Suckermouth armored catfishes (SACs; Loricariidae) have invaded waterbodies outside their native ... more Suckermouth armored catfishes (SACs; Loricariidae) have invaded waterbodies outside their native range globally. Population control methods, including removals and genetic biocontrols, may be enhanced through greater knowledge of sex discrimination, sex ratios, and potential sex bias among control methods. We investigated sexual dimorphism and population sex ratio for an invasive SAC population of Hypostomus sp. in the upper San Marcos River, Texas, USA as a means of advancing on‐going management of the population. Among 385 specimens obtained at random during a planned dewatering of a 100‐m reach of the river, the sex ratio was biased towards females (proportion of females = 0.60). Morphometric analyses of 105 females and 108 males based on a generalized boosted classification model (GBM) revealed elongated dorsal‐ and anal‐fins in males correctly classified sex for 83% of individuals (95% CI = 77–88%). Seven independent observers used results from the GBM to assign sex to 30 fish ...
En el sudeste de los Estados Unidos habitan alrededor de 50 especies de serpientes (seis de las c... more En el sudeste de los Estados Unidos habitan alrededor de 50 especies de serpientes (seis de las cuales son venenosas) que viven en los estados costeros del Atlántico y el Golfo, desde Luisiana hasta Carolina del Norte. Estas serpientes utilizan una variedad de hábitats desde tierras altas hasta humedales, y tienen un gran impacto en la ecología de la región. Son depredadores, pero también presas y forman conexiones importantes en las redes tróficas.
WEC292, a 5-page illustrated fact sheet by Steve Johnson and Monica McGarrity, familiarizes train... more WEC292, a 5-page illustrated fact sheet by Steve Johnson and Monica McGarrity, familiarizes trainers with the REDDy program and provides the resources necessary for presenting the course concept and basic instructions to potential trainees and answering their questions. Published by the UF Department of Wildlife Ecology and Conservation, August 2010.
WEC287, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Flo... more WEC287, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Florida Invaders series. It provides key information and illustrations for identifying and reporting sightings of this large nocturnal predator that is native to sub-Saharan Africa but may be breeding in Florida. Published by the UF Department of Wildlife Ecology and Conservation, September 2010.
WEC293, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this nat... more WEC293, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this native to sub-Saharan Africa with isolated populations in Broward and Miami-Dade Counties, and provides information on how to identify them and report sightings. Published by the UF Department of Wildlife Ecology and Conservation, September 2010.
WEC294, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this nat... more WEC294, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this native to southeastern Asia, which has been found in the wild but is not established in Florida, and explains how to identify and report sightings. Published by the UF Department of Wildlife Ecology and Conservation, August 2010.
WEC288, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Flo... more WEC288, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Florida Invaders series. It provides key information and illustrations for identifying and reporting sightings of this large nocturnal predator that is native to Southeast Asia and is now established and breeding in Florida and Puerto Rico. Published by the UF Department of Wildlife Ecology and Conservation, September 2010.
WEC-263, a 3-page illustrated fact sheet by Monica E. McGarrity and Steve A. Johnson, provides si... more WEC-263, a 3-page illustrated fact sheet by Monica E. McGarrity and Steve A. Johnson, provides simple instructions for children to make, decorate and monitor a treefrog house. Published by the UF Department of Wildlife Ecology and Conservation, June 2009. WEC263/UW308: How To Make a Treefrog House (ufl.edu)
Do you know how to tell the difference between a dangerous Cane Toad (a.k.a. “Bufo” Toad or Marin... more Do you know how to tell the difference between a dangerous Cane Toad (a.k.a. “Bufo” Toad or Marine Toad) and a harmless native toad? This 2-page fact sheet will help you correctly identify and humanely euthanize this invasive toad that can kill pets. It was written by Steve Johnson and Monica McGarrity and published by the UF Department of Wildlife Ecology and Conservation, November 2010. 2010 PDF version unavailable, 2014 version included instead.
WEC-267, a 7-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this la... more WEC-267, a 7-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this larger black-necked relative of Florida’s native ibises — species description, similar species, native range and habitats, mode of introduction, introduced range and habitats, ecology, ecological impacts, impacts on people and pets, solutions, and how you can help. Includes references. Published by the UF Department of Wildlife Ecology and Conservation, October 2009.
Suckermouth armored catfishes (SACs; Loricariidae) have invaded waterbodies outside their native ... more Suckermouth armored catfishes (SACs; Loricariidae) have invaded waterbodies outside their native range globally. Population control methods, including removals and genetic biocontrols, may be enhanced through greater knowledge of sex discrimination, sex ratios, and potential sex bias among control methods. We investigated sexual dimorphism and population sex ratio for an invasive SAC population of Hypostomus sp. in the upper San Marcos River, Texas, USA as a means of advancing on‐going management of the population. Among 385 specimens obtained at random during a planned dewatering of a 100‐m reach of the river, the sex ratio was biased towards females (proportion of females = 0.60). Morphometric analyses of 105 females and 108 males based on a generalized boosted classification model (GBM) revealed elongated dorsal‐ and anal‐fins in males correctly classified sex for 83% of individuals (95% CI = 77–88%). Seven independent observers used results from the GBM to assign sex to 30 fish ...
En el sudeste de los Estados Unidos habitan alrededor de 50 especies de serpientes (seis de las c... more En el sudeste de los Estados Unidos habitan alrededor de 50 especies de serpientes (seis de las cuales son venenosas) que viven en los estados costeros del Atlántico y el Golfo, desde Luisiana hasta Carolina del Norte. Estas serpientes utilizan una variedad de hábitats desde tierras altas hasta humedales, y tienen un gran impacto en la ecología de la región. Son depredadores, pero también presas y forman conexiones importantes en las redes tróficas.
WEC292, a 5-page illustrated fact sheet by Steve Johnson and Monica McGarrity, familiarizes train... more WEC292, a 5-page illustrated fact sheet by Steve Johnson and Monica McGarrity, familiarizes trainers with the REDDy program and provides the resources necessary for presenting the course concept and basic instructions to potential trainees and answering their questions. Published by the UF Department of Wildlife Ecology and Conservation, August 2010.
WEC287, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Flo... more WEC287, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Florida Invaders series. It provides key information and illustrations for identifying and reporting sightings of this large nocturnal predator that is native to sub-Saharan Africa but may be breeding in Florida. Published by the UF Department of Wildlife Ecology and Conservation, September 2010.
WEC293, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this nat... more WEC293, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this native to sub-Saharan Africa with isolated populations in Broward and Miami-Dade Counties, and provides information on how to identify them and report sightings. Published by the UF Department of Wildlife Ecology and Conservation, September 2010.
WEC294, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this nat... more WEC294, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this native to southeastern Asia, which has been found in the wild but is not established in Florida, and explains how to identify and report sightings. Published by the UF Department of Wildlife Ecology and Conservation, August 2010.
WEC288, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Flo... more WEC288, a 2-page illustrated fact sheet by Steve Johnson and Monica McGarrity, is part of the Florida Invaders series. It provides key information and illustrations for identifying and reporting sightings of this large nocturnal predator that is native to Southeast Asia and is now established and breeding in Florida and Puerto Rico. Published by the UF Department of Wildlife Ecology and Conservation, September 2010.
WEC-263, a 3-page illustrated fact sheet by Monica E. McGarrity and Steve A. Johnson, provides si... more WEC-263, a 3-page illustrated fact sheet by Monica E. McGarrity and Steve A. Johnson, provides simple instructions for children to make, decorate and monitor a treefrog house. Published by the UF Department of Wildlife Ecology and Conservation, June 2009. WEC263/UW308: How To Make a Treefrog House (ufl.edu)
Do you know how to tell the difference between a dangerous Cane Toad (a.k.a. “Bufo” Toad or Marin... more Do you know how to tell the difference between a dangerous Cane Toad (a.k.a. “Bufo” Toad or Marine Toad) and a harmless native toad? This 2-page fact sheet will help you correctly identify and humanely euthanize this invasive toad that can kill pets. It was written by Steve Johnson and Monica McGarrity and published by the UF Department of Wildlife Ecology and Conservation, November 2010. 2010 PDF version unavailable, 2014 version included instead.
WEC-267, a 7-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this la... more WEC-267, a 7-page illustrated fact sheet by Steve Johnson and Monica McGarrity, describes this larger black-necked relative of Florida’s native ibises — species description, similar species, native range and habitats, mode of introduction, introduced range and habitats, ecology, ecological impacts, impacts on people and pets, solutions, and how you can help. Includes references. Published by the UF Department of Wildlife Ecology and Conservation, October 2009.
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