Abstract
Insectivorous bats are efficient predators of pest arthropods in agroecosystems. This pest control service has been estimated to be worth billions of dollars to agriculture globally. However, few studies have explicitly investigated the composition and abundance of dietary prey items consumed or assessed the ratio of pest and beneficial arthropods, making it difficult to evaluate the quality of the pest control service provided. In this study, we used metabarcoding to identify the prey items eaten by insectivorous bats over the cotton‐growing season in an intensive cropping region in northern New South Wales, Australia. We found that seven species of insectivorous bat (n = 58) consumed 728 prey species, 13 of which represented around 50% of total prey abundance consumed. Importantly, the identified prey items included major arthropod pests, comprising 65% of prey relative abundance and 13% of prey species recorded. Significant cotton pests such as Helicoverpa punctigera (Australian bollworm) and Achyra affinitalis (cotton webspinner) were detected in at least 76% of bat fecal samples, with Teleogryllus oceanicus (field crickets), Helicoverpa armigera (cotton bollworm), and Crocidosema plebejana (cotton tipworm) detected in 55% of bat fecal samples. Our results indicate that insectivorous bats are selective predators that exploit a narrow selection of preferred pest taxa and potentially play an important role in controlling lepidopteran pests on cotton farms. Our study provides crucial information for farmers to determine the service or disservice provided by insectivorous bats in relation to crops, for on‐farm decision making.
Highlights
Insectivorous bats consume a wide range of arthropods, some of which are considered major agricultural pests worldwide (Federico et al, 2008; Kunz, Braun de Torrez, Bauer, Lobova, & Fleming, 2011; Maine & Boyles, 2015; McCracken et al, 2012; Williams-Guillen, Perfecto, & Vandermeer, 2008)
Few studies have explicitly investigated the composition and abundance of dietary prey items or assessed the ratio of pest and beneficial arthropods consumed, making it difficult to assess the quality of the pest control service provided by bats
We asked three questions: (a) How diverse is the insectivorous bat community foraging in cotton crops over the cotton-growing season (November–March)? (b) Which prey items are consumed by insectivorous bats, and what are the relative quantities of pest and beneficial arthropods consumed? (c) Do the arthropods in insectivorous bat diets reflect arthropod prey abundance across the summer-growing season? This study enabled species-level dietary exploration of an insectivorous bat community to evaluate the contribution to natural pest control in transgenic cotton-growing landscapes
Summary
Insectivorous bats consume a wide range of arthropods, some of which are considered major agricultural pests worldwide (Federico et al, 2008; Kunz, Braun de Torrez, Bauer, Lobova, & Fleming, 2011; Maine & Boyles, 2015; McCracken et al, 2012; Williams-Guillen, Perfecto, & Vandermeer, 2008). Productivity by suppressing pest arthropods is high This pest control service has been estimated to be worth billions of dollars to agriculture globally by decreasing insect crop damage and increasing yield (Boyles, Cryan, McCracken, & Kunz, 2011; Cleveland et al, 2006; Maine & Boyles, 2015; Naylor & Ehrlich, 1997). Few studies have explicitly investigated the composition and abundance of dietary prey items or assessed the ratio of pest and beneficial arthropods consumed, making it difficult to assess the quality of the pest control service provided by bats. Identification of prey to the lowest taxonomic level is vital to determine the extent to which insectivorous bats provide a pest control service or disservice to high-value commodity crops such as transgenic cotton and corn. This study enabled species-level dietary exploration of an insectivorous bat community to evaluate the contribution to natural pest control in transgenic cotton-growing landscapes We asked three questions: (a) How diverse is the insectivorous bat community foraging in cotton crops over the cotton-growing season (November–March)? (b) Which prey items are consumed by insectivorous bats, and what are the relative quantities of pest and beneficial arthropods consumed? (c) Do the arthropods in insectivorous bat diets reflect arthropod prey abundance across the summer-growing season? This study enabled species-level dietary exploration of an insectivorous bat community to evaluate the contribution to natural pest control in transgenic cotton-growing landscapes
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