Trophic promiscuity, intraguild predation and the problem of omnivores

Hunter, Mark D.

doi:10.1111/j.1461-9563.2008.00427.x

Cited by 35 publications

(22 citation statements)

References 69 publications

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“…Omnivores such as Pterostichus melanarius have previously been shown to be associated with cropped habitats , and they may therefore benefit from an increase in habitat area. This change in community composition of phytophages, carnivores and omnivores along the landscape complexity gradient may affect the biological control potential of these natural enemies on arable pests (Hunter 2009). …”

Section: Discussionmentioning

confidence: 99%

Species’ traits influence ground beetle responses to farm and landscape level agricultural intensification in Europe

et al. 2014

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Agricultural intensification may result in important shifts in insect community composition and function, but this remains poorly explored. Studying how groups of species with shared traits respond to local and landscape scale land-use management can reveal mechanisms behind such observed impacts. We tested if ground beetles (Coleoptera: Carabidae) divided into trait groups based on body sizes, wing morphologies and dietary preferences respond differently to farming practise (organic and conventional), farming intensity (measured as yield) and landscape complexity (measured as the proportion of arable land within a 1,000 m radius) across Europe. We used data from 143 farms in five regions in northern and central Europe. Organic farms did not differ in abundance or richness of any trait group compared to conventional farms. As farm scale intensity (yield) increased, overall abundance of beetles decreased, but abundances of small and medium sized beetles, as well as that of wingless beetles, were unaffected. Overall species richness was not affected by yield, whereas consideration of traits revealed that phytophagous and omnivorous beetles were less species rich on farms with high yields. Increasing the proportion of arable land in the landscape increased overall beetle abundance. This was driven by an increase in omnivorous beetles. The total species richness was not affected by an increase in the proportion arable land, although the richness of wingless beetles was found to increase. Potential effects on ecosystem functioning need to be taken into account when designing schemes to maintain agricultural biodiversity, because species with different ecological traits respond differently to local management and landscape changes.Electronic supplementary material The online version of this article (

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Section: Discussionmentioning

confidence: 99%

Species’ traits influence ground beetle responses to farm and landscape level agricultural intensification in Europe

et al. 2014

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“…Although both omnivorous and carnivorous invertebrates can be effective in pest control (Hunter, 2009) and are encompassed by the term "predatory Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Responses of predatory invertebrates to seeding density and plant species richness in experimental tallgrass prairie restorations

Nemec

Allen

Danielson

et al. 2014

Agriculture, Ecosystems & Environment

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a b s t r a c tIn recent decades, agricultural producers and non-governmental organizations have restored thousands of hectares of former cropland in the central United States with native grasses and forbs. However, the ability of these grassland restorations to attract predatory invertebrates has not been well documented, even though predators provide an important ecosystem service to agricultural producers by naturally regulating herbivores. This study assessed the effects of plant richness and seeding density on the richness and abundance of surface-dwelling (ants, ground beetles, and spiders) and aboveground (ladybird beetles) predatory invertebrates. In the spring of 2006, twenty-four 55 m × 55 m-plots were planted to six replicates in each of four treatments: high richness (97 species typically planted by The Nature Conservancy), at low and high seeding densities, and low richness (15 species representing a typical Natural Resources Conservation Service Conservation Reserve Program mix, CP25), at low and high seeding densities. Ants, ground beetles, and spiders were sampled using pitfall traps and ladybird beetles were sampled using sweep netting in [2007][2008][2009]. The abundance of ants, ground beetles, and spiders showed no response to seed mix richness or seeding density but there was a significant positive effect of richness on ladybird beetle abundance. Seeding density had a significant positive effect on ground beetle and spider species richness and Shannon-Weaver diversity. These results may be related to differences in the plant species composition and relative amount of grass basal cover among the treatments rather than richness.Published by Elsevier B.V.

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“…Complex interactions found in the ecological systems that include omnivores interfere on the dynamics, resources utilization, and demography of several other populations within a community. In agricultural systems, the presence of omnivores may have positive (e.g., enhance predator pool diversity) or negative consequences (e.g., omnivorous insect chooses feeding on the plant material) (Hunter 2009). Thus, planning integrated pest management programs can become more complex in the ecological systems that include omnivorous.…”

Section: Introductionmentioning

confidence: 99%

Maize-Dwelling insects omnivory in Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) egg masses

Menezes-Netto

Varella

2012

Braz. arch. biol. technol.

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Trophic promiscuity, intraguild predation and the problem of omnivores

Cited by 35 publications

References 69 publications

Species’ traits influence ground beetle responses to farm and landscape level agricultural intensification in Europe

Species’ traits influence ground beetle responses to farm and landscape level agricultural intensification in Europe

Responses of predatory invertebrates to seeding density and plant species richness in experimental tallgrass prairie restorations

Maize-Dwelling insects omnivory in Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) egg masses

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