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Declines in biodiversity and the abundance of pest species across land use gradients in Southeast Asia

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Abstract

Context

Changes in land use have disruptive effects on community structure, causing many species to disappear, though a few thrive and become pests.

Objectives

To gain understanding on how anthropogenic activity changes spatial patterns of native species diversity while favoring pests, we conducted rapid biodiversity assessments of dacine fruit flies across eight regions in Southeast Asia.

Methods

Male lure traps were maintained for 2 days along transects at 233 sites, in forest, agricultural and urban environments.

Results

A total of 8393 individuals were collected, belonging to 57 described and 4 new or unidentified species. The majority (78 %) of individuals belonged to 14 pest species, dominated by Bactrocera dorsalis (Hendel). The 57 species represent 38 % of those recorded from the region, indicating effective sampling. Individual flies were collected in highest numbers in urban and agricultural sites, but species diversity was low. Forest samples yielded fewer specimens but highest species diversity, suggesting a shift in community structure after disturbance, benefiting a few pest species at the expense of the broader community, even in the same genus and ecological guild.

Conclusions

Dacine fruit flies may be useful in assessing habitat quality and bait systems permit the execution of rapid biodiversity and multi-species conservation assessments. Our results apply to broader patterns concerning biodiversity loss and the emergence of pest species under increasingly intensive land use gradients, and demonstrate the remarkable loss of biodiversity over very narrow distances as forest is converted into agricultural use, hence the importance in maintaining a mosaic of native habitats.

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Acknowledgments

Collecting trips in Asia were funded through USDA-ARS Specific Cooperative Agreements 58-5320-9-382 and 58-5320-4-018, managed by the University of Hawaii’s College of Tropical Agriculture and Human Resources (UH-CTAHR). We greatly appreciate the help of Chi-Yeh Chien (Thai Royal Project Foundation), Johannes Ketellar (Chief Technical Advisor, FAO Inter-Country Programme for IPM, Thailand), Thongsavanh Taipangnavong and Vornthalom Chanthavong (FAO-IPM, Laos), Lira Chea and Ajay Markanday (FAO-IPM Cambodia), Prabhat Kumar (Asian Institute of Technology, Thailand) and Po-Yung Lai (UH-CTAHR), for permits and logistics in our fieldwork. Saba Young, Dan Nitta and Christopher Guo helped with molecular work. Dick Drew (Griffith University, Australia) provided the senior author with extensive training on fruit fly taxonomy over the years and has verified many of our species determinations. This work was made possible, in part, by a Cooperative Agreement from the United States Department of Agriculture through Farm Bill funding (project 3.0251) administered by the College of Tropical Agriculture and Human Resources. Additional research funding was provided by USDA-National Institute of Food and Agriculture Hatch projects HAW00942-H and HAW00956-H, administered by UH-CTAHR.

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Correspondence to Luc Leblanc.

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Leblanc, L., Jose, M.S., Wright, M.G. et al. Declines in biodiversity and the abundance of pest species across land use gradients in Southeast Asia. Landscape Ecol 31, 505–516 (2016). https://doi.org/10.1007/s10980-015-0276-3

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