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Titolo:
ECOLOGICAL RESTRUCTURING IN EXPERIMENTAL AQUATIC MESOCOSMS DUE TO THEAPPLICATION OF DIFLUBENZURON
Autore:
BOYLE TP; FAIRCHILD JF; ROBINSONWILSON EF; HAVERLAND PS; LEBO JA;
Indirizzi:
NATL BIOL SERV,MIDWEST SCI CTR,4200 NEW HAVEN RD COLUMBIA MO 65201 NATL BIOL SERV,MIDWEST SCI CTR COLUMBIA MO 65201 COLORADO STATE UNIV,NATL BIOL SERV,MIDCONTINENT ECOL SCI CTR,AYLESWORTH NW FT COLLINS CO 80523 US FISH & WILDLIFE SERV ANCHORAGE AK 99519
Titolo Testata:
Environmental toxicology and chemistry
fascicolo: 10, volume: 15, anno: 1996,
pagine: 1806 - 1814
SICI:
0730-7268(1996)15:10<1806:ERIEAM>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROPHIC CASCADES; COMMUNITY-LEVEL; INSECTICIDE; FISH; LAKE; PERSISTENCE; RESPONSES; TOXICITY; BLUEGILL; PONDS;
Keywords:
DIFLUBENZURON; AQUATIC; INDIRECT EFFECTS; ECOLOGICAL RESTRUCTURING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
T.P. Boyle et al., "ECOLOGICAL RESTRUCTURING IN EXPERIMENTAL AQUATIC MESOCOSMS DUE TO THEAPPLICATION OF DIFLUBENZURON", Environmental toxicology and chemistry, 15(10), 1996, pp. 1806-1814

Abstract

Diflubenzuron is a chitin-inhibiting insecticide that is registered for use in controlling a multitude of invertebrate pests. The selectivemode of action of diflubenzuron provided us with a unique tool for examining the indirect responses of an experimental aquatic ecosystem following direct impacts at the primary consumer (invertebrate) trophic level. Twelve outdoor aquatic mesocosms (0.1 ha each) were randomly assigned to three treatments of diflubenzuron (four mesocosms/treatment): control, monthly (five total 10-mu g/L applications), or biweekly (twice monthly; nine total 10-mu g/L applications). Direct impacts on invertebrates (numbers and species composition of insects and zooplankton) and indirect impacts on fish (mortality, growth, and reproduction of bluegill sunfish and largemouth bass), phytoplankton (biomass and productivity), and water quality were measured over 16 weeks posttreatment. Both monthly and biweekly treatments of diflubenzuron decreased total numbers (fivefold reduction) and species richness (twofold reduction) and increased dominance (twofold increase) of zooplankton within 4weeks posttreatment; Cladocerans, Copepods, and Rotifers were all sensitive. Diflubenzuron reduced species richness of emergent insects, which resulted in increased dominance by a few species; however, impactson emergent insects were confounded by a treatment x time interaction. Direct reductions in invertebrate grazers caused indirect increases in algal biomass. Indirect effects on biomass (50% reduction) and individual weight (50% reduction) of juvenile bluegill occurred because ofapparent decreases in invertebrate food resources. No statistically significant impacts were observed on adult bluegill or largemouth bass for the duration of the experiment. Results indicated that di8ubenzuron had both direct and indirect impacts on the experimental aquatic ecosystems under the conditions tested.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 09:41:11