Repozitorij Univerze v Novi Gorici

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RAZMNOŽEVANJE TIGRASTEGA KOMARJA (Aedes albopictus) V NOVI GORICI
Urban Česnik, 2016, diplomsko delo

Opis: Goriška regija z Novo Gorico je zaradi milega podnebja in prehodne lege ugodno okolje za tujerodne vrste, tako rastlinske kot živalske. V zadnjih letih je invazivna vrsta tigrastega komarja (Aedes albopictus Skuse, 1894) na tem območju naselila areal, v katerem se nemoteno razmnožuje in vzdržuje stalno populacijo. V diplomskem delu smo se odločili spremljati letno dinamiko pojavljanja jajčec in ličink komarjev na različnih lokacijah mestnega, primestnega in gozdnega okolja. S preverjanjem prisotnosti ličink tigrastega komarja na različnih lokacijah smo poskušali dobiti odgovor na to, kje se nahajajo za to vrsto ugodni mikrohabitati. Rezultati so bili pridobljeni s pomočjo pasti, s katerimi smo spremljali številčnost ličink v okolju. Ob zaključku smo preverili še razmerje med številom ličink avtohtonih vrst komarjev in ličink tigrastega komarja. Dobljene vrednosti smo primerjali med seboj, ugotavljali dinamiko razmnoževanja in določali območja, ki jih ta vrsta v večjem številu naseljuje. Iz raziskave smo ugotovili, da tigrasti komar na tem območju naseljuje predvsem urbane habitate, manj pa je zastopan v gozdovih. Začetek pojavljanja prvih ličink smo zabeležili v drugi polovici maja, njihovo število je strmo naraščalo do julija, ko smo raziskavo tudi zaključili. Največje število ličink na vseh vzorčnih mestih je pripadalo tigrastemu komarju, manj pa je bilo avtohtonih vrst komarjev. Med preučevanimi potencialnimi razmnoževalnimi habitati smo daleč največjo številčnost ličink tigrastega komarja zaznali v peskolovih.
Najdeno v: osebi
Ključne besede: Nova Gorica, invazivne vrste, Aedes albopictus, ličinke tigrastega komarja, razmnoževanje, reprodukcijska dinamika
Objavljeno: 30.09.2016; Ogledov: 1338; Prenosov: 57
.pdf Polno besedilo (3,62 MB)

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Study of yeast biodiversity potential in the development of biological control agents against phytopathogenic fungi in viticulture
Lorena Butinar, Urban Česnik, Adesida Rowland, Melita Sternad Lemut, 2017, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: Despite public’s growing concerns for human health and environmental pollution, synthetic fungicides are still preferred and massively used for the protection of agricultural crop plants against fungal diseases. However, more and more research is focused on finding potential alternatives in the form of effective biological control agents. Although there are reports of yeast’s biocontrol activity, they are up to date poorly commercialized for such purposes. As the yeasts represent an important part of the grape microflora, competing with other microorganisms (including pathogens) for nutrients and space, we decided to examine the potential of autochthonous yeasts as "green" alternatives in fighting against phytopathogens such as Botrytis cinerea in viticulture. With this aim we tested biocontrol activity of various strains / species of indigenous wine yeasts that were isolated from the vineyard environment in Slovenia and cross-border Italy. The yeasts were tested for the presence of siderophores, hydrolytic enzymes (chitinase, β-glucosidase and β-glucanase) and sensitivity to fungicides (copper, iprodion, cyprodinil + fludioxonil combination). The tests of phytopathogenic fungi growth inhibition in the presence of antagonistic yeast were also performed. The double Petri dish test was used to verify the inhibition of conidia germination by the formation of antifungal volatile organic compounds (VOC), synthetized by the antagonistic yeasts. The presence of hydrolytic enzymes was confirmed in many wine yeasts, particularly in the strains of Hanseniaspora uvarum and Metschnikowia pulcherrima species and in some strains of the Pichia genus. Using a medium, based on natural diluted grape juice in a double Petri dish test, we found that yeasts of the Debaryomyces hansenii, Lachancea thermotolerans, P. kudriavzevii, Saccharomyces kudriavzevii, S. cerevisiae and Torulaspora delbrueckii species were able to inhibit the germination of fungal conidia at the expense of the VOC formation. However, none of the up to date tested yeasts formed siderophores. On the other hand, the yeasts were generally resistant to the tested fungicide concentrations, thus they could be used as potential biofungicides in the combination with chemical fungicides.
Najdeno v: osebi
Ključne besede: yeasts, biocontrol, Botrytis cinerea, viticulture
Objavljeno: 08.11.2017; Ogledov: 87; Prenosov: 0
.pdf Polno besedilo (10,33 MB)

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