ONTOGENETIC CHANGES IN RESPONSE TO HETEROSPECIFIC ALARM CUES BY JUVENILE LARGEMOUTH BASS ARE PHENOTYPICALLY PLASTIC by GRANT E. BROWN 1,2) , DEVON L. GERSHANECK 3) , DESIREE L. PLATA 3) and JUSTIN L. GOLUB 3,4) ( 1 Department of Biology, Concordia University, 1455 Boul. de Maisonneuve O., Montréal, Québec, H3G 1M8, Canada; 3 Department of Biological Sciences, Union College, Schenectady, NY, 12308, USA) (Acc. 19-IV-2002) Summary Juvenile largemouth bass ( Micropterus salmoides ) undergo an ontogenetic change in their response to chemical alarm cues of a heterospecic prey guild member ( nescale dace, Phoxinus neogaeus ), shifting from an antipredator to a foraging response at a standard length of 50 to 55 mm. We conducted a laboratory study to determine if: (1) this shift is xed or phenotypicallyplastic, and (2) juvenile bass respond to the alarm cues of a non-Ostariophysan prey guild member. Juvenile bass were reared on high versus low food diets for 10 weeks prior to the experiment, and then exposed to heterospecic skin extracts (the source of chemical alarm cues). When exposed to the skin extracts of nescale dace or green sun sh ( Lepomis cyanellus ), juvenile bass exhibited a signi cant
Behaviour – Brill
Published: Jan 1, 2002
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