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Relative Abundance of Lizards and Marine Toads on Saipan, Mariana Islands

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Title:Relative Abundance of Lizards and Marine Toads on Saipan, Mariana Islands
Authors:Wiles, Gary J.
Guerrero, Jesse P.
Date Issued:Jul 1996
Publisher:University of Hawaii Press
Citation:Wiles GJ, Guerrero JP. 1996. Relative abundance of lizards and marine toads on Saipan, Mariana Islands. Pac Sci 50(3): 274-284.
Abstract:Twelve species of lizards and the marine toad (Bufo marinus L.)
were surveyed in six habitat types at three sites on the island of Saipan, Mariana
Islands, using visual censuses, hand captures, and adhesive traps. Toads
were rare on each of the study sites. Anolis carolinensis Cuvier was most common
in disturbed forests. Four species of geckos, Gehyra mutilata (Wiegmann),
G. oceanica (Lesson), Lepidodactylus lugubris (Dumeril & Bibron), and Perochirus
ateles Dumeril, were most abundant in forests and abandoned buildings,
and a fifth species, Hemidactylus frenatus Dumeril & Bibron, occurred
most frequently on structures of all types and in open fields. The skink Carlia
fusca Dumeril & Bibron was the most abundant diurnal lizard in all habitats.
Emoia caeruleocauda de Vis occurred in all habitat types surveyed except open
fields and was usually much less common than C. fusca. Emoia atrocostata
(Lesson) was documented for the first time on Saipan, with a population found
on a small offshore islet with scrubby strand vegetation. Lamprolepis smaragdina
(Lesson) was relatively common at only one of three study sites, where it
was seen primarily on large tree trunks. Varanus indicus (Daudin) displayed
broad habitat use, but also was common in only one study area. At least five of
these species are introductions, with C. fusca suspected of causing population
reductions of other terrestrial skinks on the island.
Appears in Collections: Pacific Science Volume 50, Number 3, 1996

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