Abstract
Relicts are species with a former, more widespread distribution range but can also include specific populations in parts of a species distribution (thus called relict populations). Such populations are often found towards the species range limits where conditions may be less optimal than in the more central parts. For peripheral relict populations to be valuable for conservation from a biodiversity point of view, they should be exposed to selection pressures that are different from the more central ones allowing for unique adaptations to arise. I will discuss data from studies of two closely related butterfly species where the aim was to evaluate the uniqueness of marginal relict populations in relation to their more central counterparts. Neutral genetic variation and values of adaptive wing traits among populations of the scarce heath (Coenonympha hero) and the pearly heath (C. arcania) from three biogeographically different regions were compared representing one central and two peripheral parts of their distributions; one peripheral connected to and one isolated from the main area of their distributions. Individuals from the isolated region were significantly differentiated from the peripheral and central regions in both neutral genetic traits and adaptive wing traits, while the peripheral and central populations showed no signs of differentiation in both trait types. I will discuss the possible mechanisms behind the observed patterns and show that the peripheral, relict populations of also widespread species can contribute with valuable and unique genetic variation. Marginal relict populations constitute ideal study objects of evolution in marginal habitats as they can be used to test how well theory and laboratory experiments reflects more complex natural systems.
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Acknowledgements
I thank all co authors and collaborators involved in various parts of the projects. Thanks to Atte Komonen, Ane Laugen and Thomas Schmitt for valuable comments on earlier versions of this manuscript. Part of the data presented here originates from work that was done at the Department of Conservation Biology and Genetics of Uppsala University, Sweden, and at the Department of Biogeography of University of Trier, Germany.
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Cassel-Lundhagen, A. (2010). Peripheral Relict Populations of Widespread Species; Evolutionary Hotspots or Just More of the Same?. In: Habel, J.C., Assmann, T. (eds) Relict Species. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-92160-8_15
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DOI: https://doi.org/10.1007/978-3-540-92160-8_15
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