Assessment of a Novel Cyanobacterium on Native Macrophytes and Toxicity Potential for Trophic Transfer to Aquatic Predators. Martin, M. K. Master's thesis, University of Georgia, Athens, Georgia, 2018. abstract bibtex Aetokthonos hydrillicola (Ah) is a novel cyanobacterium that grows on submerged, freshwater macrophytes. The primary substrate for Ah is invasive Hydrilla verticillata, and the co-occurrence of Ah on Hydrilla has been linked to neurological impairment and death of waterbirds, turtles, amphibians, and fish. In laboratory feeding trials, juvenile watersnakes became progressively anorectic, and paedomorphic mole salamanders were lethargic and unresponsive after consuming fish, snails, or tadpoles that fed on Ah-positive Hydrilla. Some watersnakes and salamanders developed intramyelinic vacuoles in the cervical spinal cord. Field surveys confirmed Ah-positive Hydrilla generally had higher toxin concentrations than the native macrophyte Najas guadalupensis; however, some Ah-positive N. guadalupensis samples did exhibit comparable levels of toxin production earlier in the season. These findings raise concerns for expanded wildlife mortality in natural environments through evidence for potential for the Ah toxin in the fall on other aquatic plant species, and higher trophic levels.
@mastersthesis{martin_assessment_2018,
address = {Athens, Georgia},
title = {Assessment of a {Novel} {Cyanobacterium} on {Native} {Macrophytes} and {Toxicity} {Potential} for {Trophic} {Transfer} to {Aquatic} {Predators}},
abstract = {Aetokthonos hydrillicola (Ah) is a novel cyanobacterium that grows on submerged, freshwater macrophytes. The primary substrate for Ah is invasive Hydrilla verticillata, and the co-occurrence of Ah on Hydrilla has been linked to neurological impairment and death of waterbirds, turtles, amphibians, and fish. In laboratory feeding trials, juvenile watersnakes became progressively anorectic, and paedomorphic mole salamanders were lethargic and unresponsive after consuming fish, snails, or tadpoles that fed on Ah-positive Hydrilla. Some watersnakes and salamanders developed intramyelinic vacuoles in the cervical spinal cord. Field surveys confirmed Ah-positive Hydrilla generally had higher toxin concentrations than the native macrophyte Najas guadalupensis; however, some Ah-positive N. guadalupensis samples did exhibit comparable levels of toxin production earlier in the season. These findings raise concerns for expanded wildlife mortality in natural environments through evidence for potential for the Ah toxin in the fall on other aquatic plant species, and higher trophic levels.},
language = {en},
school = {University of Georgia},
author = {Martin, Melissa Katherine},
year = {2018},
}
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