Limits...
Loss of genetic diversity among ocelots in the United States during the 20th century linked to human induced population reductions.

Janecka JE, Tewes ME, Laack L, Caso A, Grassman LI, Honeycutt RL - PLoS ONE (2014)

Bottom Line: The second extant population inhabiting private lands in Willacy County retained higher levels of genetic diversity through the 1990s, but subsequently lost diversity over the next decade.A similar pattern was observed for autosomal microsatellite loci.At this time, the best means of mitigating the continued erosion of genetic variation are translocation of individuals either from larger populations in Mexico to Texas, or between the Texas populations.

View Article: PubMed Central - PubMed

Affiliation: Caesar Kleberg Wildlife Research Institute, Texas A & M University-Kingsville, Kingsville, Texas, United States of America.

ABSTRACT
Ocelots (Leopardus pardalis) in the United States currently exhibit low levels of genetic diversity. One hypothesis for this observation is that habitat fragmentation, resulting from human induced changes in the landscape during the 20(th) century, created island populations with highly reduced gene flow and increased genetic drift and inbreeding. In an effort to investigate this, we used a portion of the mitochondrial control region and 11 autosomal microsatellite loci to examine historical levels of genetic diversity and infer temporal changes in ocelot populations between 1853 and 2005. Levels of genetic diversity were higher in historical ocelot populations than in extant populations from Texas. The earliest documented loss of mitochondrial haplotype diversity occurred at Laguna Atascosa National Wildlife Refuge. The second extant population inhabiting private lands in Willacy County retained higher levels of genetic diversity through the 1990s, but subsequently lost diversity over the next decade. A similar pattern was observed for autosomal microsatellite loci. This supports the argument that low levels of genetic diversity in Texas are related to human induced population reductions and fragmentation, both of which threaten the remaining ocelots in the United States. At this time, the best means of mitigating the continued erosion of genetic variation are translocation of individuals either from larger populations in Mexico to Texas, or between the Texas populations.

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Related in: MedlinePlus

Map showing primary localities examined during this study, the dates samples were collected, and the number of samples.Contemporary populations are identified with solid dots and the localities where museum specimens originated are underlined and marked with a star.
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pone-0089384-g001: Map showing primary localities examined during this study, the dates samples were collected, and the number of samples.Contemporary populations are identified with solid dots and the localities where museum specimens originated are underlined and marked with a star.

Mentions: Museum samples (n = 15) used in this study were generously provided by the National Museum of Natural History (NMNH) of the Smithsonian Institution. Museum accession numbers and information available on the specimens sampled are provided in the Table S1. The historical samples were from the following locations: (1) Brownsville, Texas (1890–1892, n = 5, A0044601, A0044604, A0044605, A46491, and A0046119); (2) Angleton, Texas (1907, n = 2, 150363 and 150364); (3) Raymondville, Texas (1935, n = 1, 251587); (4) Kingsville, Texas (1956, n = 2, 287771 and 287774); (5) Matamoros, Tamaulipas, Mexico (1853, n = 1, A1364); (6) Perez, Veracruz, Mexico (1893, n = 2, 132522 and 132524); and (7) Soto la Marina, Tamaulipas, Mexico (1902, n = 2, 125716 and 125717) (Fig. 1).


Loss of genetic diversity among ocelots in the United States during the 20th century linked to human induced population reductions.

Janecka JE, Tewes ME, Laack L, Caso A, Grassman LI, Honeycutt RL - PLoS ONE (2014)

Map showing primary localities examined during this study, the dates samples were collected, and the number of samples.Contemporary populations are identified with solid dots and the localities where museum specimens originated are underlined and marked with a star.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3935880&req=5

pone-0089384-g001: Map showing primary localities examined during this study, the dates samples were collected, and the number of samples.Contemporary populations are identified with solid dots and the localities where museum specimens originated are underlined and marked with a star.
Mentions: Museum samples (n = 15) used in this study were generously provided by the National Museum of Natural History (NMNH) of the Smithsonian Institution. Museum accession numbers and information available on the specimens sampled are provided in the Table S1. The historical samples were from the following locations: (1) Brownsville, Texas (1890–1892, n = 5, A0044601, A0044604, A0044605, A46491, and A0046119); (2) Angleton, Texas (1907, n = 2, 150363 and 150364); (3) Raymondville, Texas (1935, n = 1, 251587); (4) Kingsville, Texas (1956, n = 2, 287771 and 287774); (5) Matamoros, Tamaulipas, Mexico (1853, n = 1, A1364); (6) Perez, Veracruz, Mexico (1893, n = 2, 132522 and 132524); and (7) Soto la Marina, Tamaulipas, Mexico (1902, n = 2, 125716 and 125717) (Fig. 1).

Bottom Line: The second extant population inhabiting private lands in Willacy County retained higher levels of genetic diversity through the 1990s, but subsequently lost diversity over the next decade.A similar pattern was observed for autosomal microsatellite loci.At this time, the best means of mitigating the continued erosion of genetic variation are translocation of individuals either from larger populations in Mexico to Texas, or between the Texas populations.

View Article: PubMed Central - PubMed

Affiliation: Caesar Kleberg Wildlife Research Institute, Texas A & M University-Kingsville, Kingsville, Texas, United States of America.

ABSTRACT
Ocelots (Leopardus pardalis) in the United States currently exhibit low levels of genetic diversity. One hypothesis for this observation is that habitat fragmentation, resulting from human induced changes in the landscape during the 20(th) century, created island populations with highly reduced gene flow and increased genetic drift and inbreeding. In an effort to investigate this, we used a portion of the mitochondrial control region and 11 autosomal microsatellite loci to examine historical levels of genetic diversity and infer temporal changes in ocelot populations between 1853 and 2005. Levels of genetic diversity were higher in historical ocelot populations than in extant populations from Texas. The earliest documented loss of mitochondrial haplotype diversity occurred at Laguna Atascosa National Wildlife Refuge. The second extant population inhabiting private lands in Willacy County retained higher levels of genetic diversity through the 1990s, but subsequently lost diversity over the next decade. A similar pattern was observed for autosomal microsatellite loci. This supports the argument that low levels of genetic diversity in Texas are related to human induced population reductions and fragmentation, both of which threaten the remaining ocelots in the United States. At this time, the best means of mitigating the continued erosion of genetic variation are translocation of individuals either from larger populations in Mexico to Texas, or between the Texas populations.

Show MeSH
Related in: MedlinePlus