Insect diversity on high-input, low-input and organic banana farms
(English)In: Agricultural and Forest Entomology, ISSN 1461-9555, E-ISSN 1461-9563Article in journal (Refereed) Submitted
High intensity of pesticide use in banana production is problematic not only for human health and the surrounding environment, but can threaten the provision of ecosystem services on which farm productivity depends. This research investigates the effects of varying pesticide-use intensities on on-farm insect diversity, using three different types of farm management systems: high pesticide input conventional system, reduced pesticide input conventional system and organic system. Insect sampling was done using pitfall and yellow bowl traps, left for a 24-hour period at 2 locations inside the banana farm, at the edge of the farm, and in adjacent forest. Species were classified to family level and then morphospecies. Insect species community composition and diversity were compared using multivariate statistics with ordination analysis and Monte Carlo permutation testing, and revealed that each of the management systems were significantly different from each other for both trap types. Insect diversity decreased as production management increased its pesticide use. Reduced insect diversity resulted in fewer functional groups and fewer insect families assuming different functions essential to ecosystem health. Organic farms had similar species composition on the farm compared to adjacent forest sites, whereas species composition increasingly differed between farm and forest sites as pesticide-use intensity increased. We conclude that while organic production has minimal impact on insect biodiversity, even small reductions in pesticide-use intensity can have a significantly positive impact on on-farm insect biodiversity and functional roles supported.
banana production, management practices, Costa Rica, insect diversity
Research subject Ecotoxicology
IdentifiersURN: urn:nbn:se:su:diva-61848OAI: oai:DiVA.org:su-61848DiVA: diva2:438173