Results 101 to 110 of about 172 (121)
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Neotropical Entomology, 2020
Bombus atratus Franklin is a widely distributed bumblebee of South America. In Colombia, this species is recognized for its ability to adapt to highly disturbed habitats. However, knowledge of its ecology is poorly known, in particular conditions to ensure the long-term conservation of its populations. Identification of pollen resources is an important
D Riaño-Jiménez
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Bombus atratus Franklin is a widely distributed bumblebee of South America. In Colombia, this species is recognized for its ability to adapt to highly disturbed habitats. However, knowledge of its ecology is poorly known, in particular conditions to ensure the long-term conservation of its populations. Identification of pollen resources is an important
D Riaño-Jiménez
exaly +3 more sources
Insectes Sociaux, 1998
Bombus atratus, a bumble bee found throughout much of South America, undergoes periods of polygyny during its colony cycle, which is often perennial. This temporary polygynous phase persists as multiple queens compete fiercely to become the sole reproductive. The outcome of these battles is death or expulsion from the nest of all but one of the queens,
S. A. Cameron, M. C. Jost
exaly +2 more sources
Bombus atratus, a bumble bee found throughout much of South America, undergoes periods of polygyny during its colony cycle, which is often perennial. This temporary polygynous phase persists as multiple queens compete fiercely to become the sole reproductive. The outcome of these battles is death or expulsion from the nest of all but one of the queens,
S. A. Cameron, M. C. Jost
exaly +2 more sources
Nest architecture and brood development in a neotropical bumblebee,Bombus atratus
Insectes Sociaux, 1967Shōichi F Sakagami
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Chemosphere, 2021
Although mercury neurotoxic effects are well known in several species, it is poorly studied in bees. Mercury contamination is increasing in several regions of the Brazilian Amazon Rainforest due to illegal and indiscriminate gold mining. Therefore, this study aimed to evaluate the effects of mercury (Hg) in brain Kenyon cells of foraging workers of ...
Michele Provase +3 more
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Although mercury neurotoxic effects are well known in several species, it is poorly studied in bees. Mercury contamination is increasing in several regions of the Brazilian Amazon Rainforest due to illegal and indiscriminate gold mining. Therefore, this study aimed to evaluate the effects of mercury (Hg) in brain Kenyon cells of foraging workers of ...
Michele Provase +3 more
openaire +2 more sources
Observations on the development of queenless colonies ofBombus atratus(Hymenoptera, Apidae)
Journal of Apicultural Research, 1995SUMMARYIn two queenless colonies of Bombus atratus maintained in the laboratory, the largest worker present became the dominant female (false queen) which mated and produced female offspring. In both colonies the frequency of oviposition increased with colony development, not only because of shorter intervals between egg laying by the false queens, but
E V Silva Matos, C A Garofalo
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Structure of the cocoon of the neotropical bumblebee Bombus atratus Franklin
Canadian Journal of Zoology, 1982The cocoon of Bombus atratus was studied using cytochemical methods and polarization microscopy. The aims were to investigate the components of the cocoon and to establish their stereoarrangement in the cocoon wall. Filamentous layers assumed to be composed of the structural proteins produced by the silk glands appear to make up the framework of the ...
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Environmental Toxicology and Pharmacology
Fipronil (FP) is an insecticide used in the treatment and control of pests, but it also adversely affects bees. Currently, there is no data on the genotoxic effects of FP in the brain of bumblebees. Thus, through the comet assay and routine morphological analysis, we analyzed the morphological effects and potential genotoxicity of environmentally ...
Michele, Provase +4 more
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Fipronil (FP) is an insecticide used in the treatment and control of pests, but it also adversely affects bees. Currently, there is no data on the genotoxic effects of FP in the brain of bumblebees. Thus, through the comet assay and routine morphological analysis, we analyzed the morphological effects and potential genotoxicity of environmentally ...
Michele, Provase +4 more
openaire +2 more sources
Environmental Toxicology and Pharmacology
While bumblebees may be exposed to microplastics (MPs), the effects on them are not well studied. Therefore, in this research, we assessed the cytotoxicity of pristine and photodegraded spray paint-derived MPs on the midgut, Malpighian tubules, and hepato-nephrocitic system cells of Bombus atratus workers exposed to 50 mg.L-1 MPs for 96 hours ...
Guilherme Andrade Neto Schmitz, Boeing +5 more
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While bumblebees may be exposed to microplastics (MPs), the effects on them are not well studied. Therefore, in this research, we assessed the cytotoxicity of pristine and photodegraded spray paint-derived MPs on the midgut, Malpighian tubules, and hepato-nephrocitic system cells of Bombus atratus workers exposed to 50 mg.L-1 MPs for 96 hours ...
Guilherme Andrade Neto Schmitz, Boeing +5 more
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Palynological analysis of food reserves found in a nest of Bombus atratus (Hym. Apidae)
Grana, 1998The pollen present in food reserves, pollen masses and honey, stored in an aerial nest of Bombus atratus was investigated. Field observations were also made. 23 pollen morphological types, belonging to 16 families of plants, were identified. The principal sources of nectar were: Eucalyptus spp., Aptenia cordifolia, Lagerstroemia indica and Salvia ...
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Environmental Toxicology and Pharmacology
Eusocial bees are declining due to anthropogenic actions. Individuals can be exposed to contaminants like Cd, which have been found in pollen. Thus, we evaluated the potential genotoxicity of Cd to the hepato-nephrocitic system of Bombus atratus foraging workers exposed to environmentally safe doses of Cd (0.001 mg/kg and 0.003 mg/kg) during 72 h.
Guilherme Andrade Neto Schmitz Boeing +4 more
openaire +2 more sources
Eusocial bees are declining due to anthropogenic actions. Individuals can be exposed to contaminants like Cd, which have been found in pollen. Thus, we evaluated the potential genotoxicity of Cd to the hepato-nephrocitic system of Bombus atratus foraging workers exposed to environmentally safe doses of Cd (0.001 mg/kg and 0.003 mg/kg) during 72 h.
Guilherme Andrade Neto Schmitz Boeing +4 more
openaire +2 more sources