Taxonomic Revision of<i>Thomomys bottae</i>in the Baja California Sur Lowlands

Trujano-Alvarez, Ana Lilia; Álvarez-Castañeda, Sergio Ticul

doi:10.1644/05-mamm-a-291r3.1

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…Lack of discrimination power of the models for some species could have resulted because the analysis did not include the most critical variables for the species, as in the case of S. atricapillus, that have a preference for sites with running water (AlvarezCastañeda et al 1996) and D. simulans that have a preference for habitats with deep soils, which, in turn, apparently leads to a mosaic pattern of distribution in the Magdalena Plains (25°N, 111.63°W). In other cases, as with Thomomys bottae, the result can be related to the fact that the species is not correctly represented in the data points because, under natural conditions, their presence or absence is difficult to determine since their distribution is discontinuous and at low density, as opposed to agricultural areas, where distribution is uniform and density increases (Alvarez-Castañeda and Patton 2004;Trujano-Alvarez and Alvarez-Castañeda 2007). For this reason, we suspect that this species shows 'absence' at some data points where they are probably present.…”

Section: Discussionmentioning

confidence: 99%

Physical and biological variables related to habitat preferences of rodents

Suárez-Gracida

Álvarez-Castañeda

2009

Biodivers Conserv

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This study determined habitat characteristics related to the presence of species of rodents and possible associations between pairs of these species that may affect their distribution. The study was conducted in the southern half of the Baja California Peninsula, Mexico. We used an environmentally constrained null model with 200 data sites that were sampled from 1999 to 2004 and measurements of different environmental factors obtained from electronic maps, meteorological stations, and measurements in the field. Although most of the isolated factors were not adequate for distinguishing between sites (rodents' habitat), the combination of all the factors gave an acceptable explanation for the presence of rodent species. The low selectivity of the species for the variables used in the model could be related to the selection of variables that were not appropriate for all species and because an artifact of scale of several variables was employed in the analysis. The percentage of rock cover and vegetation types was most closely related to habitat preference for most species. The possible associations between pairs of these species shown by the null model, the negative interaction between two pairs of species (Peromyscus eva vs. P. fraterculus and Chaetodipus spinatus vs. C. fallax) have probably affected the distribution of these rodents.

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Section: Discussionmentioning

confidence: 99%

Physical and biological variables related to habitat preferences of rodents

Suárez-Gracida

Álvarez-Castañeda

2009

Biodivers Conserv

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“…Morphological and genetic studies of Thomomys from the BCP lowlands show that the morphology of these gophers does not match with any geographic or genetic patterns. Furthermore, intrapopulation variation is higher within than between groups (Trujano‐Alvarez & Álvarez‐Castañeda, ).…”

Section: Taxonomic Summarymentioning

confidence: 99%

“…Based on our data, we suggest restructuring the infraspecific taxonomy to consist of four subspecies (Fig. 6), from north to south: Thomomys nigricans nigricans (clade I), distributed over southern California and the north-western BCP; Thomomys nigricans martirensis (clade II), occurring throughout the BCP highlands (Sierra Juarez and San Pedro Martir) to the Central Desert; Thomomys nigricans russeolus (clade IIIa), occurring from the Central Valley of Baja California to the Vizcaino Desert area; and Thomomys nigricans anitae (clade IIIb), distributed from north of the San Ignacio Lagoon to the southern tip of BCP (Trujano-Alvarez & Álvarez-Castañeda, 2007). Although the divergence within clade III is recent (150 200 years ago), we retained T. n. russeolus (IIIa) and T. n. anitae (IIIb) as recognizable subspecies because morphological data indicate some differentiation between them (Rios & Álvarez-Castañeda, 2007;Trujano-Alvarez & Álvarez-Castañeda, 2007), and because the genetic break between these subclades coincides with a 140 km-wide area of inimical habitat (see Fig.…”

Section: Taxonomic Summarymentioning

confidence: 99%

“…Pocket gophers in the BCP belong to the clade ‘Baja California’, and they are referred to as Thomomys anitae (Álvarez‐Castañeda, ). With the use of morphological characteristics and molecular tools, Trujano‐Alvarez & Álvarez‐Castañeda () were able to determine that populations from the southern BCP have high morphological variation, but this does not reflect genetic differentiation, except for the two clear genetic subgroups recognized as Thomomys bottae russeolus and T. b. anitae . Their subspecific recognition was based on the subspecies concept proposed by Lidicker () and Patton & Smith ().…”

Section: Introductionmentioning

confidence: 99%

“…1). However, recent phylogenetic studies based on mitochondrial DNA suggest the synonymy of several subspecies (Rios & Álvarez-Castañeda, 2007;Trujano-Alvarez & Álvarez-Castañeda, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic structure among pocket gopher populations, genusThomomys(Rodentia: Geomyidae), on the Baja California Peninsula

Trujano-Alvarez¹,

Álvarez-Castañeda²

2013

Zool J Linn Soc

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We determined the phylogenetic relationships, population history, and hierarchical structure of genetic variation in pocket gophers distributed on the Baja California Peninsula (BCP), based on extensive geographic sampling. Using a fragment of the mitochondrial gene cytochrome b (cyt b), we found three latitudinal structured geographic clades (northern, central, and southern). The northern clade occurs in the border area of the USA and the north of BCP, the central clade occurs from the peninsular highlands through the Central Desert of Baja California, and the southern clade is distributed south of the San Ignacio Lagoon. AMOVA showed that genetic variation is higher among clades (64%) than within populations (18.1%). The deepest divergence among clades is very shallow (∼300 000 years), which suggests that climatic changes during the Pleistocene or some inhospitable habitats have affected the structure of this group, rather than influences from older marine transgressions. Phylogenetic groups disclosed by our results do not coincide with the current infraspecific classification; therefore, we propose a change of epithet for BCP gophers (Thomomys nigricans) and a new subspecific taxonomic arrangement with four subspecies: Thomomys nigricans anitae, Thomomys nigricans martirensis, Thomomys nigricans nigricans, and Thomomys nigricans russeolus. © 2013 The Linnean Society of London

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Order Rodentia

Álvarez-Castañeda

2024

Mammals of North America - Volume 2

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Taxonomic Revision ofThomomys bottaein the Baja California Sur Lowlands

Cited by 11 publications

References 21 publications

Physical and biological variables related to habitat preferences of rodents

Physical and biological variables related to habitat preferences of rodents

Phylogenetic structure among pocket gopher populations, genusThomomys(Rodentia: Geomyidae), on the Baja California Peninsula

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