Modeling fall migration pathways and spatially identifying potential migratory hazards for the eastern monarch butterfly

Tracy, James L.; Kantola, Tuula; Coulson, Robert N.

doi:10.1007/s10980-019-00776-0

Cited by 36 publications

(40 citation statements)

References 54 publications

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“…While our estimates use data from 1997-2012, it is expected that the overall use patterns have remained consistent in recent years (if anything, use of neonicotinoid seed treatments in field crops has increased 56 ,) and many datasets documenting insect declines encompass the time period in our study 12,13,15 . Furthermore, these national maps of bee toxic load, in combination with maps examining insect abundance and ecosystem services 57 , can be used to identify regions that should be prioritized for conservation (areas where insect abundance, diversity, or ecosystem services are high and insecticide hazard is low) or mitigation (areas where abundance of imperiled species, such as monarch butterflies, is high 58 and insecticide hazard is also high). While there are clearly limitations to this analysis, it complements more traditional 'bottom-up' approaches to ecotoxicology by enabling 'top-down' research at the landscape scales at which insect populations and ecosystem services are structured 59 .…”

Section: Discussionmentioning

confidence: 99%

County-level analysis reveals a rapidly shifting landscape of insecticide hazard to honey bees (Apis mellifera) on US farmland

Douglas

Sponsler

Lonsdorf

et al. 2020

Sci Rep

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Each year, millions of kilograms of insecticides are applied to crops in the US. While insecticide use supports food, fuel, and fiber production, it can also threaten non-target organisms, a concern underscored by mounting evidence of widespread decline of pollinator populations. Here, we integrate several public datasets to generate county-level annual estimates of total ‘bee toxic load’ (honey bee lethal doses) for insecticides applied in the US between 1997–2012, calculated separately for oral and contact toxicity. To explore the underlying components of the observed changes, we divide bee toxic load into extent (area treated) and intensity (application rate x potency). We show that while contact-based bee toxic load remained relatively steady, oral-based bee toxic load increased roughly 9-fold, with reductions in application rate outweighed by disproportionate increases in potency (toxicity/kg) and extent. This pattern varied markedly by region, with the greatest increase seen in Heartland (121-fold increase), likely driven by use of neonicotinoid seed treatments in corn and soybean. In this “potency paradox”, farmland in the central US has become more hazardous to bees despite lower volumes of insecticides applied, raising concerns about insect conservation and highlighting the importance of integrative approaches to pesticide use monitoring.

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Section: Discussionmentioning

confidence: 99%

County-level analysis reveals a rapidly shifting landscape of insecticide hazard to honey bees (Apis mellifera) on US farmland

Douglas

Sponsler

Lonsdorf

et al. 2020

Sci Rep

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show abstract

“…Previous analyses disagree about whether US insecticide use is increasing or decreasing, a 50 question of significant importance given the putative role of insecticides in recent insect declines. 51 We integrated information from multiple national databases to estimate 'insect toxic load ' 52 (represented as honey bee lethal doses) of the agricultural insecticides applied in each US county 53 from 1997 to 2012, and factors responsible for its change. Across the US, insect toxic load -54 calculated on the basis of oral toxicity -increased 9-fold.…”

Section: Significance Statement 49mentioning

confidence: 99%

Rising insecticide potency outweighs falling application rate to make US farmland increasingly hazardous to insects

et al. 2019

Preprint

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28Each year, millions of kilograms of insecticides are applied to crops in the US. While insecticide 29 use supports food, fuel, and fiber production, it can also threaten non-target organisms, a concern 30 underscored by mounting evidence of widespread insect decline. Nevertheless, answers to basic 31 questions about the spatiotemporal patterns of insecticide use remain elusive, due in part to the 32 inherent complexity of insecticide use, and exacerbated by the dispersed nature of the relevant 33 data, divided between several government repositories. Here, we integrate these public datasets 34 to generate county-level annual estimates of total 'insect toxic load' (honey bee lethal doses) for 35 insecticides applied in the US between 1997-2012, calculated separately for oral and contact 36 toxicity. To explore the underlying drivers of the observed changes, we divide insect toxic load 37 into the components of extent (area treated) and intensity (application rate x potency). We show 38 that while contact-based insect toxic load remained relatively steady over the period of our 39 analysis, oral-based insect toxic load increased roughly 9-fold, with reductions in application rate 40 outweighed by disproportionate increases in potency (toxicity/kg) and increases in extent. This 41 pattern varied markedly by region, with the greatest increases seen in Heartland and Northern 42Great Plains regions, likely driven by use of neonicotinoid seed treatments in corn and soybean. 43In this "potency paradox," US farmland has become more hazardous to insects despite lower 44 volumes of insecticides applied, raising serious concerns about insect conservation and 45 highlighting the importance of integrative approaches to pesticide use monitoring. 46 47 48 the potency (toxicity/kg) of insecticides applied and in the area treated; the volume of 56 insecticides applied declined. Toxic load increased most dramatically in regions where 57 neonicotinoid seed treatments for field crops are commonly used. 58 59 395

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“…However, this data should be accessible to researchers at reasonable costs (Senf et al 2017b). Citizen science data is already utilized in ecology (e.g., Tracy et al 2019). A new platform of crowd sensed data, including imagery and video data, is also becoming increasingly available (Toth and Józ'ków 2016).…”

Section: Developing Remote Sensing In Insect Disturbance Monitoringmentioning

confidence: 99%

Forest health monitoring in transition: Evaluating insect-induced disturbances in forested landscapes at varying spatial scales

Kantola¹

2019

Diss. For.

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Modeling fall migration pathways and spatially identifying potential migratory hazards for the eastern monarch butterfly

Cited by 36 publications

References 54 publications

County-level analysis reveals a rapidly shifting landscape of insecticide hazard to honey bees (Apis mellifera) on US farmland

County-level analysis reveals a rapidly shifting landscape of insecticide hazard to honey bees (Apis mellifera) on US farmland

Rising insecticide potency outweighs falling application rate to make US farmland increasingly hazardous to insects

Forest health monitoring in transition: Evaluating insect-induced disturbances in forested landscapes at varying spatial scales

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