Geographic Variation in Migratory Grasshopper Recruitment under Projected Climate Change

John M. Humphreys, Robert B. Srygley and David H. Branson
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John M. Humphreys: Pest Management Research Unit, Agricultural Research Service, US Department of Agriculture, 1500 N. Central Avenue, Sidney, MT 59270, USA
Robert B. Srygley: Pest Management Research Unit, Agricultural Research Service, US Department of Agriculture, 1500 N. Central Avenue, Sidney, MT 59270, USA
David H. Branson: Pest Management Research Unit, Agricultural Research Service, US Department of Agriculture, 1500 N. Central Avenue, Sidney, MT 59270, USA

Geographies, 2022, vol. 2, issue 1, 1-19

Abstract: Climate change is expected to alter prevailing temperature, precipitation, cloud cover, and humidity this century, thereby modifying insect demographic processes and possibly increasing the frequency and intensity of rangeland and crop impacts by pest insects. We leveraged ten years of migratory grasshopper ( Melanoplus sanguinipes ) field surveys to assess the response of nymph recruitment to projected climate conditions through the year 2040. Melanoplus sanguinipes is the foremost pest of grain, oilseed, pulse, and rangeland forage crops in the western United States. To assess nymph recruitment, we developed a multi-level, joint modeling framework that individually assessed nymph and adult life stages while concurrently incorporating density-dependence and accounting for observation bias connected to preferential sampling. Our results indicated that nymph recruitment rates will exhibit strong geographic variation under projected climate change, with population sizes at many locations being comparable to those historically observed, but other locations experiencing increased insect abundances. Our findings suggest that alterations to prevailing temperature and precipitation regimes as instigated by climate change will amplify recruitment, thereby enlarging population sizes and potentially intensifying agricultural pest impacts by 2040.

Keywords: Melanoplus sanguinipes; grasshoppers; demographic; spatiotemporal; climate change; preferential sampling (search for similar items in EconPapers)
JEL-codes: Q1 Q15 Q5 Q53 Q54 Q56 Q57 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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