| resistance to abomasal nematodes and individual genetic variability in reindeer. | resistance to parasites is believed to have a widespread influence on demographic and adaptive processes. in systems where parasites impose a fitness cost on their host, heterozygotes may be selected because they are more resistant to parasites than homozygotes. our objective was to assess the relationships between genomewide individual heterozygosity and abomasal nematode burdens in female svalbard reindeer (rangifer tarandus platyrhynchus) after the effects of host age, locality, season, and y ... | 2005 | 16262866 |
| development and application of a delayed-release anthelmintic intra-ruminal bolus system for experimental manipulation of nematode worm burdens. | in order to quantify the impact of parasites on host population dynamics, experimental manipulations that perturb the parasite-host relationship are needed but, logistically, this is difficult for wild hosts. here, we describe the use of a delayed-release anthelmintic delivery system that can be administered when the hosts can be captured and its activity delayed until a more appropriate period in the host-parasite cycle. our model system is svalbard reindeer infected with a nematode parasite, m ... | 2012 | 22417532 |
| dna evidence that marshallagia marshalli ransom, 1907 and m. occidentalis ransom, 1907 (nematoda: ostertagiinae) from svalbard reindeer are conspecific. | the gastro-intestinal parasitic nematodes of ruminants marshallagia marshalli and m. occidentalis are morphs of a single species according to indirect evidence. in this study, their taxonomic status and molecular identification were assessed more directly in isolates from the abomasal nematode community of svalbard reindeer using genetic data. dna sequences of the first and second internal transcribed spacers of nuclear ribosomal rna genes were obtained from individual nematodes by the polymeras ... | 2001 | 11586078 |
| abomasal nematodes of the svalbard reindeer (rangifer tarandus platyrhynchus vrolik). | six species of abomasal nematodes were recovered from svalbard reindeer, marshallagia marshalli and ostertagia grühneri were more prevalent than skrjabinagia lyrata, teladorsagia circumcincta, ostertagia occidentalis and ostertagia trifurcata. of 24 reindeer examined all harbored adult abomasal nematodes. there was no significant difference in intensity of infection between winter (april) and autumn (october) for either adult males or females. in winter, intensity of infection of adult males was ... | 1983 | 6887429 |