نتایج جستجو برای: fluid seals

تعداد نتایج: 224569  

2011
Crystal C. Lenky Becky Sjare

The reasons for the decline in some Atlantic salmon (Salmo salar) stocks in Newfoundland and southern Labrador are not fully understood, but many resource users consider predation by seals in rivers and nearshore waters to be a contributing factor. To address these concerns, local ecological knowledge (LEK) interviews with resource users (n = 57) were conducted at 29 rivers throughout the Provi...

Journal: :The Journal of experimental biology 1988
F E Fish S Innes K Ronald

The propulsive motions of swimming harp seals (Phoca groenlandica Erxleben) and ringed seals (Phoca hispida Schreber) were studied by filming individuals in a flume. The seals swam at velocities ranging from 0.6 to 1.42 m s-1. Locomotion was accomplished with alternate lateral sweeps of the hind flippers generated by lateral flexions of the axial body in conjunction with flexion of the flippers...

2014
K. M. MADDEN L. A. FUIMAN T. M. WILLIAMS

Weddell seals are polar predators that must partition their time between many behaviours, including hunting prey at depth and breathing at the surface. Although they have been well studied, little is known about how foraging behaviour changes when access to breathing holes is restricted, such as in the isolated-hole paradigm. The current study took advantage of previously gathered data for seal...

2013
Torsten Mörner Jonas Malmsten Karin Bernodt Sven-Gunnar Lunneryd

BACKGROUND In recent years, the euthanasia of seals has been discussed internationally and concern has been raised regarding the use of rifles, the effect of different calibres, and which calibres are sufficient for humane euthanasia. This study therefore investigated the effect of different firearm calibres on euthanasia of grey seals (Halichoerus grypus) in traps, and provides information for...

2009
Iain C. Field Peter D. Nichols Corey J. A. Bradshaw Mark A. Hindell

When resources are limited or patchy, a species may develop some degree of resource partitioning to reduce intra-specific competition. Development of intra-specific resource partitioning is more pronounced in species with clear phenotypic variation among individuals (e.g. age or sex). Southern elephant seals Mirounga leonina have pronounced sexual dimorphism and range widely in size and foragin...

2012
Joy S. Tripovich Sophie Hall-Aspland Isabelle Charrier John P. Y. Arnould

Australian fur seals breed on thirteen islands located in the Bass Strait, Australia. Land access to these islands is restricted, minimising human presence but boat access is still permissible with limitations on approach distances. Thirty-two controlled noise exposure experiments were conducted on breeding Australian fur seals to determine their behavioural response to controlled in-air motor ...

Journal: :General and comparative endocrinology 2008
Pamela K Yochem Frances M D Gulland Brent S Stewart Martin Haulena Jonna A K Mazet Walter M Boyce

Northern Elephant Seal Skin Disease (NESSD) is a severe, ulcerative, skin condition of unknown cause affecting primarily yearling northern elephant seals (Mirounga angustirostris); it has been associated with decreased levels of circulating thyroxine (T4) and triiodothyronine (T3). Abnormalities of the thyroid gland that result in decreased hormone levels (hypothyroidism) can result in hair los...

Journal: :Journal of wildlife diseases 1993
U Schumacher S Zahler H P Horny G Heidemann K Skirnisson U Welsch

In 1988 and 1989, thousands of harbor seals (Phoca vitulina) died in the North Sea from phocine distemper infection. The morphology of thyroid glands from 40 harbor seals found dead on the North Sea coastlines of Schleswig-Holstein, Federal Republic of Germany, during an epizootic of phocine distemper, was compared with the morphology of thyroid glands from five healthy harbor seals collected i...

2008
Philip Wadler Jeremy Yallop

Language constructs for defining abstract types commonly come in two varieties: those that add and remove seals dynamically as values cross the abstraction boundary, and those that define the boundary statically using a type signature. Abstract types in dynamically-typed languages are generally defined using seals whereas statically-typed languages more typically use a signature; two prominent ...

2012
Luis Aguirre Cervantes Christian Meilicke Jérôme Euzenat

for dissemination) This deliverable reports on the current status of the service implementation for the automatic evaluation of matching tools, and on the final status of those services. These services have been used in the third SEALS evaluation of matching systems, held in Spring 2012 in coordination with the OAEI 2011.5 campaign. We worked mainly on the tasks of modifying the WP12 BPEL work-...

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