SOME EFFECTS OF ACIDIFIED WATER ON THE EARLY DEVELOPMENT OF ROACH (Rutilus rutilus L.) AND PERCH (Perca fluviatilis L.)1
作者:
Niklas Johansson,
Göran Milbrink,
期刊:
JAWRA Journal of the American Water Resources Association
(WILEY Available online 1976)
卷期:
Volume 12,
issue 1
页码: 39-48
ISSN:1093-474X
年代: 1976
DOI:10.1111/j.1752-1688.1976.tb02637.x
出版商: Blackwell Publishing Ltd
关键词: perch;roach;pH values;roe;hatching.
数据来源: WILEY
摘要:
ABSTRACT.Fertilized eggs of perch (Perca fluviatilus L.) and roach (Rutilus rutilus L.) were reared at different pH values both in the field and in the laboratory. The results from the laboratory tests revealed that both species showed at least a 50% decrease in their hatching frequencies when reared at pH values below 5.6. At pH values below 4.6 both species studied show an almost complete lack of reproduction. The field studies with eggs from different lakes indicated that there might be an adaptation, manifesting itself as a higher frequency of hatching in water with a composition similar to that of the natural habitat. Field experiments also showed that the roach is more sensitive than perch to low pH values.
点击下载:
PDF
(415KB)
返 回