Abstract
Recently, there has been increased scientific interest among evolutionary biologists in both causes and consequences of radiations. Whereas one form of radiation – adaptive radiation – has been studied extensively, another form – non-adaptive radiation – is discussed controversially and is poorly understood. In fact, the concept of non-adaptive radiation (i.e., rapid diversification of species not accompanied by adaptation into various niches and resulting in a group of allopatric taxa) is rejected by some workers.
Therefore, the present paper aims to review patterns and processes of radiation(s) in a model taxon – the stenoecious spring snail genus Bythinella – within the theoretical framework of adaptive versus non-adaptive radiations. Based on a taxon-wide phylogeny, several methods for identifying radiations are applied, including a new pragmatic approach based on the species flock concept and a temporal frame of rapid speciation. Then, the criteria of non-adaptive radiations are assessed and the driving forces discussed both in general and specifically for Bythinella spp. Based on eight identified radiations as well as ecological, morphological, and distribution data for up to 50 species, the presence of non-adaptive radiations is suggested in this taxon. Driving forces for these radiations might be genetic drift in small sub-divided populations, though natural selection may be involved as well. Moreover, it is shown that adaptive and non-adaptive radiations might not be entirely discrete in space and time. The present study underlines the need for a better understanding of the underlying mechanisms of adaptive and non-adaptive radiations and for a judicious use of these epithets.
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Acknowledgements
We sincerely thank V. Anistratenko, H. Blatterer, M. Bodon, U. Bößneck, M. Colling, Z. Erõss, A. Falniowski, Z. Fehér, P. Glöer, M. Haase, B. Hausdorf, H. J. Hirschfelder, P. Mildner (†), V. Pešić, C. Renker, D. Reum, S. K. Şahin, M. Szarowska, and Z. Yildirim for kindly providing samples of Bythinella spp. and two anonymous referees for their comments. E. Gittenberger and G. Davis are acknowledged for inspiring our work on non-adaptive radiations. This study was financially supported by DFG grants WI 1902/5-1 (T. Wilke) and BR 1967/6-1 (M. Brändle), as well as by a stipend of the Fazit-Foundation to M. Benke.
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Wilke, T., Benke, M., Brändle, M., Albrecht, C., Bichain, JM. (2010). The Neglected Side of the Coin: Non-adaptive Radiations in Spring Snails (Bythinella spp.). In: Glaubrecht, M. (eds) Evolution in Action. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12425-9_25
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