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Effects of an organophosphorous insecticide on survival, fecundity, and development of Hylyphantes graminicola (Sundevall) (Araneae: Linyphiidae)
Author(s) -
Deng Lingling,
Dai Jiayin,
Cao Hong,
Xu Muqi
Publication year - 2006
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/06-194r.1
Subject(s) - linyphiidae , fecundity , biology , hatching , spider , offspring , toxicology , methamidophos , zoology , ecology , pesticide , population , pregnancy , genetics , demography , sociology
The effects of an organophosphorous insecticide, methamidophos, on fecundity and development of the spider Hylyphantes graminicola (Sundevall) (Araneae: Linyphiidae) were assessed under laboratory conditions. Susceptibility of adults of both sexes to the insecticide and its influence on fecundity of females and development of offspring were investigated. At 48 h after topical application in adults, the median lethal dose (LD50) and 10% lethal dose (LD10) were 0.35 and 0.12 μg/spider, respectively, for males and 0.52 and 0.16 μg/spider, respectively, for females. Methamidophos had detrimental effects on fecundity of females; number of eggs per clutch, total egg mass, and clutch size decreased significantly. The hatching rate of eggs from LD10‐treated females was slightly higher than the rate in the controls, but the hatching rate of eggs from LD50‐treated females was lower than the rate in the controls. However, no significant differences were observed in hatching time and development time across treatments. Development time of spiderlings from LD50‐treated females was significantly longer than the time in the controls, and body sizes of the first spiderlings from insecticide‐treated females were larger than those in the controls. However, matured offspring were smaller than those in the controls. It was concluded that methamidophos has long‐term effects on H. graminicola, and that this may affect the development of spider populations in the field.