Environmental effects of mosquito insecticides on saltmarsh invertebrate fauna

Russell, Tanya L., Kay, Brian H., and Skilleter, Greg A. (2009) Environmental effects of mosquito insecticides on saltmarsh invertebrate fauna. Aquatic Biology, 6. pp. 77-90.

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Abstract

Despite the fact that Bacillus thuringiensis var. israelensis de Barjac (Bti) and s-methoprene are considered to be among the most target-specific of insecticides, there are some indications that non-target organisms may be impacted in different ecosystems. We examined the effects of Bti and s-methoprene on non-target aquatic and terrestrial fauna in 2 subtropical saltmarshes approximately 30 km apart. The main taxa collected from ephemeral pools were copepods and from terrestrial plots were springtails (Collembola), mites (Acariformes) and ants (Hymenoptera), with smaller numbers of beetles (Coleoptera), true bugs (Heteroptera) and flies (Diptera). Following applications of both products, inconsistent short-term (<20 d) differences in the composition of the arthropod community were noted. After applications of Bti to ephemeral pools, smaller numbers of copepods were recorded but at only one locality. There were no significant effects of s-methoprene on the arthropods in ephemeral pools at either locality. The numbers of mites increased in terrestrial plots after applications of s-methoprene at both localities and Bti at one locality, but these effects were short-lived and varied depending on which specific habitat was sampled (i.e. vegetation or sediment surface). There were few significant effects on any other taxa and these effects were also localised and short-lived. These results suggest that applications of Bti and s-methoprene do not impact the abundance and composition of non-target arthropod assemblages in subtropical saltmarshes, although more work on potential sub-lethal effects of the insecticides is needed.

Item ID: 34887
Item Type: Article (Research - C1)
ISSN: 1864-7790
Keywords: Bacillus thuringiensis var. israelensis, bti, s-methoprene, mosquito control, saltmarsh, ecological impacts, Australia, Copepoda, Acariformes
Date Deposited: 02 Sep 2014 04:52
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 50%
06 BIOLOGICAL SCIENCES > 0608 Zoology > 060808 Invertebrate Biology @ 50%
SEO Codes: 96 ENVIRONMENT > 9604 Control of Pests, Diseases and Exotic Species > 960405 Control of Pests, Diseases and Exotic Species at Regional or Larger Scales @ 50%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments @ 50%
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