Sergio Ticul Alvarez-Castañeda

Sergio Ticul Alvarez-Castañeda
Centro de Investigaciones Biológicas del Noroeste | CIBNOR

Ph D

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459
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Publications

Publications (459)
Article
Species can coexist spatially and temporally by partitioning the niche space and forming complex assemblages made up of different species that share the prey resource. Chiroptera is the second most species-rich mammalian order and about 75% of bat species feed on arthropods, which makes these bats a good model group for studying complex trophic int...
Article
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Global climate change occurs from both natural and anthropic causes. Anthropic climate change has effects at various scales and occurs faster than the adaptation of species to these changes. Protected natural areas have been created to preserve species from the different threats facing them. Sierra La Laguna is a sky island with almost no anthropic...
Article
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Shared phylogenetic breaks often are associated with clear geographic barriers but some common phylogeographic breaks may lack obvious underlying mechanisms. A phylogenetic break involving multiple taxa was found in the Baja California Peninsula that was associated with a past sea barrier. However, geological evidence is lacking for this barrier’s...
Article
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Peromyscus fraterculus (Miller, 1892) is a small rodent commonly called the northern Baja deermouse. Its pelage is dark, the tail is considerably longer than the body, and the number of caudal vertebrae ranges from 30 to 34. The geographic distribution of P. fraterculus includes the area west of the Colorado River, from southern California in the U...
Article
Sky islands are unique systems composed of well-defined biotic communities established along an elevation gradient. Habitat restrictions associated to climate change make the species vulnerable. This study aimed to forecast the changes in the distribution patterns, altitude and the slope effect in selected plant and vertebrate species inhabiting th...
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Scapanus latimanus is a species with many morphological differences among its populations. This variation is associated with multiple taxonomic changes at the species or subspecies level. This study incorporates genetic analyses and comparisons with previous morphological studies to propose a better understanding of the latimanus complex. Mitochond...
Conference Paper
Mexico has the presence of ten species of kangaroo rat, of which four are endemic. Dipodomys gravipes, is endemic to the San Quintín plains in northwestern Mexico. This has recently been rediscovered after 32 years without records. The main objective of the work was to determine the existence of suitable habitats and sites with possible presence of...
Article
Notiosorex is the only genus of shrews in North America with particular adaptations for arid habitats such as deserts. Five species currently are recognized in the genus, one of which, Notiosorex evotis, lives in deciduous rain forest from northern Sinaloa to the state of Jalisco in Mexico. Notiosorex evotis originally was described as a subspecies...
Article
Introduction: In recent years has been an increase in emerging and re-emerging viral infectious diseases. Those are a great challenge for public health; one of them is Ebola, a viral hemorrhagic fever. It is natural hosts and carriers are several species of mammals of the order Chiroptera, Primates, Artiodactyla, and Rodentia, and in the southeast...
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Desert shrews of the genus Notiosorex comprise four species with morphological characteristics that are difficult to distinguish among the species. Indeed, N. cockrumi was described using only genetic markers. Based on molecular divergence documented in N. crawfordi, we hypothesize that a fifth species is present in the Baja California peninsula. G...
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Se reflexiona sobre los posibles efectos de la enfermedad COVID-19 en la educación, la investigación y el desarrollo tecnológico, en particular, en el proceso de docencia. La enseñanza de las ciencias biológicas y sus áreas de conocimiento, como la mastozoología, ecología, entre otros, se aborda bajo el esquema de dos componentes centrales. El prim...
Article
In coastal systems, concentrations of trace metals in filter feeders such as shellfish may be affected by anthropogenic activities, including agriculture and aquaculture. Shellfish are a good source of iron, but can also be a potential source of toxic elements, such as cadmium and lead, when consumed by humans. The objective of this study was to de...
Article
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Dipodomys gravipes is distributed only in the San Quintin plains, in the northwest of the peninsula of Baja California, México; this species is known to prefer flat areas and undisturbed sites. The San Quintin region has experienced accelerated agricultural development over the past 20 years, diminishing the populations of D. gravipes, which is lis...
Article
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Adaptation and evolution of terrestrial vertebrates inhabiting islands have been the topic of many studies, particularly those seeking to identify trends or patterns in body size in mammals, albeit not necessarily in shape, in relation to mainland populations. The spiny pocket mouse, Chaetodipus spinatus, is distributed in the Baja California penin...
Article
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The Systematic Collections Committee of the American Society of Mammalogists advises curators and other personnel affiliated with natural history collections in matters relating to administration, curation, and accreditation of mammal specimens and their associated data. The Systematic Collections Committee also maintains a list of curatorial stand...
Chapter
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DNA sequences from the mitochondrial cytochrome-b gene representing 529 Pero-myscus truei (pinyon mouse) from throughout the entire species range and including nine of the 11 recognized subspecies were evaluated. In addition, intron 7 of the fibrinogen beta chain (Fgb) gene was sequenced from 48 individuals. Phylogenetic analyses of mtDNA sequences...
Chapter
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Morphometric and molecular variation among specimens of Peromyscus guatemalensis were grouped into four pooled samples representing separate physiographic regions in Mexico and Guatemala. Mitochondrial sequence data identified three well-supported and reciprocally monophyletic clades. Specimens assigned to P. guatemalensis by current taxonomy also...
Article
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Some rodents of the family Heteromyidae can survive without drinking water, as they obtain it from food. All these species have in common that they eat seeds and fruits. The content of trace metals in food varies depending on the local geology and anthropogenic activities. Baja California Sur has mineral deposits that have been exploited; thus, the...
Article
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An outbreak of a highly lethal hemorrhagic fever, caused by an Arenavirus whose reservoir was Peromyscus mexicanus, occurred in the state of Chiapas, Mexico, in June 1967. In order to determine whether any Arenavirus is nowadays present in the same region of the state of Chiapas (municipalities of Ocozocoautla de Espinosa and Berriozábal), we surve...
Article
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The American Society of Mammalogy (ASM) was established in 1919 and today has members from 88 countries. Throughout its history, the different presidents and committees have implemented various strategies to extend the ASM interaction with researchers from other countries. In this chapter, we analyze the contributions that the ASM has made to the i...
Article
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Prioritizing biodiversity conservation strategies is urgently needed. Surrogate species have been used for that purpose as a means to lower costs/effort to assess representation of other species important for conservation planning. Such strategy should include multiple species and habitats within a given landscape or geographic area. The use of sur...
Article
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Nuclear and mitochondrial genomes coexist within cells but are subject to different tempos and modes of evolution. Evolutionary forces such as drift, mutation, selection, and migration are expected to play fundamental roles in the origin and maintenance of diverged populations; however, divergence may lag between genomes subject to different modes...
Article
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Over recent decades, dispersal and philopatry in natural populations have been addressed together. However, philopatry, or the tendency of an individual to remain in its birthplace, has received little attention, despite the fact that this trait is present in a considerable number of vertebrates. In this paper we discuss hypotheses that state philo...
Article
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As a periodic assessment of the mammal collection resource, the Systematic Collections Committee (SCC) of the American Society of Mammalogists undertakes decadal surveys of the collections held in the Western Hemisphere. The SCC surveyed 429 collections and compiled a directory of 395 active collections containing 5,275,155 catalogued specimens. Ov...
Article
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The desert shrew Notiosorex crawfordi is the smallest mammal in the arid and semiarid areas of North America. It displays ecological adaptations that allow it to colonize environments inhospitable for other species in the Order Soricomorpha. Little is known about the natural history of this species; hence, this work reports the characteristics of f...
Article
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In this study, we investigate the geographic distribution of the Tule shrew ( Sorex ornatus juncensis ), an endemic subspecies of the San Quintin plains associated with coastal vegetation. Records on this shrew are scarce; herein, we provide knowledge about its current conservation status and report the presence of one Tule shrew specimen, somethin...
Article
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Arthropods are the primary dietary constituents of species of the genus Myotis. The genus comprises 3 ecomorphotypes of polyphyletic origin, each associated with a different foraging strategy: aerial, trawling, and gleaning, related to the subgenera Selysius, Leuconoe, and Myotis, respectively. We explored the extent to which differences in diet ch...
Article
Previous research shows little haplotype diversity in small geographic areas, such as islands and areas where physical barriers interrupt gene flow. The general pattern is the presence of a small number of haplotypes spread across sampling sites. Instead, this paper reports the presence of a large number of haplotypes (Cytb and COI) in the extremel...
Article
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Vernacular names are important to know the characteristics of an organism, and are essential to improve the exchange of information between academic and non-academic areas. These are popular in the English language by improving the efficiency of communications in this language, even being more frequently used in the academic environment even when t...
Chapter
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This species is assessed as Vulnerable because its extent of occurrence (EOO) is around 6,097 km2, its range is severely fragmented, and the extent and quality of its habitat are declining due to overgrazing and deforestation.
Article
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Members of Haplomylomys, a subgenus of Peromyscus, are widely distributed in northwestern Mexico and the southwestern United States; due to its taxonomic complexity, the systematics and biogeography of this group have been widely studied. However, the evolutionary relationships between island taxa within the eremicus group remain poorly understood....
Article
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Dominance is an important element of life history. It assures access to resources, which, in turn, affects fitness. By establishing a hierarchy, females may monopolize resources while remaining philopatric. Our genetic study of the sandy pocket mouse, Chaetodipus siccus, has shown a genetic microstructure with private haplotypes in the extremely sm...
Poster
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J.L. Dunnum*, R.C. Dowler, and ASM Systematic Collections Committee (2017): ASM Systematic Collections Committee 2017 resurvey of the mammal collections of the western hemisphere. Poster presented at the 97th Annual Meeting of the American Society of Mammalogists, University of Idaho, Moscow, Idaho, EEUU.
Article
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The current distribution and genetic relationships among populations of jackrabbits of the genus Lepus in the Baja California Peninsula and adjacent islands resulted from climate warming and rising sea levels following the Last Glacial Maximum, ~21 000 years BP. The colour pattern of the pelage and the genetic, biogeographic, and taxonomic relation...
Article
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Since Sylvilagus bachmani (Lagomorpha: Leporidae) from the Baja California Peninsula and S. mansuetus from San Jose Island, Mexico, display an allopatric distribution and are closely related, their taxonomy is unclear. The phylogenetic relationships among specimens of both species were evaluated using two mitochondrial genes (Cyt b, COI) and the be...
Article
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In this article we present an overview of the theoretical principles, objectives, and methods of analysis and importance of phylogenetic systematics, phylogeography, and molecular ecology. These are key to understanding the evolutionary history, patterns of geographic distribution, and ecological processes of living things.
Article
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We surveyed the status of the endemic deer mouse Peromyscus maniculatus exiguus from San Martin Island, Baja California, Mexico where the population is numerous. A total of 89 adult rodents of P. m. exiguus were caught, 51 of which were parasitized by the flea Tunga monositus (Siphonaptera: Pulicidae); prevalence was 57% and the mean infection inte...
Article
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Areas where abandoned metal-extraction mines are located contain large quantities of mineral wastes derived from environmentally unsafe mining practices. These wastes contain many pollutants, such as heavy metals, which could be released to the environment through weathering and leaching, hence becoming an important source of environmental metal po...
Article
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The coyote (Canis latrans) is one of the most widely distributed and opportunistic carnivores in North America. It feeds on a variety of different species, ranging from small- (rodents) to medium-sized mammals (Lagomorpha), reptiles, and birds. Among sea turtles, the main species nesting on the coasts of Baja California is Lepidochelys olivacea. So...
Article
We analyzed morphometric and molecular variation among 8 populations of Peromyscus zarhynchus grouped into 5 pooled samples representing separate physiographic regions across the range of this species in Chiapas, Mexico, and western Guatemala. Mitochondrial sequence data identify 2 well-supported and reciprocally monophyletic clades, separating all...
Article
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Heteromys nelsoni is restricted to cloud forests in the mountain range of the southern state of Chiapas, Mexico, and western Guatemala. It is considered an endemic species, under special protection, and endangered because its habitat has been modified by excessive logging and extensive cattle grazing. We evaluated the genetic variation of H. nelson...
Article
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Trophic guilds are useful concepts for advancing our knowledge of trophic structure of communities, dynamics of species interactions, redundancy in ecosystem services, resilience to disturbances, response to climate change, conservation strategies, etc. For insectivorous bats, current literature suggests 8 trophic-related guilds. These include 3 gu...
Chapter
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Abstract. Current knowledge of mammals in Baja California Sur is the result of efforts carried out by researchers, academicians and naturalists interested in the knowledge of the peninsular fauna. The bibliographical search of early works and recent biological explorations along the Baja California Peninsula recognized the presence of 147 taxa belo...
Article
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Myotis peninsularis Miller, 1898 is an endemic bat from the Cape Region in Baja California Sur, México. Its taxonomic status is unclear, either as a valid species or as a subspecies of M. velifer (J. A. Allen, 1890). In order to assess its taxonomic status, the objective of this study was to examine phylogenetic relationships of M. peninsularis, us...
Book
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Keys to the mammals of Mexico, Southern United States and Northern Central America
Article
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Geoducks (Panopea spp.) are recognized as one of the longest-lived and largest burrowing bivalves. Five extant species support commercial fisheries in different countries, yet their phylogenetic relationships are unclear. Phylogenetic analyses using cytochrome oxidase c subunit I, 28S, and 18S partial sequences on five Panopea spp. were performed t...
Article
Previous studies using mitochondrial DNA (mtDNA) genes suggest the black-tailed brush lizard, Urosaurus nigricaudus, which is a small-sized lizard from the peninsula of Baja California, Mexico, has 4 deeply isolated mtDNA lineages with sequence divergence ranging from 4% to 11.2%. We present its complete mitochondrial genome. This genome is 17,298...
Article
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INTRODUCTION: Chronic exposure to toxic levels of elements such as arsenic, cadmium, lead, mercury, nickel and others trace elements might cause abnormalities in gene expression affecting metabolic pathways such as those related to trace elements detoxification and the reproductive ability of animals. Rodent species have been the subject of several...
Article
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The Baja California peninsula is the second longest, most geographically isolated peninsula on Earth. Its physiography and the presence of many surrounding islands has facilitated studies of the underlying patterns and drivers of genetic structuring for a wide spectrum of organisms. Chaetodipus spinatus is endemic to the region and occurs on 12 ass...
Article
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Knowledge of the spatial distribution of rodents around kangaroo rat burrows may help us to understand the role that kangaroo rats play in the spatial organization of small desert rodent communities. In this study we analyzed the pattern of proximity between capture locations of desert rodents and burrows of Dipodomys merriami insularis, and descri...
Article
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Leucism is a partial hypopigmentary congenital disorder previously recorded in several species of mammals. This abnormal coloration is unusual in the wild. In August 2013, in Baja California, México, we collected 2 Peromyscus fraterculus (one female and one male) exhibiting leucism. Leucism has not been previously reported in the genus Peromyscus;...
Article
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Baja California Sur es el estado mexicano de mayor extensión costera; conforma un área de gran di-versidad y endemismos de especies y subespecies de mamíferos terrestres y marinos, cuenta con 30 familias, 69 géneros y 104 especies, de las cuales 11 son endémicas. Se presenta la lista actualizada de la mastofauna para el estado de acuerdo a los más...
Article
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The pocket mouse from the southern Baja California peninsula, Chaetodipus dalquesti, is synonymized to Chaetodipus ammophilus, following the Principle of Priority of the Code of Zoological Nomenclature, because C. ammophilus was described before C. dalquesti. The subspecies are reassigned.
Article
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 (nort...
Article
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We assessed the current distributions for 2 subspecies of the brush rabbit, Sylvilagus bachmani peninsularis and S. b. exiguus, on the Baja California Peninsula, Mexico. On the basis of field sampling, field notes, and voucher specimens in scientific collections, we demonstrated that (1) both subspecies have been previously recorded in mesic habita...