Do pesticide and pathogen interactions drive wild bee declines?

Straub, Lars; Strobl, Verena; Yañez, Orlando; Albrecht, Matthias; Brown, Mark J. F.; Neumann, Peter

doi:10.1016/j.ijppaw.2022.06.001

Cited by 12 publications

(8 citation statements)

References 156 publications

(241 reference statements)

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“…In the case of parasites, the decline of some bumblebee species is correlated with a rise in the prevalence of V. bombi (Cameron et al 2011(Cameron et al , 2016. Brown concluded that we cannot determine the overall impact of pesticides and parasites on global bumblebee health due the nature of studies that we can, and cannot conduct (Straub et al 2022). Thus, a precautionary principle, which aims to reduce bumblebee exposure to pesticides and parasites as a consequence of anthropogenic change, should be implemented.…”

Section: Mark Brown: Parasites Pathogens and Pesticides: Impacts On B...mentioning

confidence: 99%

Protecting pollinators and our food supply: understanding and managing threats to pollinator health

et al. 2023

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Global pollinator declines threaten food production and natural ecosystems. The drivers of declines are complicated and driven by numerous factors such as pesticide use, loss of habitat, rising pathogens due to commercial bee keeping and climate change. Halting and reversing pollinator declines will require a multidisciplinary approach and international cooperation. Here, we summarize 20 presentations given in the symposium 'Protecting pollinators and our food supply: Understanding and managing threats to pollinator health' at the 19th Congress of the International Union for the Study of Social Insects in San Diego, 2022. We then synthesize the key findings and discuss future research areas such as better understanding the impact of anthropogenic stressors on wild bees.

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Section: Mark Brown: Parasites Pathogens and Pesticides: Impacts On B...mentioning

confidence: 99%

Protecting pollinators and our food supply: understanding and managing threats to pollinator health

et al. 2023

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“…Alternatively, persistence and transmission of Crithidia bombi can be negatively affected by exposure to sunlight (Figueroa et al 2019); in this case, more shaded environments in forests would facilitate Crithidia bombi transmission. Previous work on the influence of agricultural chemicals on Crithidia found no clear effects (Straub et al 2022), however other aspects of agriculture or urbanization could reduce these loads. There is also evidence to suggest that other insects can vector Crithidia bombi transmission such as flower flies (Davis et al 2021) or solitary bees (Figueroa et al 2021), and those insects may be more abundant in forested ecosystems.…”

Section: Discussionmentioning

confidence: 94%

Local habitat type influences bumble bee pathogen loads and bee species distributions

Gratton

McNeil

Grozinger

et al. 2023

Environmental Entomology

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Bumble bees (Hymenoptera: Apidae, Bombus Latreille) perform important ecological services in both managed and natural ecosystems. Anthropogenically induced change has altered floral resources, climate, and insecticide exposure, factors that impact health and disease levels in these bees. Habitat management presents a solution for improving bee health and biodiversity, but this requires better understanding of how different pathogens and bee species respond to habitat conditions. We take advantage of the washboard of repeated ridges (forested) and valleys (mostly developed) in central Pennsylvania to examine whether local variation in habitat type and other landscape factors influence bumble bee community composition and levels of 4 leading pathogens in the common eastern bumble bee, Bombus impatiens Cresson. Loads of viruses (DWV and BQCV) were found to be lowest in forest habitats, whereas loads of a gut parasite, Crithidia bombi, were highest in forests. Ridgetop forests hosted the most diverse bumble bee communities, including several habitat specialists. B. impatiens was most abundant in valleys, and showed higher incidence in areas of greater disturbance, including more developed, unforested, and lower floral resource sites, a pattern which mirrors its success in the face of anthropogenic change. Additionally, DNA barcoding revealed that B. sandersoni is much more common than is apparent from databases. Our results provide evidence that habitat type can play a large role in pathogen load dynamics, but in ways that differ by pathogen type, and point to a need for consideration of habitat at both macro-ecological and local spatial scales.

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“…The majority of this economically important pollination is carried out by bees [ 1 ], but numerous studies indicate that bees are threatened and in decline [ 2 , 3 ], posing a threat to pollination services. A range of anthropogenic pressures are believed to threaten bee health, from land-use change [ 4 ] to pesticides [ 5 , 6 , 7 ], acting both individually and in combination [ 8 ]. Two stressors in particular—pesticides and parasites—have received significant research attention due to the large impacts they may have on bee health [ 5 , 7 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Parasite and Pesticide Impacts on the Bumblebee (Bombus terrestris) Haemolymph Proteome

Askri

Straw

Arafah

et al. 2023

IJMS

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Pesticides pose a potential threat to bee health, especially in combination with other stressors, such as parasites. However, pesticide risk assessment tests pesticides in isolation from other stresses, i.e., on otherwise healthy bees. Through molecular analysis, the specific impacts of a pesticide or its interaction with another stressor can be elucidated. Molecular mass profiling by MALDI BeeTyping® was used on bee haemolymph to explore the signature of pesticidal and parasitic stressor impacts. This approach was complemented by bottom-up proteomics to investigate the modulation of the haemoproteome. We tested acute oral doses of three pesticides—glyphosate, Amistar and sulfoxaflor—on the bumblebee Bombus terrestris, alongside the gut parasite Crithidia bombi. We found no impact of any pesticide on parasite intensity and no impact of sulfoxaflor or glyphosate on survival or weight change. Amistar caused weight loss and 19–41% mortality. Haemoproteome analysis showed various protein dysregulations. The major pathways dysregulated were those involved in insect defences and immune responses, with Amistar having the strongest impact on these dysregulated pathways. Our results show that even when no response can be seen at a whole organism level, MALDI BeeTyping® can detect effects. Mass spectrometry analysis of bee haemolymph provides a pertinent tool to evaluate stressor impacts on bee health, even at the level of individuals.

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Do pesticide and pathogen interactions drive wild bee declines?

Cited by 12 publications

References 156 publications

Protecting pollinators and our food supply: understanding and managing threats to pollinator health

Protecting pollinators and our food supply: understanding and managing threats to pollinator health

Local habitat type influences bumble bee pathogen loads and bee species distributions

Parasite and Pesticide Impacts on the Bumblebee (Bombus terrestris) Haemolymph Proteome

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