Modeling Anuran Site Occupancy of Stormwater Basins Versus Natural Wetlands in the Georgia Piedmont. Abouhamdan, A. Ph.D. Thesis, University of Georgia, Athens, Georgia, USA, 2016. abstract bibtex Stormwater basins are ubiquitous features of urbanized landscapes of the southeastern United States. As natural wetlands are lost or altered by development, stormwater basins may provide suitable habitat for amphibians. I performed call surveys at 23 sites (11 natural wetlands and 12 stormwater basins) bi-monthly from March to July 2015. Nine of fourteen detected species had sufficient numbers of detections among sties to be modeled. I used robust call survey data to examine colonization patterns directly related to occupancy of these nine anuran species among stormwater basins and natural wetlands within a developing landscape within the Georgia Piedmont. Waterbody type affected colonization of only two species, Green Frog (Lithobates clamitus) and Spring Peeper (Pseudacris crucifer). Three species generally associated with more permanent water had a best-fit model including the effect of permanence (hydroperiod) on colonization: Northern Cricket Frog (Acris crepitans), Bullfrog (Lithobates catesbeianus), and Green Treefrog (Hyla cinerea). Four of the nine analyzed species had a null model including no covariates as their best-fit model. These results suggest that stormwater basins and natural waterbodies might be similarly attractive to many anuran species, or the presence of stormwater basins in proximity to natural wetlands is homogenizing anuran species across sites irrespective of differences in hydroperiod. I caution that colonization/occupancy studies using calling anurans may not be the best indicator of habitat suitability. Multi-annual tadpole species (e.g., Bullfrogs) are unlikely to reproduce successfully in natural wetlands that dry annually, and species adapted to natural wetlands may be attracted to more permanent stormwater ponds where their tadpoles are exposed to aquatic competitors and predators. Future research needs to determine whether stormwater basins may be creating ecological traps for some amphibian species in developing landscapes.
@phdthesis{abouhamdan_modeling_2016,
address = {Athens, Georgia, USA},
type = {Senior {Thesis}},
title = {Modeling {Anuran} {Site} {Occupancy} of {Stormwater} {Basins} {Versus} {Natural} {Wetlands} in the {Georgia} {Piedmont}},
abstract = {Stormwater basins are ubiquitous features of urbanized landscapes of the southeastern United States. As natural wetlands are lost or altered by development, stormwater basins may provide suitable habitat for amphibians. I performed call surveys at 23 sites (11 natural wetlands and 12 stormwater basins) bi-monthly from March to July 2015. Nine of fourteen detected species had sufficient numbers of detections among sties to be modeled. I used robust call survey data to examine colonization patterns directly related to occupancy of these nine anuran species among stormwater basins and natural wetlands within a developing landscape within the Georgia Piedmont. Waterbody type affected colonization of only two species, Green Frog (Lithobates clamitus) and Spring Peeper (Pseudacris crucifer). Three species generally associated with more permanent water had a best-fit model including the effect of permanence (hydroperiod) on colonization: Northern Cricket Frog (Acris crepitans), Bullfrog (Lithobates catesbeianus), and Green Treefrog (Hyla cinerea). Four of the nine analyzed species had a null model including no covariates as their best-fit model. These results suggest that stormwater basins and natural waterbodies might be similarly attractive to many anuran species, or the presence of stormwater basins in proximity to natural wetlands is homogenizing anuran species across sites irrespective of differences in hydroperiod. I caution that colonization/occupancy studies using calling anurans may not be the best indicator of habitat suitability. Multi-annual tadpole species (e.g., Bullfrogs) are unlikely to reproduce successfully in natural wetlands that dry annually, and species adapted to natural wetlands may be attracted to more permanent stormwater ponds where their tadpoles are exposed to aquatic competitors and predators. Future research needs to determine whether stormwater basins may be creating ecological traps for some amphibian species in developing landscapes.},
language = {en},
school = {University of Georgia},
author = {Abouhamdan, Abbie},
year = {2016},
}
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I used robust call survey data to examine colonization patterns directly related to occupancy of these nine anuran species among stormwater basins and natural wetlands within a developing landscape within the Georgia Piedmont. Waterbody type affected colonization of only two species, Green Frog (Lithobates clamitus) and Spring Peeper (Pseudacris crucifer). Three species generally associated with more permanent water had a best-fit model including the effect of permanence (hydroperiod) on colonization: Northern Cricket Frog (Acris crepitans), Bullfrog (Lithobates catesbeianus), and Green Treefrog (Hyla cinerea). Four of the nine analyzed species had a null model including no covariates as their best-fit model. These results suggest that stormwater basins and natural waterbodies might be similarly attractive to many anuran species, or the presence of stormwater basins in proximity to natural wetlands is homogenizing anuran species across sites irrespective of differences in hydroperiod. I caution that colonization/occupancy studies using calling anurans may not be the best indicator of habitat suitability. Multi-annual tadpole species (e.g., Bullfrogs) are unlikely to reproduce successfully in natural wetlands that dry annually, and species adapted to natural wetlands may be attracted to more permanent stormwater ponds where their tadpoles are exposed to aquatic competitors and predators. Future research needs to determine whether stormwater basins may be creating ecological traps for some amphibian species in developing landscapes.","language":"en","school":"University of Georgia","author":[{"propositions":[],"lastnames":["Abouhamdan"],"firstnames":["Abbie"],"suffixes":[]}],"year":"2016","bibtex":"@phdthesis{abouhamdan_modeling_2016,\n\taddress = {Athens, Georgia, USA},\n\ttype = {Senior {Thesis}},\n\ttitle = {Modeling {Anuran} {Site} {Occupancy} of {Stormwater} {Basins} {Versus} {Natural} {Wetlands} in the {Georgia} {Piedmont}},\n\tabstract = {Stormwater basins are ubiquitous features of urbanized landscapes of the southeastern United States. As natural wetlands are lost or altered by development, stormwater basins may provide suitable habitat for amphibians. I performed call surveys at 23 sites (11 natural wetlands and 12 stormwater basins) bi-monthly from March to July 2015. Nine of fourteen detected species had sufficient numbers of detections among sties to be modeled. I used robust call survey data to examine colonization patterns directly related to occupancy of these nine anuran species among stormwater basins and natural wetlands within a developing landscape within the Georgia Piedmont. Waterbody type affected colonization of only two species, Green Frog (Lithobates clamitus) and Spring Peeper (Pseudacris crucifer). Three species generally associated with more permanent water had a best-fit model including the effect of permanence (hydroperiod) on colonization: Northern Cricket Frog (Acris crepitans), Bullfrog (Lithobates catesbeianus), and Green Treefrog (Hyla cinerea). Four of the nine analyzed species had a null model including no covariates as their best-fit model. These results suggest that stormwater basins and natural waterbodies might be similarly attractive to many anuran species, or the presence of stormwater basins in proximity to natural wetlands is homogenizing anuran species across sites irrespective of differences in hydroperiod. I caution that colonization/occupancy studies using calling anurans may not be the best indicator of habitat suitability. Multi-annual tadpole species (e.g., Bullfrogs) are unlikely to reproduce successfully in natural wetlands that dry annually, and species adapted to natural wetlands may be attracted to more permanent stormwater ponds where their tadpoles are exposed to aquatic competitors and predators. 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