Preliminary study of movements of harbor porpoises (<i>Phocoena phocoena</i>) in the Bay of Fundy using radiotelemetry

Gaskin, D. E.; Smith, G. J. D.; Watson, Amanda

doi:10.1139/z75-177

Cited by 27 publications

(11 citation statements)

References 5 publications

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“…In the first case, preliminary radiotelemetric tracking studies by Gaskin et al (1975) Can. J. Zool.…”

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confidence: 96%

Age determination of harbour porpoise, Phocoena phocoena (L.), in the western North Atlantic

Gaskin¹,

Blair²

1977

Can. J. Zool.

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1977. Age determination of harbour porpoise, Phocoena phocoena (L.), in the western North Atlantic. Can. J. Zool. 55: 18-30, Age, based on analysis of dentinal growth layers, was determined in a sample of 121 harbour porpoises, Phocoena phocoena (L.), from western North Atlantic waters. One growth layer, consisting of a thick opaque zone and a relatively thin translucent zone, is deposited each year.Mean thicknesses of opaque and translucent zones in males and females were 347 p-m, 114 pm, 432 pm, and 125 pm, respectively. Significant reduction in thicknesses of growth layers with age was found in both sexes, the major contribution in both cases being progressive reduction in thickness of the opaque zones. Translucent-zone thickness decreased with age in males, but significantly increased in thickness in females. Formation of the opaque zone occurs from June through February, and formation of the translucent zone from January to early September. This overlap is attributed to the protracted calving season of this population, and precludes any simple relationship between food supply and zonation, as proposed by others. Age-length relationships based on numbers of dentinal layers were calculated for males and females using regression analysis. Best fits of body length (b) against age (expressed by completeddentinal layers)(d) were obtained from the curvilinear equations: d = [bl(-1.30b + 209.35)]-1 for males, and d = [b/(-0.84b + 156.15)] -1 for females. GASKIN, D. E., et B. A. BLAIR. 1977. Age determination of harbour porpoise, Phocoena phocoenu (L.), in the western North Atlantic. Can. J. Zool. 55: 18-30. C'est par I'analyse des couches de croissance de la dentine qu'on a determine I'ige de 121 marsouins communs Phocoenaphocoena (L.) venant du nord-ouest de I'Atlantique. I1 se depose une couche de croissance chaque annee, constitute d'une zone epaisse opaque et d'une zone translucide assez mince.Chez les miles, les zones opaque et translucide ont des epaisseurs moyennes respectives de 347 p m et 114 pm, alors que chez les femelles ces tpaisseurs sont de 432 pm et 125 pm. On note chez les deux sexes une importante reduction de l'tpaisseur des couches de croissance avec I'ige, cette reduction venant surtout de la diminution progressive de l'epaisseur des zones opaques. L'epaisseur des zones translucides diminue avec I'lge chez les miles, mais augmente significativement chez les femelles. La formation de la zone opaque se fait de juin a fevrier, celle de la zone translucide de janvier au debut de septembre. Ce chevauchement s'explique par la longueur de la saison d'elevage des petits chez cette population, ecartant ainsi I'hypothese, proposee par d'autres auteurs, d'une simple relation entre la zonation et la disponibilitk de la nournture. Une analyse de regression a permis d'ttablir la relation ige-longueur d'apres le nombre de couches de dentine. C'est par les equations suivantes que la relation longueur du corps (b) et ige (exprimee par la totalitt des couches de dentine) (d) s'exprime le mieux: d = [bl(-1.30b + 2...

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“…In the first case, preliminary radiotelemetric tracking studies by Gaskin et al (1975) Can. J. Zool.…”

Section: -! mentioning

confidence: 96%

Age determination of harbour porpoise, Phocoena phocoena (L.), in the western North Atlantic

Gaskin¹,

Blair²

1977

Can. J. Zool.

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“…Wursig andWursig (1979, 1980), also using theodolite tracking, found average swimming speeds of 6.1 km/h for bottlenose dolphins (Tursiops truncatus), and 7.7 km/h for dusky dolphins (La~enorhynchus obscurus) in the South Atlantic. Gaskin et al (1975), using radiotelemetry, found a mean swimming speed of about 2 km/h for slow surfacing harbor porpoises in the Bay of Fundy , New Brunswick. Loeb (1972) and Morejohn (1979) have interpreted slow rolling as sleeping or resting.…”

Section: Swimming Behaviormentioning

confidence: 99%

A study of the behavior of Dall's porpoise (Phocoenoides dalli) in the Johnstone Strait, British Columbia

Jefferson¹

1987

Can. J. Zool.

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JEFFERSON, T. A. 1987. A study of the behavior of Dall's porpoise (Phoc.oenoides dalli) in the Johnstone Strait, British Columbia. Can. J. Zool. 65: 736-744. The behavior of Dall's porpoise was studied in the western Johnstone Strait, British Columbia, during the summer of 1984. Observations and theodolite trackings were made from a cliff-top observation point on West Cracroft Island. Dall's porpoise was the second most common marine mammal in the study area, being seen on 63% of the days, and it was reported to be a year-round resident of the Strait. Three types of surfacing behavior were observed, with slow rolling occurring in 97% of the sightings. Swimming speed of slow rolling porpoises was 5.1 5 0.83 (SD) km/h (n = 18). Dives during travel averaged 35.9 5 26.52 (SD) s (n = 10). Deep vertical dives lasted 2 to 4 min for adults and up to 2 min for calves, and were presumed to be associated with feeding. Westward movement predominated. Dall's porpoises usually showed no obvious reaction to resident killer whales, but apparently swimming speed increases when killer whales are within 2 km. Group sizes ranged from one to over five animals (mean size = 2.6 + 1.05 (SD), n = 68). Groups that included calves tended to be larger than adult-only groups. Neither direction of travel nor time of day were significantly related to group size. The population appears to contain a high percentage of cow-calf pairs, and this suggests that the study area may be used as a calving area during the summer. JEFFERSON, T. A. 1987. A study of the behavior of Dall's porpoise (Phocoenoides dalli) in the Johnstone Strait, British Columbia. Can. J. Zool. 65 : 736-744. Le comportement du Marsouin de Dall a fait l'objet d'une etude dans le ditroit de Johnstone, Colombie-Britannique, au cours de 1'Cti 1984. Un poste d'observation comportant un theodolite a Cte install6 au sommet d'une falaise dans l'ile de West Cracroft.Parmi les mammiferes marins, le marsouin de Dall est le deuxieme plus nombreux dans cette rigion, et des individus ont Ct C observes au cours de 63% des jours d'itude; l'animal habite le dCtroit durant toute I'annie. En surface, les marsouins utilisent trois types de comportement et les roulements lents ont Ct C observis en 97% des cas. La vitesse de nage des marsouins au cours de ces roulements lents a e\C evaluie a 5,l 5 0,83 (ET) km/h (n = 18). Les plongies au cours des dkplacements duraient en moyenne 35,9 5 26,52 (ET) s (n = lo). Les plongies verticales profondes pouvaient durer de 2 a 4 min chez les adultes et jusqu'a 2 min chez les petits; ces plongees semblaient associees a I'alimentation. Les diplacements se faisaient surtout en direction ouest. Les marsouins ne paraissaient pas particulierement affectis par la prCsence d'Epaulards, mais il semble que la vitesse de nage augmente lorsque des Epaulards sont a moins de 2 km. Le nombre de marsouins dans un groupe variait de un a plus de cinq (moyenne = 2,6 2 1'05 (ET), n = 68). Les groupes qui contenaient des petits avaient tendance a etre plus grands que les groupes qui...

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“…Although successful in determining short‐term movements of dolphins, many of these tags caused long‐term dorsal fin damage (Gaskin et al . , Irvine et al . ).…”

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Advances in cetacean telemetry: A review of single‐pin transmitter attachment techniques on small cetaceans and development of a new satellite‐linked transmitter design

Balmer

Wells

Howle

et al. 2013

Marine Mammal Science

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Electronic tags have proven to be valuable tools in assessing small cetacean movement and behavior. However, problems associated with tag size and attachment have limited duration and damaged dorsal fins. These outcomes have motivated researchers to develop a new satellite‐linked tag design that reduces detrimental effects to tagged animals, while increasing transmission durations. The goals of this study were to review previous studies that deployed single‐pin transmitters and determine factors that influence transmission duration. Then, test these factors utilizing computational fluid dynamics (CFD) models to identify an optimal single‐pin satellite‐linked tag design, and evaluate this prototype through field studies. A review of four projects, which deployed 77 single‐pin radio tags, determined that tags attached along the lower third of the dorsal fin and approximately 33 mm from the trailing edge resulted in longer transmission durations and reduced negative impacts to the dorsal fin. Based upon these results and CFD modeling, prototype, single‐pin satellite‐linked tags (n = 25) transmitted for 163 ± 22 d (mean ± 95% CI) which greatly exceeded transmissions for previous small cetacean telemetry studies. These results suggest that the newly developed single‐pin satellite‐linked tag design strikes a balance between reducing impacts to the individual while maximizing transmissions.

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Preliminary study of movements of harbor porpoises (Phocoena phocoena) in the Bay of Fundy using radiotelemetry

Cited by 27 publications

References 5 publications

Age determination of harbour porpoise, Phocoena phocoena (L.), in the western North Atlantic

Age determination of harbour porpoise, Phocoena phocoena (L.), in the western North Atlantic

A study of the behavior of Dall's porpoise (Phocoenoides dalli) in the Johnstone Strait, British Columbia

Advances in cetacean telemetry: A review of single‐pin transmitter attachment techniques on small cetaceans and development of a new satellite‐linked transmitter design

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