| fatty acid composition in liver and blubber of the saimaa ringed seal (phoca hispida saimensis) compared with that of the ringed seal (phoca hispida botnica) and grey seal (halichoerus grypus from the baltic. | 1. the main differences in fatty acid composition of blubber between the saimaa seal (phoca hispida saimensis) and the baltic seals (phoca hispida botnica and halichoerus grypus) were, that in fresh water the proportions of polyunsaturated c18 acids and arachidonic acid (20:4 omega 6) were high. 2. the trend became more evident when data on ringed seals from northern oceans were compared with the present data. 3. the proportions of exogenous 20:1 and 22:1 were extremely low in ringed seals from ... | 1993 | 8365111 |
| the impact of parasites on marine mammals: a review. | the design and implementation of conservation plans for marine mammals is a matter of public concern. however, very little is known about the role of parasites in the dynamics of marine mammal populations. this is probably due to methodological constraints concerning sampling biases, poor knowledge of the biology of the hosts and parasites and difficulty and costy of experimental studies. however, current evidence supports the theory that parasites may regulate marine mammal populations. crassic ... | 1997 | 9802082 |
| organochlorine concentrations in the saimaa ringed seal (phoca hispida saimensis) from lake haukivesi, finland, 1981 to 2000, and in its diet today. | organochlorine and mercury (hg) pollution has been one possible reason for a decline in the size of the population of the saimaa ringed seal (phoca hispida saimensis) in lake haukivesi, finland. in this study, we analyzed changes in the concentrations of organochlorine compounds (ocls) and extractable organic halogen (eox) in the blubber of saimaa ringed seals that died from 1981 to 2000. in addition, the present concentrations and biomagnification factors of ocls and hg from the main prey fish ... | 2002 | 12109735 |
| intestinal helminths of a landlocked ringed seal (phoca hispida saimensis) population in eastern finland. | a small, landlocked, endangered ringed seal (phoca hispida saimensis) population lives as a postglacial relict in lake saimaa in eastern finland. in this study, the intestinal metazoans were examined from a total of 61 saimaa seals found dead from 1981 to 2001. the helminth fauna was very depauperate. only one acanthocephalan species, corynosoma magdaleni, has been able to survive during isolation in the freshwater environment. in addition, only two cestode species were found: diphyllobothrium d ... | 2003 | 12884015 |
| vitamins a1 (retinol), a2 (3,4-didehydroretinol) and e (alpha-tocopherol) in the liver and blubber of lacustrine and marine ringed seals (phoca hispida sp.). | concentrations of vitamins a1 (retinol), a2 (3,4-didehydroretinol) and e (alpha-tocopherol) in the liver and blubber of ringed seals from lake saimaa (phoca hispida saimensis), lake ladoga (p. h. ladogensis), the baltic sea (p. h. botnica) and spitsbergen (p. h. hispida) were determined by high-performance liquid chromatography. the freshwater seals had much lower levels of vitamin a1 but higher levels of vitamin a2 than the marine seals. the concentrations of vitamin e in the livers of the subs ... | 1997 | 9080660 |
| the impact of sexual selection on corynosoma magdaleni (acanthocephala) infrapopulations in saimaa ringed seals (phoca hispida saimensis). | in free-living animals sexual selection is a central force shaping the spatial distribution of individuals in a population as well as sexual size dimorphism. we studied the influence of sexual selection on spatial distribution, female-to-male body size ratio, and female mating success of acanthocephalans in a natural host population of saimaa ringed seal (phoca hispida saimensis) harbouring a single intestinal helminth species, corynosoma magdaleni. the acanthocephalans were always found along t ... | 2004 | 15030005 |
| macroscopic anatomy of the saimaa ringed seal (phoca hispida saimensis) lower respiratory tract. | we studied the macroscopic anatomy of the lower respiratory tract of the endangered saimaa ringed seal (phoca hispida saimensis). examination of one adult and one young individual found dead showed that trachea had 85 and 86 complete cartilage rings. the adjacent cartilages exhibited very few random anastomoses. there was variation in the confirmation of the trachea between the cranial and caudal part of the trachea. the right lung was divided by partly incomplete inter-lobar fissures into crani ... | 2016 | 26766601 |
| mercury and selenium balance in endangered saimaa ringed seal depend on age and sex. | the endangered saimaa ringed seal (pusa hispida saimensis) is exposed to relatively high concentrations of mercury (hg) in freshwaters poor in selenium (se), a known antagonist of hg. the impact of age and sex on the bioaccumulation of hg and se was studied by analyzing liver, muscle, and hair samples from seals of different age groups. adult females were found to accumulate significantly more hg in the liver (with ca. 60% as hgse), and less hg in the muscles compared to adult males, which may b ... | 2015 | 26372071 |
| causes and consequences of fine-scale population structure in a critically endangered freshwater seal. | small, genetically uniform populations may face an elevated risk of extinction due to reduced environmental adaptability and individual fitness. fragmentation can intensify these genetic adversities and, therefore, dispersal and gene flow among subpopulations within an isolated population is often essential for maintaining its viability. using microsatellite and mtdna data, we examined genetic diversity, spatial differentiation, interregional gene flow, and effective population sizes in the crit ... | 2014 | 25005257 |
| fatty acid composition of fats around the mystacial and superciliary vibrissae differs from that of blubber in the saimaa ringed seal (phoca hispida saimensis). | 1. adipose tissues associated with the mystacial and superciliary vibrissae of the saimaa seal (phoca hispida saimensis) contained 31% of hexadecenoic acid (16:1 omega 7), which was almost twice the already high amount in blubber. the amount of tetradecenoic acid (14:1 omega 5) was also double that in blubber. 2. at the same time the levels of long-chain highly unsaturated docosapentaenoic (22:5 omega 3) and docosahexaenoic acids (22:6 omega 3) were only two-thirds of those found in blubber. 3. ... | 2016 | 8365110 |