| 词条 | Greater guinea pig |
| 释义 |
| name = Greater guinea pig | image = Cavia magna (Wroclaw zoo).JPG | status = LC | status_system = iucn3.1 | status_ref = [1] | taxon = Cavia magna | authority = Ximenez et al., 1980 [2] | range_map = Cavia magna map.svg }} The greater guinea pig, Cavia magna, is a species of rodent found in the coastal strip of Brazil and Uruguay, where it lives in moist grassland and marshes. DescriptionA large rodent, the greater guinea pig grows to a total length of {{convert|310|mm|in|1|abbr=on}} and weight of {{convert|636|g|oz|1|abbr=on}} for males and a total length of {{convert|303|mm|in|1|abbr=on}} and weight of {{convert|537|g|oz|1|abbr=on}} for females. The dorsal fur is dark agouti brown and the underparts are reddish brown.[3] It is semiaquatic and has membranes joining the toes.[4] Its karyotype has 2n = 64 and FN = 128.[2] Distribution and habitatThis species is native to the coastal strip of land in eastern Uruguay and southeastern Brazil. Its typical habitat is moist grassland, marshes,[4] the edges of woodland and small valleys.[1] BehaviourThe greater guinea pig is a herbivore. It is a solitary animal and has a complex network of tunnels and runways through the vegetation. The home range is variable and seems to be related to the animal's size, its sex, and the water level in the area. Females seem capable of breeding at any time of year but births predominate in spring and the early part of summer. Females may have up to three litters in one year. The gestation period is about 64 days and the litter size is very small (1 or 2 pups). The young are quite large when born and grow fast, and some females born in the spring themselves breed successfully when between 30 and 45 days old.[4] This small mammal is unusual in that it produces a small number of precocial offspring with a high survival rate when it might have been expected to produce large litters of altricial young.[5] StatusThe International Union for Conservation of Nature has rated the conservation status of the greater guinea pig as being of "least concern". It has a restricted range but has a total area of occupancy of more than {{convert|20000|km2|0}}. It is believed to have a large total population, and although the population is thought to be slightly declining in Uruguay, this is not at a rate sufficiently significant for it to be listed in a more threatened category.[1] References1. ^1 2 {{IUCN2014.2|assessor=Gonzalez, E.|assessor2=Lessa, E.|last-assessor-amp=yes|year=2008 |id=4066 |title=Cavia magna|downloaded=11 August 2015}} 2. ^1 {{MSW3 Hystricognathi | id = 13400180 | page = 1553}} 3. ^{{cite book|author1=John F. Eisenberg|author2=Kent H. Redford|title=Mammals of the Neotropics, Volume 3: Ecuador, Bolivia, Brazil|url=https://books.google.com/books?id=p2MDAzCeQQoC&pg=PA456|date=15 May 2000|publisher=University of Chicago Press|isbn=978-0-226-19542-1|page=456}} 4. ^1 2 {{cite book|author1=James L. Patton|author2=Ulyses F. J. Pardiñas|author3=Guillermo D'Elía|title=Mammals of South America, Volume 2: Rodents|url=https://books.google.com/books?id=mbjnBgAAQBAJ&pg=PA699 |year=2015 |publisher=University of Chicago Press |isbn=978-0-226-16960-6 |pages=699–}} 5. ^Kraus, C. et al. 2005. Living slow and dying young? Life-history strategy and age-specific survival rates in a precocial small mammal. In: Journal of Animal Ecology 74:171–180
External links
6 : Guinea pigs|Mammals of Brazil|Mammals of Uruguay|Rodents of South America|Environment of Rio Grande do Sul|Mammals described in 1980 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。