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Titolo:
Artificial selection for aphid tolerance in the polyphagous predator Lepthyphantes tenuis
Autore:
Beck, JB; Toft, S;
Indirizzi:
Univ Aarhus, Inst Biol Sci, Dept Zool, DK-8000 Aarhus C, Denmark Univ Aarhus Aarhus Denmark C l Sci, Dept Zool, DK-8000 Aarhus C, Denmark
Titolo Testata:
JOURNAL OF APPLIED ECOLOGY
fascicolo: 4, volume: 37, anno: 2000,
pagine: 547 - 556
SICI:
0021-8901(200008)37:4<547:ASFATI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
RHOPALOSIPHUM-PADI HOM; ARTHROPOD PREDATORS; CEREAL APHIDS; GENETIC-VARIATION; FOOD LIMITATION; SPRING BARLEY; POPULATIONS; SPIDERS; LINYPHIIDAE; DENSITY;
Keywords:
diet quality; heredity; natural control; natural stress factor; prey defence;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Toft, S Univ Aarhus, Inst Biol Sci, Dept Zool, Bldg 135, DK-8000 Aarhus C,Denmark Univ Aarhus Bldg 135 Aarhus Denmark C , DK-8000 Aarhus C, Denmark
Citazione:
J.B. Beck e S. Toft, "Artificial selection for aphid tolerance in the polyphagous predator Lepthyphantes tenuis", J APPL ECOL, 37(4), 2000, pp. 547-556

Abstract

1. Insight into the capacity of natural enemies to control pests may lead to wiser pest management, including a reduction in the use of pesticides. The presence of polyphagous predators may contribute to the control of aphidpopulations and thereby prevent outbreaks. Many arthropod generalist predators have a limited tolerance to the consumption of aphids. However, differences exist between and within species in the ability to cope with an aphiddiet; some within-species variation could be due to genetic differences between individuals.2. In order to demonstrate additive genetic variation in aphid tolerance, a breeding programme was carried out where offspring of field-collected females of the linyphiid spider Lepthyphantes tenuis were selected for survival on a pure diet of the aphid Rhopalosiphum padi through the first juvenileinstar. Aphid tolerance was estimated as the survival in proportion to survival of a control line, fed mixed collembola. Development and reproductionwere recorded in order to detect possible selection effects.3. After only one generation of selection, survival to the first moult on an aphid diet was significantly improved. The aphid tolerance of the first instar spiderlings increased by 63% and a high heritability for the trait was found. An F-2 control group derived from selected parents had significantly reduced survival compared with an F-2 control group derived from control parents.4. Developmental rate and reproduction were lower in the selected group than in the control line, demonstrating a cost of tolerance to aphids.5. The background of the genetic variation and its possible implications for the natural limitation of aphid populations in agricultural systems is discussed. Consideration of the control potential of polyphagous predators must include their genetic variation in aphid tolerance. Management practices aimed at augmenting specialist aphid predators, e.g. by erecting banks orcover crops containing non-pest aphids, may provide selection pressure forincreased aphid tolerance in polyphagous predators.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 11:50:09