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Université de Neuchâtel

Additive effects of ectoparasites over reproductive attempts in the long-lived alpine swift

Bize, Pierre ; Roulin, Alexandre ; Tella, José L. ; Bersier, Louis-Félix ; Richner, Heinz

In: Journal of animal ecology, 2004, vol. 73, no. 6, p. 1080-1088

1. Parasitism is a non-negligible cost of reproduction in wild organisms, and hosts are selected to partition resources optimally between current and future reproduction. While parents can compensate for the cost of parasitism by increasing their current reproductive investment, such change in resource allocation is expected to carry-over costs on future reproduction. 2. Life...

Université de Neuchâtel

Parasitism and developmental plasticity in Alpine swift nestlings

Bize, Pierre ; Roulin, Alexandre ; Bersier, Louis-Félix ; Pfluger, Dominik ; Richner, Heinz

In: Journal of Tropical Ecology, 2003, vol. 72, no. 4, p. 633-639

1. Development plasticity is a common evolutionary and phenotypic response to poor growth condition, in particular in organisms with determinate growth such as most birds and mammals. Because various body structures can contribute differently to overall fitness, natural selection will adjust the degree of plasticity of each structure to its proportionate contribution to fitness at a given...

Université de Fribourg

Nestling barn owls beg more intensely in the presence of their mother than in the presence of their father

Roulin, Alexandre ; Bersier, Louis-Félix

In: Animal Behaviour, 2007, vol. 74, no. 4, p. 1099-1106

Nestling begging behaviour may be an honest signal of need used by parents to adjust optimally both feeding rate and within-brood food allocation. Although several studies showed that mothers and fathers can be differentially responsive to nestling begging behaviour with one parent showing a stronger tendency to feed the offspring that beg the most, little information is yet available on whether...