However, the Service will continue to review the status of these turtles, as there is at least circumstantial evidence which leads scientists to believe they might be declining.
Gray’s monitor lizard, Varanus grayi, was also included in the notice of review. Based on the preliminary work of Dr. Walter Auffenberg (Auffenberg, 1976b, 1979a, b), this large lizard was believed to be threatened through habitat destruction and killing by local people for food. In 1981, the Service funded (in part) additional research and surveys on the lizard to develop a management plan. The Service has received a final report (Auffenberg, 1982b) in which Dr. Auffenberg states that while Philippine protection is necessary, listing under provisions of U.S. Federal law is not warranted at this
time. Hence, this species is not included in this proposed rule. One additional species from the notice, the Hierrogiant lizard (Gallotia simonyi), is not included in this proposal, since it is now believed extinct (R. Honegger, pers. comm.). The Service has reviewed additional literature references and believes that sufficient data exist to propose the Round Island skink, Leiolopisma telfairii, as a Threatened species even though it was not originally included in the notice. Finally, the notice treated the iguana Cyclura nubila as a single species; in the proposal, the subspecies are treated individually because of different degrees of threats to them. The species included in this proposed rule, their proposed status and their IUCN status are as follows:
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Round Island skink…………………….. …..| Leiosopisma teffairii…………….. Threatened…..
Central American river turtle Oe ys mawif Endangered….
Aruba island rattlesnake Crotatus unicolor………………………………………………………………. Threatened……………………………..
Lar Valley wiper………… Vipera satifi Endangered
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..] Rare. … Rare. … Endangered. ..] Rare. : Rare. ..] Vulnerable. Rare. Endangered.
A brief description of these species and applicable threats is as follows:
Serpent Island gecko—This lizard is restricted to Round Island (151 hectares) where it is rare and Serpent Island (20 hectares) where it is considered very rare; both islands are near Mauritius. Predation from feral animals and habitat destruction are the chief causes of its decline (Honegger, 1979). There are estimated to be between 3,600 and 4,500 lizards remaining. The overall problems of the Round Island ecosystem and its resident herpetofauna have been presented in detail (Bullock, 1977). Round Island is presently a nature reserve and endemic lizards cannot, by law, be captured or exported from Mauritius. The lizards have also been discussed by Vinson and Vinson (1969) and Temple (1977).
Bahame species of Cyclura—All these species are listed in the International Union for the Conservation of Nature and Natural Resources (IUCN) Red Date Book as being of concern (Honegger, 1979). The main threats to their continued survival include habitat destruction for resort development and
the introduction of feral animals, particularly mongooses, cats, and dogs which prey upon the iguanas, especially the young and juveniles, and destroy nests (Iverson, 1978). Introduced goats may compete for food (these species are vegetarian) and humans kill them for food or malicious”sport.” Nearly all these iguanas have very small ranges; many are limited to a single island. Discussions of the threats to these species are contained in Honegger (1979), Carey (1966, 1975), Iverson and Auffenberg (1979), Iverson (1978), Auffenberg (1975, 1976a, 1982), and Gicca (1980). While legal protection is afforded these iguanas in the Bahamas, the law is not enforced (Honegger, 1979). The Service has funded research on C. r. Tileyi to study a potentially serious fungal disease. Cuban and Cayman Islands iguanas— There are three subspecies of Cyclura nubila inhabiting Cuba (mainland and Isla de Pinos) and the Cayman Islands. These are: C. n. Caymenensis (one colony on Cayman Brac), C. m. lewisi (no less then 50 individuals on Grand Cayman Island, and C. n. nubila (Cuba
and adjacent islands and cays). The threats to these iguanas are similar to those of the Bahamas Cyclura (Honegger, 1979) and Townson (1981) has noted additional potential threats from habitat destruction. C. n. nubila is protected in Cuba. Turks and Caicos iguana—The same threats which apply to the Bahama Cyclura also apparently apply to this species (Honegger, 1979). It is found on most of the islands in the Turks and Caicos group. No specific protection laws have been enacted and although several cays where this species occurs are supposed to be reserves, protection is nil (Honegger, 1979). Jamaican iguana—The following is taken from Woodley (1980) who has reviewed the history and status of this species: “For a hundred years, they were only known to survive on the Goat Islands but, after the introduction of the mongoose and the interference consequent to the Second World War, that population became extinct in about 1948. But iguanas had, after all, survived on the mainland; in the Hellshire Hills.
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Hog-hunters have been catching occasional specimens up to 1978 and one of these, killed in 1969, was obtained by the author and positively identified. It is unlikely that the Jamaican iguana, already very rare, will survive the proposed development of the Hellshire Hills.” Round Island skink—This species is presently confined to Round Island off the coast of Mauritius. It was once found on Flat Island and Gunner’s Quoin until exterminated by rats. In 1974, the population was thought to be between 4,000–5,000 but declining. Those factors contributing to the decline of other species on Round Island (Bullock, 1977) are also thought to be contributing to the decline of this species (Honegger, 1979; also, see Temple, 1977, and Vinson and Vinson, 1969). Aruba Island rattlesnake—According to Honegger (1979), the habitat of this rattlesnake is shrinking as a result of increasing human activity. Collection may also be contributing to its decline. Lar Valley wiper—Andren and Nilson (1979) have reviewed the biology of this species and state: “Vipera latifii Mertens, Darevsky and Klemmer, a recently described viper from northern Iran, is in severe need of conservation. Its range is restricted to unique, alpine Lar Valley, which in a few years will be used as a huge water reservoir. Observations on the biology of Vipera latiffii are given. Sympatric amphibians and reptiles show ecotypic adaptations.” Central American river turtle—This large river turtle is found only in the coastal lowlands of southern Mexico, northern Guatemala, and Belize. It is hunted extensively for its meat and has been seriously depleted throughout much of its range. According to Alvarez del Toro et al. (1979), this exploitation could lead to its extinction. Additional information on its biology is contained in Smith and Smith (1979) and Iverson and Mittermeier (1980). The Service will follow Iverson and Mittermeier (1980) in the spelling of the specific epithet (i.e., mawii). Summary of Factors Affecting the Species
Section 4(a)(1) of the Endangered Species Act (16 U.S.C. 1531 et seq.) and regulations promulgated to implement the listing provisions of the Act (codified at 50 CFR Part 424; under revision to accommodate 1982 amendments) states that the Secretary of the Interior shall determine whether any species is an Endangered species or a Threatened species due to one or more of the five factors described in Section 4(a)(1) of
the Act. This authority has been delegated to the Assistant Secretary for Fish and Wildlife and Parks. These factors are as follows: (A) The present or threatened destruction, modification, or curtailment of its habitat or range; (B) Overutilization for commercial, recreational, scientific, or educational purposes; (C) Disease or predation; (D) The inadequacy of existing regulatory mechanisms; or (E) Other natural or manmade factors affecting its continued existence.”
The reptiles proposed for listing as Endangered and Threatened species relate to these factors as follows (numbers refer to factors above): Serpent Island gecko—(A) Rabbits and goats were introduced onto Round Island in 1840 and these animals have destroyed the island’s vegetation so that severe erosion has resulted. The loss of this vegetative cover is thought to have resulted in the loss of available habitat for this species. (C) Since there are no palms on Serpent Island, the scarcity of this species on Round Island has also been attributed to predation. Acklins ground iguana—(A) This species is found only on Fortune Island and Guana Cay in Acklin’s Bight. There are probably less than 1,000 individuals remaining. Increased human settlement in the Bahamas has resulted in the loss of available habitat for this species. (C) Predation by people who use this species for food is thought to have decreased its numbers. (D) While legally protected in the Bahamas, the law is not enforced. Allen’s Cay iguana—(A) This species is found in the Allen Cay group at the northern end of the Exuma Island chain. Like other species of Bahamian iguanas, this species has lost habitat because of human encroachment. There are 75–100 individuals remaining on each island of the group. (C) This subspecies is threatened by being needlessly slaughtered by tourist fishermen for “sport” and is sometimes hunted by local people for food. (D) This iguana is legally protected by the Bahamas, but the law is not enforced. Andros Island ground iguana—(A) This species is primarily found along the western two-thirds of the Andros group. This iguana is losing habitat to agricultural and commercial development and from lumbering. (B) According to Honegger (1979), there is extensive commercial exploitation. (C) This species is used for food by local people who hunt it with dogs. Hog predation on its eggs is also a problem. (D) This iguana is legally protected by
the Bahamas, but the law is not enforced. Cayman Brac ground iguana—(C) This iguana is known only from Cayman Brac and Little Cayman Islands although introduced onto Grand cayman. The population has been reduced by predation from feral pigs, cats, and dogs. Humans also hunt the ground iguana. Cuban ground iguana—(C) This iguana is known from Cuba, Isla de Pinos, and a number of offshore islands and cays. All populations are probably suffering from predation by feral pigs, cats, and dogs. Humans also occasionally hunt the ground iguanas. Exuma Island iguana—(A) This iguana is found on Bitter Guana Cay, Guana Cay, Prickley Pear Cay, and Allen Cay in the Exuma group. This subspecies is threatened by the development of its remaining habitat primarily for commercial and residential purposes. (B) Honegger (1979) states that commercial trade is a threat to this subspecies. (C) Hunting of the iguanas for food and shooting them for “sport” by tourists are threats to this iguana. (D) While this iguana is protected by Bahamian law, the law is not enforced. Grand Cayman ground iguana—(C) This iguana is known only for Grand Cayman; there is believed to be a population of not less than 50 individuals remaining. Threats to the population are mainly thought to be predation from feral pigs, cats, and dogs. Humans also hunt the ground iguanas in the Cayman Islands. Jamaican iguana—(A) Until recently, this species was thought extinct. However, it survives probably is very low numbers in the Hellshire Hills. This area is proposed to be developed. If this occurs, the remaining small population will become extinct. (C) Dogs and people are known to kill these iguanas. Any such loss to the population is a threat to its continued existence. Mayaguana iguana—(A) This subspecies is known only from Bobby Cay east of Mayaguana. According to Honegger (1979), there has been some loss of habitat due to human activities. (C) This species is hunted by local people for food. (D) While legally protected by Bahamian law, the law is not enforced. Turks and Caicos ground iguana—(A) This iguana is found throughout the Turks and Caicos group. According to Honegger (1979), it is declining because of the loss of suitable habitat through housing development and agriculture. (C) Like other ground iguanas, this species is subject to predation from humans and feral dogs and cats. (D) While some of the islands on which this species occurs have been designated as reserves, enforcement is nil. Watling Island (San Salvador) ground iguana—(C) This species is known only from Green Key, Man Head Key, Pidgeon Key, Low Key, and Goulding Key. Though previously reported from White Key and a number of adjacent keys, Gicca (1980) and Auffenberg (1982) note that none were found on these keys during surveys in 1974 and 1981, respectively. There may be a small remnant on San Sahvador in the interior of the island. Causes for extirpation and decline include predation by humans for food and the introduction of feral predators. In addition, a serious fungal disease has in the past affected this subspecies; its cause and long term effects are unknown.but many iguanas have been scarred by it. White Cay ground iguana—(A) This iguana is known only from White Cay in the Bahamas where there are believed to be less than 1,000 individuals. The main threat to this species is from the loss of habitat from an encroaching human population. (B) According to Honegger (1979), the live animal trade could be having an adverse effect on this species. (C) Humans are predators on this species for food. Round Island skink—(A) This species is now restricted to Round Island. Rabbits and goats were introduced onto Round Island in 1840 and these animals have destroyed the island’s vegetation so that severe erosion has resulted. The loss of this cover is though to have resulted in the loss of available habitat for this species. (C) Rats are known predators and are thought to have eliminated this species on Flat Island and Gunner’s Quoin. Central American River turtle: (B) This large river turtle is found only in the coastal lowlands of southern Mexico, northern Guatemala, and Belize. It is hunted extensively for food and has been seriously depleted throughout its range. If this intensive exploitation continues, not only will the turtle disappear, but the local inhabitants will lose an important part of their diet. Turtle meat labeled as from Dermatemys has occasionally been imported into the United States. However, as shown in a recent law enforcement case, this meat was actually from sea turtles. The extent of possible international commercial trade in meat from this turtle is impossible to gauge, but could be significant as there have been numerous inquiries from soup companies as to its legality for trade. Aruba Island rattlesnake—(A) According to Honegger (1979), the habitat of this rattlesnake is shrinking as a result of increasing human activity.
(B) The extent of this problem is unknown, although overcollecting may be a problem for this species. However, captive propagation, such as undertaken at the Houston Zoo (Carl et al., in press) should be able to provide needed specimens for education and zoological display. Lar Valley viper—(A) This species is confined to the alpine Lar Valley in Iran. According to Andrew and Nilson (1979), there is the threat of construction of a dam for a water reservior which would eliminate its habitat.
Effects of the Proposal if Published as Final Rule
Endangered species regulations already published in Title 50 of the Code of Federal Regulations set forth a series of general prohibitions and exceptions which apply to all Endangered and Threatened species. The regulations referred to above, which pertain to Endangered and Threatened species, are found at $$ 17.21 and 17.31 of Title 50, and are summarized below.
With respect to the 17 species of reptitles in this proposed rule, all prohibitions of Section 9(a)(1) of the Act, as implemented by 50 CFR 17.21 and 17.31 would apply. These prohibitions, in part, would make it illegal for any person subject to the jurisdiction of the United States to take, import or export, ship in interstate commerce in the course of a commercial activity, or sell or offer for sale these species in interstate or foreign commerce. It also would be illegal to possess, sell, deliver, carry, transport, or ship any such wildlife which was illegally taken. Certain exceptions would apply to agents of the Service and State conservation agencies.
Permits may be issued to carry out otherwise prohibited activities involving Endangered and Threatened species under certain circumstances. Regulations governing permits are codified at 50 CFR 17.22, and 17.23, and 17.32. Such permits are available for scientific purposes, the enhancement or propagation or survival of the species, and economic hardship.
Literature Cited
Alvarez del Toro, M., R.A. Mittermeier, and J. B. Iverson. 1979. River turtle in danger. Oryx, Nov., pp. 170–173
Andren, C. and G. Nilson. 1979. Vipera Latifii (Reptilia, Serpentes, Viperidae) an Endangered viper from Lar Valley, Iran, and remarks on the sympatric herpetofauna. J. Herpetol. 13:335–341
Auffenberg, W. 1975. The dragon isles: West Indian rock iguanas. Bahamas Nat. 1(1):2–7
1976a. Bahamas rock iguanas, Part two.
Bahamas Nat. 2(1):9–16
1976b. First description of an adult Varanus grayi. Copeia 1976:586–588 1979a. A monitor lizard in the Philippines. Oryx, June. pp. 39–46 1979b. Research on monitor lizards. Tigerpaper. 4(4):20–21 1982a. Conservation of Bahamian rock iguanas (Cyclura sp.). Project report to U.S. Fish and Wildlife Serv., Washington. D.C. 16 pp 1982b. Final report: A study of activity patterns and spacing in Varanus grayi. Final rept. to U.S. Fish and Wildlife Service, Washington, D.C., 5 pp., 1 fig. 1 table Bullock, D. 1977. Round Island—a tale of destruction. Oryx, July. pp. 51–58 Carl, C., K.H. Peterson, and R.M. Hubbard. In press. Reproduction in captive Aruba Island rattlesnakes, Crotalus unicolor. Herp. Rev Carey, W.M. 1966. Observations on the ground iguana Cyclura macleayi caymanensis on Cayman Brac, British West Indies. Herpetologica 22:265–268 1975. iguanas on the rocks. Animal Kingdom 78(2):15–20 Gicca, D. 1980. The status and distribution of Cyclura r. rileyi (Reptilia: Iguanidae) a Bahamian rock iguana. Carib. J. Sci. 16(14):9–12 Honegger, R.E. (ed.) 1979. Amphibia and Reptilia. IUCN Red Data Book, Vol. 3, Morges, Switzerland Iverson, J.B. 1978. The impact of feral cats and dogs on populations of the West Indian rock iguana, Cyclura carinata. Biol. Conserv. 14:63–73 Iverson. J.B. and W. Auffenberg. 1979. Status and biology of Bahamian archipelago rock iguanas (Cyclura). Paper presented of Bahamian archipelago rock iguanas Cyclura). Paper presented at joint meeting of the Herp. League and Soc. Study Amphib. and Rept., Knoxville, TN Iverson, J. B. and R. A. Mittermeier. 1980. Dermatemys mawii. Cat. Amer. Amphib. Rept. 237.1–237.4 Smith, H. B. and R. B. Smith. 1979. Synopsis of the Herpetofauna of Mexico. Vol. VI. Guide to Mexican turtles, Bibliographic Addendum III. John Johnson Publ., N. Bennington, VT Temple, S.A. 1977. Castaway reptiles of the Indian Ocean. Anim. Kingdom. Aug./Sep. pp. 19–27 Townson, S. 1981. West Indian iguanas of the genus Cyclura: the threat of habitat destruction in the Cayman Islands. Br. J. Herpetol. 6(1):101–104 Vinson, J. and J. M. Vinson. 1969. The Saurian fauna of the Mascarene Islands. Maur. Inst. Bull. 6(4):203–320 Woodley, J. D. 1980. Survival of the Jamaican iguana, Cyclura collei. J. Herpetol. 14:45– 49