</i>) from the North Sea

Galatius, Anders; Jansen, Okka E.; Kinze, Carl Christian

doi:10.1111/j.1748-7692.2012.00568.x

Cited by 14 publications

(21 citation statements)

References 7 publications

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“…For example, Galatius et al . () reported total body lengths of 22 sexually mature males as 2.52–2.90 m, and 17 mature females as 2.42–2.65 m. Therefore, it was not possible to positively determine the sex of most dolphins photographed, and this study does not attempt to describe differences in coloration between males and females of any age class. In addition, we did not investigate color patterns on the flukes because the few photographs of this body part were of insufficient quality.…”

Section: Methodsmentioning

confidence: 95%

“…In a sample of white‐beaked dolphins from the North Sea, sexual maturity was attained at total lengths of between 2.30 m and 2.55 m in males and 2.32 m and 2.38 m in females (Galatius et al . ), while Jansen et al . () and Jansen () reported that immature individuals from Dutch waters measured between 1.70 m and 2.10 m. In a study from the United Kingdom, males measured between 2.50 m and 2.60 m at sexual maturity, and females were between 2.30 m and 2.50 m (Evans and Smeenk ).…”

Section: Methodsmentioning

confidence: 96%

“…2006, Evans and Smeenk , Galatius et al . ). Juvenile: length is about ⅔ to ¾ of adult length, and swimming independently or associated with an adult (Bearzi et al .…”

Section: Methodsmentioning

confidence: 97%

“…) are in line with the results from the North Sea (Galatius et al . , with the exception of a small 214 cm long mature female). Calf: Length is <⅔ of adult length, and consistently escorted by an adult (Shane , Karczmarski , Karczmarski et al .…”

Section: Methodsmentioning

confidence: 99%

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Color patterns in white‐beaked dolphins (Lagenorhynchus albirostris) from Iceland

Bertulli

Galatius

Kinze³

et al. 2016

Marine Mammal Science

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Few studies have examined the natural complex pigmentation patterns of whitebeaked dolphins. From 2002 to 2014, whale-watching trips in Iceland provided a platform of opportunity to collect a large body of photographs of free-ranging individuals from a single area of distribution for this species. Based on 823 images, 571 individuals showing one or more color components were identified, and assigned to the following four age classes: adults (n = 437), juveniles (n = 109), calves (n = 14), and neonates (n = 11). A total of 26 color components were observed and described: seven terms previously applied to white-beaked dolphins, 12 previously applied to other dolphin species, and seven newly defined terms. Results showed that each age class could be positively identified by differences in specific color components, some of which were exclusive. Therefore, color patterns may prove useful in estimating maturity in free-ranging white-beaked dolphins. This tool could be further refined through assessment of a wide sample of freshly stranded specimens of known sex and age, which could reveal new age class-specific components, as well as sexually dimorphic characteristics not seen here. Geographic variation should be investigated by comparing image data sets and stranded animals from different parts of the North Atlantic.

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Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 96%

“…2006, Evans and Smeenk , Galatius et al . ). Juvenile: length is about ⅔ to ¾ of adult length, and swimming independently or associated with an adult (Bearzi et al .…”

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

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Color patterns in white‐beaked dolphins (Lagenorhynchus albirostris) from Iceland

Bertulli

Galatius

Kinze³

et al. 2016

Marine Mammal Science

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“…Total body length of animals from the North Sea was 252–290 cm for males ( n = 7) and 242–265 cm for females ( n = 17; Galatius et al . ). Animals off Newfoundland were estimated to reach physical maturity at an average body length of 261 cm for females ( n = 4) and 281 cm for males ( n = 4; Dong et al .…”

Section: Taxonomic Treatment and Species Descriptionsmentioning

confidence: 97%

Taxonomic revision of the dolphin genusLagenorhynchus

Vollmer

Ashe²,

Brownell

et al. 2019

Marine Mammal Science

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Evolutionary relationships among cetaceans within the family Delphinidae have been difficult to resolve due to the high number of species and their relatively rapid radiation. This is the case for the dolphin species currently placed in the genus Lagenorhynchus, and their relations to Cephalorhynchus and Lissodelphis species. Phylogenetic relationships among these species have been investigated using multiple lines of evidence, and that evidence consistently suggests that the six species currently assigned to Lagenorhynchus do not form a monophyletic group. Here, we summarize findings from studies of morphology, genetics, historical biogeography, and acoustics that offer insight into the phylogenetics of these taxa. We present the taxonomic basis for revision of Lagenorhynchus, propose retention of Lagenorhynchus albirostris and reassignment of the remaining five species into other existing generic names, namely Leucopleurus acutus, Sagmatias australis, Sagmatias cruciger, Sagmatias obliquidens, and Sagmatias obscurus. Making these revisions now so that the taxonomy better reflects evolutionary relationships among these species will ensure that future studies include the most appropriate taxa for investigating the 1 957 complex phylogenetic and systematic relationships among cetaceans. However, comprehensive analyses using multiple lines of evidence are still needed to clarify the phylogenetic relationships within and among the Lissodelphininae genera Cephalorhynchus, Lissodelphis, and Sagmatias.

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