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Oryzomys palustris

(Un Rat?n Arrozalero)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

marsh rice rat, Mouse

Common Names in Spanish:

Un Rat?n Arrozalero, Rata-arrocera de pantano

Description

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Habitat

Typically found in a lake at a mean distance from sea level of 22 meters (74 feet).[1]

Ecology: It prefers saltwater and freshwater marshes (semi-aquatic). It may also be found in swamps and moist meadows. Uplands bordering wetlands may be important as refuges during high tides (Kruchek 2004). Able to move between adjacent islands by swimming across salt water; in Virginia, ten movements between two islands separated by 50 m and one movement between two islands separated by 300 m were documented (Forys and Dueser 1993). Nests are placed in grassy vegetation under debris , or woven in aquatic emergents a foot or more above the high water line .

Breeding may occur throughout the year, particularly early spring . Gestation lasts 21-28 days. Litter size is 4-6 (range 1-7). Several litters per year, up to six are known. Young are weaned within two weeks.

The average home range is one acre (Negus et al. 1961). This species is an effective disperser over water and a good colonizer of barrier islands (Loxterman et al. 1998). Diet includes rice and seeds of herbaceous plants . When available (in season ), arthropods make up 75% of the diet (Negus et al. 1961). It is primarily nocturnal .[2].

List of Habitats :

Taxonomy

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Synonyms

Mus palustris Harlan

Notes

Name Status: Accepted Name .

Last scrutiny: 09-Jun-2004

Analysis of cranial variation in Oryzomys by Humphrey and Setzer (1989) indicated that O. argentatus should be included in this species. Goodyear (1991) reinstated O. argentatus as a species, but this was not followed by Baker et al. (2003), and Musser and Carleton (in Wilson and Reeder 1993, 2005) cited the more thorough study by Humphrey and Setzer (1979) in not accepting argentatus as a species (though they did state that the status of argentatus merits further study using genetic techniques).

Oryzomys palustris and O. couesi formerly were considered to be conspecific (Hall 1981); they were regarded as separate species by Honacki et al. (1982), Jones et al. (1986, 1992), and Musser and Carleton (in Wilson and Reeder 1993, 2005), following Benson and Gehlbach (1979). An electrophoretic study by Schmidt and Engstrom (1994) also concluded that O. palustris and O. couesi are distinct species. The taxonomic scope of the genus Oryzomys is unsettled, as are the taxonomic limits of some of the species included in the genus Oryzomys (Musser and Carleton, in Wilson and Reeder 1993, 2005).[2].

Similar Species

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Members of the genus Oryzomys

ZipcodeZoo has pages for 46 species and subspecies in this genus:

O. albigularis (Tomes's Rice Rat) · O. alfaroi (Alfaro's Rice Rat) · O. alfaroi alfaroi (Alfaro's Rice Rat) · O. antillarum (Jamaican Rice Rat) · O. auriventer (Ecuadorean Rice Rat) · O. balneator (Peruvian Rice Rat) · O. bauri (Galapagos Rice Rat) · O. bolivaris (Bolivar Rice Rat) · O. buccinatus (Paraguayan Rice Rat) · O. capito (Large-Headed Rice Rat) · O. chapmani (Chapman's Rice Rat) · O. couesi (Coues's Rice Rat) · O. couesi aquaticus (Coues's Rice Rat) · O. couesi couesi (Coues's Rice Rat) · O. curasoae (Cura?ao Rice Rat) · O. devius (Boquete Rice Rat) · O. dimidiatus (Thomas's Rice Rat) · O. galapagoensis (Galapagos Rice Rat) · O. galapagoensis galapagoensis (Galapagos Rice Rat) · O. gorgasi (Gorgas's Rice Rat) · O. hammondi (Hammond's Rice Rat) · O. intectus (Colombian Rice Rat) · O. intermedius (Intermediate Rice Rat) · O. keaysi (Keays's Rice Rat) · O. kelloggi (Kellogg's Rice Rat) · O. lamia (Monster Rice Rat) · O. legatus (Big-Headed Rice Rat) · O. levipes (Light-Footed Rice Rat) · O. macconnelli (MacConnell's Rice Rat) · O. melanotis (Black-Eared Rice Rat) · O. nelsoni (Tres Marias Island Rice Rat) · O. nitidus (Elegant Rice Rat) · O. oniscus (Sowbug Rice Rat) · O. palustris (Marsh Rice Rat) · O. palustris natator (Marsh Rice Rat) · O. palustris palustris (Marsh Rice Rat) · O. polius (Gray Rice Rat) · O. ratticeps (Rat-Headed Rice Rat) · O. ratticeps ratticeps (Rat-Headed Rice Rat) · O. rhabdops (Striped Rice Rat) · O. rostratus (Long-Nosed Rice Rat) · O. saturatior (Cloud Forest Rice Rat) · O. subflavus (Terraced Rice Rat) · O. talamancae (Talamancan Rice Rat) · O. xantheolus (Yellowish Rice Rat) · O. yunganus (Yungas Rice Rat)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal February 29, 2008:

Identifiers

Footnotes

  1. Standard Deviation = 105.580 based on 419 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
  2. Linzey, A.V. & Hammerson, G. 2008. Oryzomys palustris. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 03 February 2012. [back]
Last Revised: 2012-07-18