VIII CBMz - Citogenômica de Mamíferos

Genomic ancestry of the American puma

CULVER, M.; JOHNSON, W.E.; PECON-SLATTERY, J.; O'BRIEN, S.J. 2000. Genomic ancestry of the American puma (Puma concolor). The Journal of Heredity 91(3):186-197.

Abstract. Puma concolor, a large American cat species, occupies the most extensive range of any New World terrestrial mammal, spanning 110 degrees of latitude from the Canadian Yukon to the Straits of Magellan. Until the recent Holocene, pumas co-existed with a diverse array of carnivores including the American lion (Panthera atrox), the North American cheetah (Myracynonyx trumani), and the saber toothed tiger (Smilodon fatalis). Genomic DNA specimens from 135 pumas of specified geographic origin (261 contemporany and 54 museum specimens) were collected for molecular genetic and phylogenetic analyses of three mitochrondrial gene sequences (16S rRNA, ATPase-8, and NADH-5) plus composite microsatellite genotypes (10 feline loci). Six phylogeographic groupings or subspecies were resolved, and the entire North American population (186 individuals from 15 previously named subspecies) was genetically homogeneous in overall variation relative to central and South American populations. The marked uniformity of mtDNA and a reduction in microsatellite allele size expansion indicates that North American pumas derive from a recent (late Pleistocene circa 10,000 years ago) replacement and recolonization by a small number of founders who themselves originated from a centrum of puma genetic diversity in eastern South America 200,000-300,000 years ago. The recolonization of North American pumas was coincident with a massive late Pleistocene extinction event that eliminated 80% of large vertebrates in North America and may have extirpated pumas from that continent as well.

VII CBMz - Livro de Resumos

Hoje, ao invés de um novo artigo, disponibilizo o livro de resumos do VII Congresso Brasileiro de Mastozoologia para download gratuito. Por motivos óbvios não há abstract (já que são vários trabalhos).

The phylogeny of Cetartiodactyla: the importance of dense taxon sampling, missing data, and the remarkable promise of cytochrome b to provide realiable species-level phylogenies

AGNARSSON, I.; MAY-COLLADO, L.J. 2008. The phylogeny of Cetartiodactyla: the importance of dense taxon sampling, missing data, and the remarkable promise of cytochrome b to provide realiable species-level phylogenies. Molecular Phylogenetics and Evolution 48:964-985.

Abstract. We perform Bayesian phylogenetic analyses on cytochrome b sequences from 264 of the 290 extant cetartiodactyl mammals (whales plus even-toed ungulates) and two recently extinct species, the "Mouse Goad" and the "Irish Elk". Previous primary analyses have included only a small portion of the species diversity within Cetartiodactyla, while a complete supertree analysis lacks resolution and branch lenghts limiting its utility for comparative studies. The benefits of using a single-gene approach include rapid phylogenetic estimates for a large number of species. However, single-gene phylogenies often differ dramatically from studies involving multiple datasets suggesting that they often are unrealiable. However, based on recovery of banchmark clades - clades supported in prior studies based on multiple independent datasets - and recovery of undisputed traditional taxonomic groups, Cytb performs extraordinarily well in resolving cetartiodactyl phylogeny when taxon sampling is dense. Missing data, however, (taxa with partial sequences) can compromise phylogenetic accuracy, suggesting a tradeoff between the benefits of adding taxa and introducing question marks. In the full data, a fez species with a short sequences appear misplaced, however, sequence lenght alone seems a poor predictor of this phenomenon as other taxa with equally short sequences were not conspicuously misplaced. Although we recommend awaiting a better supported phylogenetic hypotheses provided here represent the currently best available tool for comparative species-level studies within this group. Cytb has been sequenced for a large percentage of mammals and appears to be a reliable phylogenetic marker as long as taxon sampling is dense. Therefore, an opportunity exists now to reconstruct detailed phylogenies of most of the major mammalian clades to rapidly provide much needed tools for species-level comparative studies.

Workshop em Sistemática Filogenética 2015

Estão abertas as inscrições para o Workshop em Sistemática Filogenética 2015, a ser realizado entre os dias 23 e 27 de fevereiro de 2015 na UNESP, campus de São Hosé do Rio Preto (SP). O idioma do Workshop é o Inglês, e as vagas são limitadas, até o dia 15 de dezembro de 2014. Os interessados podem obter mais informações pelo e-mail: workshopsistematica@gmail.com.

Napoleon Bonaparte and the fate of an Amazonian rat: new data on the taxonomy of Mesomys hispidus (Rodentia: Echimyidae)

ORLANDO, L.; MAUFFREY, J.-F.; CUISIN, J.; PATTON, J.L.; HÄNNI, C.; CATZEFLIS, F. 2003. Napoleon Bonaparte and the fate of an Amazonian rat: new data on the taxonomy of Mesomys hispidus (Rodentia: Echimyidae). Molecular Phylogenetics and Evolution 27:113-120.

Abstract. The spiny rat Mesomys hispidus is one of many South American rodents that lack adequate taxonomic definition. The few sampled populations of this broadly distribuuted trans-Amazonian arboreal rat have come from widely separated regions and are typically highly divergent. The holotype was described in 1817 by A.-G. Desmarest, after Napoleon's army brought it to Paris following the plunder of Lisbon in 1808; however, the locality of origin has remained unknown. Here we examine the taxonomic status of this species by direct comparison of 50 extant individuals with the holotype at the morphometric and genetic levels, the latter based on 331 bp of the mitochondrial cytochrome b gene retrieved from a small skin fragment of the holotype with ancient DNA technology. Extensive sequence divergence is present among samples of M. hispidus collected from throughout its range, from French Guiana across Amazonia to Bolivia and Peru, with at least seven mitochondrial clades recognized (average divergence of 7.7% Kimura 2-parameter distance). Sequence from the holotype is, however, only weakly divergent from those of recent samples from French Guiana. Moreover, the holotype clusters with greater that 99% posterior probability with samples from this part of Amazonia in a discriminant analysis based on 22 cranial and dental measurements. Thus, we suggest that the holotype was originally obtained in eastern Amazonia north of the Amazon River, most likely in the Brazilian state of Amapá. Despite the high level of sequence diversity and marked morphological differences in size across the range of M. hispidus, we continue to regard this assemblage as a single species until additional samples and analyses suggest otherwise.

The molecular phylogenetics of tuco-tucos (genus Ctenomys, Rodentia: Octodontidae) suggests an early burst of speciation

LESSA, E.P.; COOK, J.A. 1998. The molecular phylogenetics of tuco-tucos (genus Ctenomys, Rodentia: Octodontidae) suggests an early burst of speciation. Molecular Phylogenetics and Evolution 9(1):88-99.

Abstract. Variation in the nucleotide sequence of the entire mitochondrial cytochrome b gene (1140 bp) was examined for 27 individuals representing 13 species of South American rodents of the genera Ctenomys, Octodontomys, Tympanoctomys, and Spalacopus. Representatives of the family Echimyidae, Euryzygomatomys and Mesomys, were used as outgroups to test the monophyly of the Octodontinae and Ctenomyinae. Relationships among species of tuco-tucos (genus Ctenomys) were also exmined including representatives of the three described subgenera and the two sperm morphs. Reciprocal monophyly of the Octodontinae and Ctenomyinae is strongly supported. Several basal relationships among species of the genus Ctenomys are poorly resolved, suggesting the possibility of a hard polytomy due to a rapid and potentially simultaneous radiation early in the history of the genus. In other cases, clades within the Ctenomyinae previously identified on the basis of allozymes, chromosomes, parasites, or skull morphology were supported. Calibrations based on the fossil record suggest that the mitochondrial cytochrome b of these caviomorphs has evolved at a rapid rate, comparable to those proposed for Mus-Rattus, and three to four times higher than ungulate rates.

Cariotipo de Peromyscus grandis (Rodentia: Cricetidae)

ORDÓÑEZ-GARZA, N.; SWIER, V.J.; HANSON, J.D.; SOTERO-CAIO, C.G.; BRADLEY, R.D. 2013. Cariotipo de Peromyscus grandis (Rodentia: Cricetidae). Therya 4(3):575-580. doi: 10.12933/therya-13-122

Abstract. Peromyscus grandis is a rodent whose distribution is restricted to the mountain ranges of central Guatemala. This note represents the first report of karyotypic data for this species. The karyotype (fundamental number = 58) closely resembles karyotypes of other species of Peromyscus.

Variabilidade genética en géneros de ciervos neotropicales (Mammalia: Cervidae) según loci microsatelitales

RUIZ-GARCÍA, M.; MARTINEZ-AGÜERO, M.; ÁLVAREZ, D.; GOODMAN, S. 2009. Variabilidade genética en géneros de ciervos neotropicales (Mammalia: Cervidae) según loci microsatelitales. Revista de Biología Tropical 57(3):879-904.

Abstract. Genetic variability in Neotropical deer genera (Mammalia: Cervidae) according to DNA
microsatellite loci. Species conservation programs are highly based on analyses of population genetics. We compared eight Neotropical Cervidae (Mazama americana, M. gouzaoubira, M. rufina, Odocoileus virginianus, Hippocamelus antisensis, Pudu mephistopholes, Ozotoceros bezoarticus and Blastoceros dichotomus) and some European and Asian Cervidae (Cervus elaphus, C. nippon, Capreolus capreolus, C. pygargus and Dama dama). The European species C. elaphus was our standard for a high degree of genetic variability: we used a Scottish population originated in the mix of diverse Western European subspecies. On the contrary, Cervus nippon (a population from Scotland with a founder effect) was our standard for a depauperated population. The M. americana, M. gouzaoubira and O. virginianus samples had high diversity values close to our C. elaphus population (H= 0.64, 0.70 and 0.61, respectively), while M. rufina was very low, close to C. nippon. Several sample sets of Mazama and Odocoileus yielded a homozygote excess, probably due to the Wahlund (subdivison) effect. There was no evidence of recent bottleneck events.

Systematics of Oxymycterus with description of a new species from Uruguay

HOFFMANN,F.G.; LESSA, E.P.; SMITH, M.F. 2002. Systematics of Oxymycterus with description of a new species from Uruguay. Journal of Mammalogy 83(2):408-420.

Abstract. The taxonomic status of the genus Oxymycterus in Uruguay is assessed through morphologic, morphometric, and molecular comparisons with other species in the genus. Our analyses uncover the existence of a previously undescribed species, described herein, and restrict O. nasutus to SE Uruguay and SE Brazil. Uruguayan species are morphologically similar but differ substantially in sequences of the mitochondrial cytochrome-b gen. In contrast, O. rufus was found to be morphologically distinct from O. nasutus and the new species but genetically similar to the new species. Phylogenetic analyses lack resolution ar the base of the genus suggest well-supported relationships between O. amazonicus and O. delator, O. quaestor and O. judex, and O. rufus and the new species.

A review of the boliviensis group of Akodon (Muridae:Sigmodontinae), with emphasis on Peru and Bolivia

SMITH,G.R.; FINK, S.V. 1990. A review of the boliviensis group of Akodon (Muridae:Sigmodontinae), with emphasis on Peru and Bolivia. Miscellaneous Publications, Museum of Zoology, University of Michihan 177:1-104.

Abstract. We recognize the Akodon boliviensis group as an informal assemblage of species including Akodon boliviensis (western Bolivia and Puno Department, Peru), Akodon puer (subspecies caenosus in northwestern Argentina and southern Bolivia, puer in central Bolivia, and lutescens in Puno Department, Peru and La Paz Department, Bolivia), Akodon subfuscus (subspecies subfuscus in southeastern Peru and La Paz Department, Bolivia; also a new subspecies from southeastern Peru), and Akodon n. sp. (central Peru). We further suggest that Akodon spegazzinii (subspecies spegazzinii and tucumanensis) from northern Argentina may be a member of this group. Akodon pacificus os shown to be a synonym of A. boliviensis. The bolivisneis group is diagnosed by a combination of characters including small size, delicate cranium, narrow and straight-sided mesopterygoid fossa, hourglass-shaped interorbital region, and dull brown fur without contrastingly colored areas.

Descriptions of included species and subspecies are provided. Traditional cranial, dental, and external characters are used in combination with electrophoresis and anatomical features of the soft palates, male reproductive tracts, and hind feet to recognize and diagnose species. Treatment of age-related variation is particularly important to distinguish these species; we document qualitative and quantitative changes in cranial morphology with age (toothwear class) and use regression to allow comparison of individuals of different ages.

We tentatively propose that subfuscus, puer, and the new species form a clade with bolivisneis as its sister group. This hypothesis cannot be subjected to formal test, however, until the condition of relevant characters in potential outgroups is better understood.

Karyology of the Atlantic forest rodent Juliomys (Cricetidae): a new karyotype from southern Brazil

PARESQUE, R.; CHRISTOFF, A.U.; FAGUNDES, V. 2009. Karyology of the Atlantic forest rodent Juliomys (Cricetidae): a new karyotype from southern Brazil. Genetics and Molecular Biology 32:301-305.

Abstract. Juliomys is a small rodent from the family Cricetidae which inhabits the Atlantic forest and forests from Argentina to eastern Brazil. The three species recognized so far have different karyotypes. In this paper, we describe a new karyotype with 2n = 32, FN = 48 found in Juliomys specimens from a high-altitude area in the Atlantic forest of southern Brazil. The karyotype was analyzed after G- and C-banding and silver staining of the nucleolus organizer regions (Ag-NOR) and its G-banding patterns were compared with those of the newly described species Juliomys ossitenuis (2n = 20, FN = 36). The 2n = 32 karyomorph presented peculiar features and was very different from those of the other species of the genus: J. pictipes (2n = 36, FN = 34), J. rimofrons (2n = 20, FN = 34) and J. ossitenuis (2n = 20, FN = 36). Differences were mostly due to centric and tandem fusions, pericentric inversion and loss of hetero-chromatin. The karyotype represents a powerful tool to differentiate Juliomys species and our data suggest that the karyotype described herein belongs to a new species.

An introduction to Marmosops (Marsupialia: Didelphidae), with the description of a new species from Bolivia and notes on the taxonomy and distribution of other bolivian forms

VOOS, R.S.; TARIFA, T.; YENSEN, E. 2004. An introduction to Marmosops (Marsupialia: Didelphidae), with the description of a new species from Bolivia and notes on the taxonomy and distribution of other bolivian forms. American Museum Novitates 3466:1-40.

Abstract. In order to facilitate much-needed revisionary research on Marmosops, we summarize the currently accepted species-level taxonomy, provide full bibliographic citations for original descriptions of all 36 included nominal taxa, map their type localities, and list their type material (if known). We rediagnose the genus Marmosops, compare it with three other didelphid genera to which misidentified specimens of Marmosops have often been referred, and review the phylogenetic evidence that Marmosops is monophyletic. After describing a new species from the eastern-slope montane forest of Bolivia, we review the taxonomy of other Bolivian congeners based on morphological characters and published cytochrome-b gene sequences. Among our taxonomic results, we synonymize albiventris Tate (1931), dorothea Thomas (1911), and yungasensis Tate (1931) with M. noctivagus (Tschudi, 1845). By contrast, M. ocellatus (Tate, 1931), currently considered a synonym of dorothea, appears to be a valid species. Whereas published range maps of Bolivian species of Marmosops are demonstrably based on misidentified material and show little correspondence with known environmental factors, locality records based on specimens examined for this report make much more eco-geographic sense.

The historical bridge between the Amazon and the Atlantic Forest of Brazil: a study of molecular phylogeography with small mammals

COSTA, L.P. 2003. The historical bridge between the Amazon and the Atlantic Forest of Brazil: a study of molecular phylogeography with small mammals. Journal of Biogeography 30:71-86.

Abstract.
Aim. To examine how the genetic diversity of selected taxa of forest-dwelling small mammals is distributed between and within the major rain forest domains of Amazonia and Atlantic Forest and the intervening interior forests of Brazil, as inferred by the relationships between gene genealogies and geography. I also addressed the historical importance of the central Brazilian forests in connecting Amazon and Atlantic Forest populations of rodents and marsupials.
Methods. I evaluated variation in the mitochondrial cytochrome b gene to estimate the levels of sequence divergence between those taxa occurring throughout the Amazon, Atlantic Forest, and forests in the Cerrado and Caatinga regions. I inferred the hierarchical relationships between haplotypes, populations and formal taxa using the cladistic approach of maximum parsimony. I compared areas and the clades identified by superimposing cladograms on the geographical distribution of samples. The degree of concordance both in phylogeny and the depth of the nodes in these phylogenies, in addition to patterns of geographical distribution of clades, permitted me to make inferences on how, when and where the taxa differentiated.
Results. Sequence similarity is often greater between samples from the Atlantic Forest and either Amazon or central Brazilian forests than it is within each of the two rain forest domains. The Atlantic Forest clades are either not reciprocally monophyletic or are the sister group to all the other clades. There is some indication of northern and southern components in the Atlantic Forest. Given the geographical distribution of clades and the relatively deep levels of divergence, the central Brazilian area does not behave as a separate region but is complementary to either Amazon or Atlantic Forest. Patterns of area relationships differ across taxa, suggesting that different processes and ⁄or historic events affected the diversification within each lineage.
Main conclusions. The Amazon and the Atlantic forests are not exclusive in terms of their small mammal faunas; both overlap broadly with taxa occurring in gallery forests and dry forests in central Brazil. Central Brazilian forests are an integral part of the evolutionary scenario of lowland small mammals, playing an important role as present and past habitats for rain forest species. Therefore, representatives from this area should always be included in analyses of the evolutionary history of lowland rain forest faunas. The incongruence of branching patterns among areas is in agreement with recent results presented for Neotropical passerine birds and indicates that a single hypothesis of Neotropical area relationships is unlikely. These findings reinforce the idea that speciation in the Neotropics will not be explained by any single model of vicariance or climatic changes.

The pampas cat group (genus Lynchailurus Severtzov, 1858) (Carnivora: Felidae), a systematic and biogeographic review

GARCIA-PEREA, R. 1994. The pampas cat group (genus Lynchailurus Severtzov, 1858) (Carnivora: Felidae), a systematic and biogeographic review. American Museum Novitates 3096:1-36.

Abstract. A systematic study of 86 specimens of South American cats formerly known as Felis colocolo reveals three species, in addition to a new subspecies described herein. The three species are grouped in the genus Lynchailurus on the basis of shared character states. Lynchailurus pajeros occurs on high-elevation steppes from Ecuador to Bolivia and Argentina (eastern slope of the Andes), and farther south in Argentina into lowland steppe, shrubland, and dry forest habitats. Its southern limit is Patagonia (Argentinean and Chilean). Lynchailurus braccatus is found in Brazil, Paraguay, and Uruguay, where it occupies humid and warmer grassland and forested areas, at moderate elevations. Lynchailurus colocolo occurs in subtropical forests at middle elevations in central Chile, and in high-elevation steppes in northern Chile on the western slope of the Andes. The latter species may be endangered, because its distribution is limited. Assigned subspecies are as follows: L. pajeros budini and L. p. crespoi, in northwestern Argentina; L. p. crucinus, in southern Argentina and Chile; L. p. garleppi, in Peru; L. p. pajeros, in central Argentina; L. p. steinbachi, in Bolivia; L. p. thomasi, from Ecuador; L. braccatus braccatus, in southwestern Brazil and Paraguay; L. b. munoai, in Uruguay and southern Brazil; L. colocolo colocolo, in central Chile; and L. c. wolffsohni (new subspecies), in northern Chile.

Revisão sobre o fenômeno da hibridização em cetáceos e pinípedes

SCHAURICH, M.N.; LOPES, F.R.V.; OLIVEIRA, L.R. 2012. Revisão sobre o fenômeno da hibridização em cetáceos e pinípedes. Neotropical Biology and Conservation 7(3):199-209.

Abstract. The hybridism is the result of mating between two individuals from different and reproductively isolated gene pools accepted as species that usually generate infertile offspring. The evolutionary consequences of this phenomenon vary depending on the mating system, hybrid’s frequency, the degree of reproductive isolation and the genetic differences between the parental species as well as their speciation process. Hybrids have been recorded frequently in aquatic and terrestrial mammals, both in nature and captivity. We review studies published in peer-reviewed journals between 1940 and 2010, in which hybrid cases were reported for cetaceans and pinnipeds. We found 37 scientific papers recording 1,201 hybrids: 57 in cetaceans (nature = 27; captivity = 30) and 1,144 in pinnipeds (nature = 1,137; captivity = 7). A possible explanation for this phenomenon in the wild could be the close phylogenetic relatedness between parental species and also the potential absence of conspecific breeding partners. This last factor could be a result of population decline due to commercial exploitation occurred in the past. This fact is valid for pinnipeds, but especially true for blue whales, Balaenoptera musculus. It is important to note that about 99% of pinniped hybrids were reported in sympatric breeding colonies along the subantarctic islands, which facilitate the hybridization. Outbreeding depression followed by loss of genetic variability and reduction of evolutionary potential and consequently increasing the risk of extinction are the most important results of the hybridism.

Genome-wide loss of diversity in the critically endangered hawaiian monk seal

SCHULTZ, J.K.; MARSHALL, A.J.; PFUNDER, M. 2010. Genome-wide loss of diversity in the critically endangered hawaiian monk seal. Diversity 2(6):863-880. doi: 10.3390/d2060863.

Abstract. Threatened species often exhibit low genetic diversity as a result of selective sweeps, historical bottlenecks, or persistent small population size. Whereas selective sweeps create localized reduction of variation at a chromosome, population bottlenecks result in the loss of rare alleles throughout the genome. Heterozygosity is lost more slowly and is severely impacted only when populations are small for an extended period of time. We test the hypotheses of selective sweep, historical bottleneck and persistently small population size to explain extremely low genetic diversity in the critically endangered Hawaiian monk seal (Monachus schauinslandi). Of 163 microsatellite loci isolated from the species’ genome, only 17 are polymorphic. Mapping 98 monomorphic and 12 polymorphic loci to 35 chromosomes throughout the dog genome, we reject the selective sweep hypothesis. Genotyping 2,423 Hawaiian monk seals at the 17 polymorphic loci plus a locus previously isolated from another pinniped species, we find evidence for a recent bottleneck (P = 0.04). This is consistent with historical records describing intense hunting in the 19th century; however, the bottleneck was not of sufficient severity and duration to explain the genome-wide depletion of genetic diversity (HO = 0.05; A = 1.1). Long-term population size restriction is a more likely explanation. Though at least two of the polymorphic loci appear to be candidates for selection, the low genetic diversity of the species may further threaten chances for survival of this critically endangered species in a changing world.

Building large trees by combining phylogenetic information: a complete phylogeny of the extant Carnivora (Mammalia)

BININDA-EMONDS, O.R.P.; GITTLEMAN, J.L.; PURVIS, A. 1999. Building large trees by combining phylogenetic information: a complete phylogeny of the extant Carnivora (Mammalia). Biol. Rev. 74:143-175.

Abstract. One way to build large, more comprehensive phylogenies is to combine the vast amount of phylogenetic information already available. We review the two main strategies for accomplishing this (combining raw data versus combining trees), but employ a relatively new variant of the latter: supertree construction. The utility of one supertree technique, matrix representation using parsimony analysis (MRP), is demonstrated by deriving a complete phylogeny for all 271 extant species of the Carnivora from 177 literature sources. Beyond providing a 'consensus' estimate of carnivore phylogeny, the tree also indicates taxa for which the relationships remain controversial (e.g. herpestids, viverrids, and intrageneric relationships in the procyonids). Times of divergence throughout the tree were also estimated from 74 literature sources based on both fossil and molecular data. We use the phylogeny to show that some lineages within the Mustelinae and Canidae contain significantly more species than expected for their age, illustrating the tree's utility for studies of macroevolution. It will also provide a useful foundation for comparative and conservational studies involving the carnivores.

Mamíferos: da Terra aos Mares

A equipe do Laboratório de Ecologia de Mamíferos da Unisinos têm o prazer de convidar todos a participar da oficina Mamíferos: da Terra aos Mares.

A oficina visa apresentar o grupo dos mamíferos com aspectos de sua evolução, diversidade, ecologia, manejo, conservação e relações com o homem. A oficina ocorrerá nos dias 24 e 25 de agosto, e 1º de setembro de 2012, na Unisinos (Univerdade do Vale do Rio dos Sinos), em São Leopoldo, RS. As inscrições podem ser realizadas diretamente pela internet através do link: http://www.unisinos.br/extensao/eventos/EX120309/EX120309-00001/620/apresentacao.

DATAS: 24 e 25 de agosto, e 1º de setembro de 2012.


INVESTIMENTO: R$ 100,00.


INFORMAÇÕES: www.unisinos.br/eventos (eventos saúde).


CONTEÚDO PROGRAMÁTICO PREVISTO
A oficina será dividida em quatro módulos, sendo o primeiro módulo uma apresentação geral sobre características, diversidade e evolução dos mamíferos. Os quatro módulos seguintes apresentarão aspectos gerais e ecológicos sobre os mamíferos terrestres, e os quatro módulos seguintes apresentarão técnicas de estudo e monitoramento de populações de mamíferos marinhos, bem como suas interações com o homem.


O conteúdo detalhado previsto (sujeito a modificações) segue abaixo:


24/ago/2012
- Introdução geral: mamíferos, da terra aos mares (Msc Paulo T. Sarti, Fernando R.V. Lopes).

25/ago/2012

- Biologia e ecologia de pequenos mamíferos (Msc Maury S.L. Abreu).

- Padrões de microestrutura de pelos: identificando mamíferos (Nathalia S. Freitas).

- Mamíferos terrestres de médio e grande porte (Msc Paulo T. Sarti).

- O uso do habitat por mamíferos terrestres (Guilherme W. Schmitz).

01/set/2012

- Técnicas de estudo em mamíferos-marinhos: coleta, curadoria de coleção e estudos osteológicos (Biol. Ana Paula Costa).

- Técnicas de estudo em mamíferos-marinhos: monitoramento de populações (Biol. Rodrigo Machado, Biol. Ana Paula Costa, Fernando R.V. Lopes).

- Interações entre mamíferos aquáticos e a atividade pesqueira: da pesca cooperativa ao conflito (Biol. Rodrigo Machado).

- Dimensões humanas (Mônica Terra, Biol. Ana Carolina Pont).

Distribution extension and sympatric occurrence of Gracilinanus agilis and G. microtarsus (Didelphimorphia, Didelphidae), with cytogenetic notes

GEISE, L.; ASTÚA, D. 2009. Distribution extension and sympatric occurrence of Gracilinanus agilis and G. microtarsus (Didelphimorphia, Didelphidae), with cytogenetic notes. Biota Neotropica 9(4):269-276.

Abstract. Gracilinanus microtarsus, from the Atlantic Forest and G. agilis, widespread in central Brazil in the Cerrado and in the northeastern Caatinga are two small Neotropical arboreal opossum species not frequently recorded in simpatry. Here we report eight G. agilis specimens from three localities and 17 G. microtarsus, from 10 localities, all in Minas Gerais, Rio de Janeiro and Bahia states. Species proper identification followed diagnostic characters as appearance of dorsum pelage, ocular-mark, ears and tail lengths and size proportion of the posteromedial vacuities in cranium. Chromosomes in metaphases of five specimens were obtained for both species. Our records extend the previous known geographical distribution of G. microtarsus to Chapada Diamantina, in Bahia State and report the occurrence of both species in simpatry. G. microtarsus, in coastal area, was captured in dense ombrophilous and in semideciduous forests, in deciduous seasonal forest and Cerradão in Chapada Diamantina. G. agilis was recorded in gallery forests of Cerrado and very green and dense bush formation of Caatinga. Autosomal complement showed the same diploid and autosomal number already described for both species (2n = 14, NA = 24). Measurements are according to those given in literature and pelage characteristics were useful for the correct species identification. Here we report both G. agilis, described to be endemic to the Cerrado/Caatinga, in opposite to G. microtarsus, considered to be endemic to Atlantic Forest occurring in simpatry in two localities of the Cerrado. Such results indicates that long term trapping effort are necessary to a better definition of species taxonomy, distribution patterns along time and comprehensive understanding how anthropic environmental changes can be interfering in their evolutionary history.