期刊
PARASITOLOGY
卷 130, 期 -, 页码 397-403出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0031182004006663
关键词
Lumbricus terrestris; parasitism; Monocystis sp.; life-history trade-off; Gregarinidae; parasite-induced fitness costs
类别
Parasites inflict fitness costs on their hosts, but often the exact reduction in fitness is not Well understood. We investigated the influence of infection by the gregarine genus Monocystis sp. on growth and female investment (cocoon production) of its earthworm host, Lumbricus terrestris. Earthworms (n=81) were observed in a laboratory setting for 8 months, after which parasite load was determined. The results revealed a significant negative relationship between parasite load and growth, yet no association to cocoon production was found. Although the exact nature, strength, and evolutionary consequence of reduced growth are still unclear, the results Lire the first indication for a clear, albeit weak effect of Monocystis on host fitness.
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