Brown leaf chameleon

Brown leaf chameleon
Brown leaf chameleon in Ranomafana National Park
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Lacertilia
Family: Chamaeleonidae
Genus: Brookesia
Species: B. superciliaris
Binomial name
Brookesia superciliaris
(Kuhl, 1820)

The brown leaf chameleon (Brookesia superciliaris) is a small chameleon found on a small island off the eastern coast of Madagascar. Its appearance mimics that of a dead leaf.

Description

The brown leaf chameleon is distinguished by its elongated, high, laterally squashed body that resembles a rolled-up, dead leaf. The size and appearance of this chameleon varies considerably over its vast range, and it may be any shade of brown, beige, grey, olive, green, or dark red, but usually display colours and patterns that mimic a dead leaf. Despite its tiny size, the brown leaf chameleon has an imposing appearance due to two pronounced horns that protrude from the head above each eye and four spiny scales that jut from the throat.[1]

Distribution and habitat

The brown leaf chameleon occurs in eastern Madagascar (including the island of Nosy Boraha),[2] from sea level up to altitudes of over 1,250 metres (4,100 ft).[3] The floor of evergreen primary forest is the preferred habitat of the brown leaf chameleon, but it may also be found in secondary forest and adjacent overgrown plantations.[4] It seems to prefer closed-canopy forest, and climbs higher in the forest (up to 1.5 m (4.9 ft)), more often than other species of Brookesia.[1]

Ecology and behavior

The brown leaf chameleon spends its days foraging among dead leaves on the forest floor,[1] searching for prey with its independently moving, protruding eyes and catching insects with its long, sticky tongue.[5] If threatened, the lizard's first reaction is to stay still and rely on its remarkable camouflage, but it may also exhibit other defence behaviours. This includes the 'freeze-and-roll' technique, in which the chameleon folds its legs underneath its belly, rolls over to one side and remains very still, mimicking a dead leaf on the forest floor.[6] Alternatively, the brown leaf chameleon may also thrust its spines to ward off predators.[7]

Brown leaf chameleons have an interesting courtship ritual in which a male approaches a female with pronounced nodding and rocking movements. An unreceptive female repels a male by reacting with jerky movements, while a receptive female walks with the male. After some time walking together, and before dusk, the male mounts the female and is carried on her back until the pair copulates in the late evening or at night. This species is known to store sperm.[1] Between 30 and 45 days after copulation, the female lays two to five eggs, which she hides under dead leaves, moss, and pieces of bark on the forest floor. Sometimes, a true nest is excavated and the clutch is laid on to the ground. The eggs hatch after 59 to 70 days; the brown leaf chameleon reaching sexual maturity within one year.[1]

Threats and conservation

Like other Brookesia chameleons, the brown leaf chameleon is threatened primarily by habitat destruction,[2] which is the result of agricultural expansion, timber extraction, and small-scale mining.[8] Harvesting for the international pet trade does occur, but is unlikely to be threatening its survival.[9] Since 2005, export quotas have been set at 200 individuals per year.[10]

The brown leaf chameleon is listed on Appendix II of the Convention on International Trade in Endangered Species (CITES), meaning that trade in this species should be carefully controlled to be compatible with their survival.[11] It is also known to occur in a number of protected areas, including Befotaka-Midongy National Park,[12] Mantadia National Park,[4] Analamazoatra Special Reserve,[4] and Kalambatitra Special Reserve.[13] Although illegal harvesting and other activities that degrade the forest habitat may lessen any benefits this bestows, this species is more tolerant of forest disturbance than other leaf chameleons.

References

This article incorporates text from the ARKive fact-file "Brown leaf chameleon" under the Creative Commons Attribution-ShareAlike 3.0 Unported License and the GFDL.

  1. 1 2 3 4 5 Nečas, P. and Schmidt, W. (2004) Stump-tailed chameleons. Miniature Dragons of the Rainforest. Edition Chimaira, Frankfurt.
  2. 1 2 Carpenter, A.I. and Robson, O. (2005) A review of the endemic chameleon genus Brookesia from Madagascar, and the rationale for its listing on CITES Appendix II. Oryx, 39(4): 345-380.
  3. ↑ Andreone, F., Randrianirina, J.E., Jenkins, P.D. and Aprea, G. (2000) Species diversity of Amphibia, Reptilia and Lipotyphla (Mammalia) at Ambolokopatrika, a rainforest between the Anjanaharibe-Sud and Marojejy Massifs, NE Madagascar. Biodiversity and Conservation, 9: 1587-1622.
  4. 1 2 3 Rakotondravony, H. (2004) Diversité des caméléons forestiers de la région d'Andasibe (Madagascar) et modèle de distribution de cette communauté selon différent types physionomiques. La Terre et la vie: Revue d'Ecologie, 59: 529-544.
  5. ↑ Halliday, T. and Adler, K. (2002) The New Encyclopedia of Reptiles and Amphibians. Oxford University Press, Oxford.
  6. ↑ Raxworthy, C. J. (1991) Field observations on some dwarf chameleons (Brookesia spp.) from rainforest areas of Madagascar, with the description of a new species. Journal of Zoology, 224: 11-25.
  7. ↑ "Brown Leaf Chameleon". Retrieved 2 August 2011.
  8. ↑ Conservation International: Biodiversity Hotspots Archived December 4, 2008, at the Wayback Machine. (February 2008).
  9. ↑ Arkive factsheet (citing personal communication with Dr Richard K.B. Jenkins, Madagasikara Voakajy and Durrell Institute of Conservation and Ecology, University of Kent.)
  10. ↑ CITES Export Quotas Archived August 3, 2011, at the Wayback Machine. (March 2011).
  11. ↑ CITES (July 2007).
  12. ↑ Bora, P., Randriambahiniarime, O., Rabemananjara, F.C.E., Ramilijaona, O.R., Glaw, F. and Vences, M. (2007) A rapid assessment survey of the herpetofauna at Befotaka-Midongy National Park, south-eastern Madagascar. Mitteilungen des Museums für Naturkunde Berlin, Zoologische Reihe, 83: 170-178.
  13. ↑ Andreone, F., and Randrianirina, J. (2007) The amphibians and reptiles of Kalambatritra, a little-known rainforest of south-eastern Madagascar. Bollettino del Museo Regionale di Scienze Naturali di Torino, 24: 179-190.

External links

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