Nonmetric morphometry of the skull of the harbour porpoise, Phocoena phocoena, in the western North Atlantic and eastern North Pacific

1996 ◽  
Vol 74 (12) ◽  
pp. 2199-2205 ◽  
Author(s):  
Anli Gao ◽  
D. E. Gaskin
Keyword(s):  
North Atlantic ◽  
North Pacific ◽  
Stepwise Discriminant Analysis ◽  
Common Dolphin ◽  
Phocoena Phocoena ◽  
Delphinus Delphis ◽  
Chi Squared ◽  
Geographical Populations ◽  
The Common ◽  
Contingency Test

A total of 456 skulls of harbour porpoises, Phocoena phocoena, from North American institutions were coded for 40 nonmetric characters. Codes for morphs were arrayed in relative rankings, reflecting trends of variation. Chi-squared contingency test, Kruskal – Wallis one-way analysis of variance, stepwise discriminant analysis (Wilks' method), and jackknife methods were employed in the analyses. The nonmetric cranial characters were not found to be an efficient method to define geographical populations of harbour porpoises. Although differences could be detected by χ2 analysis, no really significant segregation has developed in nonmetric cranial traits between putative subpopulations of harbour porpoises in the western North Atlantic and eastern North Pacific despite the geographical and reproductive isolation of these continental populations. It might result from the species' shorter history compared with that of the common dolphin, Delphinus delphis.

Cadmium Accumulation and Toxicity in The Bottlenose Dolphin Tursiops truncatus, The Common Dolphin Delphinus delphis, and Some Dolphin Prey Species in South Australia.

1998 ◽  
Vol 20 (1) ◽  
pp. 25
Author(s):  
M. Long ◽  
R.J. Reid ◽  
C.M. Kemper
Keyword(s):  
Tursiops Truncatus ◽  
Tooth Development ◽  
South Australia ◽  
Cadmium Accumulation ◽  
Human Consumption ◽  
Common Dolphin ◽  
Delphinus Delphis ◽  
Wet Weight ◽  
The Common ◽  
The Relationship

Twenty Tursiops truncatus and 20 Delphinus delphis from South Australia were analysed for cadmium levels, as were some fish and squid species which form part of their diet. In the dolphins, cadmium was accumulated mainly in the kidneys (range 0-38 μg/g), with levels in many individuals exceeding 20 μg/g (wet weight). On average, levels in kidney were three-fold higher than in liver and 26-fold higher than in muscle. Cadmium concentrations related to dolphin body length, but the relationship with tooth development class was less clear. 80% of the prey fish species analysed from Spencer Gulf exceeded NH & MRC health recommendations of 0.2 μg/g (wet weight) for human consumption. Sepioteuthis australis from upper Spencer Gulf contained significantly higher cadmium levels than Ceduna samples (0.21 ± 0.01 μg/g versus 0.13 ± 0.01 μg/g, p<0.001) (wet weight). On histological examination, 32% of adult dolphin kidneys showed pathological changes, proteinuria being the most common abnormality. High levels of cadmium were found in dolphins from widely spaced locations in South Australia.

scholarly journals Assessing the Impact of Bycatch on Dolphin Populations: The Case of the Common Dolphin in the Eastern North Atlantic

PLoS ONE ◽  
2012 ◽  
Vol 7 (2) ◽  
pp. e32615 ◽  
Author(s):  
Laura Mannocci ◽  
Willy Dabin ◽  
Emmanuelle Augeraud-Véron ◽  
Jean-François Dupuy ◽  
Christophe Barbraud ◽  
...  
Keyword(s):  
North Atlantic ◽  
Common Dolphin ◽  
The Common ◽  
Eastern North Atlantic ◽  
The Impact

Cloning and characterisation of the GH gene from the common dolphin (Delphinus delphis)

2002 ◽  
Vol 127 (3) ◽  
pp. 300-306 ◽  
Author(s):  
Zoitsa Maniou ◽  
O Caryl Wallis ◽  
Michael Wallis
Keyword(s):  
Common Dolphin ◽  
Delphinus Delphis ◽  
Gh Gene ◽  
The Common

Size data and stomach contents of common dolphins, Delphinus delphis, near Plymouth

1986 ◽  
Vol 66 (2) ◽  
pp. 319-322 ◽  
Author(s):  
P. L. Pascoe
Keyword(s):  
Natural History ◽  
Stomach Contents ◽  
British Museum ◽  
Common Dolphin ◽  
Delphinus Delphis ◽  
South West ◽  
Seasonal Basis ◽  
The Common ◽  
Common Dolphins ◽  
Size Data

INTRODUCTIONThe laboratory at Plymouth was notified of the capture of five dolphins in a commercial trawl on 9 December 1982, three of the specimens were living and therefore immediately released. The remaining two were brought to the laboratory, identified as Delphinus delphis Linnaeus, 1758, their size and sex were recorded and the stomachs removed for examination of their contents. The exact location of capture was not recorded, but is known to be within 40 miles of Plymouth.Reports of strandings of D. delphis collected by the British Museum (Natural History), (Harmer, 1914–27; Fraser, 1934, 1946, 1953, 1974) and more recent recorded sightings (Evans, 1980) show that the common dolphin is clearly not rare in British waters. Although the species has been recorded off all British coasts, sightings and strandings are concentrated off the south and south-west coasts of Britain and Ireland. The variation in their numbers and distribution both during this century and on a seasonal basis each year has been accounted for mainly by the fluctuation and movement of their food supply (Evans, 1980; Sheldrick, 1976).

scholarly journals Distribution and habitat modelling of common dolphins (Delphinus delphis) in the eastern North Atlantic

2019 ◽  
Vol 99 (06) ◽  
pp. 1443-1457 ◽  
Author(s):  
Ana M. Correia ◽  
Ágatha Gil ◽  
Raul Valente ◽  
Massimiliano Rosso ◽  
Graham J. Pierce ◽  
...  
Keyword(s):  
North Atlantic ◽  
Chlorophyll Concentration ◽  
Temporal Distribution ◽  
Distribution Patterns ◽  
Encounter Rate ◽  
Common Dolphin ◽  
North West ◽  
Delphinus Delphis ◽  
Eastern North Atlantic ◽  
Common Dolphins

AbstractThe eastern North Atlantic (ENA) has many highly productive areas where several species of cetaceans have been recorded, with the common dolphin (Delphinus delphis) being one of the most frequently sighted species. However, its spatial and temporal distribution in high seas is poorly known. The study presents the results from 5 years of cetacean monitoring in the ENA (2012–2016) aboard cargo ships that follow the routes from Continental Portugal to the Macaronesian archipelagos and north-west Africa. Common dolphin was the most frequently sighted cetacean with 192 occurrences registered on effort and an overall encounter rate of 0.36 sightings/100 nmi. The species was distributed in coastal and offshore waters, but absent from the Canaries and Cape Verde islands. Statistical ‘habitat’ models were developed to describe and explain the occurrence of sightings of the species: variables affecting detection of dolphins had a small impact and there were clear spatiotemporal distribution patterns, influenced to some degree by environmental variables. Predicted probability of occurrence was highest in coastal waters of continental Portugal and around the Azores. The models, combined with maps of distribution, were useful to identify important areas for the species, which could be the focus of future conservation efforts. Common dolphin presence was related to depth, distance to coast and seamounts, seabed slope, chlorophyll concentration, sea-surface temperature and sea level anomalies; the possible ecological significance of these relationships is explored.

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