Overview

Distribution

Range Description

A. c. venustissimus occurs on Española and Gardner Islands. Extent of occurrence is estimated at less than 1,000 km² and area of occupancy at less than 10 km².
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The world's only marine lizard species. Adults and juveniles occur on rocky coast and intertidal zones. Adult females can be found nesting up to 2 km inland and adult males can be found in marine waters, up to depths of 20 m.

Systems
  • Terrestrial
  • Marine
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
B2ac(iv)

Version
3.1

Year Assessed
2004

Assessor/s
Nelson, K., Snell, H. & Wikelski, M.

Reviewer/s
Hudson, R. & Alberts, A. (Iguana Red List Authority)

Contributor/s

Justification
The marine iguana Amblyrhynchus cristatus is endemic to the Galápagos Islands, Ecuador. A. c. venustissimus is found on Española and Gardner Islands. Extent of occurrence is estimated at less than 100 km² and area of occupancy at less than 10 km². There are two subpopulations, with an estimated total 10,000–21,000 individuals. The main threat to the population is fluctuations in population size as a result of El Niño effects.
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Population

Population
Average generation length is 5 years for females and 12 years for males. The total current population is estimated at between 10,000–21,000 individuals occurring in two locations.

Population Trend
Stable
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Threats

Major Threats
El Niño causes extreme fluctuations in population size. The population may also be threatened by pollution.
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Management

Conservation Actions

Conservation Actions
A. cristatus is included on CITES Appendix II. It is under "Special Law" in the Galápagos and occurs in three protected areas: Galápagos National Park and National Marine Reserve; Galápagos Islands Man and Biosphere Reserve (UNESCO); and Galápagos Islands World Heritage Site.

Conservation actions recommended for the subspecies include: further surveys for the subspecies, taxonomic and limiting factor research, and monitoring of the population and its habitat.
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