Effects of the mosquito larvicides temephos and methoprene on insect populations in experimental ponds

Citation
Ae. Pinkney et al., Effects of the mosquito larvicides temephos and methoprene on insect populations in experimental ponds, ENV TOX CH, 19(3), 2000, pp. 678-684
Citations number
29
Categorie Soggetti
Environment/Ecology
Journal title
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
ISSN journal
07307268 → ACNP
Volume
19
Issue
3
Year of publication
2000
Pages
678 - 684
Database
ISI
SICI code
0730-7268(200003)19:3<678:EOTMLT>2.0.ZU;2-C
Abstract
The nontarget effects of Abate(R) 4E (44.6% temephos) at 0.054 kg of active ingredient (a.i.) per 1 ha and of Altosid(R) Liquid Larvicide (5% methopre ne) at 0.011 kg a.i./ha were investigated in 18 experimental ponds (average area. 202 m(2); maximum depth, 0.7 m) at Patuxent Wildlife Research Center Laurel, Maryland, USA. Ponds were sprayed three times at 3-week intervals. Six ponds were sprayed with Abate, six with Altosid, and six with distille d water. Two insect-emergence traps per pond collected for 7 d and were the n harvested 1 d before each spray and 13 to 14 days afterward. A repeated m easures analysis of variance (ANOVA) revealed significant reductions in Sha nnon diversity, equitability, and numbers of individuals, species, and fami lies in the Abate ponds relative to controls. Significant reductions also o ccurred in Ephemeroptera, Odonata, Diptera, Chironomidae, and Chaoborus sp. Hester-Dendy samplers were installed before spray one and harvested 16 d a fter spray three. Based on one-way ANOVA, Shannon diversity, equitability, and number of Ephemeroptera and Chironomidae were significantly reduced in the Abate ponds. Emergence data indicate only isolated cases with significa nt reductions in the Altosid ponds relative to controls, and the Hester-Den dy data indicate no significant differences between the Altosid and control ponds.