Disease dynamics of red-spotted newts and their anuran prey in a montane pond community

Diseases of Aquatic Organisms
Betsie B RothermelMichael J Yabsley

Abstract

Long-term monitoring of amphibians is needed to clarify population-level effects of ranaviruses (Rv) and the fungal pathogen Batrachochytrium dendrobatidis (Bd). We investigated disease dynamics of co-occurring amphibian species and potential demographic consequences of Rv and Bd infections at a montane site in the Southern Appalachians, Georgia, USA. Our 3-yr study was unique in combining disease surveillance with intensive population monitoring at a site where both pathogens are present. We detected sub-clinical Bd infections in larval and adult red-spotted newts Notophthalmus viridescens viridescens, but found no effect of Bd on body condition of adult newts. Bd infections also occurred in larvae of 5 anuran species that bred in our fishless study pond, and we detected co-infections with Bd and Rv in adult newts and larval green frogs Lithobates clamitans. However, all mortality and clinical signs in adult newts and larval anurans were most consistent with ranaviral disease, including a die-off of larval wood frogs Lithobates sylvaticus in small fish ponds located near our main study pond. During 2 yr of drift fence monitoring, we documented high juvenile production in newts, green frogs and American bullfrogs L. catesbeianu...Continue Reading

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Citations

Feb 28, 2017·Scientific Reports·Gonçalo M RosaJaime Bosch
Feb 13, 2018·Ecological Applications : a Publication of the Ecological Society of America·Brittany A MosherKathryn P Huyvaert
Sep 7, 2019·The Journal of Experimental Biology·Matthew J RobakCorinne L Richards-Zawacki
Jun 5, 2021·Parasites & Vectors·Dávid HerczegAttila Hettyey

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