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title Agricultural policy-induced landscape changes: effects on carabid abundance and their biocontrol potential
authors Ameixa, O; Kindlmann, P
author full name Ameixa, Olga; Kindlmann, Pavel
title Agricultural policy-induced landscape changes: effects on carabid abundance and their biocontrol potential
nationality nacional
language English
document type Article
author keywords agricultural intensification; biocontrol; density; diversity; species richness; food webs; predatory pressure
abstract One of the most important services provided by biodiversity is thought to be the biological control of pests in agricultural landscapes, including aphids on cereals. The food webs potentially contributing to biological control of aphids primarily consist of polyphagous predators, parasitoids and pathogens. The problems of aphid pests have increased greatly since the 1970-ies, possibly as an effect of agricultural intensification, which is thought to have reduced diversity and abundance of these predators and parasites and consequently their biocontrol potential. The main objective Of this Study was to test this by measuring this potential for biological control of aphids, and relate it to agricultural intensification and predator abundance. We selected 30 farms distributed along agricultural intensification gradients, based on the amount of fertilizers applied per hectare. Estimates of ground-living predator density were obtained using pitfall trapping over a one-week period. Traps were placed inside the cereal fields, 10 in from the margin, in 2 replicates per field. Predation risk due to ground-living predators (biocontrol potential) was estimated by monitoring removal of aphids glued to labels. This was done in the same fields, in the immediate vicinity of the traps, over a period of 2 days. The proportion of aphids eaten per unit time was the response variable. We present the correlations between intensity of agricultural exploitation, predator abundance and biocontrol potential. The outcomes are not straightforward in that intensification begets a reduction in predator density and biocontrol potential. We discuss the potential confounding issues that might have affected Our results.
author address [Ameixa, Olga] Inst Syst Biol & Ecol AS CR, Dept Theoret Ecol, CZ-37005 Ceske Budejovice, Czech Republic; Univ S Bohemia, CZ-37005 Ceske Budejovice, Czech Republic
reprint address Ameixa, O (reprint author), Inst Syst Biol & Ecol AS CR, Dept Theoret Ecol, Branisovska 3, CZ-37005 Ceske Budejovice, Czech Republic.
e-mail address olgameixa@portugalmail.pt
researcherid number Ameixa, Olga/E-2297-2011; Kindlmann, Pavel/H-7718-2014
orcid number Ameixa, Olga/0000-0002-5422-1090;
funding agency and grant number GA CR [DIV/06/E013]; GA AV CR [A6087301]
funding text This research was supported by the grant No. DIV/06/E013 of the GA CR, grant No. LC06073 of the MSMT and by the grant No. A6087301 of the GA AV CR.
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cited reference count 61
times cited 6
total times cited count (wos, bci, and cscd) 6
publisher city CESKE BUDEJOVICE
issn 1210-5759
29-character source abbreviation EUR J ENTOMOL
iso source abbreviation Eur. J. Entomol.
year published 2008
volume 105
issue 3
beginning page 467
ending page 476
page count 10
web of science category Entomology
subject category Entomology
document delivery number 338ZC
unique article identifier WOS:000258546900014
CESAM authors