História natural e biologia reprodutiva de marsupiais no Pantanal, Mato Grosso, Brasil

Aragona, Mônica; Marinho‐Filho, Jader

doi:10.1590/s1984-46702009000200004

Cited by 23 publications

(21 citation statements)

References 7 publications

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“…All marsupials in Brazil belong to the order Didelphimorphia, native to the Americas. In fact, fifty-five out of the 92 species of opossum occur in Brazil (COSTA; LEITE; PATTON, 2003;ARAGONA;MARINHO FILHO, 2009). …”

Section: Introductionmentioning

confidence: 99%

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Morphological study of the male genital organs of Gracilinanus microtarsus

Lima

Santos

Viana

et al. 2013

Braz. J. Vet. Res. Anim. Sci.

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Gracilinanus microtarsus is one of the smallest marsupials on earth. Since it spreads seeds, it has great ecological relevance. However, its reproduction data, especially those related to the anatomy of its reproduction apparatus, are scarce in the literature. Current analysis describes the male genital organs of six adult specimens of G. microtarsus. Macroscopic studies were undertaken on dissected organs, whereas histological studies were performed by inclusion technique in paraffin and by hematoxylin and eosin, and Masson trichrome staining. The male genital organs and accessory glands of G. microtarsus consist of two testicles within a pendular scrotum, placed cranially to the penis, featuring a histology consisting of seminiferous tubules with spermatogenic cells, spermatozoa and Sertoli cells, and a peritubular region with Leydig cells; testicles closely associated with epididymis with head, body and tail, with histological differences between the different regions; deferent ducts; funiculus spermaticus; accessory glands composed of prostate, divided into three distinct segments and bulbourethral glands; pelvic and penile urethra and penis with bifid glans. Results show that the male genital organs and accessory glands of G. Microtarsus are anatomically similar to that found in Didelphis sp. and other marsupials groups, with slight details such as the site of each organ.Keywords: Didelphimorphia. Marsupials. Reproduction. Prostatic segments. ResumoGracilinanus microtarsus é um dos menores marsupiais do mundo. Possui grande potencial dispersor de sementes e por esta razão apresenta grande importância ecológica. No entanto, dados em relação à reprodução desses animais são escassos na literatura, principalmente, aqueles relacionados à anatomia dos órgãos do aparelho reprodutor. Por essa razão, objetivamos com este estudo realizar uma descrição dos órgãos genitais masculinos em seis exemplares de G. microtarsus adultos. Para tanto, realizamos estudos macroscópicos por dissecação dos órgãos e estudos histológicos por técnica de inclusão em parafina e coloração em hematoxilina e eosina, e tricromo de Masson. Encontramos, que os órgãos genitais masculinos e glândulas acessórias em G. microtarsus são representados por dois testículos localizados dentro de um escroto pendular, posicionados cranialmente ao pênis, cuja histologia revelou túbulos seminíferos com espermatogônias, espermatozoides e células de Sertoli e região peritubular com células de Leydig; testículos em íntima associação com os epidídimos, divididos em cabeça, corpo e cauda, com diferenças histológicas entre as diferentes regiões; ductos deferentes; funículo espermático; glândulas anexas compostas pelas glândulas prostáticas divididas em três distintos segmentos e glândulas bulbouretrais; uretra pélvica e peniana e um pênis com glande bífida. Concluímos que os órgãos genitais e as glândulas acessórias masculina de G. microtarsus, anatomicamente são muito semelhantes aos dos Didelphis sp. e outros grupos de marsupiais, diferenciando-se apenas...

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Section: Introductionmentioning

confidence: 99%

“…The feet and paws are small and whitish and the ears are bare and mobile. Besides the prehensile tail, its feet have an opposing thumb to grip tree branches (ARAGONA; MARINHO FILHO, 2009).…”

Section: Introductionmentioning

confidence: 99%

Morphological study of the male genital organs of Gracilinanus microtarsus

Lima

Santos

Viana

et al. 2013

Braz. J. Vet. Res. Anim. Sci.

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“…Joining the available information, we approach comprehensive patterns of mammalian ecology, combining habitat features and species interactions in search of unifying trends for the species, populations and communities to the drastically seasonal habitats. The relevant literature on species occurrence, community composition, population densities, habitat preference, and interspecific relations of mammals in the Pantanal was surveyed.The reviewing of records of Pantanal mammals was based on previous revisions and additional scientific literature and technical reports (Marinho-Filho and Sazima, 1998; Wilig et al, 2000;Oliveira et al, 2002;Rodrigues et al, 2002;Camargo and Fischer, 2005;Longo et al, 2007;Marinho-Filho, 2007;Carmignotto, 2004;Cáceres et al, 2008;Aragona and Marinho-Filho, 2009;Tomás et al, 2010). Species names follow Wilson and Reeder (2005) and Reis et al (2006); classes of extinction threats follow the International Union for Conservation of Nature (IUCN) and the Livro Vermelho da Fauna Brasileira Ameaçada de Extinção (IBAMA) of the Ministério do Meio Ambiente (Brazilian Ministry of the Environment).…”

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confidence: 99%

Terrestrial and aquatic mammals of the Pantanal

2011

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Different works have registered the number of mammal species within the natural habitats of the Pantanal based on currently known records, with species richness ranging from 89 to 152 of annotated occurrences. Our present list sums 174 species. However, at least three factors have to be emphasised to deal with recorded numbers: 1) to establish the ecotone limit between the floodplain (which is the Pantanal) and its neighbouring domain like the Cerrado, besides the existence of maps recently produced; 2) the lack of intensive surveys, especially on small mammals, rodents and marsupials; and 3) the constant taxonomic revision on bats, rodents and marsupials. Some species are very abundant -for example the capybara Hydrochoerus hydrochaeris and the crab-eating fox Cerdocyon thous, and some are rare, and others are still intrinsically rare -for example, the bush dog Speothos venaticus. Abundance of species is assumed to reflect ecological resources of the habitat. Local diversity and number of individuals of wild rodents and marsupials also rely on the offering of ecological resources and behavioural specialisation to microhabitat components. A large number of species interact with the type of the vegetation of the habitat, by means of habitat selection through active patterns of ecological behaviour, resulting on dependency on arboreal and forested habitats of the Pantanal. In addition, mammals respond to seasonal shrinking-and-expansion of habitats due to flooding regime of the Pantanal. The highest number of species is observed during the dry season, when there is a considerable expansion of terrestrial habitats, mainly seasonally flooded grassland. Major threats to mammal species are the loss and alteration of habitats due to human intervention, mainly deforestation, unsustainable agricultural and cattle-ranching practices, which convert the natural vegetation into pastures. The Pantanal still harbours about a dozen of species officially listened as in danger.Keywords: biodiversity, conservation, Pantanal habitats, mammal species, environmental threat. Mamíferos terrestres e aquáticos do Pantanal ResumoDiversos trabalhos têm registrado o número de espécies de mamíferos nos diferentes hábitats naturais do Pantanal, com base nos registros do conhecimento corrente, com a riqueza de espécies variando de 89 a 152 ocorrências anotadas. Nossa lista atual soma 174 espécies. Contudo pelo menos três fatores devem ser enfatizados quando se lida com os números encontrados: 1) o limite exato do ecótono entre a bacia de inundação (que é o Pantanal) e os domínios vizinhos, como o Cerrado, apesar da existência de mapas recentes; 2) a falta de levantamentos intensivos, particularmente sobre pequenos mamíferos, roedores e marsupiais; e 3) a revisão taxonômica constante de morcegos, roedores e marsupiais. Algumas espécies são abundantes, como a capivara Hydrochoerus hydrochaeris, e o lobinho Cerdocyon thous, outras são raras e outras ainda são intrinsecamente raras, como o cachorro-vinagre Speothos venaticus. Assume-se que...

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“…Population studies of small rodents and marsupials in the Pantanal biome have been few and far between as well as for short periods of time (SCHALLER 1983, LACHER & ALHO 1989, HERRERA et al 2007, ARAGONA & MARINHO-FILHO 2009, none having been conducted in the southeast region (Nhecolândia). Reproduction of most species begins at the end of the dry season and is intensified during the wet season in the northern Pantanal (ARAGONA & MARINHO-FILHO 2009).…”

mentioning

confidence: 99%

“…Reproduction of most species begins at the end of the dry season and is intensified during the wet season in the northern Pantanal (ARAGONA & MARINHO-FILHO 2009). However, this region displays several features strongly associated to Cerrado physiognomies, featuring drier areas in comparison to the southeast Pantanal (ADÁMOLI 1987).…”

mentioning

confidence: 99%

Population ecology of small rodents and marsupials in a semi-deciduous tropical forest of the southeast Pantanal, Brazil

Andreazzi¹,

Rademaker²,

Gentile³

et al. 2011

Zoologia (Curitiba)

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The Pantanal is a South American biome characterized by extensive plains and stark environmental seasonality. Several habitats are subject to annual flooding, forcing small mammal species to aggregate in dry forest patches, which most likely influences their population dynamics and life history strategies. In order to investigate the seasonal influence on the life history traits of these small mammals, we conducted a 2-year mark-recapture study in the southeastern region of the Brazilian Pantanal (Nhecolândia) and analyzed the population dynamics of the most abundant small mammal species with the jackknife estimator. A trapping effort of 21,560 trap-nights resulted in 615 individuals in 1,171 captures (success = 5.43%). Three species of rodents - Oecomys mamorae (Thomas, 1906), Thrichomys pachyurus (Wagner, 1845), and Clyomys laticeps (Thomas, 1841) - and three species of marsupials - Gracilinanus agilis (Burmeister, 1854), Thylamys macrurus (Olfers, 1818), and Monodelphis domestica (Wagner, 1842) - were obtained. The most abundant species was O. mamorae, followed by G. agilis and T. pachyurus. Oecomys mamorae was more abundant in the wet season and presented an opportunistic reproductive strategy. Gracilianus agilis displayed increased population sizes in the dry season and synchronized, seasonal reproduction during the rainy season. Thrichomys pachyurus had a small population size, delayed response to variations in environmental conditions and higher reproductive rates in the dry season. All species revealed different life history strategies (seasonal, opportunistic or delayed response to environmental variations), coinciding with periods of higher resource availability in order to maximize survival

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História natural e biologia reprodutiva de marsupiais no Pantanal, Mato Grosso, Brasil

Cited by 23 publications

References 7 publications

Morphological study of the male genital organs of Gracilinanus microtarsus

Morphological study of the male genital organs of Gracilinanus microtarsus

Terrestrial and aquatic mammals of the Pantanal

Population ecology of small rodents and marsupials in a semi-deciduous tropical forest of the southeast Pantanal, Brazil

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