Speciation and evolution of the pygmy mice, genus Baiomys

Packard, Robert L.

doi:10.5962/bhl.part.6498

Cited by 30 publications

(25 citation statements)

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“…Comparisons between S. a. vulcani and S. a. planifrons may assess subspecific differences; however, these two samples differ more in the orofacial measurements (Mahalanobis D = 3.28) than do found within taxa between wild-caught and laboratory-bred individuals in any measurement. No sexual dimorphism was found in any ofthese measurements, a finding consistent with previous studies of these Sigmodon (Baker, 1969) and other sigmodontine rodents (Hooper, 1952;Pearson, 1958;Packard, 1960;Voss, 1988). All individuals are 100 days of age or older; while growth rates tend to be low in adults older than 100 days of age, Sigmodon continues growing until approximately 250 days of age (Baker and Shump, 1978), so there may be agerelated variation within these samples.…”

Section: Methodssupporting

confidence: 91%

Variation in Developmental Constraints in Sigmodon

Zelditch¹,

Straney²,

Swiderski³

et al. 1990

Evolution

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Developmental constraints can be interpreted as factors of developmental origin responsible for covariation among measured variables. Several hypotheses have been proposed to link the possession of such constraints to subsequent evolution. Using confirmatory factor analysis, we compare developmental factors across selected taxa of cotton rats, genus Sigmodon. Three factors explain well the covariation among orofacial measurements: (1) responses to body size variation, (1) coordinated growth of traits of the occluding-tooth complex, and (3) responses to musculoskeletal interactions. Sigmodon taxa share these factors, but differ in the variance-covariance matrix of factors, and the unique variances of individual traits. Patterns of covariation among measurements of the neurocranial complex reflect responses to body size variation, and perhaps also responses to fetal brain growth. While there are no significant differences across taxa in factorpattern, variance-covariance matrix of factors, or unique variance of measured neurocranial variables, the neurocranium is only weakly constrained. We doubt that even the relatively stronger developmental constraints on the orofacial complex would prevent evolutionary divergence because differences in the variances and covariances of factors, and in levels of unique variance of individual traits can provide different opportunities for selection to act in different Sigmodon taxa.

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Section: Methodssupporting

confidence: 91%

Variation in Developmental Constraints in Sigmodon

Zelditch¹,

Straney²,

Swiderski³

et al. 1990

Evolution

View full text Add to dashboard Cite

show abstract

“…1 found within taxa between wild-caught and laboratory-bred individuals in any measurement. No sexual dimorphism was found in any ofthese measurements, a finding consistent with previous studies of these Sigmodon (Baker, 1969) and other sigmodontine rodents (Hooper, 1952;Pearson, 1958;Packard, 1960;Voss, 1988). All individuals are 100 days of age or older; while growth rates tend to be low in adults older than 100 days of age, Sigmodon continues growing until approximately 250 days of age (Baker and Shump, 1978), so there may be agerelated variation within these samples.…”

Section: Methodssupporting

confidence: 80%

VARIATION IN DEVELOPMENTAL CONSTRAINTS IN SIGMODON

Zelditch

Straney

Swiderski³

et al. 1990

Evolution

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Abstract. -Developmental constraints can be interpreted as factors of developmental origin responsible for covariation among measured variables. Several hypotheses have been proposed to link the possession ofsuch constraints to subsequent evolution. Using confirmatory factor analysis, we compare developmental factors across selected taxa of cotton rats, genus Sigmodon. Three factors explain well the covariation among orofacial measurements: (1) responses to body size variation, (1) coordinated growth of traits of the occluding-tooth complex, and (3) responses to musculoskeletal interactions. Sigmodon taxa share these factors, but differ in the variance-covariance matrix offactors, and the unique variances of individual traits. Patterns ofcovariation among measurements of the neurocranial complex reflect responses to body size variation, and perhaps also responses to fetal brain growth. While there are no significant differences across taxa in factorpattern, variance-covariance matrix of factors, or unique variance of measured neurocranial variables, the neurocranium is only weakly constrained. We doubt that even the relatively stronger developmental constraints on the orofacial complex would prevent evolutionary divergence because differences in the variances and covariances offactors, and in levels ofunique variance ofindividual traits can provide different opportunities for selection to act in different Sigmodon taxa.

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“…Para facilitar y en su caso asegurar la determinación correcta de los integrantes de este grupo, se tomaron en cuenta los caracteres diagnósticos que permiten reconocer fácilmente a las especies, enfatizando aquéllos estados del carácter que reflejan las poblaciones de las especies que habitan la entidad. Por tanto, los atributos de los roedores considerados en el presente trabajo se derivaron a partir de los datos de las revisiones taxonómicas de las familias Geomyidae (Merriam 1895), Sciuridae (Nelson 1899;Howell 1938), de los trabajos de algunos miembros de los géneros Perognathus (Osgood 1900), Oryzomys (Merriam 1901a;Goldman 1918;Carleton y Arroyo-Cabrales 2009), Peromyscus (Osgood 1909), Neotoma (Goldman 1910;Hall y Genoways 1970), Reithrodontomys (Howell 1914;Hooper 1952), Orthogeomys (Nelson y Goldman 1930), Thomomys (Nelson y Goldman 1934), Nelsonia (Hooper 1954), Baiomys (Packard 1960), Pappogeomys (Russell 1968), Spermophilus (Helgen et al 2009), de la especie Sciurus aureogaster (Musser 1968), notas sobre faunas locales (Allen 1906;Hooper 1955;Musser 1969;Genoways y Jones 1969, 1973, estudios faunísticos regionales (Carleton 1977), monografías (Hall 1981; Villa-Ramírez y Cervantes 2003), y de guías de campo (Ceballos y Miranda 1986.…”

Section: Materials Y Métodosunclassified

Los roedores de Jalisco, México: clave de determinación

Godinez¹,

Guerrero²

2014

Therya

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Introduction:The state of Jalisco with only 4.0 % of the national area holds about 27.0 % (64 spp) of all rodent species described for Mexico. This knowledge of the richness of rodents from Jalisco is clearly known and refers only to the publications cited the presence of a taxon inside the state border. Therefore, this paper aims to propose an illustrated key to facilitate any interested person a tool that allows them to easily recognize rodent species inhabiting the state of Jalisco. It also represents an effort that seeks to contribute to a better understanding of morphological variation that is so difficult to appreciate in this group of vertebrates. Methods: The key to the identification of rodents of Jalisco was integrated based on the compilation and analysis of bibliographic information, and review of museum specimens deposited in the mammal collection of the Centro de Estudios en Zoología, Universidad de Guadalajara (CZUG). We consider first the original literature where these taxa are described, and ensure the correct identification of the members of the rodents were considered diagnostic characters allowing species easily recognize. With the purpose of facilitating the understanding and accessibility of the key to any interested and not just specialists, have been included illustrations that accompany the text in almost all expressions of character states.

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Speciation and evolution of the pygmy mice, genus Baiomys

Cited by 30 publications

References 0 publications

Variation in Developmental Constraints in Sigmodon

Variation in Developmental Constraints in Sigmodon

VARIATION IN DEVELOPMENTAL CONSTRAINTS IN SIGMODON

Los roedores de Jalisco, México: clave de determinación

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