Landscape and fine-scale movements of a leaf beetle: the importance of boundary behaviour |
| |
Authors: | Daniel S Chapman Calvin Dytham Geoff S Oxford |
| |
Institution: | (1) Department of Biology, University of York, York, YO10 5YW, UK;(2) IICB, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK |
| |
Abstract: | Movement underpins animal spatial ecology and is often modelled as habitat-dependent correlated random walks. Here, we develop
such a model for the flightless tansy leaf beetle Chrysolina graminis moving within and between patches of its host plant tansy Tanacetum vulgare. To parameterize the model, beetle movement paths on timescales of minutes were observed in uniform plots of tansy and inter-patch
matrix (meadow) vegetation. Movement lasted longer, covered greater distances and had narrower turning angles in the matrix.
Simulations of the model emulated an independent two-season multi-patch mark–resight study at daily timescales and included
variable boundary-mediated behaviour affecting the probability of leaving habitat patches. As boundaries in the model became
stronger there were disproportionately large decreases in net displacements, inter-patch movements and the proportion of beetles
in the matrix. The model produced realistic patterns of population-level displacement over periods up to 13 days with fully
permeable boundaries for one dataset and strong boundaries for the other. This may be explained by the heights of the tansy
patches in each study, as beetles will be unable to cross the boundary near the top of a patch that emerges from the matrix.
The simulations demonstrate the important effects of boundary behaviour on displacement patterns and indicate temporal and
spatial variability in permeability. Realistic models of movement must therefore include behaviour at habitat boundaries.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
| |
Keywords: | Chrysomelidae Colonization Diffusion Dispersal Random walk |
本文献已被 PubMed SpringerLink 等数据库收录! |
|