Cyclura rileyi nuchalis

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Acklins ground iguana
Cyclura rileyi nuchalis Exumas 1997 c W K Hayes.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Iguania
Family: Iguanidae
Genus: Cyclura
Species:
C. rileyi
Subspecies:
C. r. nuchalis
Trinomial name
Cyclura rileyi nuchalis
Barbour and Noble, 1916

The Acklins ground iguana (Cyclura rileyi nuchalis), also commonly known as the Watling Island iguana, is an endangered subspecies of lizard of the genus Cyclura it is one of three subspecific forms of Cyclura rileyi in the family Iguanidae.

Contents

Taxonomy

The Acklins ground iguana is a recognized subspecies of the San Salvador rock iguana, recognized as such since 1975. [1] Its specific name, rileyi, is a Latinized form of the name of American biologist, Joseph Harvey Riley. [2]

Anatomy and morphology

The Acklins ground iguana strongly resembles the San Salvador rock iguana in color and shape. The lizard's back color can range from red, orange or yellow, to green, brown or grey, usually patterned by darker markings. The very brightest colors (red, orange or yellow) are normally only displayed by males and are more pronounced which at warmer body temperatures. Immature iguanas lack these bright colors, being either solid brown or grey with faint slightly darker stripes. What makes this iguana stand out from the other two subspecies is the scalation on its neck and head.

This subspecies, like other members of Cyclura, is sexually dimorphic; males are larger than females, and have more prominent dorsal crests as well as larger femoral pores on their thighs, which are used to release pheromones. [3] [4]

Distribution

The Acklins ground iguana is endemic to three small cays in the Bahamas.

Natural populations of Acklins ground iguanas are found only on Fish Cay and North Cay in the Acklins Bight, Bahamas. [5] They formerly inhabited Long (Fortune) Cay. An additional introduced population with five founding individuals was established on a small cay in the early 1970s. [5] [6]

These two populations are made up of 12,500-18,800 individual animals. [5] A translocated population in the Exumas Land and Sea Park contains 300 animals and appears to be stable. [5]

Diet

Like all Cyclura species the Acklins ground iguana is primarily herbivorous, 95% of which from consuming leaves, flowers and fruits from 7 different plant species such as seaside rock shrub ( Rachicallis americana ), and erect prickly pear ( Opuntia stricta ). This diet is very rarely supplemented with animal matter, although a wild specimen has been recorded eating mice. [5]

Mating

Mating occurs between May and June depending on when the dry season ends, and 2-5 eggs are usually laid within 40 days depending on the size and age of the female. [6] Some females have been observed migrating to coastal areas on the various cays in order to build their nests in the sand, and some guard the nest site for a short period of time. [6] The hatchlings emerge from the nests in August to early September.

Habitat

Unlike every other species of Cyclura the Acklins ground iguana is free of threats by feral predators. [5] The cays they dwell on are remote and human populations leave the animals undisturbed. [5] Natural predators in the form of ospreys, herons, kestrels and seagulls have minimal impact on the populations. [5]

The Acklins Cays also have an abundance of food and vegetation compared to the cays on which other iguanas are found and this also must be considered as a factor in their success. [5] Sea level rise may be the greatest threat these animals face in the future, as the cays lack elevation relief and a sea level rise of 1 meter over the next 100 years could cost the cays up to 50% habitat loss. [5]

Related Research Articles

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<i>Cyclura nubila</i> Species of reptile

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<i>Cyclura rileyi</i> Species of lizard

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The Andros Island iguana or Andros iguana is an endangered subspecies of Northern Bahamian rock iguana of the genus Cyclura that is found on Andros Island on the western edge of Grand Bahama. Its status is Endangered, with a wild population of 3,500 animals, and it can be found on the IUCN Red List.

Cyclura carinata bartschi, commonly known as Bartsch's iguana or the Booby Cay iguana, is a subspecies of lizard in the family Iguanidae. The subspecies is endemic to a single cay, Booby Cay, in The Bahamas.

<i>Cyclura nubila caymanensis</i> Subspecies of lizard

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<i>Cyclura cychlura inornata</i> Subspecies of lizard

Cyclura cychlura inornata, the Allen Cays rock iguana or Allen Cays iguana, is a subspecies of the northern Bahamian rock iguana that is found on Allen's Cay and adjacent islands in the Bahamas. Its status in the IUCN Red List is critically endangered, with an estimated wild population of 482–632 animals.

<i>Cyclura cychlura figginsi</i> Subspecies of lizard

'Cyclura cychlura figginsi, known by the common name of guana and sometimes called the Exuma Island iguana in the international literature, is a subspecies of the northern rock iguana, C. cychlura, that is found on the Exuma island chain in the Bahamas with an estimated wild population of 1,300 animals in 2004, it has been listed on the IUCN Red List as critically endangered.

<i>Cyclura rileyi cristata</i> Subspecies of lizard

Cyclura rileyi cristata, the White Cay iguana or Sandy Cay rock iguana, is a critically endangered subspecies of lizard of the genus Cyclura native to a single cay in the Bahamas: White Cay located in the Southern Exumas.

<i>Cyclura</i> Genus of lizards

Cyclura is a genus of lizards in the family Iguanidae. Member species of this genus are commonly known as "cycluras" or more commonly as rock iguanas and only occur on islands in the West Indies. Rock iguanas have a high degree of endemism, with in most cases a single species or subspecies restricted to an individual island.

<i>Cyclura pinguis</i> Species of reptile

Cyclura pinguis, the Anegada rock iguana, Anegada ground iguana or stout iguana, is a critically endangered species of lizard of the genus Cyclura belonging to the family Iguanidae. The species can be found exclusively in the islands of Anegada and Guana. Historically, it inhabited the islands of Puerto Rico and Saint Thomas, however, the animal's original range has been greatly diminished over prehistory.

References

  1. ↑ Hollingsworth, Bradford D. (2004), "The Evolution of Iguanas: An Overview of Relationships and a Checklist od Species", Iguanas: Biology and Conservation, University of California Press, pp. 35–39, ISBN   978-0-520-23854-1
  2. ↑ "Riley, Joseph - Biography", Washington Biologists' Field Club, Patuxent Wildlife Research Center
  3. ↑ De Vosjoli, Phillipe; David Blair (1992), The Green Iguana Manual , Escondido, California: Advanced Vivarium Systems, ISBN   1-882770-18-8
  4. ↑ Martins, Emilia P.; Lacy, Kathryn (2004), "Behavior and Ecology of Rock Iguanas,I: Evidence for an Appeasement Display", Iguanas: Biology and Conservation, University of California Press, pp. 98–108, ISBN   978-0-520-23854-1
  5. 1 2 3 4 5 6 7 8 9 10 Hayes, William; Carter, Ronald; Cyril, Samuel; Thornton, Benjamin (2004), "Conservation of an Endangered Bahamian Rock Iguana, I", Iguanas: Biology and Conservation, University of California Press, pp. 232–243, ISBN   978-0-520-23854-1
  6. 1 2 3 Thornton, Benjamin (June 2000), Nesting Ecology of the Endangered Acklins Bight Rock Iguana, Cyclura Rileyi Nuchalis, In The Bahamas, abstract, Andrews University.
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