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Master Thesis

Spatiotemporal dynamics and IDE framework for the fritillary butterflies

Abstract : Appreciating how populations persist, through the ecological processes of limitation, regulation and population growth, is paramount for efficient and successful conservation strategies. Here, we investigated the spatial and temporal dynamics of a group of closely related butterflies (Argynnis adippe, A. aglaja, A. paphia, Boloria euphrosyne and B. selene) to understand the density-dependence processes affecting these butterflies at different scales and the contribution of dispersal on the spatiotemporal butterfly patch dynamics. Indices of annual abundances were used to fit various density-dependent models at different scales (UK and 100x100km). Our analysis showed a major heterogeneity of density-dependent processes at the smaller scale, highlighting the diversity of dynamics across the UK and between species. We defined numerous circular patches (with a radius of either 2km or 5km) and worked with two previously-used approximations to estimate dispersal. Finally, we combined our results into an Integrodifference Equation (IDE) and explored deterministic dynamics for our different patch sizes, dispersal models, and with constant immigration into patches. Our results suggested a bigger contribution of population growth, instead of dispersal, on the outcomes of the spatiotemporal dynamics of this group of butterflies. As such, it would be better to improve the quality of small patches than to extend their limits. Our results also emphasized the consequences of the rescue effect and the importance of a metapopulation structure for butterfly persistence.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-01630997
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Submitted on : Wednesday, November 8, 2017 - 3:21:49 PM
Last modification on : Monday, July 6, 2020 - 3:38:22 PM
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  • HAL Id : dumas-01630997, version 1

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Corentin Lemesle. Spatiotemporal dynamics and IDE framework for the fritillary butterflies. Ecology, environment. 2017. ⟨dumas-01630997⟩

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