FEEDING KINEMATICS AND PERFORMANCE OF THE ENDANGERED RIO GRANDE SILVERY MINNOW (HYBOGNATHUS AMARUS)

被引：0
|
作者：
Magana, Hugo A. [1 ]
机构：
[1] United States Dept Agr Forest Serv, North Fork John Day Ranger Dist, Ukiah, OR 97880 USA
来源：
SOUTHWESTERN NATURALIST | 2014年 / 59卷 / 01期
关键词：
PREY CAPTURE; JAW PROTRUSION; SUCTION; FISH; HATCHERY; FLOW; EXPERIENCE; TELEOSTS; SPEED; WAVE;
D O I：
10.1894/F04-RJE-35.1
中图分类号：
X176 [生物多样性保护];
学科分类号：
090705 ;
摘要：
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 degrees, while feeding angles were ca. 90 degrees. 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.
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页码：22 / 29
页数：8
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