Search results for: Emerson M. Vieira

Items from 1 to 20 out of 28 results

article

Increasing fire severity alters the species composition and decreases richness of seeds potentially dispersed by small mammals

Águeda Lourenço, Clarice Vieira Souza, André Faria Mendonça, Guilherme Gonçalves Reis, more

Seed dispersal is a key process that influences the recruitment of plant species, yielding profound consequences on vegetation structure. This process can be affected by environmental disturbances, such as fires, leading to varied impacts on the agents involved, both dispersers and plants. We investigated the potential role of small mammals (rodents and marsupials) as seed dispersers in a Neotropical...

article

Seasonal isotopic niche of a rodent: High between‐individual variation but no changes in individual niche width during the rich‐resource period

Nícholas F. Camargo, Guilherme G. Reis, Anna Carla L. Camargo, Gabriela B. Nardoto, more

Biotropica > 53 > 3 > 966 - 975

The dynamics of trophic niche width in animals at both population level and individual level is potentially influenced by temporal variation of food resources, by between‐individual differences in food‐resource rank preferences, and also by competition. Using stable isotope of carbon and nitrogen (δ¹³C and δ¹⁵N) of fecal samples, we investigated the trophic niche dynamics and individual variation...

article

Fire affects the occurrence of small mammals at distinct spatial scales in a neotropical savanna

Anna Carla L. Camargo, Rafaela Oliveira Llorente Barrio, Nícholas Ferreira Camargo, André F. Mendonça, more

European Journal of Wildlife Research > 2018 > 64 > 6 > 1-11

Fire is a major disturbance event that affects biomes worldwide, altering vegetation structure and flora and fauna assemblages. Here, we investigated the effects of an extensive wildfire (~ 6240 ha) on small mammal assemblages in savanna woodland (cerradão) at two spatial scales (meso- and macrohabitat) in a neotropical savanna (Brazilian Cerrado). At each spatial scale, we assessed relationships...

article

The importance of food supply in high‐productivity ecosystems: Short‐term experimental tests with small rodents

Jayme A. Prevedello, Marcus V. Vieira, Emerson M. Vieira, Chris R. Dickman

Austral Ecology > 42 > 2 > 176 - 186

Food availability is considered to be a primary factor affecting animal populations, yet few experimental tests have been performed to evaluate its actual importance in species‐rich ecosystems such as rainforests. It has been suggested that in such systems certain plant species may act as “keystone” resources for animals, but the importance of presumed keystone resources for populations has not been...

article

Optimizing land use decision-making to sustain Brazilian agricultural profits, biodiversity and ecosystem services

Christina M. Kennedy, Peter L. Hawthorne, Daniela A. Miteva, Leandro Baumgarten, more

Biological Conservation > 2016 > 204 > PB > 221-230

Designing landscapes that can meet human needs, while maintaining functioning ecosystems, is essential for long-term sustainability. To achieve this goal, we must better understand the trade-offs and thresholds in the provision of ecosystem services and economic returns. To this end, we integrate spatially explicit economic and biophysical models to jointly optimize agricultural profit (sugarcane...

article

Domestic dogs in protected areas: a threat to Brazilian mammals?

Isadora Lessa, Tainah Corrêa Seabra Guimarães, Helena de Godoy Bergallo, André Cunha, more

Natureza & Conserva��o > 2016 > 14 > 2 > 46-56

The presence of domestic dogs (Canis lupus familiaris) in Brazilian protected areas is fairly frequent. The interaction of such dogs with native animals leads to population declines for many species, particularly carnivores. In this paper the main threats dogs bring about Brazilian biodiversity are assessed with a focus on protected areas. We collected information from papers on the interaction of...

article

Diversity patterns and chronobiology of hawkmoths (Lepidoptera, Sphingidae) in the Brazilian Amazon rainforest

Amabílio J. A. Camargo, Nícholas F. Camargo, Danilo C. V. Corrêa, Willian R. F. Camargo, more

Journal of Insect Conservation > 2016 > 20 > 4 > 629-641

As biodiversity loss rapidly increases through habitat degradation in the Amazon rainforest, the need to characterize and understand the species diversity becomes even more important. In this study we used empirical and published datasets to assess the diversity patterns and produce the first overview of the sphingid fauna in the Brazilian Amazon. We compared the diversity patterns in distinct areas...

article

Adult feeding moths (Sphingidae) differ from non-adult feeding ones (Saturniidae) in activity-timing overlap and temporal niche width

Nícholas F. Camargo, Willian R. F. Camargo, Danilo Do C. V. Corrêa, Amabílio J. A. Camargo, more

Oecologia > 2016 > 180 > 2 > 313-324

According to classic ecology, resource partitioning by segregation along at least one of the three main niche axes (time, food, and space) must take place for the coexistence of species with similar ecological requirements. We used nocturnal light traps to investigate the assemblage structuration of two moth families: Sphingidae (23 species) and Saturniidae (13 species). Because competition for food...

article

Diet and trophic niche breadth of the rare acrobatic cavy Kerodon acrobata (Rodentia: Caviidae) in a seasonal environment

Alexandre Portella, Emerson M. Vieira

Mammal Research > 2016 > 61 > 3 > 279-287

We investigated diet and feeding behavior of the acrobatic cavy Kerodon acrobata, a rare caviomorph rodent endemic from the Cerrado (Brazilian savannah). We tested whether its trophic niche breadth varies between seasons and whether this species shows seasonal differences in food resource use. Feeding behavior was observed through observations of foraging activities in dry forest associated with limestone...

article

The home range and multi-scale habitat selection of the threatened maned three-toed sloth (Bradypus torquatus)

Nereyda Falconi, Emerson M. Vieira, Julio Baumgarten, Deborah Faria, more

Mammalian Biology > 2015 > 80 > 5 > 431-439

Habitat selection is a scale-dependent process of paramount importance to the understanding of how species deal with environmental variation. This process has practical implications for wildlife conservation, aiding in the identification of key resources for animals and in the definition of scales relevant to the proposal of practical conservation actions. In this study, we investigated in different...

article

Interactions between a seed‐eating neotropical rodent, the Azara's agouti (Dasyprocta azarae), and the Brazilian ‘pine’ Araucaria angustifolia

Juliana F. Ribeiro, Emerson M. Vieira

Austral Ecology > 39 > 3 > 279 - 287

We studied the seed predation and scatter‐hoarding behaviour of Azara's agoutis Dasyprocta azarae (Rodentia: Dasyproctidae) in relation to the seeds of the Brazilian ‘pine’, Araucaria angustifolia (Araucariaceae), the rodent's main winter food source. We compared seed‐removal rates, seed‐caching rates, cache distances and recovery rates between a summer period of food abundance (with a low demand...

article

Intra‐ and inter‐individual variation show distinct trends as drivers of seasonal changes in the resource use of a neotropical marsupial

Nícholas F. Camargo, Juliana F. Ribeiro, Amabílio J. A. Camargo, Emerson M. Vieira

Biological Journal of the Linnean Society > 111 > 4 > 737 - 747

Individual specialization can influence important ecological and evolutionary traits and both inter‐ and intra‐individual variation in resource use can drive niche shifts in natural populations. We evaluated the predominance of these two factors for determining seasonal differences in the trophic niche of the didelphid marsupial Gracilinanus agilis (Burmeister, 1854) in the highly seasonal Brazilian...

article

Diet of the gracile mouse opossum Gracilinanus agilis (Didelphimorphia: Didelphidae) in a neotropical savanna: intraspecific variation and resource selection

Nícholas F. Camargo, Juliana F. Ribeiro, Amabílio J. A. Camargo, Emerson M. Vieira

Mammal Research > 2014 > 59 > 1 > 183-191

Investigation of the effect of endogenous and exogenous factors on the diet of animals is necessary for a better understanding of their feeding habits. This approach can provide relevant information on the autoecology of a species and its ecological interactions. We investigated the composition and intraspecific variation in the diet of the marsupial Gracilinanus agilis in areas of dry woodland forests...

article

Population responses of small mammals to food supply and predators: a global meta‐analysis

Jayme A. Prevedello, Chris R. Dickman, Marcus V. Vieira, Emerson M. Vieira, more

Journal of Animal Ecology > 82 > 5 > 927 - 936

The relative importance of food supply and predation as determinants of animal population density is a topic of enduring debate among ecologists. To address it, many studies have tested the potential effects of food on population density by experimentally supplementing natural populations, with much focus on terrestrial vertebrates, especially small mammals.Here we perform a meta‐analysis of such...

article

Short- and long-term impacts of an introduced large herbivore (Buffalo, Bubalus bubalis L.) on a neotropical seasonal forest

Guilherme Heck Michels, Emerson M. Vieira, Flávia Nogueira Sá

European Journal of Forest Research > 2012 > 131 > 4 > 965-976

Herbivory of large mammals is a key factor influencing plant communities, with effects on plant growth, survival and reproduction. These effects may be more pronounced when the herbivores are exotic ungulates. We evaluated the impacts of buffaloes (density of 1 individual per hectare) on sapling and shrub assemblages in a semideciduous seasonal forest in southern Brazil. We also investigated whether...

article

Is footprint shape a good predictor of arboreality in sigmondontine rodents from a neotropical savanna?

Nícholas F. Camargo, Juliana F. Ribeiro, Rodrigo Gurgel-Gonçalves, Alexandre R. T. Palma, more

Mammal Research > 2012 > 57 > 3 > 261-267

We investigated the relation between the footprint shape of the fore and hind feet of sigmodontine rodents and their levels of arboreal activity. Footprint shape was obtained by analyzing the impressions left by identified animals captured in the field after being forced to pass through ink-tracking tunnels or by pressing their previously inked feet on a paper sheet. We used geometric morphometric...

article

Towards an ecologically-sustainable forestry in the Atlantic Forest

Carlos R. Fonseca, Gislene Ganade, Ronei Baldissera, Carlos G. Becker, more

Biological Conservation > 2009 > 142 > 6 > 1209-1219

Since pristine Atlantic Forest remnants are vanishing, and biological reserves are in short, conservation of biodiversity will largely depend on proper management of the anthropogenic matrix. Here, we test (1) the effectiveness of ecologically-managed tree monocultures in maintaining Araucaria Forest biodiversity, (2) how this effectiveness change among taxa, and (3) we discuss management principles...

article

Activity, habitat use, density, and reproductive biology of the crab-eating fox (Cerdocyon thous) and comparison with the pampas fox (Lycalopex gymnocercus) in a Restinga area in the southern Brazilian Atlantic Forest

Mariana Faria-Corrêa, Rodrigo A. Balbueno, Emerson M. Vieira, Thales R.O. de Freitas

Mammalian Biology > 2009 > 74 > 3 > 220-229

The ecology and reproductive biology of the crab-eating fox (Cerdocyon thous) and the pampas fox (Lycalopex gymnocercus) were studied in Itapuã State Park, an Atlantic Forest fragment. In this study we describe their activity patterns (diel, lunar, and seasonal), reproductive period, density, spatial distribution, and habitat overlap. The crab-eating fox was more abundant than the pampas fox, occurring...

article

Evaluation of methods used for diet analysis of the neotropical otter Lontra longicaudis (Carnivora, Mustelidae) based on spraints

Adriana A. Perini, Emerson M. Vieira, Uwe H. Schulz

Mammalian Biology > 2009 > 74 > 3 > 230-235

article

Activity, habitat use, density, and reproductive biology of the crab-eating fox (Cerdocyon thous) and comparison with the pampas fox (Lycalopex gymnocercus) in a Restinga area in the southern Brazilian Atlantic Forest

Mariana Faria-Corrêa, Rodrigo A. Balbueno, Emerson M. Vieira, Thales R. O. de Freitas

Mammalian Biology > 2009 > 74 > 3 > 220-229

The ecology and reproductive biology of the crab-eating fox (Cerdocyon thous) and the pampas fox (Lycalopex gymnocercus) were studied in Itapuã State Park, an Atlantic Forest fragment. In this study we describe their activity patterns (diel, lunar, and seasonal), reproductive period, density, spatial distribution, and habitat overlap. The crab-eating fox was more abundant than the pampas fox, occurring...

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INFONA - science communication portal

Search results for: Emerson M. Vieira

Increasing fire severity alters the species composition and decreases richness of seeds potentially dispersed by small mammals

Seasonal isotopic niche of a rodent: High between‐individual variation but no changes in individual niche width during the rich‐resource period

Fire affects the occurrence of small mammals at distinct spatial scales in a neotropical savanna

The importance of food supply in high‐productivity ecosystems: Short‐term experimental tests with small rodents

Optimizing land use decision-making to sustain Brazilian agricultural profits, biodiversity and ecosystem services

Domestic dogs in protected areas: a threat to Brazilian mammals?

Diversity patterns and chronobiology of hawkmoths (Lepidoptera, Sphingidae) in the Brazilian Amazon rainforest

Adult feeding moths (Sphingidae) differ from non-adult feeding ones (Saturniidae) in activity-timing overlap and temporal niche width

Diet and trophic niche breadth of the rare acrobatic cavy Kerodon acrobata (Rodentia: Caviidae) in a seasonal environment

The home range and multi-scale habitat selection of the threatened maned three-toed sloth (Bradypus torquatus)

Interactions between a seed‐eating neotropical rodent, the Azara's agouti (Dasyprocta azarae), and the Brazilian ‘pine’ Araucaria angustifolia

Intra‐ and inter‐individual variation show distinct trends as drivers of seasonal changes in the resource use of a neotropical marsupial

Diet of the gracile mouse opossum Gracilinanus agilis (Didelphimorphia: Didelphidae) in a neotropical savanna: intraspecific variation and resource selection

Population responses of small mammals to food supply and predators: a global meta‐analysis

Short- and long-term impacts of an introduced large herbivore (Buffalo, Bubalus bubalis L.) on a neotropical seasonal forest

Is footprint shape a good predictor of arboreality in sigmondontine rodents from a neotropical savanna?

Towards an ecologically-sustainable forestry in the Atlantic Forest

Activity, habitat use, density, and reproductive biology of the crab-eating fox (Cerdocyon thous) and comparison with the pampas fox (Lycalopex gymnocercus) in a Restinga area in the southern Brazilian Atlantic Forest

Evaluation of methods used for diet analysis of the neotropical otter Lontra longicaudis (Carnivora, Mustelidae) based on spraints

Activity, habitat use, density, and reproductive biology of the crab-eating fox (Cerdocyon thous) and comparison with the pampas fox (Lycalopex gymnocercus) in a Restinga area in the southern Brazilian Atlantic Forest

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