| effects of combining an intraguild predator with a cannibalistic intermediate predator on a species-level trophic cascade. | a greater diversity of natural enemies can in some cases disrupt prey suppression, particularly when natural enemies engage in intraguild predation, where natural enemies compete with and prey upon each other. however, empirical studies have often demonstrated enhanced prey suppression despite intraguild predation. a recent theoretical study proposed the hypothesis that, when the intermediate predator is cannibalistic, intraguild predation can reduce cannibalism within the intermediate predator ... | 2011 | 21618913 |
| predation of the newly invasive pest megacopta cribraria (hemiptera: plataspidae) in soybean habitats adjacent to cotton by a complex of predators. | the kudzu bug, megacopta cribraria (f.) (hemiptera: plataspidae),is a newly invasive exotic insect found primarily on kudzu, but also on soybean, in the southeastern united states. we used molecular gut-content analysis to document predation on this pest by insects and spiders in soybean, and to detect remains of crop-specific alternative prey in predators' guts as markers of predator migration between soybean and adjacent cotton. m. cribraria was found exclusively on soybean. eight native gener ... | 2014 | 25026652 |
| predation on adult aphytis parasitoids in the field. | we report on predation on adult females of the parasitoids aphytis aonidiae and a. vandenboschi (hymenoptera: aphelinidae) foraging in the field. during 89.6 h of observation, we witnessed 18 encounters with predators, 6 of which resulted in parasitoid capture. three classes of generalist predators attacked aphytis: spiders (unidentified salticidae and thomisidae), workers of the argentine ant, linepithema humile, and nymphs of the assassin bug zelus renardii (hemiptera: reduviidae). although ob ... | 1997 | 28307223 |
| conservation of predatory arthropods in cotton: role of action thresholds for bemisia tabaci (homoptera: aleyrodidae). | studies were conducted in 1994 and 1995 to examine the effects of a range of action thresholds for managing bemisia tabaci (gennadius) biotype b (= b. argentifolii bellows & perring) with insecticides in cotton on populations of arthropod predators in imperial valley, ca, and maricopa, az. application of insecticides significantly reduced population densities of spiders, geocoris punctipes (say), g. pallens (stål), orius tristicolor (white), nabis alternatus parshley, zelus renardii kolenati, hi ... | 2002 | 12216807 |
| influence of intraguild predation among generalist insect predators on the suppression of an herbivore population. | we evaluated the influence of intraguild predation among generalist insect predators on the suppression of an herbivore, the aphid aphis gossypii, to test the appropriateness of the simple three trophic level model proposed by hairston, smith, and slobodkin (1960). we manipulated components of the predator community, including three hemipteran predators and larvae of the predatory green lacewing chrysoperla carnea, in field enclosure/exclosure experiments to address four questions: (1) do genera ... | 1993 | 28313662 |