Using GIS to Save the Anegada Iguana

1
Using GIS to Save the Anegada Iguana
Introduction Conservation biologists are now usi
ng global information systems (GIS) in their
fight to save endangered species. This powerful
tool is providing researchers with valuble
information needed to manage the long term
survival of these vulnerable species.
Anegada is the second largest island in the Brit
ish Virgin Islands (31 km2). This unique island
is home to the endemic Anegada iguana,Cyclura
pinguis. This iguana is a critically endangered
species. The population is estimated to be
between 200 and 400 individuals.
The primary threat to the survival of this speci
es is the feral cat (Felis catus) population on
the island. Each year this introduced
predator kills most hatchling iguanas within
months of emerging, resulting in very little rec
ruitment.
Population Survey Initial population surv
eys were conducted in 1998 to identify the
location of the remaining population, and its key
nesting sites. A GIS map was constructed to
illustrate these important locations. This map
will help the BVI government identify the area
that should be made a national park in order to
protect the remaining habitat of the Anegada
iguana.
Habitat Zones During the 2004 Darwin Initiat
ive, the entire island was surveyed to document
the biodiversity of Anegada. The data collected
during this project was used to create this map
that illustrates the different habitat/vegetation
zones on Anegada. This information will be used
along with iguana location data to construct
habitat preference profiles for the Anegada
iguana.
Radio-Tracking Iguanas In 2003, the Dallas Zoo
began monitoring the first headstarted iguanas
released back into the wild, fitting them with
radio transmitters so they could be monitored
throughout the release process. This map shows
the locations of the first released iguanas
during their first 30 days back in the wild.