Seasonal and plant specific vulnerability of amphibian tadpoles to the invasion of a novel cyanobacteria

John C. Maerz, Susan B. Wilde, Vanessa K. Terrell, Brigette Haram, R. Clay Trimmer, Chelsea Nunez, Erin Cork, Allan Pessier, Sue Lannoo, Michael J. Lannoo, Sara L. Diamond

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Aetokthonos hydrillicola (Ah) is a newly described cyanobacteria that forms dense colonies on aquatic macrophytes, primarily invasive Hydrilla verticillata, and is associated with mortality of freshwater wildlife. Prior research shows that Ah growing on Hydrilla is potently toxic to waterbirds, turtles, and fish, suggesting potentially broad sensitivity among vertebrates. We tested whether amphibian tadpole species were affected by ingestion of Ah-positive Hydrilla, and whether season, host plant, or tadpole age/size affected tadpole vulnerability. For trials involving ranid tadpoles (Bullfrogs, Rana catesbeiana; Green frogs, R. clamitans; and Southern leopard frogs, R. sphenocephala), feeding on Ah-positive Hydrilla collected during October–November resulted in the development of lesions within brain tissue and significant mortality. Ranid tadpole sensitivity to Ah toxin did not vary with age or size, but vulnerability from ingestion of Ah-positive Hydrilla varied seasonally and between two syntopic host plants. An unexpected result of our study was the apparent insensitivity of Green treefrog tadpoles (Hyla cinerea) fed toxic, Ah-positive Hydrilla. In conjunction with other studies, our results confirm wide but variable sensitivity among major vertebrate lineages to the Ah toxin. Differential sensitivity among species means that the introduction of Ah could alter interactions and structure within aquatic communities.

Original languageEnglish (US)
Pages (from-to)821-831
Number of pages11
JournalBiological Invasions
Issue number3
StatePublished - Mar 15 2019


  • Aetokthonos hydrillicola
  • Amphibian tadpole
  • Biological invasions
  • Cyanobacteria
  • Hydrilla verticillata
  • Najas guadalupensis
  • Vacuolar myelinopathy

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

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