Behavioral manipulation of the spider Macrophyes pacoti (Araneae: Anyphaenidae) by the araneopathogenic fungus Gibellula sp. (Hypocreales: Cordycipitaceae).

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From: Canadian Journal of Zoology(Vol. 99, Issue 5)
Publisher: NRC Research Press
Document Type: Report
Length: 5,548 words
Lexile Measure: 1500L

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Abstract :

Host manipulation has already been documented in several distinct host-parasite associations, covering all major phyla of living organisms. While in animals we know that several species have the ability to manipulate their hosts for the benefit of the parasite, in arthropopathogenic fungi there is very little knowledge about possible behavioral manipulation. We report for the first time the interaction between the araneopathogenic fungus genus Gibellula Cavara and the spider Macrophyes pacoti Brescovit, Oliveira, Sobczak and Sobczak, 2019 (Anyphaenidae) in addition to investigating the potential change in behavior of spiders infected by the parasitic fungus. We also investigated whether the rainfall regime influences the abundance of infected spiders and the parasitism rate by the araneopathogenic fungus. Our results corroborated our hypothesis that the fungus induces vertical segregation in the spider population, inducing infected spiders to be at higher heights than uninfected ones. Dead infected spiders were found in a stretched position that probably helps in fixing the carcass on the leaves by increasing the contact surface between the host and the substrate. Our results also confirm the positive relationship between the rainy season and the greater number of parasitized spiders and the parasitism rate. Key words: host manipulation, entomopathogenic fungi, Baturite Massif, ghost spider, Macrophyes pacoti, Gibellula. La manipulation d'hotes a deja ete documentee au sein de plusieurs associations hote-parasite differentes, dans tous les principaux phylums d'organismes vivants. Si nous savons que, chez les animaux, plusieurs parasites ont la capacite de manipuler leurs hotes a leur avantage, les connaissances sur une eventuelle manipulation du comportement par les champignons arthropopathogenes sont tres limitees. Nous faisons etat, pour la premiere fois, de l'interaction entre le genre champignon araneopathogene Gibellula Cavara et l'araignee Macrophyes pacoti Brescovit, Oliveira, Sobczak et Sobczak, 2019 (anyphenides), en plus d'examiner un possible changement de comportement d'araignees infectees par le champignon parasite. Nous examinons egalement si le regime pluviometrique influence l'abondance d'araignees infectees et le taux de parasitisme par le champignon araneopathogene. Nos resultats appuient notre hypothese voulant que le champignon induise une segregation verticale au sein de la population d'araignees en poussant les araignees infectees a de plus grandes hauteurs que les araignees non infectees. Des araignees infectees mortes ont ete trouvees dans une position etendue qui aide probablement a fixer leur carcasse sur les feuilles en accroissant la surface de contact de l'hote et du substrat. Nos resultats confirment egalement une relation positive entre la saison des pluies et un plus grand nombre d'araignees parasitees et un taux plus eleve de parasitisme. [Traduit par la Redaction] Mots-cles : manipulation de l'hote, champignon entomopathogene, massif de Baturite, araignee fantome, Macrophyes pacoti, Gibellula.

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Gale Document Number: GALE|A666204562