Enhanced prey capture skills in Astyanax cavefish larvae are independent from eye loss

EvoDevo

Sylvie Rétaux³  William R Jeffery¹  Jonathan Bibliowicz³  Luis Espinasa² 

[1] Department of Biology, University of Maryland, College Park, MA 02543, USA;School of Science, Marist College, 3399 North Rd, Poughkeepsie, NY 12601, USA;Equipe Développement Evolution du Cerveau Antérieur, UPR3294 N&D, CNRS, Institut Alfred Fessard, 91198 Gif-sur-Yvette, France

关键词: Troglomorphy;    Cavefish;    Prey capture;    Lensectomy;    Astyanax;   

Others  :  1093298
DOI  :  10.1186/2041-9139-5-35

 received in 2014-07-01, accepted in 2014-09-01,  发布年份 2014

【 摘 要 】

Background

Enhanced food-finding efficiency is an obvious adaptive response to cave environments. Here, we have compared the food-finding abilities of Astyanax surface fish and blind cavefish young larvae in their first month of life, in the dark.

Results

Our results show that enhanced prey capture skills of cavefish are already in effect in fry soon after the yolk is depleted and the young larvae must find food for themselves. Moreover, using prey capture competition assays on surface fish fry with lensectomies, we showed that eye-dependent developmental processes are not the main determinant for enhanced prey capture skills. Finally, using F₂ hybrid larvae resulting from crosses between surface fish and cavefish, we found that reduced eyes do not confer a selective advantage for prey capture by fry in the dark.

Conclusion

We discuss these data with regards to our current developmental and genetic understanding of cavefish morphological and behavioral evolution.

【 授权许可】

   
2014 Espinasa et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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