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Titolo:
EFFECTS OF AIR-POLLUTION ON THE SEARCHING BEHAVIOR OF AN INSECT PARASITOID
Autore:
GATE IM; MCNEILL S; ASHMORE MR;
Indirizzi:
UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,SILWOOD PK ASCOT SL5 7PY BERKS ENGLAND
Titolo Testata:
Water, air and soil pollution
fascicolo: 3, volume: 85, anno: 1995,
pagine: 1425 - 1430
SICI:
0049-6979(1995)85:3<1425:EOAOTS>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
POPULATION; SO2;
Keywords:
INSECTS; PARASITOID; OZONE; NITROGEN DIOXIDE; SULFUR DIOXIDE; SEARCHING BEHAVIOR; NATURAL ENEMY CONTROL; ASOBARA TABIDA; DROSOPHILA SUBOBSCURA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
I.M. Gate et al., "EFFECTS OF AIR-POLLUTION ON THE SEARCHING BEHAVIOR OF AN INSECT PARASITOID", Water, air and soil pollution, 85(3), 1995, pp. 1425-1430

Abstract

To assess the impact of air pollutants on the population dynamics of herbivores, the effects of pollutants an their natural enemies including predators, parasites, and pathogens must be evaluated in addition to direct effects and indirect effects mediated via the host plant. insect parasitoids are an important group of such natural enemies providing many examples of partial or complete biological control of pest species. This study examined the effects of air pollutants (ozone (O-3), sulphur dioxide (SO2), and nitrogen dioxide (NO2)) on the searching behaviour of insect parasitoids. A series of experiments comprising short-term, closed chamber fumigations of O-3, SO2, and NO2 (100 nl 1(-1))of the braconid parasitoid (Asobara tabida) and aggregated distributions of its host larvae (Drosophila subobscura) was set up. Analysis ofchamber results showed that the proportion of hosts parasitised and the searching efficiency of the parasitoids were both significantly reduced with O-3 fumigation, but not with NO2 or SO2 fumigations. O-3 fumigation reduced percentage parasitism by approximately 10%. Parasitoids were able to avoid patches with no hosts, both in filtered air controls and when exposed to pollutants. However in the O-3 and NO2 treatments they appeared less able to discriminate between different host densities, suggesting that pollutants may interfere with the olfactory responses of the parasitoids. These results indicate the potential for air pollutants, particularly O-3, to negatively influence the searchingbehaviour of parasitoids, and hence reduce the efficiency of natural enemy control of many pest species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 21:50:58