caa a22 4500 386399956 CHVBK 20180307112154.0 cr unu---uuuuu 161130e198910 xx s 000 0 eng 10.1017/S0031182000058704 doi S0031182000058704 pii (NATIONALLICENCE)cambridge-10.1017/S0031182000058704 The role of parasite fecundity and longevity in the success of Trichostrongylus tenuis in low density red grouse populations [Elektronische Daten] The prevalence of the caecal threadworm Trichostrongylus tenuis in red grouse in the north of Scotland was high despite low grouse densities. Prevalence, intensity and aggregation of threadworms was higher in old than in young grouse. Infections were long-lasting: populations of adult worms could survive for over 2 years in grouse, with little mortality. Parasite egg output decreased with the age of a worm population, largely as a result of a decrease in the fecundity of ageing female worms. Seasonal variations in worm fecundity were also evident.However, there was no evidence of an intensitydependent decrease of worm fecundity with increasing worm numbers in either captive or wild grouse. The long life and high reproductive capacity of T. tenuis probably contribute to its effective transmission and high prevalence. Copyright © Cambridge University Press 1989 Trichostrongylus tenuis nationallicence red grouse nationallicence fecundity nationallicence longevity nationallicence Shaw J. L. Zoology Department, Tillydrone Avenue, Aberdeen AB9 2TN, Scotland Moss R. lnstitute of Terrestrial Ecology, Hill of Brathens, Banchory, Kincardineshire AB3 4BY, Scotland Parasitology Cambridge University Press 99/2(1989-10), 253-258 0031-1820 99:2<253 1989 99 PAR https://doi.org/10.1017/S0031182000058704 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0031182000058704 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shaw J. L. Zoology Department, Tillydrone Avenue, Aberdeen AB9 2TN, Scotland NATIONALLICENCE 700 1- Moss R. lnstitute of Terrestrial Ecology, Hill of Brathens, Banchory, Kincardineshire AB3 4BY, Scotland NATIONALLICENCE 773 0- Parasitology Cambridge University Press 99/2(1989-10), 253-258 0031-1820 99:2<253 1989 99 PAR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge