Current Search:   Campbell, Ashley B. (x)

View All Items

  • CSV Spreadsheet
(1 - 3 of 3)
Behavioral and physiological changes in invasive green iguanas (Iguana iguana)
Title
Behavioral and physiological changes in invasive green iguanas (Iguana iguana).
Creator
Campbell, Ashley B., Graduate College
Date Issued
2010-04-09
PURL
http://purl.flvc.org/fcla/dt/3176269
Format
Document (PDF)
Effects of a severe winter on invasive green iguanas (Iguana iguana)
Title
Effects of a severe winter on invasive green iguanas (Iguana iguana).
Creator
Campbell, Ashley B., Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
The green iguana (Iguana iguana) is an herbivorous lizard native to South America and is invasive in south Florida. The severe weather in January 2010 negatively impacted many species and significantly reduced the green iguana population, specifically adult females and juveniles of both sexes. Fifteen adult iguanas from two locations in Palm Beach County were tagged and had blood drawn for blood chemistry and HPLC steroid hormone analysis. Individuals were tracked for home range/territory...
Show moreThe green iguana (Iguana iguana) is an herbivorous lizard native to South America and is invasive in south Florida. The severe weather in January 2010 negatively impacted many species and significantly reduced the green iguana population, specifically adult females and juveniles of both sexes. Fifteen adult iguanas from two locations in Palm Beach County were tagged and had blood drawn for blood chemistry and HPLC steroid hormone analysis. Individuals were tracked for home range/territory analysis and behavioral observations. Blood chemistry values of cold-stunned individuals showed abnormal values similar to those reported in cold-stunned sea turtles. Territoriality and breeding behaviors, including nesting and head-bob displays, decreased or ceased during the following months. Steroid hormone concentrations were detected by HPLC and were not consistent with results from RIA studies in the literature.
Show less
Date Issued
2011
PURL
http://purl.flvc.org/FAU/3174507
Subject Headings
Weather, Environmental aspects, Adaptation (Biology), Climate changes, Environmental aspects, Conservation biology
Format
Document (PDF)
An Analysis of the Demography and Habitat Usage of Roatan's Spiny-tailed Iguana, Ctenosaura oedirhina
Title
An Analysis of the Demography and Habitat Usage of Roatan's Spiny-tailed Iguana, Ctenosaura oedirhina.
Creator
Campbell, Ashley B., Maple, Terry, Gawlik, Dale E., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Psychology
Abstract/Description
The Roatan Spiny-tailed Iguana (Ctenosaura oedirhina) is endemic to the 146-km2 island of Roatn, Honduras. Harvesting for consumption, fragmentation of habitat, and predation by domestic animals threaten this lizard. It is currently listed as Endangered by the International Union for Conservation of Nature (IUCN), as threatened by the Honduran government, and is on Appendix II of the Convention on International Trade in Endangered Species (CITES). This species has been geographically...
Show moreThe Roatan Spiny-tailed Iguana (Ctenosaura oedirhina) is endemic to the 146-km2 island of Roatn, Honduras. Harvesting for consumption, fragmentation of habitat, and predation by domestic animals threaten this lizard. It is currently listed as Endangered by the International Union for Conservation of Nature (IUCN), as threatened by the Honduran government, and is on Appendix II of the Convention on International Trade in Endangered Species (CITES). This species has been geographically fragmented and genetically isolated into small subpopulations that are declining in density. With data gathered from use/availability surveys, resource selection functions were used to identify habitats and environmental variables associated with their presence. Results indicate that protection from harvesting is the most important factor in determining their distribution. These high-density populations are currently restricted to ~0.6 km2. Organisms living in small, isolated populations with very restricted ranges are at higher risk of extirpation due to various direct and indirect forces. Mark-recapture-resight surveys and distance sampling have been used to monitor the populations since 2010 and 2012 respectively. The data show that the high-density populations are declining. The current population size is estimated to be 4130-4860 individuals in 2015. A population viability analysis (PVA) was conducted to identify the most pressing threats and specific life history traits that are affecting this decline. The analysis estimates that if current trends persist, the species will be extinct in the wild in less than ten years. Adult mortality is a main factor and female mortality specifically characterizes this decline. In order for this species to persist over the next fifty years, adult mortality needs to be reduced by more than 50%. A lack of enforcement of the current laws results in the persistence of the main threat, poaching for consumption, thus altering the species distribution and causing high adult mortality. This is complicated by social customs and a lack of post primary education. Management changes could mitigate this threat and slow the population decline. Recommendations include an education campaign on the island, increased enforcement of the current laws, and breeding of C. oedirhina in situ and ex situ for release into the wild.
Show less
Date Issued
2015
PURL
http://purl.flvc.org/fau/fd/FA00004486, http://purl.flvc.org/fau/fd/FA00004486
Subject Headings
Adaptation (Biology), Conservation biology -- Honduras -- Roatán Island, Iguanas -- Black spiny tailed -- Honduras -- Roatán Island -- Habitat., Roatán Island (Honduras) -- Ecology
Format
Document (PDF)