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| Victoriano,Pedro F; Coronado,Tanía M; Ortiz,Juan Carlos. |
| The gemís Diplolaemus Bell, 1843 is a common squamate component of the Patagonian región of South América. Considerable taxonomic confusión exists within this gemís, particularly about the status of Chilean-Andean populations and the actual distribution of D. leopardinas (Werner, 1898). In an attempt to clarify the taxonomic status and distribution of Diplolaemus species, we performed a principal component analysis (PCA) and discriminant function analysis (DFA) using both standard morphometric and meristic data. Multivariate summaries of morphometric data show that most species are poorly discriminated, with the exception of D. darwinii. In contrast, a PCA analyses performed on the meristic data clearly distinguish three discrete groups: 1. D. darwinii, 2.... |
| Tipo: Journal article |
Palavras-chave: Species limits; Taxonomy; Patagonia; Polychrotidae. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100006 |
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| Díaz-Páez,Helen; Ortiz,Juan Carlos. |
| Se analizó la dieta de una población del sapito de cuatro ojos (Pleurodema thaul) de la localidad de Hualpén (Talcahuano, Chile). El estudio se realiza durante los períodos reproductivos (junio-diciembre) que comprenden los años 2000 y 2001. Estos anuros destinan una menor importancia al consumo de presas durante la época reproductiva, por lo que presentan una baja frecuencia de ocurrencia (50,63%). La dieta de P. thaul está compuesta fundamentalmente de artrópodos (IRI = 0,92), con un consumo de menor importancia de vegetales (IRI = 0,035). Se determinó una alta diversidad de ítemes de presa (37 taxa). Los ítemes alimentarios dípteros y arácnidos son los más comunes. No se detectan relaciones entre el tamaño de las presas y el tamaño de los anuros |
| Tipo: Journal article |
Palavras-chave: Dieta; Anfibia; Leptodactylidae; Chile. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100004 |
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| Vidal,Marcela A; Ortiz,Juan Carlos; Labra,Antonieta. |
| We studied sexual and geographic variation of color patterns in the lizard Liolaemus tenuis. We counted the number of scales with different colors in two body regions, in individuals of both sexes, from three groups of populations along a latitudinal range. Color patterns showed sexual and geographic variations; females and the northern group were the darkest. The selective pressures of these color pattern variations are unclear. However, considering that L. tenuis males are territorial and polygamous, we postulate that sexual variation in color would be consequence of sexual selection involving female choice and male-male interactions (e.g. agonistic displays among males). Geographic variation may be determined by predation pressure, as there is a... |
| Tipo: Journal article |
Palavras-chave: Chromatophores; Sexual dimorphism; Lizard; Liolaemus; Chile. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382007000100004 |
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