Effects of mosquito larvicide on mallard ducklings and prey

Wildlife Society Bulletin
By: , and 


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We determined the effects of a commonly used mosquito (Culicidae) larvicide (California Golden Bear Oil??, also GB-1111) on body mass and survival of mallard (Anas platyrhynchos) ducklings and on target and nontarget invertebrates. Field studies conducted on natural ponds located in salt marshes in south San Francisco Bay indicated that GB-1111 had an initial impact on potential invertebrate prey of birds that dissipated rapidly 3 days post-spray. Over-spray, spray drift, or treatment of more extensive areas would likely delay recovery of nontarget prey. Ducklings held intermittently on the ponds over an 8-day period showed no significant effects of weight loss due to invertebrate prey depletion, although initial effects of exposure to GB-1111 were observed (i.e., matting of feathers and mild hypothermia). These results emphasize the importance of avoiding application of GB-1111 during cold temperatures and adherence to recommended use of this larvicide. Otherwise, GB-1111 had a short-term impact on wetland communities.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Effects of mosquito larvicide on mallard ducklings and prey
Series title Wildlife Society Bulletin
Volume 30
Issue 3
Year Published 2002
Language English
Contributing office(s) Pacific Regional Director's Office, San Francisco Bay-Delta
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Wildlife Society Bulletin
First page 675
Last page 682
Online Only (Y/N) N
Additional Online Files (Y/N) N