Failed Invasion of a Southeastern Blackwater Stream by Bluegills: Implications for Conservation of Native Communities
作者:
GaryK. Meffe,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1991)
卷期:
Volume 120,
issue 3
页码: 333-338
ISSN:0002-8487
年代: 1991
DOI:10.1577/1548-8659(1991)120<0333:FIOASB>2.3.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
I studied three sites in an undisturbed, third-order Blackwater stream in the central Savannah River drainage of South Carolina for 2 years before and 3 years after the accidental introduction of bluegillsLepomis macrochirus. Although large numbers invaded the stream, the species declined over the next 3 years and will likely disappear soon. The bluegills had no measurable effect on the numbers of species or individuals of the stream's indigenous fish fauna. Nearby in the same drainage, bluegills successfully colonized an impounded cooling reservoir and a downstream swamp, but they did not become established in the high-flow stream below the reservoir. Unsuccessful colonization of the two flowing-water systems indicates the importance of impoundments to successful colonization by many nonnative fishes. These data, together with examples from arid-zone streams of the American Southwest, illustrate that unimpeded flow in lotic habitats may protect against successful invasion by some introduced fishes, whereas stabilized flows may increase their likelihood of establishment.
点击下载:
PDF (434KB)
返 回