Aquatic Sciences Meeting, Albuquerque 2001

PC07 Spatial and Temporal Connections

Date: Wednesday, February 14, 2001

Location: Southwest Hall

Davis, K, C, University of San Diego, San Diego, USA, kirstend@acusd.edu

Ripley, B, J, University of San Diego, San Diego, USA, bripley@alum.mit.edu

Simovich, M, A, University of San Diego, San Diego, USA, simo@acusd.edu

ACUTE TOXICITY OF MALATHION TO THE SAN DIEGO FAIRY SHRIMP BRANCHINECTA SANDIEGONENSIS.

Branchinecta sandiegonensis is an endangered fairy shrimp (Anostraca) that lives in Southern California vernal pools. Malathion and other pesticides are commonly sprayed in San Diego and may contaminate pools. There is little documented information on toxicity levels of certain pesticides such as malathion to fairy shrimp. In order to assess the risk due to toxic effects of malathion, we determined the LD50 of malathion for B. sandiegonensis in 24 hour toxicity assays using standard EPA protocols. This test was done using juvenile shrimp between 24-48 hours old, the earliest they can be detected. We also determined the LD50 of malathion for Ceriodaphnia dubia at the same age, a commonly used assay organism which co-occurs in pools with B. sandiegonensis. This toxicity information will be helpful in developing conservation plans for vernal pools.

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Aquatic Sciences Meeting, Albuquerque 2001

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