| the prevalence of trichinella sp. in arctic foxes (alopex lagopus) in svalbard. | the prevalence of trichinella sp. in arctic foxes (alopex lagopus) from svalbard was studied from 1983 to 1989. diaphragms of 697 foxes were examined for larvae; 59 foxes (8.5%) were infected. the prevalence of trichinella sp. increased from 4% in juveniles to 36% in foxes aged more than 6 years of age. there were no significant correlations when condition and body weight each were correlated to the occurrence and number of larvae of trichinella sp. more foxes were infected in the northern than ... | 1993 | 8487386 |
| muscular sarcocystosis in two arctic foxes (vulpes lagopus) due to sarcocystis arctica n. sp.: sarcocyst morphology, molecular characteristics and phylogeny. | the arctic fox (vulpes lagopus) is a critically endangered species in norway, and therefore, the small population is closely monitored, and most foxes found dead are subjected to necropsy. in two deceased foxes, thin-walled muscular sarcocysts were first detected in histological sections, and numerous sarcocysts were later found in frozen and thawed muscle samples from fox 1. these sarcocysts measured 1-12 × 0.1-0.25 mm and had closely spaced, short, knob-like protrusions, giving the cysts a ser ... | 2014 | 24297693 |
| rabies in the arctic fox population, svalbard, norway. | arctic foxes, 620 that were trapped and 22 found dead on svalbard, norway (1996-2004), as well as 10 foxes trapped in nenets, north-west russia (1999), were tested for rabies virus antigen in brain tissue by standard direct fluorescent antibody test. rabies antigen was found in two foxes from svalbard and in three from russia. blood samples from 515 of the fox carcasses were screened for rabies antibodies with negative result. our results, together with a previous screening (1980-1989, n=817) in ... | 2011 | 22102665 |
| freeze tolerance, morphology, and rapd-pcr identification of trichinella nativa in naturally infected arctic foxes. | arctic foxes (alopex lagopus) were collected from greenland and svalbard (n = 319). twenty-four were infected with trichinella (7.5%). molecular analysis (random-amplified polymorphic dna polymerase chain reaction) confirmed that all animals were infected with trichinella nativa. motile larvae were found in muscle tissue from all foxes after carcasses had been frozen for 1 yr at -18 c. infective larvae were found in 2 foxes after a total of 4 yr storage at -18 c, which is longer than any previou ... | 1999 | 10207384 |
| comparative nutrient digestibility of arctic foxes (alopex lagopus) on svalbard and farm-raised blue foxes (alopex lagopus). | arctic foxes from svalbard (n=4) and farmed blue foxes (n=4) was used in a digestibility experiment with a high-carbohydrate feed to add more information to the nutritional physiology of the arctic fox, and to compare its digestive capacity with that of the farmed blue fox. the arctic fox has a diet containing mainly protein and fat from mammals and birds, while farmed blue foxes have been exposed to an omnivorous dietary regime for more than 80 generations. the experiment showed in general no d ... | 2003 | 12507608 |
| life history traits in a cyclic ecosystem: a field experiment on the arctic fox. | the reproduction of many species depends strongly on variation in food availability. the main prey of the arctic fox in fennoscandia are cyclic small rodents, and its number of litters and litter size vary depending on the phase of the rodent cycle. in this experiment, we studied if the arctic fox adjusts its reproduction as a direct response to food abundance, in accordance with the food limitation hypothesis, or if there are additional phase-dependent trade-offs that influence its reproduction ... | 2013 | 23512202 |