Feeding kinematics and performance of the endangered Rio Grande silvery minnow (Hybognathus amarus)

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 expa...

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Bibliographic Details
Published in:The Southwestern naturalist 2014-03, Vol.59 (1), p.22-29
Main Author: Magana, Hugo A
Format: Article
Language:English
Subjects:
Algae
Animal locomotion
Behavior
Feature s
Fish
Food
Food and nutrition
Hybognathus amarus
Kinematics
Minnows
Mouth
Plankton
Rivers
Zoological research
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Summary: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.
ISSN:0038-4909
1943-6262
DOI:10.1894/F04-RJE-35.1