The Origin and Ecology of a Likely Introduced Population of Black-bellied Salamander (Desmognathus quadramaculatus). Hutcheson, K. G. Ph.D. Thesis, University of Georgia, Athens, Georgia, USA, 2021. abstract bibtex Invasive species can pose threats to native species and are seen as a leading cause for global biodiversity declines. Introduced species can quickly become invasive species without early detection and monitoring, which can be done through phylogenetics and population modeling. In March of 2019, we discovered an isolated population of black-bellied salamanders (Desmognathus quadramaculatus) approximately 30 km southwest of their known range. We used sequencing of two mitochondrial genes to determine the origin of this newly discovered population. We then used a capture-mark-recapture survey to estimate the population size and a lavage study to contrast the introduced population’s diet to published studies of D. quadramaculatus within its native range within the Blue Ridge. The population estimate was 39 adults which seemed too high to be only surviving members of an introduction event, and we observed all life stages of the species (larvae, juveniles, and adults), suggesting that population is reproducing and likely recruiting at the site. We documented several prey items in D. quadramaculatus diets that were not reported in studies from the native range but have been reported in diets studies of smaller dusky species closely related to native species in the region. We hypothesize that this D. quadramaculatus population was likely introduced via the bait trade, has grown since introduction, and is consuming resources likely utilized by native salamanders. Given its small size, managers could consider removing the population, or the population could be used for research provided the site and nearby sites are monitored closely to limit the potential for spread. The apparent establishment of this population highlights the importance of monitoring the sale of live bait and promoting safe bait disposal to prevent introductions that could lead to invasive populations.
@phdthesis{hutcheson_origin_2021,
address = {Athens, Georgia, USA},
type = {Senior {Thesis}},
title = {The {Origin} and {Ecology} of a {Likely} {Introduced} {Population} of {Black}-bellied {Salamander} ({Desmognathus} quadramaculatus)},
abstract = {Invasive species can pose threats to native species and are seen as a leading cause for global biodiversity declines. Introduced species can quickly become invasive species without early detection and monitoring, which can be done through phylogenetics and population modeling. In March of 2019, we discovered an isolated population of black-bellied salamanders (Desmognathus quadramaculatus) approximately 30 km southwest of their known range. We used sequencing of two mitochondrial genes to determine the origin of this newly discovered population. We then used a capture-mark-recapture survey to estimate the population size and a lavage study to contrast the introduced population’s diet to published studies of D. quadramaculatus within its native range within the Blue Ridge. The population estimate was 39 adults which seemed too high to be only surviving members of an introduction event, and we observed all life stages of the species (larvae, juveniles, and adults), suggesting that population is reproducing and likely recruiting at the site. We documented several prey items in D. quadramaculatus diets that were not reported in studies from the native range but have been reported in diets studies of smaller dusky species closely related to native species in the region. We hypothesize that this D. quadramaculatus population was likely introduced via the bait trade, has grown since introduction, and is consuming resources likely utilized by native salamanders. Given its small size, managers could consider removing the population, or the population could be used for research provided the site and nearby sites are monitored closely to limit the potential for spread. The apparent establishment of this population highlights the importance of monitoring the sale of live bait and promoting safe bait disposal to prevent introductions that could lead to invasive populations.},
school = {University of Georgia},
author = {Hutcheson, Kevin G.},
year = {2021},
}
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We then used a capture-mark-recapture survey to estimate the population size and a lavage study to contrast the introduced population’s diet to published studies of D. quadramaculatus within its native range within the Blue Ridge. The population estimate was 39 adults which seemed too high to be only surviving members of an introduction event, and we observed all life stages of the species (larvae, juveniles, and adults), suggesting that population is reproducing and likely recruiting at the site. We documented several prey items in D. quadramaculatus diets that were not reported in studies from the native range but have been reported in diets studies of smaller dusky species closely related to native species in the region. We hypothesize that this D. quadramaculatus population was likely introduced via the bait trade, has grown since introduction, and is consuming resources likely utilized by native salamanders. Given its small size, managers could consider removing the population, or the population could be used for research provided the site and nearby sites are monitored closely to limit the potential for spread. The apparent establishment of this population highlights the importance of monitoring the sale of live bait and promoting safe bait disposal to prevent introductions that could lead to invasive populations.","school":"University of Georgia","author":[{"propositions":[],"lastnames":["Hutcheson"],"firstnames":["Kevin","G."],"suffixes":[]}],"year":"2021","bibtex":"@phdthesis{hutcheson_origin_2021,\n\taddress = {Athens, Georgia, USA},\n\ttype = {Senior {Thesis}},\n\ttitle = {The {Origin} and {Ecology} of a {Likely} {Introduced} {Population} of {Black}-bellied {Salamander} ({Desmognathus} quadramaculatus)},\n\tabstract = {Invasive species can pose threats to native species and are seen as a leading cause for global biodiversity declines. 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