Alteration of Predatory Behavior of a Generalist Predator by Exposure to Two Insecticides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F17%3A43912720" target="_blank" >RIV/62156489:43410/17:43912720 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.isbca-2017.org/download/ISBCA-Proceedings.web.pdf" target="_blank" >http://www.isbca-2017.org/download/ISBCA-Proceedings.web.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Alteration of Predatory Behavior of a Generalist Predator by Exposure to Two Insecticides

Popis výsledku v původním jazyce

Predation pressure exerted by spiders on pests depends on their prey choice as well as predatory activity. However, both traits can be altered by exposure to pesticides. Possible influence of pesticides on the predatory activity of spiders is known for quite a few preparations and the predatory activity can be decreased as well as increased. However, the effects of pesticides on prey choice of natural enemies have not been studied yet. The prey choice in euryphagous spiders might be altered either by the blurred cognitive abilities or by increased voracity, which are sometimes connected to lower prey choosiness in euryphagous spiders. Here we tested the effect of two insecticides, SpinTor(R) (a.i. spinosad) and Integro(R) (a.i. methoxyfenozide), on the predatory activity and prey choice of spider Philodromus cespitum (Araneae: Philodromidae). We investigated the prey choice of P. cespitum between the pest Cacopsylla pyri (Hemiptera: Psyllidae) and spiders Theridion sp. (Araneae: Theridiidae). We evaluated the predatory activity as overall number of killed prey for both prey types. We found that the philodromids in control treatment significantly preferred theridiids to psylla while the philodromids in both pesticide treatments did not show any distinct prey preferences. Although SpinTor has been shown to decrease the predatory activity of philodromids in previous studies, both pesticide treatments increased the predatory activity of philodromids in comparison to the control in this study. The results show that the application of pesticides can disrupt the natural ecological dynamics of predator-prey interactions, not only due to the changed predátory activity but also due to the altered prey choice.

Název v anglickém jazyce

Alteration of Predatory Behavior of a Generalist Predator by Exposure to Two Insecticides

Popis výsledku anglicky

Predation pressure exerted by spiders on pests depends on their prey choice as well as predatory activity. However, both traits can be altered by exposure to pesticides. Possible influence of pesticides on the predatory activity of spiders is known for quite a few preparations and the predatory activity can be decreased as well as increased. However, the effects of pesticides on prey choice of natural enemies have not been studied yet. The prey choice in euryphagous spiders might be altered either by the blurred cognitive abilities or by increased voracity, which are sometimes connected to lower prey choosiness in euryphagous spiders. Here we tested the effect of two insecticides, SpinTor(R) (a.i. spinosad) and Integro(R) (a.i. methoxyfenozide), on the predatory activity and prey choice of spider Philodromus cespitum (Araneae: Philodromidae). We investigated the prey choice of P. cespitum between the pest Cacopsylla pyri (Hemiptera: Psyllidae) and spiders Theridion sp. (Araneae: Theridiidae). We evaluated the predatory activity as overall number of killed prey for both prey types. We found that the philodromids in control treatment significantly preferred theridiids to psylla while the philodromids in both pesticide treatments did not show any distinct prey preferences. Although SpinTor has been shown to decrease the predatory activity of philodromids in previous studies, both pesticide treatments increased the predatory activity of philodromids in comparison to the control in this study. The results show that the application of pesticides can disrupt the natural ecological dynamics of predator-prey interactions, not only due to the changed predátory activity but also due to the altered prey choice.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

40102 - Forestry

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 5th International Symposium on Biological Control of Arthropods

ISBN

978-1-78639-411-8

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

302-303

Název nakladatele

CABI Publishing

Místo vydání

Wallingford

Místo konání akce

Langkawi

Datum konání akce

11. 9. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000461868100099