18 results on '"Mengel, Doreen"'
Search Results
2. Neonicotinoid insecticides negatively affect performance measures of non-target terrestrial arthropods : a meta-analysis
- Author
-
Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., and Mengel, Doreen
- Published
- 2018
3. Impacts of neonicotinoid seed treatments on the wild bee community in agricultural field margins
- Author
-
Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Abney, Robert, Mengel, Doreen, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Abney, Robert, and Mengel, Doreen
- Abstract
Wild bees support global agroecosystems via pollination of agricultural crops and maintaining diverse plant communities. However, with an increased reliance on pesticides to enhance crop production, wild bee communities may inadvertently be affected through exposure to chemical residues. Laboratory and semi-field studies have demonstrated lethal and sublethal effects of neonicotinoids on limited genera (e.g., Apis, Bombus, Megachile), yet full field studies evaluating impacts to wild bee communities remain limited. Here, we conducted a two-year field study to assess whether neonicotinoid seed treatment and presence in environmental media (e.g., soil, flowers) influenced bee nest and diet guild abundance and richness. In 2017 and 2018, we planted 23 Missouri agricultural fields to soybeans (Glycine max) using one of three seed treatments: untreated (no insecticide), treated (imidadoprid), or previously-treated (untreated, but neonicotinoid use prior to 2017). During both years, wild bees were collected in study field margins monthly (May to September) in tandem with soil and flowers from fields and field margins that were analyzed for neonicotinoid residues. Insecticide presence in soils and flowers varied over the study with neonicotinoids infrequently detected in both years within margin flowers (0%), soybean flowers (<1%), margin soils (<8%), and field soils (similar to 39%). Wild bee abundance and species richness were not significantly different among field treatments. In contrast, neonicotinoid presence in field soils was associated with significantly lower richness (ground- and aboveground-nesting, diet generalists) of wild bee guilds. Our findings support that soil remains an underexplored route of exposure and long-term persistence of neonicotinoids in field soils may lead to reduced diversity in regional bee communities. Future reduction or elimination of neonicotinoid seed treatment use on areas managed for wildlife may facilitate conservation goals to sus
- Published
- 2021
- Full Text
- View/download PDF
4. Clothianidin decomposition in Missouri wetland soils
- Author
-
Beringer, Chelsey J., Goyne, Keith W., Lerch, Robert N., Webb, Elisabeth B., Mengel, Doreen, Beringer, Chelsey J., Goyne, Keith W., Lerch, Robert N., Webb, Elisabeth B., and Mengel, Doreen
- Abstract
Neonicotinoid pesticides can persist in soils for extended time periods; however, they also have a high potential to contaminate ground and surface waters. Studies have reported negative effects associated with neonicotinoids and nontarget taxa, including aquatic invertebrates, pollinating insect species, and insectivorous birds. This study evaluated factors associated with clothianidin (CTN) degradation and sorption in Missouri wetland soils to assess the potential for wetland soils to mitigate potential environmental risks associated with neonicotinoids. Solid-to-solution partition coefficients (K-d) for CTN sorption to eight wetland soils were determined via single-point sorption experiments, and sorption isotherm experiments were conducted using the two most contrasting soils. Clothianidin degradation was determined under oxic and anoxic conditions over 60 d. Degradation data were fit to zero- and first-order kinetic decay models to determine CTN half-life (t(0.5)). Sorption results indicated CTN sorption to wetland soil was relatively weak (average K-d, 3.58 L kg(-1)); thus, CTN has the potential to be mobile and bioavailable within wetland soils. However, incubation results showed anoxic conditions significantly increased CTN degradation rates in wetland soils (anoxic average t(0.5), 27.2 d; oxic average t(0.5), 149.1 d). A significant negative correlation was observed between anoxic half-life values and soil organic C content (r(2) = .782; p = .046). Greater CTN degradation rates in wetland soils under anoxic conditions suggest that managing wetlands to facilitate anoxic conditions could mitigate CTN presence in the environment and reduce exposure to nontarget organisms.
- Published
- 2021
- Full Text
- View/download PDF
5. Impacts of neonicotinoid seed treatments on the wild bee community in agricultural field margins
- Author
-
Forest Resources and Environmental Conservation, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Abney, Robert, Mengel, Doreen, Forest Resources and Environmental Conservation, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Abney, Robert, and Mengel, Doreen
- Abstract
Wild bees support global agroecosystems via pollination of agricultural crops and maintaining diverse plant communities. However, with an increased reliance on pesticides to enhance crop production, wild bee communities may inadvertently be affected through exposure to chemical residues. Laboratory and semi-field studies have demonstrated lethal and sublethal effects of neonicotinoids on limited genera (e.g., Apis, Bombus, Megachile), yet full field studies evaluating impacts to wild bee communities remain limited. Here, we conducted a two-year field study to assess whether neonicotinoid seed treatment and presence in environmental media (e.g., soil, flowers) influenced bee nest and diet guild abundance and richness. In 2017 and 2018, we planted 23 Missouri agricultural fields to soybeans (Glycine max) using one of three seed treatments: untreated (no insecticide), treated (imidadoprid), or previously-treated (untreated, but neonicotinoid use prior to 2017). During both years, wild bees were collected in study field margins monthly (May to September) in tandem with soil and flowers from fields and field margins that were analyzed for neonicotinoid residues. Insecticide presence in soils and flowers varied over the study with neonicotinoids infrequently detected in both years within margin flowers (0%), soybean flowers (<1%), margin soils (<8%), and field soils (similar to 39%). Wild bee abundance and species richness were not significantly different among field treatments. In contrast, neonicotinoid presence in field soils was associated with significantly lower richness (ground- and aboveground-nesting, diet generalists) of wild bee guilds. Our findings support that soil remains an underexplored route of exposure and long-term persistence of neonicotinoids in field soils may lead to reduced diversity in regional bee communities. Future reduction or elimination of neonicotinoid seed treatment use on areas managed for wildlife may facilitate conservation goals to sus
- Published
- 2021
6. Clothianidin decomposition in Missouri wetland soils
- Author
-
Forest Resources and Environmental Conservation, Beringer, Chelsey J., Goyne, Keith W., Lerch, Robert N., Webb, Elisabeth B., Mengel, Doreen, Forest Resources and Environmental Conservation, Beringer, Chelsey J., Goyne, Keith W., Lerch, Robert N., Webb, Elisabeth B., and Mengel, Doreen
- Abstract
Neonicotinoid pesticides can persist in soils for extended time periods; however, they also have a high potential to contaminate ground and surface waters. Studies have reported negative effects associated with neonicotinoids and nontarget taxa, including aquatic invertebrates, pollinating insect species, and insectivorous birds. This study evaluated factors associated with clothianidin (CTN) degradation and sorption in Missouri wetland soils to assess the potential for wetland soils to mitigate potential environmental risks associated with neonicotinoids. Solid-to-solution partition coefficients (K-d) for CTN sorption to eight wetland soils were determined via single-point sorption experiments, and sorption isotherm experiments were conducted using the two most contrasting soils. Clothianidin degradation was determined under oxic and anoxic conditions over 60 d. Degradation data were fit to zero- and first-order kinetic decay models to determine CTN half-life (t(0.5)). Sorption results indicated CTN sorption to wetland soil was relatively weak (average K-d, 3.58 L kg(-1)); thus, CTN has the potential to be mobile and bioavailable within wetland soils. However, incubation results showed anoxic conditions significantly increased CTN degradation rates in wetland soils (anoxic average t(0.5), 27.2 d; oxic average t(0.5), 149.1 d). A significant negative correlation was observed between anoxic half-life values and soil organic C content (r(2) = .782; p = .046). Greater CTN degradation rates in wetland soils under anoxic conditions suggest that managing wetlands to facilitate anoxic conditions could mitigate CTN presence in the environment and reduce exposure to nontarget organisms.
- Published
- 2021
7. Beyond neonicotinoids - Wild pollinators are exposed to a range of pesticides while foraging in agroecosystems
- Author
-
Main, Anson R., Hladik, Michelle L., Webb, Elisabeth B., Goyne, Keith W., Mengel, Doreen, Main, Anson R., Hladik, Michelle L., Webb, Elisabeth B., Goyne, Keith W., and Mengel, Doreen
- Abstract
Pesticide exposure is a growing global concern for pollinator conservation. While most current pesticide studies have specifically focused on the impacts of neonicotinoid insecticides toward honeybees and some native bee species, wild pollinators may be exposed to a broader range of agrochemicals. In 2016 and 2017 we collected a total of 637 wild bees and butterflies from the margins of cultivated agricultural fields situated on five Conservation Areas in mid-northern Missouri. Pollinators were composited by individual genera (90 samples) and whole tissues were then analyzed for the presence of 168 pesticides and degradation products. At least one pesticide was detected (% frequency) in the following wild bee genera: Bombus (96%), Eucera (75%), Melissodes (73%), Pnlothrix (50%), Xylocopa (50%), and Megachile ( 17%). Similarly, at least one pesticide was detected in the following lepidopteran genera: Hemaris (100%), Hylephila (75%), Danaus (60%), and Colitis (50%). Active ingredients detected in >2% of overall pollinator samples were as follows: metolachlor (24%), tebuconazole (22%), atrazine (18%), iinidadoprid desnitro (13%), bifenthrin (9%), flumetralin (9%), p, p'-DDD (6%), tebupirimfos (4%), Iludioxonil (4%), flutriafol (3%), cyproconazole (2%), and oxacliazon (2%). Concentrations of individual pesticides ranged from 2 to 174 ng/g. Results of this pilot field study indicate that wild pollinators arc exposed to and are potentially bioaccumulating a wide variety of pesticides in addition to neonicotinoids. Here, we provide evidence that wild bee and butterfly genera may face exposure to a wide range of insecticides, fungicides, and herbicides despite being collected from areas managed for conservation. Therefore, even with the presence of extensive habitat, minimal agricultural activity on Conservation Areas may expose pollinators to a range of pesticides. Published by Elsevier B.V.
- Published
- 2020
- Full Text
- View/download PDF
8. Reduced species richness of native bees in field margins associated with neonicotinoid concentrations in non-target soils
- Author
-
Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Mengel, Doreen, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., and Mengel, Doreen
- Abstract
Native bees are in decline as many species are sensitive to habitat loss, climate change, and non-target exposure to synthetic pesticides. Recent laboratory and semi-field assessments of pesticide impacts on bees have focused on neonicotinoid insecticides. However, field studies evaluating influences of neonicotinoid seed treatments on native bee communities of North America are absent from the literature. On four Conservation Areas of Missouri, we sampled row-cropped (treated, n = 15) and reference (untreated, n = 9) agricultural fields, and their surrounding field margins for neonicotinoids in soil and non-target vegetation (i.e., native wildflowers). Wildflowers were further collected and screened for the presence of fungicides. Concurrently, we sampled native bees over three discrete time points throughout the agricultural growing season to assess potential impacts of seed treatment use on local bee populations over time. Neonicotinoids were detected in 87% to 100% of treated field soils and 22% to 56% of reference field soils. In adjacent field margin soils, quantifiable concentrations were measured near treated (53% to 93% detection) and untreated fields (33% to 56% detection). Fungicides were detected in < 40% of wildflowers, whereas neonicotinoids were rarely detected in field margin vegetation (< 7%). Neonicotinoid concentrations in margin soils were negatively associated with native bee richness (beta = -0.21, P < 0.05). Field margins with a combination of greater neonicotinoid concentrations in soil and fungicides in wildflowers also contained fewer wild bee species (beta = -0.21, P < 0.001). By comparison, bee abundance was positively influenced by the number of wildflower species in bloom with no apparent impact of pesticides. Results of this study indicate that neonicotinoids in soil are a potential route of exposure for pollinator communities, specifically ground-nesting species. Importantly, native bee richness in non-target field margins may be nega
- Published
- 2020
- Full Text
- View/download PDF
9. Beyond neonicotinoids - Wild pollinators are exposed to a range of pesticides while foraging in agroecosystems
- Author
-
Forest Resources and Environmental Conservation, Main, Anson R., Hladik, Michelle L., Webb, Elisabeth B., Goyne, Keith W., Mengel, Doreen, Forest Resources and Environmental Conservation, Main, Anson R., Hladik, Michelle L., Webb, Elisabeth B., Goyne, Keith W., and Mengel, Doreen
- Abstract
Pesticide exposure is a growing global concern for pollinator conservation. While most current pesticide studies have specifically focused on the impacts of neonicotinoid insecticides toward honeybees and some native bee species, wild pollinators may be exposed to a broader range of agrochemicals. In 2016 and 2017 we collected a total of 637 wild bees and butterflies from the margins of cultivated agricultural fields situated on five Conservation Areas in mid-northern Missouri. Pollinators were composited by individual genera (90 samples) and whole tissues were then analyzed for the presence of 168 pesticides and degradation products. At least one pesticide was detected (% frequency) in the following wild bee genera: Bombus (96%), Eucera (75%), Melissodes (73%), Pnlothrix (50%), Xylocopa (50%), and Megachile ( 17%). Similarly, at least one pesticide was detected in the following lepidopteran genera: Hemaris (100%), Hylephila (75%), Danaus (60%), and Colitis (50%). Active ingredients detected in >2% of overall pollinator samples were as follows: metolachlor (24%), tebuconazole (22%), atrazine (18%), iinidadoprid desnitro (13%), bifenthrin (9%), flumetralin (9%), p, p'-DDD (6%), tebupirimfos (4%), Iludioxonil (4%), flutriafol (3%), cyproconazole (2%), and oxacliazon (2%). Concentrations of individual pesticides ranged from 2 to 174 ng/g. Results of this pilot field study indicate that wild pollinators arc exposed to and are potentially bioaccumulating a wide variety of pesticides in addition to neonicotinoids. Here, we provide evidence that wild bee and butterfly genera may face exposure to a wide range of insecticides, fungicides, and herbicides despite being collected from areas managed for conservation. Therefore, even with the presence of extensive habitat, minimal agricultural activity on Conservation Areas may expose pollinators to a range of pesticides. Published by Elsevier B.V.
- Published
- 2020
10. Reduced species richness of native bees in field margins associated with neonicotinoid concentrations in non-target soils
- Author
-
Forest Resources and Environmental Conservation, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Mengel, Doreen, Forest Resources and Environmental Conservation, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., and Mengel, Doreen
- Abstract
Native bees are in decline as many species are sensitive to habitat loss, climate change, and non-target exposure to synthetic pesticides. Recent laboratory and semi-field assessments of pesticide impacts on bees have focused on neonicotinoid insecticides. However, field studies evaluating influences of neonicotinoid seed treatments on native bee communities of North America are absent from the literature. On four Conservation Areas of Missouri, we sampled row-cropped (treated, n = 15) and reference (untreated, n = 9) agricultural fields, and their surrounding field margins for neonicotinoids in soil and non-target vegetation (i.e., native wildflowers). Wildflowers were further collected and screened for the presence of fungicides. Concurrently, we sampled native bees over three discrete time points throughout the agricultural growing season to assess potential impacts of seed treatment use on local bee populations over time. Neonicotinoids were detected in 87% to 100% of treated field soils and 22% to 56% of reference field soils. In adjacent field margin soils, quantifiable concentrations were measured near treated (53% to 93% detection) and untreated fields (33% to 56% detection). Fungicides were detected in < 40% of wildflowers, whereas neonicotinoids were rarely detected in field margin vegetation (< 7%). Neonicotinoid concentrations in margin soils were negatively associated with native bee richness (beta = -0.21, P < 0.05). Field margins with a combination of greater neonicotinoid concentrations in soil and fungicides in wildflowers also contained fewer wild bee species (beta = -0.21, P < 0.001). By comparison, bee abundance was positively influenced by the number of wildflower species in bloom with no apparent impact of pesticides. Results of this study indicate that neonicotinoids in soil are a potential route of exposure for pollinator communities, specifically ground-nesting species. Importantly, native bee richness in non-target field margins may be nega
- Published
- 2020
11. Secretive marsh bird habitat associations in the Mississippi Flyway: a meta-analysis
- Author
-
Malone, Kristen M., primary, Webb, Elisabeth B., additional, Mengel, Doreen, additional, Kearns, Laura J., additional, Matteson, Sumner W., additional, and McKellar, Ann E., additional
- Published
- 2021
- Full Text
- View/download PDF
12. Field-level characteristics influence wild bee functional guilds on public lands managed for conservation
- Author
-
Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Mengel, Doreen, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., and Mengel, Doreen
- Abstract
Throughout the Midwestern US, many public lands set aside for conservation engage in management activities (e.g., agriculture) that may act as stressors on wild bee populations. Several studies have investigated how wild bees respond to large-scale agriculture production; however, there has been limited assessment of how wild bees may be impacted by agricultural activity on public lands or how local variables may influence bee communities in these same areas. In this study, we assessed the abundance and richness of wild bee floral and nesting guilds at 30 agricultural field margins located on five Conservation Areas in Missouri. Generally, regardless of guild, bee abundance and richness was greater in field margins with more floral diversity and taller vegetation. Bee guilds responded negatively to agricultural production in Conservation Areas with fewer soil- and cavity-nesting bees collected in margins adjacent to annually cropped fields. Although fewer diet specialists were collected, specialist bee abundance and richness was greater in margins near fields that were uncropped (i.e., vegetated, but not row-cropped) during the previous year. Overall, the percentage of trees and shrubs within 800 m of study fields (i.e., "woodland") was negatively associated with abundance and richness of bees, but specifically, reduced richness of soil-nesters and diet specialists. Our findings indicate agricultural management activities on public lands may lead to decreased abundance and richness of wild bee guilds. If public lands are to be managed for species diversity, including wild bees, maintaining diverse plant communities with taller vegetation (>100 cm) near cultivated fields and/or modifying agricultural production practices on public lands may greatly improve the conservation of local bee communities. (C) 2019 The Authors. Published by Elsevier B.V.
- Published
- 2019
- Full Text
- View/download PDF
13. Field-level characteristics influence wild bee functional guilds on public lands managed for conservation
- Author
-
Forest Resources and Environmental Conservation, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., Mengel, Doreen, Forest Resources and Environmental Conservation, Main, Anson R., Webb, Elisabeth B., Goyne, Keith W., and Mengel, Doreen
- Abstract
Throughout the Midwestern US, many public lands set aside for conservation engage in management activities (e.g., agriculture) that may act as stressors on wild bee populations. Several studies have investigated how wild bees respond to large-scale agriculture production; however, there has been limited assessment of how wild bees may be impacted by agricultural activity on public lands or how local variables may influence bee communities in these same areas. In this study, we assessed the abundance and richness of wild bee floral and nesting guilds at 30 agricultural field margins located on five Conservation Areas in Missouri. Generally, regardless of guild, bee abundance and richness was greater in field margins with more floral diversity and taller vegetation. Bee guilds responded negatively to agricultural production in Conservation Areas with fewer soil- and cavity-nesting bees collected in margins adjacent to annually cropped fields. Although fewer diet specialists were collected, specialist bee abundance and richness was greater in margins near fields that were uncropped (i.e., vegetated, but not row-cropped) during the previous year. Overall, the percentage of trees and shrubs within 800 m of study fields (i.e., "woodland") was negatively associated with abundance and richness of bees, but specifically, reduced richness of soil-nesters and diet specialists. Our findings indicate agricultural management activities on public lands may lead to decreased abundance and richness of wild bee guilds. If public lands are to be managed for species diversity, including wild bees, maintaining diverse plant communities with taller vegetation (>100 cm) near cultivated fields and/or modifying agricultural production practices on public lands may greatly improve the conservation of local bee communities. (C) 2019 The Authors. Published by Elsevier B.V.
- Published
- 2019
14. Field-level characteristics influence wild bee functional guilds on public lands managed for conservation
- Author
-
Main, Anson R., primary, Webb, Elisabeth B., additional, Goyne, Keith W., additional, and Mengel, Doreen, additional
- Published
- 2019
- Full Text
- View/download PDF
15. Virginia and Yellow Rail Autumn Migration Phenology and Habitat Use
- Author
-
Fournier, Auriel, Mengel, Doreen C., and Krementz, David G.
- Abstract
Virginia and Yellow Rail Autumn Migration Phenology and Habitat Use in the Mississippi Flyway Auriel M.V. Fournier *(1), Doreen C. Mengel (2), David G. Krementz (3) 1. Arkansas Cooperative Fish and Wildlife Research Unit, University of Arkansas, 1 University Drive, Fayetteville, AR 72701 2. Missouri Department of Conservation Resource Science Division, 3500 E Gans Rd, Columbia, MO 65201 3. USGS Arkansas Cooperative Fish and Wildlife Research Unit, University of Arkansas, 1 University Drive, Fayetteville, AR 72701 Virginia and Yellow Rails are elusive, poorly studied marshbirds found across North America with a specific lack of information about their autumn migration ecology and migratory habitat use. We conducted nocturnal surveys across 11 public wetlands in Missouri, USA from 2012-2016, and compared the timing of autumn migration from our surveys with from three opportunistic datasets: 1) eBird records, 2) building strikes, and 3) state ornithological records. The timing of Virginia Rail autumn migration varied between the opportunistic data and our surveys. Opportunistic data had two peaks, while our surveys had a single peak the second week in October. Yellow Rail autumn migration through Missouri peaked earlier in our surveys than opportunistic datasets which peaked during the second week in October. Both rails were found in moist soil habitats, however Virginia Rails selected perennial species more than was available, while Yellow Rails selected annual species. Both species showed no selection for water depth and used shallowly flooded wetlands. Understanding the autumn migration period and habitat requirements will allow wetland managers to better manage lands for autumn migrating Virginia and Yellow Rails.
- Published
- 2017
- Full Text
- View/download PDF
16. Sora ( Porzana carolina ) autumn migration habitat use
- Author
-
Fournier, Auriel M. V., primary, Mengel, Doreen C., additional, and Krementz, David G., additional
- Published
- 2018
- Full Text
- View/download PDF
17. Habitat Use of Autumn Migrating Sora in the Mississippi Flyway
- Author
-
Fournier, Auriel, Mengel, Doreen C., and Krementz, David G.
- Abstract
Sora (Porzana carolina) habitat use during autumn migration has been poorly studied resulting in limited information upon which to base wetland management decisions that consider rails and other waterbirds. We performed nocturnal distance-sampling surveys from ATVs on eleven state and federal wetland properties in Missouri from 2012-2015. We examined covariates related to vegetation species percent cover, horizontal structure and water depth to explain Sora density using hierarchical distance sampling models in R package ‘unmarked’. Sora density was related to average water depth, percent interspersion and percent cover of non-persistent moist soil plants. Questions still remain about how the timing of water impacts Sora during autumn migration since peak water depths are not reached till late in migration in the Mississippi Flyway.
- Published
- 2016
- Full Text
- View/download PDF
18. Sora migration and Wetland Management
- Author
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Fournier, Auriel, Mengel, Doreen, Krementz, David, and Raedeke, Andy
- Abstract
Preliminary Results after 2014 field season examining the difference between timing of water for rails and waterfowl abundance during fall migration/wintering.
- Published
- 2014
- Full Text
- View/download PDF
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