Thoracic anatomy of the Baikal seal, compared with some other phocid seals

1990 ◽  
Vol 68 (1) ◽  
pp. 168-182 ◽  
Author(s):  
Margie D. Koster ◽  
Keith Ronald ◽  
Peter van Bree
Keyword(s):  
Ringed Seal ◽  
Harp Seal ◽  
Muscle Attachment ◽  
Phocid Seals ◽  
Anatomy Of The Neck ◽  
Advanced Development

While undertaking the descriptive dissection of a Baikal seal (Phoca sibirica), the anatomy of the neck, thorax, and pectoral limbs were compared with that of a ringed seal, two harp seals, and two grey seals. Comparison of the myology showed the Baikal and the ringed seal to be the most similar, whereas the harp seals had more muscular subdivisions than the previous two species. The nonlobate lungs of the harp seal indicate a more advanced development. The grey seals were generally more robust with more pronounced areas of muscle attachment. Skeletal characteristics of the pectoral limb indicate that this species is the most primitive of the four.

Heartworm, Acanthocheilonema spirocauda (Leidy, 1858), infections in Canadian phocid seals

1997 ◽  
Vol 54 (4) ◽  
pp. 842-846 ◽  
Author(s):  
L N Measures ◽  
J -F Gosselin ◽  
E Bergeron
Keyword(s):  
Atlantic Coast ◽  
Host Record ◽  
Geographic Area ◽  
Ringed Seal ◽  
New Host ◽  
Hooded Seal ◽  
New Host Record ◽  
Ringed Seals ◽  
Phocid Seals ◽  
The Right

Heartworm, Acanthocheilonema spirocauda, was observed in four of six species of seals (19 seals of 701) examined from the Atlantic coast of Canada including the Canadian Arctic. Fourteen of 221 ringed seals (Phoca hispida), 2 of 18 harbour seals (Phoca vitulina), 2 of 186 harp seals (Phoca groenlandica) (new host record), and the only hooded seal examined (Cystophora cristata) were infected with A. spirocauda. Intensity of infection ranged from 1 to 31. Infected seals were age 0 to 14, but 8 of the 14 infected ringed seals were age 0. All worms were found in the right ventricle except in three cases. In one ringed seal and one harp seal, worms were found in the pulmonary artery, and in another ringed seal, worms were found deep within the lungs. No infections were found in grey seals (Halichoerus grypus) (N = 271) or bearded seals (Erignathus barbatus) (N = 4). Heartworm is primarily a parasite of young seals. Its apparent absence in grey seals examined to date suggests either that a much larger sample of young seals from a broad geographic area is needed or that grey seals are refractory to infection or do not survive infections.

Fatty acid composition of blubber from the four species of Bering Sea phocid seals

1979 ◽  
Vol 57 (1) ◽  
pp. 189-195 ◽  
Author(s):  
George C. West ◽  
John J. Burns ◽  
Marilyn Modafferi
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Bering Sea ◽  
Cold Water ◽  
Ringed Seal ◽  
Interspecific Differences ◽  
Phocid Seals ◽  
Chain Lengths ◽  
The Bering Sea

The fatty acid composition of blubber lipid was analyzed from one example of both sexes of the four species of phocid seals inhabiting the Bering Sea: spotted seal (Phoca vitulina largha), ringed seal (P. hispida), ribbon seal (P. fasciata), and bearded seal (Erignathus barbatus). All specimens had similar fatty acid complements (10 fatty acids predominated, ranging from chain lengths of 14 to 22 carbons with zero lo six double bonds) although there were specific differences among species and between sexes. The greatest interspecific differences in blubber fatty acid composition occurred in the ringed seal and may have been due to diet.Double-bond indices (indicating degree of unsaturation) were high in all samples and higher than those calculated for Atlantic or southern hemisphere seals. Melting points of the blubber lipid ranged from −2 to −8 °C for some components; all components melted below 15 °C correlating with expected peripheral blubber temperatures of seals in cold water of the Bering Sea.

scholarly journals ECOLOGICAL AND ENVIRONMENTAL-PHYSIOLOGICAL RESEARCHES OF PINNIPEDS OF BARENTS, WHITE AND KARA SEAS IN 2015–2019

2020 ◽  
Vol 11 (4) ◽  
pp. 198-214
Author(s):  
N.N. Kavtsevich ◽  
◽  
I.A. Erokhina ◽  
V.N. Svetochev ◽  
O.N. Svetocheva ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Satellite Telemetry ◽  
Ringed Seal ◽  
Harp Seal ◽  
The Arctic ◽  
Bearded Seal ◽  
Arctic Seas ◽  
Physiological Studies

A brief review of the most significant ecological and environmental-physiological studies of three species of true seals living in the arctic seas is presented. The results were obtained on the basis of the analysis of materials from the expeditions of Marine Mammals Laboratory in the Barents, White and Kara seas in 2015–2019. Special attention is paid to the application of satellite telemetry as well as hematological,biochemical, cytochemical methods in the study of harp seal, ringed seal, bearded seal.

Estimating the Blubber Content of Phocid Seals

1990 ◽  
Vol 47 (6) ◽  
pp. 1223-1227 ◽  
Author(s):  
Morten Ryg ◽  
Christian Lydersen ◽  
Nina H. Markussen ◽  
Thomas G. Smith ◽  
Nils Are Øritsland
Keyword(s):  
Body Mass ◽  
Standard Error ◽  
Standard Length ◽  
Phoca Vitulina ◽  
Ringed Seal ◽  
Halichoerus Grypus ◽  
Grey Seal ◽  
Phoca Hispida ◽  
Harbour Seals ◽  
Phocid Seals

We have investigated the relationships between percent blubber content and xiphostemal blubber thickness or girth-to-length ratios in ringed seal (Phoca hispida), harp seal (Phoca groeniandica), and grey seal (Halichoerus grypus). The blubber content was significantly correlated with blubber depths and girth-to-length ratios in all three species, in addition, we have developed an estimator for percent blubber content (the LMD-index) based on standard length (L, in meters), body mass (M, in kilograms), and on blubber thickness (d, in meters) measured at a defined position dorsally. From these variables the percent blubber content (B%) can be estimated by the expression B% = 4.44 + 5693 [Formula: see text], with a standard error of the estimate of three percentage units. This index also gave reasonable estimates for blubber content in three harbour seals (Phoca vitulina) and eight bearded seals (Erignatus harbatus).

A comparative study of surface preparations of the organ of Corti of the harp seal (Pagophilus groenlandicus Erxleben 1777) and the ringed seal (Pusa hispida). 1. Sensory cell population and density

1976 ◽  
Vol 54 (1) ◽  
pp. 1-9 ◽  
Author(s):  
F. Ramprashad ◽  
K. Ronald ◽  
J. Geraci ◽  
T. G. Smith
Keyword(s):  
Cell Population ◽  
Hair Cells ◽  
Sensory Cell ◽  
Organ Of Corti ◽  
Ringed Seal ◽  
Outer Hair Cells ◽  
Harp Seal ◽  
Sensory Cells ◽  
Unit Surface Area ◽  
Inner Hair Cells

The surface preparation technique was used to estimate the sensory cell population and density in the organ of Corti of seven harp seals and four ringed seals. The average total of inner hair cells for the harp seal was 3654 (3078–263) as compared with an average total of 3232 (3120–3354) in the ringed seal. The average total number of outer hair cells in the harp seal was 14 318 (12 173 – 15 709) as compared with an average total of 13 497 (12 903 – 14 894).The distribution of outer and inner hair cells showed an increase in density from base to apex. An increase in density of about 21% and 29% was observed in the inner hair cells of the ringed and harp seal. The increase in density for each row of outer hair cells was 21% in the harp seal and 17% in the ringed seal. The density of outer hair cells per unit surface area decreased from a maximum value at the base to about half its value at the apex.The average total sensory cells of seals exceeded the average total sensory cells of both man and dolphin but were within the range of variation of the human.

Morphology of muscle attachment sites and microarhitecture of underlying bone as the markers of physical activities of past populations

2013 ◽  
Author(s):  
Ksenija Djukic ◽  
Petar Milovanovic ◽  
Michael Hahn ◽  
Bjoern Busse ◽  
Michael Amling ◽  
...  
Keyword(s):  
Physical Activities ◽  
Muscle Attachment ◽  
Attachment Sites ◽  
Muscle Attachment Sites

A Methodology of integrated assessment of the investment attractiveness of the priority social and economic development areas

2020 ◽  
Vol 18 (4) ◽  
pp. 780-806 ◽  
Author(s):  
V.A. Yakimova ◽  
S.V. Khmura
Keyword(s):  
Integrated Assessment ◽  
Investment Risk ◽  
Methodological Issues ◽  
Investment Environment ◽  
Social And Economic Development ◽  
Analysis And Synthesis ◽  
Current Assessment ◽  
Development Area ◽  
Internal And External Factors ◽  
Advanced Development

Subject. This article deals with the theoretical and methodological issues of assessing the investment attractiveness of the advanced development areas. Objectives. The article aims to clarify the economic essence of the category Investment Attractiveness of Advanced Development Areas and related categories, and improve the methodological support to assess the investment attractiveness taking into account the characteristics of these areas. Methods. For the study, we used the methods of analysis and synthesis, generalization, analogy, classification, grouping, and systematization. Results. The article presents a methodology for assessing the investment attractiveness of the advanced development areas, taking into account indicators classified under three groups, namely investment potential, investment environment, and investment risk. It also offers recommendations to determine the type of investment attractiveness. Conclusions. Investment attractiveness, as a complex characteristic of the advanced development area, gets formed in the context of the influence of internal and external factors that are quantifiable and qualitatively assessed. To meet the needs of investors, a methodology that includes current assessment and forecasts is needed, indicating the areas of possible investment risk.

Assessment of sensitivity of the efficiency of regional tax spending towards investment attractiveness of the types of economic activity carried out by the residents of advanced development territory

2020 ◽  
pp. 98-110
Author(s):  
Evgeniya Mikhailovna Popova ◽  
Guzel Mukhtarovna Guseinova ◽  
Sergei Borisovich Milov
Keyword(s):  
Economic Activity ◽  
Socioeconomic Development ◽  
Federal District ◽  
Tax Incentives ◽  
Capital Investments ◽  
The Subject ◽  
Investment Process ◽  
The Impact ◽  
Advanced Development

The deficit of subnational budgets and deceleration capital investments in multiple Russian regions increase the relevance of research aimed at improvement of tax incentivizing practice of the regional investment process. The studies focused on determination of the impact of socioeconomic and institutional factors upon the efficiency of investment tax expenses obtained wide circulation within the foreign scientific literature. The subject of this article is the assessment of sensitivity of the efficiency of regional tax expanses towards investment attractiveness of the types of economic activity carried out by the residents of territories of advanced socioeconomic development, created in the subjects of Far Easter Federal District. The scientific novelty and practical values of this research consists in substantiation of the reasonableness of assessment of investment attractiveness of the types of economic activity that are stimulated by tax incentives. Methodology for assessing investment attractiveness is proposed and tested. The conclusion is made that in case of low investment attractiveness of the type of economic activity, which was planned to support by tax incentives, it is required to conduct and additional analysis to avoid unjustified tax expanses.

Sign in / Sign up

Export Citation Format

Share Document