Clutch size and malarial parasites in female great tits
作者： Anne Oppliger , Philippe Christe , Heinz Richner
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摘要: life-history models predict an evolutionary trade-off in the allocation of resources to current versus future reproduction. This corresponds, at physiological level, a reproduction or immune system, which will enhance survival and therefore For clutch size, positive correlation between investment eggs subsequent parasite load. In population great tits, we analyzed natural size females prevalence Piasmodium spp., potentially harmful blood parasite. Females that showed, 14 days after hatching nestlings, infection with had significantly larger (9.S ± 0.5 SE, n = 18) than uninfected (8.0 0.2 80), as predicted by trade-off. Clutch was positively correlated Plasmodhm, but brood not. suggests incur higher costs during laying dutch rearing nesdings. Infection status some changed years, these changes were change The link reproductive effort parasitism may represent possible mechanism cost egg production is mediated into thereby be important selective force shaping size.
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