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| Content Provider | Springer Nature Link |
|---|---|
| Author | Sinisalo, Tuula Kunnasranta, Mervi Valtonen, E. Tellervo |
| Copyright Year | 2003 |
| Abstract | 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 ditretum and Schistocephalus sp. However, neither of these larvae developed in the ringed seals. As the newborn pups of Saimaa seals are nursed for about 2 months only one of them was infected by C. magdaleni. At 2–5 months the pups harboured worms; however, the mean intensity did not rise distinctively until the seals were adults. C. magdaleni infection increased with increasing age and the abundances were significantly different between the age groups. There was no correlation between the number of parasites and the adult seal body weight; however, seals weighing 36 kg or more carried the majority of the worms. The distribution of the parasites was aggregated; six seals carried 65% (n=1,182) of all worms (total n=1,809) and 26 seals were uninfected. Variation in the number of worms in individual seals may indicate differences in feeding behaviour and in the diet of seals, and/or variation in the immune status of the seals. |
| Starting Page | 40 |
| Ending Page | 45 |
| Page Count | 6 |
| File Format | |
| ISSN | 09320113 |
| Journal | Parasitology Research |
| Volume Number | 91 |
| Issue Number | 1 |
| e-ISSN | 14321955 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2003-07-18 |
| Publisher Place | Berlin/Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Infectious Diseases Veterinary Parasitology Insect Science |
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