Two genera of lung nematodes were found in a sample of 382 wild ringed seals (Phoca hispida). Otostrongylus circumlitus were found mainly in young of the year where they occupied the main stem bronchi causing extensive mucus production, mucosal hyperplasia and peribronchitis. Immature stages of the nematode were found in pulmonary vessels causing endarteritis. There was only a slight reduction in respiratory parenchyma in infected seals and no correlation between infection and size or body condition. However, the sharp decline of O. circumlitus infection from 32% in young of the year to 0.5% after the first winter suggests that this parasite may play a role in the population dynamics of ringed seals. Filaroides (Parafilaraides) hispidus was found in alveoli of seals throughout all age classes causing no significant lesions. The infection rate increased from 44 to 71% in the 7 to 13-yr-old animals and declined to 38% in older seals. Concurrent infections occurred in 28% of young of the year seals.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.