Publication Date: 2010.
Rodents that have multi-annual cycles of density are known to have flexible growth strategies, and the "Chitty effect", whereby adults in the high-density phase of the cycle exhibit larger average body mass than during the low phase, is a well-documented feature of cyclic populations. Despite this, there have been no studies that have repeatedly monitored individual vole growth over time from all phases of a density cycle, in order to evaluate whether such variation in body size is due to differences in juvenile growth rates, differences in growth periods, or differential survival of particularly large or small voles. This study compares growth trajectories from voles during the peak, increase and crash phases of the cycle in order to evaluate whether voles are exhibiting fast or slow growth strategies. We found that although voles reach highest asymptotic weights in the peak phase and lowest asymptotes during the crash, initial growth rates were not significantly different. This suggests that voles attain larger body size during the peak phase as a result of growing for longer.
Author affiliation: Burthe, Sarah Janette. University of Liverpool; Reino Unido. Centre for Ecology and Hydrology; Reino Unido
Author affiliation: Lambin, Xavier. University Of Aberdeeen; Reino Unido
Author affiliation: Telfer, Sandra. University of Liverpool; Reino Unido
Author affiliation: Douglas, Alex. University Of Aberdeeen; Reino Unido
Author affiliation: Beldomenico, Pablo Martín. University of Liverpool; Reino Unido. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina
Author affiliation: Smith, Andrew. University of Liverpool; Reino Unido. Murdoch University; Australia
Author affiliation: Begon, Michael. University of Liverpool; Reino Unido
Repository: CONICET Digital (CONICET). Consejo Nacional de Investigaciones Científicas y Técnicas