PARASITE-ASSOCIATED POLYMORPHISM IN A CYCLIC UNGULATE POPULATION

被引:100
作者
GULLAND, FMD
ALBON, SD
PEMBERTON, JM
MOORCROFT, PR
CLUTTONBROCK, TH
机构
[1] UNIV CAMBRIDGE, DEPT GENET, CAMBRIDGE CB2 3EH, ENGLAND
[2] UNIV CAMBRIDGE, DEPT ZOOL, CAMBRIDGE CB2 3EJ, ENGLAND
基金
英国惠康基金;
关键词
D O I
10.1098/rspb.1993.0119
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
An unmanaged population of Soay sheep living on Hirta, St Kilda, Scotland is persistently unstable, fluctuating between about 600 and 1600 individuals. Population crashes occurring approximately every 3 years are primarily due to winter food shortage. In this paper we show that sheep experimentally relieved of their gastrointestinal nematodes (predominantly Teladorsagia spp.) survived a crash better than matched controls, showing that nematode parasites contribute to the probability that a sheep dies in a crash. We also show that over three successive crashes mortality was significantly different between individuals of the three different genotypes at the diallelic adenosine deaminase locus (Ada). FF animals were most likely to die, SS animals had an intermediate probability of dying, and FS animals were least likely to die. Finally, three independent lines of evidence suggest that nematode burdens differ between the three Ada genotypes. First, in August, heterozygous females are less likely to have nematode eggs in their faeces than homozygous females. Second, at lambing, the periparturient rise in faecal egg count was highest in homozygous FF individuals. Finally, during the Autumn mating season, heterozygous males has lower faecal egg counts than homozgyotes, although this relation was complicated by interactions with year and age of male. These results are consistent with the idea that Ada allele frequencies are maintained in the sheep population by parasite-associated selection.
引用
收藏
页码:7 / 13
页数:7
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