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Iguana movement patterns / territorial habits / nesting locations
IIn order to most efficiently observe iguana movements, a 50 meter x 50 meter study plot was marked off near to the field camp site. Every tree within the plot was mapped and specific data collected. With this information, when an iguana was observed, the exact location could quickly and easily be determined. This information also helped in establishing if tree-based territories exist. During the course of the project phase, nightly observations were conducted through the plot. Any iguana found was captured and specific data was collected including weight, length and sex. The iguanas were given a unique P.I.T. (passive integrated transponder) tag for permanent identification purposes and then released.
In addition to the nightly observations, a specific Movement Pattern experiment was set up using radio telemetry. For three-weeks, four individual iguanas were fitted with non-obtrusive radio transmitters. These iguanas were tracked regularly using standard radio telemetry equipment and their exact locations recorded.
During this first phase, the team observed some very exciting behavioural patterns and displays between males. This is most likely due to the iguanas preparing for their mating season and possibly establishing territories. Stay tuned for more info as the next project phase gathers even more data!
To watch a short video of two male iguanas fighting, click one of the links below. The video was taken by Media & Communications Liaison: Zachary Pierce on on November 23rd. on Yadua Taba island.
> small movie (600KB)
> larger movie (1.2 MB)
The team also recorded any nesting sites that they encountered during their daily field work in the forests of Yadua Taba. The nests were found at this time because hatchlings were emerging from their nests and visible holes in the ground could be seen. These were usually accompanied by empty eggs shells, either in the hole or nearby. This data will be used to more effectively find nests during the second project phase, hopefully timed with the iguana’s egg-laying season. The team hopes to study many more aspects of nest site location, environmental factors contributing to hatchling mortality and more.
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