Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Living where the food is: web location by linyphiid spiders in relation toprey availability in winter wheat
Autore:
Harwood, JD; Sunderland, KD; Symondson, WOC;
Indirizzi:
Cardiff Univ, Sch Biosci, Cardiff CF10 3TL, S Glam, Wales Cardiff Univ Cardiff S Glam Wales CF10 3TL ardiff CF10 3TL, S Glam, Wales Hort Res Int, Warwick CV35 9EF, England Hort Res Int Warwick England CV35 9EF Res Int, Warwick CV35 9EF, England
Titolo Testata:
JOURNAL OF APPLIED ECOLOGY
fascicolo: 1, volume: 38, anno: 2001,
pagine: 88 - 99
SICI:
0021-8901(200102)38:1<88:LWTFIW>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
OEDOTHORAX-FUSCUS BLACKWALL; CEREAL APHIDS; LEPTHYPHANTES TENUIS; PTEROSTICHUS-MELANARIUS; INVERTEBRATE PREDATORS; POLYPHAGOUS PREDATORS; RHOPALOSIPHUM-PADI; SPRING BARLEY; ARANEAE; FIELD;
Keywords:
aggregative responses; Collembola; generalist predators; mini-quadrats; mini-sticky traps;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
72
Recensione:
Indirizzi per estratti:
Indirizzo: Symondson, WOC Cardiff Univ, Sch Biosci, POB 915, Cardiff CF10 3TL, S Glam, Wales Cardiff Univ POB 915 Cardiff S Glam Wales CF10 3TL m, Wales
Citazione:
J.D. Harwood et al., "Living where the food is: web location by linyphiid spiders in relation toprey availability in winter wheat", J APPL ECOL, 38(1), 2001, pp. 88-99

Abstract

1. Spiders form a major component of the generalist predator fauna, potentially able to restrict pest population growth, but their populations may befood-limited under current farming regimes. This study aimed to quantify food availability to spiders in winter wheat and to determine whether spiderweb locations are positively associated with available food resources.2. Mini-sticky traps (availability rate per 24 h, including prey falling from the crop) and mini-quadrats (instantaneous density on the ground by day) were used, in combination, to monitor the availability of potential prey to web-building species of money spider (Linyphiidae) in fields of winter wheat in Warwickshire, UK, 1997-98.3. These methods were applied to web sites of individual spiders and to non-web sites located randomly up to 30 cm away from each web. A total of 18 546 invertebrates were captured using these methods.4. Overall, significantly more potential prey were available in web sites than in non-web sites (both on sticky traps and in quadrats).5. Prey availability in May and July was about a third of that in June (both on sticky traps and in quadrats) and may have been below that known to be necessary for spiders to realize their maximum population growth rate.6. The peak rate of capture of linyphiid spiders on mini-sticky traps was 0.6 trap(-1) day(-1) at web sites, and approximately half this value at non-web sites. Numbers of spiders captured by mini-sticky traps and mini-quadrats increased exponentially as the season progressed. The high capture frequency in relation to population density, and the differential between web and non-web sites, points to a dynamic and aggregated distribution of spiders in winter wheat, which is consistent with what is known about mate-searching and web site abandonment rates by the Linyphiidae.7. The combination of techniques described here is recommended for monitoring prey availability in prey-enhancement programmes and may prove useful in quantitative studies of both intra- and interspecific interactions between spiders.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 21:37:51