Abstract
Cave animals are widely recognised as model organisms to study regressive evolutionary processes like the reduction of eyes. In this paper, we report on the regressive evolution of species discrimination in the cave molly, Poecilia mexicana, which, unlike other cave fishes, still has functional eyes. This allowed us to examine the response to both visual and non-visual cues involved in species discrimination. When surface-dwelling females were given a chance to associate with either a conspecific or a swordtail (Xiphophorus hellerii) female, they strongly preferred the conspecific female both when multiple cues and when solely visual cues were available to the female. No association preference was observed when only non-visual cues were provided. In contrast, cave-dwelling females showed no preference under all testing conditions, suggesting that species recognition mechanisms have been reduced. We discuss the role of species discrimination in relation to habitat differences.
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Acknowledgements
We thank Jakob Parzefall for helpful discussions and for stimulating our research. We also thank the Mexican Government for issuing permits to collect fish (Permiso de pesca de fomento numbers: 291002-613-1577 and DGOPA/5864/260704/-2408). Deborah McLennan and an anonymous reviewer provided extremely helpful comments on the manuscript. The fish team of the aquarium at the University of Hamburg provided animal care. Financial support came from DFG (PL 470/1-1; SCHL 344/10-2).
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Riesch, R., Schlupp, I., Tobler, M. et al. Reduction of the association preference for conspecifics in cave-dwelling Atlantic mollies, Poecilia mexicana . Behav Ecol Sociobiol 60, 794–802 (2006). https://doi.org/10.1007/s00265-006-0223-z
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DOI: https://doi.org/10.1007/s00265-006-0223-z