Niche Specialization
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. The flower flies and the unknown diversity of Drosophilidae (Diptera): a biodiversity inventory in the Brazilian fauna
Abstract Diptera is a megadiverse order, reaching its peak of diversity in Neotropics, although our knowledge of dipteran fauna from this region is grossly lacking. This applies even to the most studied families, such as Drosophilidae. Despite its prominence, most aspects of the biology of these insects are still poorly understood, especially those linked to
Pap. Avulsos Zool.. Publicado em: 21/10/2019
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2. Effect of oil palm (Elaeis guineensis Jacq.) plantations on individual-level diet variation of Hylaeamys megacephalus (G. Fisher 1814) (Rodentia, Cricetidae) in eastern Amazon Forest
Resumo: Neste estudo nós descrevemos a dieta de Hylaeamys megacephalus (G. Fisher, 1814) e investigamos o grau de variação individual na dieta desta espécie entre os hábitats de Floresta Amazônica e Plantação de Palmeira de Dendê. Analisamos o conteúdo estomacal de 36 indivíduos, dos quais 11 foram coletados na floresta e 25 capturados na plantaç
Biota Neotrop.. Publicado em: 28/03/2019
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3. The feeding habits of the eyespot skate Atlantoraja cyclophora (Elasmobranchii: Rajiformes) in southeastern Brazil
The stomach contents of the eyespot skate, Atlantoraja cyclophora (Regan, 1903), were examined with the goal to provide information about the diet of the species. Samples were collected off the southern coast of Rio de Janeiro, Brazil, near Ilha Grande, between January 2006 and August 2007, at a depth of about 60 m. The diet was analyzed by sex, maturity sta
Zoologia (Curitiba). Publicado em: 2014-04
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4. Feeding ecology of stream-dwelling Characidae (Osteichthyes: Characiformes) from the upper Tocantins River, Brazil
In this contribution we studied the trophic ecology of four Characidae species from the Cavalo Stream, upper Tocantins River, considering diet overlap and trophic niche breadth. The diet of the four species was composed of adult and immature insects, both autochthonous and allochthonous in origin. Autochthonous items dominated the diet of Moenkhausia dichrou
Zoologia (Curitiba). Publicado em: 06/12/2013
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5. Ecologia alimentar da toninha Pontoporia blainvillei (Cetacea) / Feeding ecology of franciscana dolphin Pontoporia blainvillei (Cetacea)
Ecological niche theory is originally based on the assumption that individuals of a species use similar resources and therefore are ecologically equivalents. Under this framework, the niche of the species can be defined in terms of average resource use. However, factors such as quality and quantity of prey resources in the environment, consumer gender, age o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/12/2011
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6. Determinantes ecológicos do risco de extinção: abundância local, amplitude de nicho, capacidade de dispersão e a resposta das espécies de pequenos mamíferos à fragmentação florestal no Planalto Atlântico Paulista / Ecological determinants of extinction risk: local abundance, niche breadth, dispersal ability and response of small mammals to forest fragmentation at the Atlantic Plateau of São Paulo
Anthropogenic disturbances, particularly habitat loss and fragmentation, are considered the main causes of the increased extinction rates observed in the last decades. Since the risk of extinction is extremely variable among species, the ecological determinants of the chance of extinction have been in the center of the debates in the ecological literature. E
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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7. Ecologia trófica e ecomorfologia da ictiofauna de igarapés maranhenses
The trophic ecology is one of the most important aspects to understand the role of a species in the community and in the ecosystem functioning. Studies regarding the feeding of fishes coupled to the ecomorphology of a species become important tools in understanding their ecological role and position in the environment. The present study aimed to analyze the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/06/2011
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8. Tamaño poblacional, uso del hábitat y relaciones interespecíficas de Agalychnis spurrelli (anura: hylidae) en un bosque húmedo tropical remanente del noroccidente de Ecuador
Throughout 2006 and 2007, at a small swamp in San Francisco del Cabo, northwestern Ecuador, monthly field expeditions were done to monitor a population of the leaf frog Agalychnis spurrelli with the following aims: (1) to determine population size and annual fluctuation; (2) to determine spatial distributional patterns and microhabitat resource partitioning;
Papéis Avulsos de Zoologia (São Paulo). Publicado em: 2011
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9. Subpatótipos de Escherichia coli patogênica para aves (APEC) podem estar associados às síndromes infecciosas infecciosas causadas no hospedeiro / Subpathotypes of avian pathogenic Escherichia coli (APEC) exist as definid by their syndromes of isolation and virulence traits
Avian Pathogenic Escherichia coli (APEC) cause different types of systemic extraintestinal infections in poultry, which are collectively termed colibacillosis, imposing significant economic casses for the avian industry Among these diseases are septicaemia, omphalitis, cellulites and swollen head syndrome. However, to the date, there is no description of gen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/10/2010
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10. First come, first serve: " sit and wait" behavior in dung beetles at the source of primate dung
Dung beetles (Coleoptera: Scarabaeidae: Scarabaeinae) compete intensively for dung resources, and most species forage in the understory. Here, we describe the unique behavior of one dung beetle species, Canthon aff. quadriguttatus (Olivier), associated with two species of monkeys from Peru. We observed this beetle species on the genital and anal regions of t
Neotropical Entomology. Publicado em: 2008-12
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11. Trophic niche of Tropidurus hispidus (Sauria: Tropiduridae) in restinga environment / Nicho trofico de Tropidurus hispidus (Sauria: Tropiduridae) em ambiente de restinga
The diet is one of the main atributes of the ecological niche of animal species. Generally, the individuals of a population are considered ecologically equivalent in ecological studies that focus on resource use. Nevertheless, this approach has been inadequate to correctly describe resource use by various species, as demonstrated by empirical data. Intrapopu
Publicado em: 2008
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12. Interindividual variation in resource use in natural populations : new patterns and implications / Variação interindividual no uso de recursos em populações naturais : novos padrões e implicações
A teoria ecológica clássica, em especial a teoria de nicho, foi construída sob a suposição de que os indivíduos de uma população são equivalentes em termos da utilização de recursos. Entretanto, é sabido que os indivíduos de uma população podem variar no uso de recursos e que essa variação pode ter importantes implicações ecológicas e evo
Publicado em: 2007