Population dynamics and conservation status of the insular cavy<i>Cavia Intermedia</i>(Rodentia: Caviidae)

Salvador, Carlos Henrique; Fernandez, Fernando A. S.

doi:10.1644/07-mamm-a-0088r1.1

Cited by 18 publications

(16 citation statements)

References 24 publications

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“…The investigations of the systematic status of particular populations of Cavia should also benefit with the use of geometric morphometric techniques to determine if these populations present differences in cranial morphology or other morphological parameters (Corti et al 2006). As C. intermedia is endemic to a 10-ha island, has an average estimated population of 42 individuals (Salvador and Fernandez 2008a) and is currently cited in the Red List as "Critically Endangered" (Chapman 2008), it is imperative that we adequately understand its relationship to mainland populations in order to address conservation and management strategies.…”

Section: Resultsmentioning

confidence: 99%

A new karyotype for Cavia magna (Rodentia: Caviidae) from an estuarine island and C. aperea from adjacent mainland

2011

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We describe a new karyotype for Cavia magna Ximenez, 1980 from an estuarine island and the karyotype of Cavia aperea Erxleben, 1777 from an adjacent mainland. The species have differences in diploid number (2n), autosomal fundamental number, quantity, and distribution of heterochromatin as dissimilar distributions of the nucleolus-organizing regions (Ag-NORs). The C. aperea karyotype has a diploid number of 64 as previously reported for C. aperea and most other Cavia species. In contrast, this new C. magna karyotype exhibits a variant diploid number of 2n=62, considering that previous work reported a karyotype of 2n=64 for C. magna. The discovery of a distinct diploid number within C. magna represents the first record of intra-specific chromosomal variation in a species of Caviidae. The diploid number of 2n=62, heterochromatin quantity, Ag-NOR distributions, and inversed X chromosome from this population of C. magna are as seen in the geographically proximate (Cavia intermedia Cherem Olimpio and Ximenez; intermediate Cavy). These data provide further evidence supporting C. magna as the sister species of C. intermedia.

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Section: Resultsmentioning

confidence: 99%

A new karyotype for Cavia magna (Rodentia: Caviidae) from an estuarine island and C. aperea from adjacent mainland

2011

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“…Cavies were live‐trapped for research on Cavia intermedia behaviour (Furnari ) between November 2007 and December 2009 on Moleques do Sul Island (27°50′ S, 48°26′ W), Santa Catarina State, Brazil. For descriptions of the study site, see Furnari () and Salvador and Fernandez (). Cavies were live‐trapped in single‐door traps, individually marked with metal ear tags (National Band and Tag Company, Newport, Kentucky, USA), checked for reproductive status and subsequently released.…”

Section: Methodsmentioning

confidence: 99%

“…Cavies were live-trapped for research on Cavia intermedia behaviour (Furnari 2011) Furnari (2011) and Salvador and Fernandez (2008). Cavies were live-trapped in single-door traps, individually marked with metal ear tags (National Band and Tag Company, Newport, Kentucky, USA), checked for reproductive status and subsequently released.…”

Section: Methodsmentioning

confidence: 99%

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New findings on the origin of Cavia intermedia, one of the world's rarest mammals

Furnari

2013

Mammal Review

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Cavia intermedia, a rare species of cavy found exclusively on Moleques do Sul Island, Brazil, differs from other cavies in genetic and morphological characteristics and has been regarded as phylogenetically closest to Cavia magna. Here, I present morphological evidence for the likely origin of Cavia intermedia from an ancestor shared with Cavia magna: an external female genital organ similar in size and appearance to the male's penis. Masculinization of the female genitalia has been observed in Cavia magna but does not occur in Cavia aperea, which suggests a sister relationship between Cavia magna and Cavia intermedia.

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“…Rodents, however, also have a relatively high degree of endemism in insular faunas (AMORI et al 2009). Worldwide, islands support an enormous and largely irreplaceable heritage of rodent biological diversity and much of it is poorly studied (CEBALLOS & BROWN 1995, CARLETON & OLSON 1999, SALVADOR et al 2008.…”

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confidence: 99%

Variation in cytochrome-b haplotypes suggests a new species of Zygodontomys (Rodentia: Cricetidae) endemic to Isla Coiba, Panama

González¹,

Sawyer²,

Ávila

et al. 2010

Zoologia (Curitiba, Impr.)

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ABSTRACT. The identity of two insular populations of rodents of the nominal species, Zygodontomys brevicauda (Allen & Chapman, 1893), from the Veragua Archipelago was examined. The mitochondrial cytochrome-b gene was sequenced from specimens collected on Isla Coiba (n = 10), Isla Cébaco (n = 3) and on the nearby Peninsula Azuero (n = 3) in Panama and compared with sequences of Z. brevicauda and a number of other related species from GenBank. For Panama, phylogenetic analyses identified two clades within Zygodontomys Allen, 1897; one representing Isla Coiba and another clade composed of rats from Isla Cébaco and from the mainland on the Peninsula Azuero, as well as a GenBank sequence of Z. brevicauda from Venezuela. We suggest that the population from Isla Coiba may represent a previously undescribed species of sigmodontine rodent that is endemic to this Pacific Island.

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Population dynamics and conservation status of the insular cavyCavia Intermedia(Rodentia: Caviidae)

Cited by 18 publications

References 24 publications

A new karyotype for Cavia magna (Rodentia: Caviidae) from an estuarine island and C. aperea from adjacent mainland

A new karyotype for Cavia magna (Rodentia: Caviidae) from an estuarine island and C. aperea from adjacent mainland

New findings on the origin of Cavia intermedia, one of the world's rarest mammals

Variation in cytochrome-b haplotypes suggests a new species of Zygodontomys (Rodentia: Cricetidae) endemic to Isla Coiba, Panama

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