A food-ingested sublethal concentration of thiamethoxam has harmful effects on the stingless bee Melipona scutellaris
| Autor: | José Bruno Malaquias, Osmar Malaspina, Ana Luiza Mendes dos Reis, Jéssica K. S. Pachú, Annelise de Souza Rosa-Fontana, Lucas Miotelo, Thaisa Cristina Roat |
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| Přispěvatelé: | Universidade Estadual Paulista (UNESP), Luiz de Queiroz College of Agriculture (ESALQ) |
| Rok vydání: | 2022 |
| Předmět: |
Insecticides
Malpighian tubule system Environmental Engineering Stingless bee Health Toxicology and Mutagenesis Longevity Basal labyrinth POLINIZAÇÃO Zoology Lethal Dose 50 Excretion chemistry.chemical_compound Midgut Neonicotinoid Animals Environmental Chemistry Melipona scutellaris biology Pollinators fungi Public Health Environmental and Occupational Health Mushroom body General Medicine General Chemistry Bees Malpighian tubules biology.organism_classification Pollution chemistry Thiamethoxam Digestive System |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2022-04-29T08:34:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-02-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) In recent years, the importance of bee's biodiversity in the Neotropical region has been evidencing the relevance of including native bees in risk assessments. Therefore, the sublethal effects of the insecticide thiamethoxam on the survival and morphological parameters of the stingless bee Melipona scutellaris were investigated in the present study. Cells from both non-target organs (Malpighian tubules and midgut) and target organs (brain) were analyzed for morphological alterations using light microscopy and transmission electron microscopy. The findings showed that when M. scutellaris foragers were exposed to a sublethal concentration of thiamethoxam (LC50/100 = 0.000543 ng a. i./μL), longevity was not reduced but brain function was affected, even with the non-target organs attempting to detoxify. The cellular damage in all the organs was mostly reflected in irregular nuclei shape and condensed chromatin, indicating cell death. The most frequent impairments in the Malpighian tubules were loss of microvilli, disorganization of the basal labyrinth, and cytoplasmic loss. These characteristics are related to an attempt by the cells to increase the excretion process, probably because of the high number of toxic molecules that reach the Malpighian tubules and need to be secreted. In general, damages that compromise the absorption of nutrients, excretion, memory, and learning processes, which are essential for the survival of M. scutellaris, were found. The present results also fill in gaps on how these bees respond to thiamethoxam exposure and will be useful in future risk assessments for the conservation of bee biodiversity. Department of General and Applied Biology Institute of Biosciences São Paulo State University (UNESP) Department of Entomology and Acarology Luiz de Queiroz College of Agriculture (ESALQ) Department of Biostatistics Institute of Biosciences e IBB São Paulo State University (UNESP) Department of General and Applied Biology Institute of Biosciences São Paulo State University (UNESP) Department of Biostatistics Institute of Biosciences e IBB São Paulo State University (UNESP) FAPESP: 2012/13370-8 FAPESP: 2013/21832-4 FAPESP: 2013/21833-0 FAPESP: 2015/20380-8 FAPESP: 2017/05953-7 FAPESP: 2017/21097-3 FAPESP: 2018/20435-5 FAPESP: 2020/03527-3 |
| Databáze: | OpenAIRE |
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