Comparative anatomical study of sound production and reception systems in the common dolphin (Delphinus delphis ) and the harbour porpoise (Phocoena phocoena ) heads

2017 ◽  
Vol 47 (1) ◽  
pp. 3-10 ◽  
Author(s):  
M. Arribart ◽  
J. Ognard ◽  
C. Tavernier ◽  
Y. Richaudeau ◽  
C. Guintard ◽  
...  
Keyword(s):  
Sound Production ◽  
Anatomical Study ◽  
Harbour Porpoise ◽  
Common Dolphin ◽  
Phocoena Phocoena ◽  
Delphinus Delphis ◽  
The Common

Long-Term Association Between a Solitary Common Dolphin (Delphinus delphis delphis) and a Harbour Porpoise (Phocoena phocoena)

2017 ◽  
Vol 43 (1) ◽  
pp. 113-115 ◽  
Author(s):  
Conor Ryan ◽  
Greig Macleod ◽  
Cameron Dinsdale ◽  
Stuart Cook
Keyword(s):  
Harbour Porpoise ◽  
Common Dolphin ◽  
Phocoena Phocoena ◽  
Delphinus Delphis

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.

Relation Between Stranding Mortality and Population Abundance of Smaller Cetacea in the Northeast Atlantic Ocean

1975 ◽  
Vol 32 (7) ◽  
pp. 1095-1099 ◽  
Author(s):  
S. G. Brown
Keyword(s):  
Atlantic Ocean ◽  
Harbour Porpoise ◽  
Continuous Series ◽  
Population Abundance ◽  
Phocoena Phocoena ◽  
Northeast Atlantic ◽  
Northeast Atlantic Ocean ◽  
The Common ◽  
Pilot Whales

The most complete and continuous series of stranding records is probably that for the British coasts, comprising 1616 strandings between 1913–72. The common or harbour porpoise (Phocoena phocoena) is most numerous (667 strandings, 41% of total), with 17 other species representing the remaining 59%. These data are related to sightings during two transatlantic yacht races, from a bird observatory off southwest Ireland, and from weather ships. The ratio of Irish sightings to strandings is at least 120:1, the ratio of sightings at weather ship stations to strandings of long-finned pilot whales (Globicephala melaena) is at least 150:1.

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 Bony Nares Air Pressure and Nasal Plug Muscle Activity during Click Production in the Harbour Porpoise, Phocoena Phocoena, and the Bottlenosed Dolphin, Tursiops Truncatus

1983 ◽  
Vol 105 (1) ◽  
pp. 275-282 ◽  
Author(s):  
M. AMUNDIN ◽  
S. H. ANDERSEN
Keyword(s):  
Tursiops Truncatus ◽  
Sound Production ◽  
Harbour Porpoise ◽  
Air Pressure ◽  
Maximum Pressure ◽  
Electromyographic Activity ◽  
Phocoena Phocoena ◽  
Bottlenosed Dolphin ◽  
Considerable Pressure ◽  
Production Mechanisms

Sound production mechanisms have been studied in two delphinid species - the harbour porpoise, Phocoena phocoena (L.), and the bottlenosed dolphin, Tursiops truncatus (Montagu). It was found that, in both species, the click sound production was coupled to a considerable pressure increase in the bony nares. The maximum pressure recorded in Phocoena was approximately 54 kPa and in Tursiops close to 81 kPa; it was equal in time and amplitude in both nares. The nasal plug muscle was found to be active up to 450 ms prior to and during sound production. Sound production without such activity was not seen. The results suggest that an identical mechanism underlies click production in both species, with pressurized air being the driving force and the nasal plug muscle having some active regulating function. Probes were inserted into the bony nares of three harbour porpoises, Phocoena phocoena, and one bottlenosed dolphin, Tursiops truncatus, in order to record air pressure variations together with sound production. Sounds were picked up by a hydrophone manually held to the forehead of the animals. In several of the Phocoena recordings, electromyographic activity in the nasal plug muscle was also recorded.

Asymmetry drives modularity of the skull in the common dolphin (Delphinus delphis)

2018 ◽  
Vol 126 (2) ◽  
pp. 225-239 ◽  
Author(s):  
Morgan Churchill ◽  
Jacob Miguel ◽  
Brian L Beatty ◽  
Anjali Goswami ◽  
Jonathan H Geisler
Keyword(s):  
Common Dolphin ◽  
Delphinus Delphis ◽  
The Common
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