World Library  
Flag as Inappropriate
Email this Article

Cozumel raccoon

Article Id: WHEBN0008249584
Reproduction Date:

Title: Cozumel raccoon  
Author: World Heritage Encyclopedia
Language: English
Subject: Raccoon, Island raccoon, Guadeloupe raccoon, Endemic fauna of Cozumel, Procyonidae
Collection: Animals Described in 1901, Endemic Fauna of Cozumel, Mammals of Mexico, Procyonidae
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Cozumel raccoon

Cozumel Raccoon[1]
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Procyonidae
Genus: Procyon
Species: P. pygmaeus
Binomial name
Procyon pygmaeus
(Merriam, 1901)
Cozumel raccoon range

The Cozumel raccoon (Procyon pygmaeus), also called the pygmy raccoon,[3] is a critically endangered species of raccoon endemic on Cozumel Island off the coast of the Yucatan Peninsula, Mexico.[4][2]

The Cozumel raccoon goes by a variety of common names including the dwarf raccoon, Cozumel Island raccoon, and Cozumel raccoon-bear.[2]

Contents

  • Classification 1
  • Description 2
  • Distribution and habitat 3
  • Behavior 4
  • Diet 5
  • Morphological specializations 6
  • Threats to species survival 7
  • Conservation actions 8
  • References 9

Classification

Clinton Hart Merriam first described the Cozumel raccoon as morphologically distinctive from its mainland relative, the common raccoon subspecies Procyon lotor hernandezii, in 1901. Since then, other scientists have generally agreed with Merriam's assessment, especially Kristofer Helgen and Don E. Wilson, who have dismissed this classification for the other four island raccoons in their studies in 2003 and 2005.[3][5] Therefore, the Cozumel raccoon was listed as the only distinct species of the genus Procyon besides the common raccoon and the crab-eating raccoon in the third edition of Mammal Species of the World.[1] An archaeological study showed that Maya from Cozumel used raccoons of reduced stature, which suggests that the size reduction of this raccoon is not a recent phenomenon.[6]

No true fossils of the species are known, although skeletons have been found at some archeological sites on the island. Cozumel island itself separated from the mainland during the late Pleistocene, so that the species is unlikely to be older than 122,000 years. Data from molecular clock studies implies a divergence date from the common raccoon of anything between 26,000 and 69,000 years ago.[7]

Description

Common raccoon skull (left) and Cozumel raccoon skull (right).

Merriam described the Cozumel raccoon as being markedly smaller, both externally and cranially and easy to distinguish from the common raccoon because of its "broad black throat band and golden yellow tail, short posteriorly expanded and rounded nasals and peculiarities of the teeth".[8] Its reduced teeth point to a long period of isolation.[9]

Apart from its smaller size and more rounded snout, the Cozumel raccoon is similar in appearance to the common raccoon. The fur over the upper body is buff-grey ticked with occasional black hairs, while the underparts and legs are pale buff in color. The top of the head lacks the buff tinge of the rest of the body, and has a grizzled grey coloration, contrasting with the white fur of the muzzle and chin, and with the black "mask" pattern around the eyes. A line of brownish-grey fur runs down the middle of the snout, joining the "mask" patterns on either side. The tail is yellowish, with six or seven black or brown rings that become fainter on the underside. In males, the scruff of the neck has a patch of relatively bright, orange fur.[7]

Adults range from 58 to 82 centimetres (23 to 32 in) in total length, including the 23 to 26 centimetres (9.1 to 10.2 in) tail, and weigh between 3 to 4 kilograms (6.6 to 8.8 lb). This represents an example of insular dwarfism, and the animals are, on average, about 18% shorter and 45% lighter than the subspecies of common raccoon found on the local mainland, P. lotor shufeldti. Cozumel raccoons also exhibit sexual dimorphism, with the males being around 20% heavier than the females.[7]

Distribution and habitat

According to the IUCN Red List, they are considered critically endangered.[2] In fact, they report that only about 250–300 individuals are left on the planet.[2][10] These raccoons are so extremely endangered because of their small geographic range. They are endemic to Cozumel Island, an island around 478 square kilometres (185 sq mi) in area, lying off the east coast of the Yucatan Peninsula in Mexico.[11] Cozumel Island supports several other carnivores, including the dwarf coati (Nasua narica nelsoni) and dwarf gray fox (Urocyon sp.).[12][13] Islands usually lack terrestrial mammals, especially carnivores making the Cozumel raccoon and the others unique.[14]

On the island, the raccoons inhabit a range of habitats, but are primarily limited to the mangrove forests and sandy wetlands in the northwest tip of the island.[11][13] However, they have also been captured in semi-evergreen forests and agricultural lands surrounding these preferred habitats.,[7][12] and in the Punta Sur ecological park at the south end of the island.[13]

Behavior

Relatively little is known about the group size of the raccoons. They are primarily nocturnal and solitary animals, but may sometimes form family groups possibly consisting of the mother and cubs.[13]

The raccoons live in densities of about 17-27 individuals per km2.,[12] and inhabit home ranges of around 67 hectares (170 acres) on average.[15] However, individuals do not appear to defend territories to any great extent, and their close relative, the common raccoon, can exist at very high densities when food is abundant.[16] Although there have been no detailed studies of their reproductive habits, females seem to give birth primarily between November and January, possibly with a second litter during the summer months.[7]

Cozumel raccoon
Cozumel raccoon

Diet

The habitat specificity of Cozumel raccoons is in large part due to the type of foods they consume. Their overall diet consists of crabs, fruit, frogs, lizards, and insects.[11] They are a generalist omnivore, but crabs make up over 50% of their diet.[11] Their diet is somewhat seasonal.[11] During the wet season, fruit and vegetation are more abundant and become a large portion of the raccoons’ diet. Then in the dry season, they begin to consume more of the crabs, insects, lizards, etc. Crabs comprising more than half the food they eat could have an effect on their limited distribution: they stay near the water where crabs are abundant.

Morphological specializations

A large amount of research has been performed to determine whether the Cozumel raccoon is indeed a separate species from the common raccoon. Cuaron et al. (2004) reported that research conducted by many different scholars concludes that they are separate species.[13] Body size and cranium size have been reported to be smaller in P. pygmaeus, hence the name pygmy. Other morphological differences include a broad black throat band, golden yellow tail and reduced teeth; "these and other characteristics point to a long period of isolation".[13]

Threats to species survival

Island carnivores at the top of the food chain often become extinct soon after the arrival of humans.[14] The main danger to the Cozumel raccoon is development of Cozumel island due to the tourism industry.[17] Because the raccoons are only located in a small coastal area at the northwest corner of the island- an area coveted for development- the effects of habitat loss are especially severe.[17] There are no laws protecting the raccoons and also no land set aside for them.[17]

Newer threats to their survival that have been researched in recent years are diseases and parasites.[18] Cozumel has a population of feral cats and domestic cats and dogs that can transmit diseases to the raccoons.[18] On average, there are about 2 different species present in each host. That is not overall abundance, but simply the absolute number of species found. Some captured raccoons had developed antibodies to certain diseases. Cats are only newly introduced on the island due to humans bringing them as pets.[18]

Conservation actions

One conservation approach would be to reduce or even eliminate human impact on the mangrove forests, especially in the northwest corner of the island.[12] This would constitute the halting of development in this area and to establish protected land for the raccoons. This land to be set aside would include the habitat that is crucial to the survival of the species, most importantly the mangrove forests and surrounding semi-evergreen forests.

Another method that could help to restore the populations is captive breeding techniques.[17] If they willingly reproduce in captivity as the common raccoons do, it could be used successfully. Additionally, the arrival of pets, especially feral cats, brought more diseases and parasites that are having a significant effect on the raccoons. The best method of reducing these impacts is to remove as many feral cats as possible. For any conservation action to be successful, conservation personnel will need to find a way to compromise with the tourism industry to save the Cozumel raccoons.[17]

Glatston also urged researchers to continue examining the species to assure that the pygmy is a distinct species from its mainland sister taxon.[17]

References

  1. ^ a b Wozencraft, W. C. (2005). "Order Carnivora". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. pp. 627–628.  
  2. ^ a b c d e Cuarón AD, de Grammont PC, Vázquez-Domínguez E, Valenzuela-Galván D, García-Vasco D, Reid F & Helgen K (2008). Procyon pygmaeus. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 2008-01-26.
  3. ^ a b Helgen, Kristofer M.; Wilson, Don E. (2005). "A Systematic and Zoogeographic Overview of the Raccoons of Mexico and Central America". In Sánchez-Cordero, Víctor; Medellín, Rodrigo A. Contribuciones mastozoológicas en homenaje a Bernardo Villa. Mexico City: Instituto de Ecología of the Universidad Nacional Autónoma de México. pp. 221–236.  
  4. ^ Zeveloff, Samuel I. (2002). Raccoons: A Natural History. Washington, D. C.: Smithsonian Books. p. 45.  
  5. ^ Helgen, Kristofer M.; Wilson, Don E. (January 2003). "Taxonomic status and conservation relevance of the raccoons (Procyon spp.) of the West Indies". Journal of Zoology (Oxford: The Zoological Society of London) 259 (1): 69–76.  
  6. ^ Hamblin, NL (1984). Animal Use by the Cozumel Maya. Tucson: The University of Arizona Press. 
  7. ^ a b c d e de Villa-Meza, A. et al. (2011). "Procyon pygmaeus (Carnivora: Procyonidae)". Mammalian Species 43 (1): 87–93.  
  8. ^ Merriam, CH (1901). "Six new mammals from Cozumel Island, Yucatan". Proceedings of the Biological Society of Washington 14: 99–104. 
  9. ^ Goldman, EA; Jackson, Hartley H. T. (1950). "Raccoons of North and Middle America". North American Fauna 60: 1–153.  
  10. ^ McFadden, K. W. (2004). "The ecology, evolution, and natural history of the endangered carnivores of Cozumel Island, Mexico.". PhD Dissertation, Columbia University, New York. 
  11. ^ a b c d e McFadden KW, Sambrotto RN, Medellín RA, Gompper ME (2006). "Feeding habits of endangered pygmy raccoons (Procyon pygmaeus) based on stable isotope and fecal analyses.". J Mammal 87: 501–509.  
  12. ^ a b c d McFadden, K.W., D. García-Vasco, A. D. Cuarón, D. Valenzuela-Galván, R. A. Medellín, and M. E. Gompper (2009). "Vulnerable island carnivores: the endangered endemic dwarf procyonids from Cozumel Island.". Biodiversity Conservation. Online. 
  13. ^ a b c d e f Cuaron, A.D., Martinez-Morales M.A., McFadden K.W., Valenzuela D., Gompper M.E. (2004). "The status of dwarf carnivores on Cozumel Island, Mexico". Biodivers Conserv 13: 317–331.  
  14. ^ a b Alcover, J.A. and M. McMinn. (1994). "Predators of vertebrates on islands". BioScience 44 (1): 12–18.  
  15. ^ Cuarón, A. D., et al. (2009). "Conservation of the endemic dwarf carnivores of Cozumel Island, Mexico". Small Carnivore Conservation 41 (1): 15–21. 
  16. ^ Lotze, J.-H. & Anderson, S. (1979). "Procyon lotor". Mammalian Species 119: 1–8.  
  17. ^ a b c d e f Glatston, A.R. (Ed.). (1994). "The red panda, olingos, coatis, raccoons, and their relatives: status survey and conservation action plan for procyonids and ailurids". Gland, Switzerland: IUCN (World Conservation Union). 
  18. ^ a b c McFadden, K.W., Wade, S.E., Dubovi, E.J., and Gompper, M.E. (2005). "A serology and fecal parsitology survey of the critically endangered pygmy raccoon (Procyon pygmaeus).". J Wildlife Diseases 41: 615–617.  
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.