Preference of Redear Sunfish on Zebra Mussels and Rams-Horn Snails
作者:
JohnR. P. French,
MichaelN. Morgan,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 1995)
卷期:
Volume 10,
issue 1
页码: 49-55
ISSN:0270-5060
年代: 1995
DOI:10.1080/02705060.1995.9663416
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We tested prey preferences of adult (200- to 222-mm long) redear sunfish (Lepomis microlophus) on two size classes of zebra mussels (Dreissena polymorpha) and two-ridge rams-horns (Helisoma anceps) in experimental aquaria. We also tested physical limitations on consuming these mollusks and determined prey bioenergetic profitability. Redear sunfish strongly preferred rams-horns over zebra mussels, but they displayed no size preference for either prey. Ingestion was not physically limited since both prey species up to 15-mm long fit within the pharyngeal gapes of redear sunfish. Rams-horns were more bioenergetically profitable than zebra mussels and ingestion of rams-horn shell fragments was about three times less than zebra mussels. Rams-horns were somewhat more resistant to shell-crushing, but all size ranges of both prey species tested were crushable by redear sunfish. These studies suggested that the redear sunfish should not be considered a panacea for biological control of zebra mussels.
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