César A. Ríos-Muñoz’s research while affiliated with National Autonomous University of Mexico and other places

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Publications (11)


Distribución geográfica y caracterización del hábitat de la familia Trochilidae (Aves) en el estado de Guerrero, México
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March 2016

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973 Reads

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12 Citations

Revista de Biologia Tropical

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Abstract: Geographical distribution and habitat characterization of the Trochillidae family (Birds) in the state of Guerrero, Mexico. The distribution and abundance of species of the Trochillidae family is usually influenced by the flowering and phenology of plants used by them as a feeding source, mainly in primary forest, so that changes in vegetation cover could represent affectations in their populations. We analyzed and characterized the geographical distribution and habitat for 22 species of resident hummingbirds in the state of Guerrero using the vegetation and land use maps of INEGI Series IV (2007-2010). Distribution models were generated with the Genetic Algorithm for Rule Set Production (GARP), using historical records of scientific collections and fieldwork (2001-2009), in combination with climatic and topographic variables. Of the 22 modeled species, six are endemic to Mexico, the same number of species found in a risk category. The highest concentration with regards to richness, endemism and number of threatened species of hummingbirds occurs in the biotic province of the Sierra Madre del Sur. However, the hypothetical distribution of most of the hummingbirds occurs in disturbed sites or agroecosystems as a result of changes in land-use. For Campylopterus hemileucurus , Lamprolaima rhami y Heliomaster longisrostris , their hypothetical distribution is highest in areas of primary vegetation. The areas of highest concentration of hummingbirds do not coincide with the Areas of Importance for the Conservation of Birds in Guerrero, considering that, despite its diversity and its extreme popularity among human beings, from the conservation perspective hummingbirds have received relatively little attention.


Geographical distribution and habitat of Trochilidae (Aves) in the state of Guerrero, Mexico

March 2016

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87 Reads

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1 Citation

Revista de Biologia Tropical

The distribution and abundance of species of Trochillidae family is usually influenced by the flowering and phenology of plants used as a feeding source, mainly in primary forest, so that changes in vegetation cover could impact their populations. We analyzed and characterized the geographical distribution and habitat for 22 species of resident hummingbirds in the state of Guerrero using the vegetation and the land use map of INEGI Series IV (2007-2010). Distribution models were generated with the Genetic Algorithm for Rule Set Production (GARP), using historical records of scientific collections and fieldwork (2001-2009), in combination with climatic and topographic variables. Of the 22 modeled species, six are endemic to Mexico, the same number of species found in a risk category. The highest concentration with regards to richness (14-20 species), endemism (5-6 species) and number of threatened species of hummingbirds (5-6 species) occurred in the biotic province of Sierra Madre del Sur. However, the potential distribution of most of the hummingbirds occurred in disturbed sites or agroecosystems, as a result of changes in land-use. For Campylopterus hemileucurus, Lamprolahna rhatni and Heliomaster longisrostris, their potential distribution was highest in areas of primary vegetation. Areas of high hummingbirds presence do not coincide with the Important Bird Areas proposed for bird conservation in Guerrero, considering that, despite its diversity and its extreme popularity, from the conservation perspective hummingbirds have received relatively little attention.


Figure 1 Ventral, lateral and dorsal views of two Elaenia frantzii. Panels (A-E) a specimen of E. f. frantzii collected in Costa Rica (AMNH: Birds:07902: Table 1). Panels (F-J) a specimen of E. frantzii collected in Chiapas, México (MZFC:26000). Note the pronounced darker coloration of the Chiapas specimen, especially in the dorsal and lateral views. 
Figure 2 Principal components plot of environmental parameters at sites of Elaenia frantzii records. Green squares: E. frantzii browni of extreme northern South America; orange triangles: E. f. frantzii of Costa Rica and Panama; blue circles: E. frantzii pudica of northern South America; green circles: E. f. ultima of northern Central America; red square: new E. frantzii record from Chiapas, México. 
Figure 3 Distribution map of Elaenia frantzii with suitability values displayed geographically. Gray shading indicates the geography of the suitability values predicted by the Maxent model. Darker shades indicate areas with higher suitability while lighter shades denote areas with lower suitability. We have mapped E. frantzii records on top of the suitability predictions and color-coded them by subspecies. The red square indicates the site of the new records in Chiapas, Mexico.
Phylogenetic and morphologic evidence confirm the presence of a new montane cloud forest associated bird species in Mexico, the Mountain Elaenia (Elaenia frantzii; Aves: Passeriformes: Tyrannidae)
  • Article
  • Full-text available

November 2015

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109 Reads

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2 Citations

We here provide evidence to support an extension of the recognized distributional range of the Mountain Elaenia (Elaenia frantzii) to include southern Mexico. We collected two specimens in breeding condition in northwestern Sierra Norte de Chiapas, Mexico. Morphologic and genetic evidence support their identity as Elaenia frantzii. We compared environmental parameters of records across the entire geographic range of the species to those at the northern Chiapas survey site and found no climatic differences among localities.

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Figure 3 Distribution map of Elaenia frantzii with suitability values displayed geographically. Gray shading indicates the geography of the suitability values predicted by the Maxent model. Darker shades indicate areas with higher suitability while lighter shades denote areas with lower suitability. We have mapped E. frantzii records on top of the suitability predictions and color-coded them by subspecies. The red square indicates the site of the new records in Chiapas, Mexico. 
Phylogenetic and morphologic evidence confirm the presence of a new montane cloud forest associated bird species in Mexico, the Mountain Elaenia (Elaenia frantzii; Aves: Passeriformes: Tyrannidae)

November 2015

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88 Reads

We here provide evidence to support an extension of the recognized distributional range of the Mountain Elaenia (Elaenia frantzii) to include southern Mexico. We collected two specimens in breeding condition in northwestern Sierra Norte de Chiapas, Mexico. Morphologic and genetic evidence support their identity as Elaenia frantzii. We compared environmental parameters of records across the entire geographic range of the species to those at the northern Chiapas survey site and found no climatic differences among localities.


Figura 1. Mapa de registros del ratón casero (Mus musculus) en Isla Socorro, México. El círculo blanco y los cuadros grises muestran localidades de nuestros registros: 1) Base naval, 2) Las Mandarinas, 3) Camino al Evermann, 4) Playa Norte. El círculo negro representa el registro reportado por Brattstrom (1990): 5) Caleta de Grayson. El área sombreada gris representa el radio de 2 km alrededor del sector naval.
A little big problem: new records of the house mouse in Socorro Island, Mexico

January 2014

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59 Reads

ACTA ZOOLÓGICA MEXICANA (N S )

We report new records of the house mouse (Mus musculus) collected in Socorro Island, in the Mexican Pacific Ocean. These records contribute to extend the knowledge about the present range and possible causes of the presence of the species in different localities in the island.


Biogeographic regionalization of the mammals of tropical evergreen forests in Mesoamerica

June 2013

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192 Reads

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3 Citations

Revista de Biologia Tropical

Mesoamerica is a biologically complex zone that expands from Southern Mexico to extreme Northern Colombia. The biogeographical patterns and relationships of the mammalian fauna associated to the Mesoamerican Tropical Evergreen Forest (MTEF) are poorly understood, in spite of the wide distribution of this kind of habitat in the region. We compiled a complete georeferenced database of mammalian species distributed in the MTEF of specimens from museum collections and scientific literature. This database was used to create potential distribution maps through the use of environmental niche models (ENMs) by using the Genetic Algorithm for Rule-Set Production (GARP) using 22 climatic and topographic layers. Each map was used as a representation of the geographic distribution of the species and all available maps were summed to obtain general patterns of species richness in the region. Also, the maps were used to construct a presence-absence matrix in a grid of squares of 0.5 degrees of side, that was analyzed in a Parsimony Analysis of Endemicity (PAE), which resulted in a hypothesis of the biogeographic scheme in the region. We compiled a total of 41 527 records of 233 species of mammals associated to the MTEF. The maximum concentration of species richness (104-138 species) is located in the areas around the Isthmus of Tehuantepec, Northeastern Chiapas-Western Guatemala, Western Honduras, Central Nicaragua to Northwestern Costa Rica and Western Panama. The proposed regionalization indicates that mammalian faunas associated to these forests are composed of two main groups that are divided by the Isthmus of Tehuantepec in Oaxaca in: a) a Northern group that includes Sierra Madre of Chiapas-Guatemala and Yucatan Peninsula; and b) an austral group, that contains the Pacific slope of Chiapas towards the South including Central America. Some individual phylogenetic studies of mammal species in the region support the relationships between the areas of endemism proposed, which suggest a common biogeographical history. In spite that Mesoamerica is considered one of the most important hotspots for biological conservation, the poor knowledge of the biogeographic patterns, the scarcity of protected areas, and the high rate of habitat transformation due to human activities, make prioritary the development of conservation strategies that include patterns of species richness, endemism, and mammalian associations.


POTENTIAL AREAS OF RICHNESS, ENDEMISM AND CONSERVATION OF THE BIRDS OF QUERETARO STATE, MEXICO

January 2013

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54 Reads

Interciencia

The distribution of bird species in the Mexican state of Queretaro was analyzed, based on the determination of potential distribution areas using ecological niche modeling. The potential distributions were also used to define areas of endemism for the birds in the state, applying a parsimony analysis of endemicity, and the protective effectiveness of core areas within the Sierra Gorda Biosphere Reserve (RBSG) was evaluated. Presence data points for 376 species of birds across the state, obtained from scientific collections, the literature and field work, were used in the analyzes. The potential distribution of species richness, endemism and threatened species showed the highest concentration in the bio-geographical province of Sierra Madre Oriental. Although there are areas in the south of the state that have a large number of species, they have not been sufficiently evaluated in terms of their conservation. The identification of areas of endemism revealed two major groups: 1) the northern region of the eastern slope of the Sierra Madre Oriental, characterized by humid climates; and 2) the areas that correspond to the western slope of the Sierra Madre Oriental, the Mexican Plateau and the Transmexican Volcanie Belt, characterized by dry and temperate climates and medium-low moisture. On the other hand, the results demonstrated that the core zones within the RBSG are not covered effectively in order to protect areas with a high hypothetical concentrations of species, including the endemic and threatened birds.


Figura 1. Mapas digitalizados con los escenarios de cambio de uso de suelo en 3 décadas. a) 1970; b) 1980; c) 1990. Las áreas modificadas antropogénicamente están representadas en gris y se sobreponen los registros puntuales de T. episcopus correspondientes a cada década, que se denotan con círculos negros (●); d) registros puntuales de T. episcopus para México: datos del Atlas de las aves de México (Navarro et al. 2003), cuadros grises (£); registros de la AKN (2009), triángulos negros (5); registros obtenidos en el trabajo de campo de este estudio, círculos (8).  
The geographical distribution of the Blue-gray Tanager (Thraupis episcopus) through anthropogenically modified habitats in Mexico

September 2011

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130 Reads

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2 Citations

REVISTA MEXICANA DE BIODIVERSIDAD

We analyzed the historical and current distributional range data of the Blue-gray Tanager, and reported new nesting records in northeastern Mexico. We also assessed the range extension of this species into human-altered habitats in the Yucatan Peninsula and northeastern Mexico, based both on records from fieldwork and biological databases. We identified habitat preference (conserved vs. human altered) using land use change scenarios from 3 decades (1970, 1980, and 1990) and percentages of occurrence in a multitemporal approach, finding no significant differences in habitat use through time.


Distribución de Taxus globosa (Taxaceae) en México: Modelos ecológicos de nicho, efectos del cambio del uso de suelo y conservación

January 2010

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207 Reads

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62 Citations

Revista Chilena de Historia Natural

Taxus globosa is a gymnosperm inhabiting Mexican and northern Central American temperate forests, and it has been considered as threatened by Mexican and international conservancy agencies. In Mexico, habitat loss is one of the main threats for most of the cloud forest species including this taxon, being human-induced land use change a key issue. We obtained the potential distribution of this species through Maxent algorithm based on 73 herbarium records. Also the modification of vegetation cover for three time periods (1976, 1996 y 2000) was analyzed upon the potential distribution of this species. The known and potential geographical distribution was evaluated in relation to the current Mexican National System of Natural Protected Areas at federal level (ANPs) and Mexican Priority Regions for Conservation (RTPs), in order to determine the role of these areas in its conservation and management. Potential distribution models show an important reduction (until 84 %) of the distribution area related with land use change. This species is scarcely represented in the ANPs, because less than 10 % of its potential distribution occurs within these areas of federal protection. This approach represents an important tool in biogeography and conservation, as well as in other areas of biology, due to its predictive ability. Our results highlight the urgency to preserve the remaining Mexican temperate forest patches, mainly cloud forest ones, to guarantee the existence of this species.



Citations (5)


... Uno de los criterios para evaluar si los registros novedosos (aquellos más allá de su distribución conocida) son ambientalmente importantes, es analizar si (Sánchez-González, 2013). Por eso se llevó a cabo una descripción del perfil bioclimático a partir de los registros totales compilados de la especie, en combinación con 19 variables bioclimáticas (tabla 1) obtenidas del proyecto Worldclim a una resolución espacial de 30 segundos (≈ 1 km²) (Hanna et al., 2016;Hijmans et al., 2005). Con ayuda del SIG (Arcview 3.3; ESRI, 1999) se extrajeron los valores de cada una de las variables climáticas correspondientes con cada registro de la especie y mediante un análisis de componentes principales (ACP) realizado en PAST (Hammer et al., 2001), se analizaron e identificaron a aquellos registros ambientalmente novedosos, con base en la distancia en el espacio ambiental que guardaron con relación a los registros históricamente conocidos ( fig. 4). ...

Reference:

Análisis del conocimiento histórico de la distribución geográfica y ecológica del loro frente blanca, Amazona albifrons, con evidencia de colonización reciente
Phylogenetic and morphologic evidence confirm the presence of a new montane cloud forest associated bird species in Mexico, the Mountain Elaenia (Elaenia frantzii; Aves: Passeriformes: Tyrannidae)

... Even where land cover or use have not been explicitly incorporated into deductive or inductive modelling of species distributions, habitat-based modelling can still provide Species Accounts by combining remote sensing with best-available mapping of species' distributions (Barrows et al., 2008, Rios-Munoz and Navarro-Siguenza, 2009, Soberon and Peterson, 2009. This requires being able to map change in the overall condition (or 'intactness') of habitat collectively for a whole group of species, or for species-level biodiversity in general, rather than separately for each species. ...

Effects of land use change on the hypothetical habitat availability for Mexican parrots.
  • Citing Article
  • January 2009

Ornitología Neotropical

... This species distribution area is equivalent to 1.82% of the national territory, suggesting it could be assigned to a risk category considering the precautionary principle, which states that where there are threats of irreversible damage, and lack of scientific certainty shall not be used as a reason for postponing conservation actions (United Nations, 1992). Therefore, based on its restricted distribution, population decline, and vulnerability to climate and land-use change (Prieto-Torres et al., 2021;Sierra-Morales et al., 2016), P. mexicanus could be categorized as NT and Pr (Subject to Special Protection) according to the IUCN and the NOM, respectively. ...

Distribución geográfica y caracterización del hábitat de la familia Trochilidae (Aves) en el estado de Guerrero, México
  • Citing Article
  • March 2016

Revista de Biologia Tropical

... Tanagers (Passeriformes: Thraupidae) stand as denizens of the Neotropics, spanning from Central to South America, and occur in diverse habitats, including lowland rainforests, grasslands, and high-altitude fields (Rosenberg et al. 1999;Rodríguez-Ruíz et al. 2011;Eisermann et al. 2011a;Rodrigues et al. 2019;Winkler et al. 2020;Aguiar de Souza Penha et al. 2022. Tanagers are believed to be socially monogamous, with both sexes participating in parental care, with clutch size typically ranging from 1-4 eggs and an incubation period lasting 12 to 14 days, but with a high species variation (Aguiar de Souza Penha et al. 2022. ...

The geographical distribution of the Blue-gray Tanager (Thraupis episcopus) through anthropogenically modified habitats in Mexico

REVISTA MEXICANA DE BIODIVERSIDAD

... Se utilizó el 25 % de los registros para el entrenamiento del programa y el restante como datos para la evaluación. Los parámetros utilizados para obtener dichos modelos fueron multiplicador de regularización (regularization multiplier) =1, número máximo de puntos de fondo (máximum number of background points) =10 000, límite de convergencia (convergence limit)=0,00001 y número máximo de repeticiones (máximum iterations)=500 (Phillips et al., 2006;Contreras-Medina et al., 2010). ...

Distribución de Taxus globosa (Taxaceae) en México: Modelos ecológicos de nicho, efectos del cambio del uso de suelo y conservación
  • Citing Article
  • January 2010

Revista Chilena de Historia Natural