Science and Technology Production
Article
Authorship
FRAYSSE, CINTIA PAMELA
;
BOY, CLAUDIA CLEMENTINA
;
VEYÑ, MARIANELA
;
Farias, Ayelen
;
PEREZ, ANALIA FERNANDA
Date
2024
Publishing House and Editing Place
REVISTA DE BIOLOGIA TROPICAL
Magazine
REVISTA DE BIOLOGÃA TROPICAL,
vol. 72
(pp. 1-13)
REVISTA DE BIOLOGIA TROPICAL
Summary
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Introduction: The endoparasite Dendrogaster argentinensis infects the intertidal brooder sea star Anasteriasantarctica. This sea-star species is in the highest trophic level in the Beagle Channel.Objective: To study the effects of parasitism by D. argentinensis on the fitness and reproduction of A. antarctica.Methods: Adults from the brooder sea-star were collected from the rocky intertidal of Ensenada Zaratiegui bay(54°51’ S & 68°29’ W), Argentina. Eight seasonal sampli...
Introduction: The endoparasite Dendrogaster argentinensis infects the intertidal brooder sea star Anasteriasantarctica. This sea-star species is in the highest trophic level in the Beagle Channel.Objective: To study the effects of parasitism by D. argentinensis on the fitness and reproduction of A. antarctica.Methods: Adults from the brooder sea-star were collected from the rocky intertidal of Ensenada Zaratiegui bay(54°51’ S & 68°29’ W), Argentina. Eight seasonal samplings were performed (four seasons in two years) in theupper and low intertidal. During dissection, parasites were removed, and all organs were extracted and weighedseparately.Results: Dendrogaster argentinensis prevalence was the highest for the region (20.4 %). Parasitized individualswere more frequent in the low intertidal in all seasons, with a higher difference in summer, where it is likely thatthe higher temperatures and strong winds could make the upper intertidal more challenging for a parasitizedindividual. Five parasitized individuals were castrated. Generally, the gonadal (GI) and somatic (pyloric caeca,PCI; stomach, SI; body wall, WI) indexes were lower in parasitized than non-parasitized individuals.Conclusions: Parasitism by D. argentinensis negatively affects A. antarctica condition. It affects reproductionbecause it reduces the GI, and can also produce castration. The parasite competes for the sea-stars’ energetic resources, also decreasing the individual’s capacity for feeding (reduced stomach) and growth (reducedbody wall).
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Key Words
GONADAL INDEXPARASITEPARASITEBEAGLE CHANNELASCOTHORACIDAPREVALENCEASTEROIDEASOMATIC INDEXES
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