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Title:
VPLIV SPOR NOSEMA IN PESTICIDA 'THIAMETHOXAM' NA DOLGOŽIVOST ČEBEL
Authors:
ID
Kramberger, Doris
(Author)
ID
Gregorc, Aleš
(Mentor)
More about this mentor...
Files:
MAG_Kramberger_Doris_2015.pdf
(1,47 MB)
MD5: 03DB7AD732A1556FF7D9EFBE1382E619
Language:
Slovenian
Work type:
Master's thesis/paper
Organization:
FKBV - Faculty of Agriculture and Life Sciences
Abstract:
V letu 2014 smo na Kmetijskem inštitutu Slovenije ugotavljali vpliv spor noseme in pesticida tiametoksam na dolgoživost čebel. V nalogi smo uporabili medonosno čebelo Apis mellifera carnica. Ugotavljali smo akutno toksičnost pesticida različnih koncentracij v 24, 48 in 72 urah. Pridobljeni podatki v tej študiji kažejo, da je LD50 za kranjsko čebelo 7,86 ng tiametoksama/čebelo in večina teh umre v 24 urah. Med 24 in 48 urami se smrtnost občutno zmanjša oz. se preživetje čebel opazno poveča, če zmanjšamo koncentracijo. Biološki in imunohistološki poskus opravljen v laboratorijskih pogojih je pokazal, da nobeden od realnih odmerkov pesticida tiametoksam (0,0856 ng/čebelo in 0,00856 ng/čebelo), ki bi se lahko pojavil v naravnem okolju, ne poveča stopnje umrljivosti kranjske čebele, niti pri čebelah, hkrati izpostavljenih okužbi z N. ceranae in tiametoksamom. Z uporabo tehnik TUNEL smo ocenjevali histološke značilnosti tkiva. Histološka analiza je pokazala hipertrofično širitev okužbe prebavnih celic in obsežno sprostitev okuženih celic v lumen, opaženih v glavnem 10 dni po okužbi. V poznejši fazi okužbe je bila zmanjšana obnova celic in njihova funkcija, kar smo opazili 20. dan po infekciji v ventrikulih okuženih čebel z nosemo. Kranjska čebela ob hkratni izpostavitvi sporam noseme in insekticidu tiametoksam ni kazala povezave v krepitvi virulentnosti N. ceranae.
Keywords:
spore noseme
,
tiametoksam
,
neonikotinoidi
,
celična smrt
,
dolgoživost čebel
Place of publishing:
Maribor
Year of publishing:
2015
PID:
20.500.12556/DKUM-48158
NUK URN:
URN:SI:UM:DK:XAM9KHBT
Publication date in DKUM:
03.06.2015
Views:
2543
Downloads:
163
Metadata:
Categories:
FKBV
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:
KRAMBERGER, Doris, 2015,
VPLIV SPOR NOSEMA IN PESTICIDA “THIAMETHOXAM” NA DOLGOŽIVOST ČEBEL
[online]. Master’s thesis. Maribor. [Accessed 2 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=48158
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Secondary language
Language:
English
Title:
INFLUENCE OF NOSEMA SPORES AND THIAMETHOXAM PESTICIDE ON BEE'S LIFESPAN
Abstract:
In the thesis we studied the influence of nosema spores and thiametoxam pesticide on the bee's lifespan. The experiment took place in the Agricultural Institute of Slovenia in 2014. The aim of our study was to define the acute toxicity of the pesticide in different concentrations in 24, 48 and 72 hours, and its influence on the honeybee Apis mellifera carnica. The collected data show that LD50 for the specified bee is 7,68 ng of thiametoxam per bee and most of them die in 24 hours. Between 24 and 48 hours the mortality rate drasticly lowers. Lowering the concentration of the pesticide also increases bee's survival. Immunohistological experiment, under laboratory conditions, negates the possibility that real life dose of thiametoxam (0,0856 ng/bee in 0,00856 ng/bee), which could appear in the natural habitat, would increase bee's mortality. Neither in case of bee's being infected with N. Ceranae and simultaneously exposed to thiametoxam.We evaluated histological features of the tissue with TUNEL technique. Histological analysis showed hypertrophic spread of infection in digestive cells, and an extensive spread further into the lumen. This was observed for 10 days after infection. In later stages of infection we observed reduced cell recovery and functional abilities. This was the most obvious in the bee's ventriculars after 20 days after infection with nosema. Simultaneous exposure of Apis mellifera carnica to nosema spores and thiametoxam did not show any strengthening of the virulence of N. ceranae.
Keywords:
Nosema spores
,
Thiamethoxam
,
neonicotinoids
,
cell death
,
longevity of bees
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