CCD/Neonicotinoid Data (Studies, Articles, Links) - Page 11
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  1. #201

    Default Re: CCD/Neonicotinoid Data (Studies, Articles, Links)

    Long-term effects of neonicotinoid insecticides on ants

    Abstract
    The widespread prophylactic usage of neonicotinoid insecticides has a clear impact on non-target organisms. However, the possible effects of long-term exposure on soil-dwelling organisms are still poorly understood especially for social insects with long-living queens. Here, we show that effects of chronic exposure to the neonicotinoid thiamethoxam on black garden ant colonies, Lasius niger, become visible before the second overwintering. Queens and workers differed in the residue-ratio of thiamethoxam to its metabolite clothianidin, suggesting that queens may have a superior detoxification system. Even though thiamethoxam did not affect queen mortality, neonicotinoid-exposed colonies showed a reduced number of workers and larvae indicating a trade-off between detoxification and fertility. Since colony size is a key for fitness, our data suggest long-term impacts of neonicotinoids on these organisms. This should be accounted for in future environmental and ecological risk assessments of neonicotinoid applications to prevent irreparable damages to ecosystems.

    Schläppi, D., Kettler, N., Straub, L. et al. Long-term effects of neonicotinoid insecticides on ants. Commun Biol 3, 335 (2020). https://doi.org/10.1038/s42003-020-1066-2

    https://www.nature.com/articles/s42003-020-1066-2

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  3. #202

    Default Re: CCD/Neonicotinoid Data (Studies, Articles, Links)

    Seek and you shall find: An assessment of the influence of the analytical methodologies on pesticide occurrences in honey bee-collected pollen with a systematic review

    Highlights
    • The analytical methodologies may underestimate the pesticide exposure on bees.
    • Pesticide occurrence in pollen is negatively associated with the detection limit.
    • In 4 pesticides, the detection limits were higher than their toxic doses.


    Abstract
    Honey bee mortality and colony losses have been reported worldwide. Although this phenomenon is caused by a combination of factors, agrochemicals have received special attention due to their potential effects on bees. In agricultural and urban environments bees are exposed to several compounds that may interact in unexpected ways, but information on the extent of pesticide exposure remains unclear. Several monitoring studies have been conducted to evaluate the field-realistic exposure of bees to pesticides after their release on the market. However, their outputs are difficult to compare and harmonize due to differences in the analytical methodologies and the sampling protocols (e.g. number of screened compounds and analysed samples, and detection limits (LODs)). Here, we hypothesize that the analytical methodologies used in the monitoring studies may strongly affect the pesticide occurrences in pollen underestimating the real pesticide exposure. By mean of a systematic literature review, we have collected relevant information on pesticide contaminations in the honey bee-collected pollen. Our findings showed that the pesticide occurrences were associated with the analytical methodologies and the real pesticide exposure has likely been underestimated in some monitoring studies. For four highly toxic compounds, the LOD used in these monitoring studies exceeded the doses that cause toxic effects on honey bees. We recommend that, especially for the highly toxic compounds, the LODs used in the monitoring studies should be low enough to exclude lethal or sublethal effects on bees and avoid “false negative” samples.


    Gioele Toselli, Fabio Sgolastra; Seek and you shall find: An assessment of the influence of the analytical methodologies on pesticide occurrences in honey bee-collected pollen with a systematic review; Chemosphere; Volume 258, November 2020, 127358; https://doi.org/10.1016/j.chemosphere.2020.127358; https://www.sciencedirect.com/scienc...45653520315514

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