首页|Evolutionary modifications of Astyanax larval prey capture(LPC)in a dark environment
Evolutionary modifications of Astyanax larval prey capture(LPC)in a dark environment
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Feeding strategies of an organism depend on the multimodal sensory processing that most efficiently integrates available visual,chemosensory,and/or mechanoreceptive cues as part of their environmental adaptation.The blind cavefish morph of Astyanax mexicanus has developed sensory-dependent behaviors to find food more efficiently than their eyed,surface-morph counterparts while in darkness.In the absence of light,adult cavefish have evolved enhanced behaviors,such as vibration attraction behavior(VAB),and changes in feeding angle.Here,we identified evolved differences in cavefish larval prey capture(LPC)behavior.In the dark,LPC is more efficient in cavefish than in surface fish.Furthermore,different cave populations express laterality in their LPC and strike towards prey preferentially located on their left or right sides.This suggests the occurrence,to some extent,of divergent LPC evolution among cave populations.While LPC can be triggered exclusively by a vibration stimulus in both surface and cavefish,we provide evidence that LPC is,at least partially,a multimodal sensory process different from adult VAB.We also found that a lack of food may exacerbate the laterality of LPC.Thus,we proposed a mathematical model for explaining laterality based on a balance between:(1)enlarged range of foraging field(behavioral or perceptive)due to asymmetry,(2)food abundance,and(3)disadvantages caused by laterality(unequal lateral hydrodynamic resistance when swimming,allocation of resources for the brain and receptors,and predator escape).
AstyanaxCaveTroglobiteNeuromastPreyAsymmetry
Luis Espinasa、Ruth Diamant、Ehud Vinepinsky、Monika Espinasa
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School of Science,Marist College,Poughkeepsie,NY 12601,USA
Depto.de Física,Universidad Autónoma Metropolitana-lztapalapa,Ciudad de México C.P.09310,México
Institut de Biologie de I'ENS(IBENS),Département de Biologie,École Normale Supérieure,CNRS,INSERM,Université PSL,75005 Paris,France
SUNY Ulster,Stone Ridge,NY 12484,USA
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School of Science,Marist CollegeInstitut de Biologie de I'ENS(IBENS),CNRS,FranceParis-Saclay Institute of Neuroscience,CNRSUniversity Paris-Saclay,France
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