Alley cropping agroforestry mediates carabid beetle distribution at a micro-habitat scale

Richard, Romain; Cahon, Thomas; Llandres, Ana L.; Levier, Lisa Le; Proudhom, Grégoire; Casas, Jérôme

doi:10.1007/s10457-019-00390-8

Cited by 3 publications

(2 citation statements)

References 52 publications

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“…In alley cropping systems, UVS seem to act as a sink (i.e. unfavorable habitat) or a barrier hampering their movements, as their activity-density was even lower in UVS than in crop alleys, which is in line with the results of Richard et al (2019). Moreover, Boinot et al (2019b) showed that small and carnivorous carabids spent the winter in crop alleys, whereas larger carabids were found mostly in UVS.…”

Section: Negative Effects Of Alley Cropping Agroforestry On Generalissupporting

confidence: 76%

Promoting generalist predators of crop pests in alley cropping agroforestry fields: Farming system matters

Boinot

Mézière

Poulmarc’h

et al. 2020

Ecological Engineering

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Developing agroecological practices that enhance biological control of crop pests is a major issue for the transition of agriculture towards sustainable and biodiversityfriendly systems. Agroecological infrastructures (AEI) are devoted to the support of ecosystem service providers, although they have mixed effects on natural enemies of crop pests. In temperate regions, alley cropping agroforestry involves within-field AEI, in the form of tree rows and associated understory vegetation strips. The objective of this study was to assess the potential of generalist predators (carabid beetles and cursorial spiders) to control weed seeds and invertebrate pests in alley cropping vs pure crop systems, under two contrasting farming systems (conventional vs organic). Predator surveys were carried out in May and June 2017 in SouthWestern France over 12 winter cereal fields. Our study revealed that the effect of alley cropping was modulated by the farming system. Under conventional farming, alley cropping had a negative effect on the activity-density and species richness of generalist predators, especially regarding carnivorous carabids whose activity-density was reduced by nearly 50%. Under organic farming, alley cropping enhanced both the activity-density and complementarity of generalist predators, with a twofold increase in the activity-density of seed-feeding carabids (predominantly granivorous and omnivorous), potentially promoting weed seed and invertebrate pest control. Our results suggest that the effectiveness of AEI in promoting natural enemies depends on the farming system at the field scale, which affects resource availability and determines spillover intensity between habitats. AEI are often perceived as sources of natural enemies. However, sink and retention effects (i.e. reduced or delayed spillover into crop fields due to higher 3 attractiveness of AEI) are overlooked and very likely to explain the mixed impacts of AEI on natural enemy communities.

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Section: Negative Effects Of Alley Cropping Agroforestry On Generalissupporting

confidence: 76%

Promoting generalist predators of crop pests in alley cropping agroforestry fields: Farming system matters

Boinot

Mézière

Poulmarc’h

et al. 2020

Ecological Engineering

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“…Nevertheless, limited understanding of the interrelated effects of agroforestry microhabitats on diversity patterns reduces our ability to project how a possible expansion of agroforestry will impact biodiversity and ecosystem services (Boinot et al, 2019;Santos P.Z.F. et al, 2019;Richard et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Why Do Agroforestry Systems Enhance Biodiversity? Evidence From Habitat Amount Hypothesis Predictions

et al. 2022

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Considering the present ecological crisis, land use-biodiversity relationships have become a major topic in landscape planning, ecosystem management and ecological restoration. In this scope, consistent patterns of outstanding biodiversity have been identified in agroforestry systems within diverse biogeographic regions and types of management. Empirical work has revealed that agroforestry higher structural complexity, when compared with current simplified agricultural systems, might be partially responsible for the observed patterns. The recently developed Habitat Amount Hypothesis predicts diversity for a local habitat patch, from the amount of the same habitat within the local landscape. We have expanded the previous hypothesis to the landscape level, computing the influence of the dominant land uses on the diversity of coexisting guilds. As a case study, we have considered archetypal landscapes dominated (or co-dominated) by crops or trees, which were compared using normalized diversities. The results obtained show that agroforestry systems substantially increase functional diversity and overall biodiversity within landscapes. We highlight that the normalized values should be parametrized to real conditions where the type of crop, tree and agroecological management will make a difference. Most importantly, our findings provide additional evidence that agroforestry has a critical role in enhancing biodiversity in agricultural landscapes and, in this way, should be regarded as a priority measure in European Agri-environmental funding schemes.

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Biodiversity in temperate silvoarable systems: A systematic review

Kletty¹,

Rozan²,

Habold³

2023

Agriculture, Ecosystems & Environment

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Alley cropping agroforestry mediates carabid beetle distribution at a micro-habitat scale

Cited by 3 publications

References 52 publications

Promoting generalist predators of crop pests in alley cropping agroforestry fields: Farming system matters

Promoting generalist predators of crop pests in alley cropping agroforestry fields: Farming system matters

Why Do Agroforestry Systems Enhance Biodiversity? Evidence From Habitat Amount Hypothesis Predictions

Biodiversity in temperate silvoarable systems: A systematic review

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