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1 March 2014 Feeding kinematics and performance of the endangered Rio Grande silvery minnow (Hybognathus amarus)
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Abstract
To elucidate feeding kinematics of the endangered Rio Grande silvery minnow (Hybognathus amarus), high-speed (500 frames/s) recordings of dorsal, lateral, and ventral feeding of larval silvery minnow were analyzed through National Institute of Health ImageJ software. Suction-feeding with buccal expansion was observed when feeding was apparent, and approach and feeding angle of H. amarus approaching the feeding substrate were calculated. Angles of approach averaged ca. 24–90°, while feeding angles were ca. 90°. Duration and touches, duration and bites, and touches and bites were correlated at 0.74, 0.62, and 0.54, respectively. Video analysis of feeding kinematics showed that H. amarus uses a combination of biting into the substrate followed by rapid lateral movement of the head. Hybognathus amarus has evolved a rapid-feeding mechanism in a turbid environment that allows for tasting and feeding sequences averaging 50–80 milliseconds.
and Hugo A. Magaña "Feeding kinematics and performance of the endangered Rio Grande silvery minnow (Hybognathus amarus)," The Southwestern Naturalist 59(1), (1 March 2014). https://doi.org/10.1894/F04-RJE-35.1
Received: 5 August 2012; Accepted: 1 February 2013; Published: 1 March 2014
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