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Registros recuperados: 10
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Behavioral event occurrence differs between behavioral states in Sotalia guianensis (Cetarctiodactyla: Delphinidae) dolphins: a multivariate approach 103
Tardin,Rodrigo H.; Pinto,Míriam P.; Alves,Maria Alice S.; Simão,Sheila M..
Difficulties in quantifying behavioral events can cause loss of information about cetacean behavior, especially behaviors whose functions are still debated. The lack of knowledge is greater for South American species such as Sotalia guianensis (Van Benédén, 1864). Our objective was to contextualize the behavioral events inside behavioral states using a Permutational Multivariate Analysis of Variance (MANOVA). Three events occurred in the Feeding, Socio-Sexual and Travelling states (Porpoising, Side flop, Tail out dive), and five events occurred in the Feeding and Travelling states (Back flop, Horizontal jump, Lobtail, Spy-hop, Partial flop ahead). Three events (Belly exposure, Club, and Heading) occurred exclusively in the Socio-sexual state. Partial Back...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerial behavior; Behavioral analysis; Guiana dolphin; Surface behavior.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000100001
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Birds foraging for fruits and insects in shrubby restinga vegetation, southeastern Brazil 49
Gomes,Verônica Souza da Mota; Loiselle,Bette A.; Alves,Maria Alice S..
Understanding how birds use vegetation to obtain food resources has implications for habitat conservation and management. Restinga is a poorly known and threatened tropical habitat, associated to the Atlantic forest, that could benefit from this kind of information to know which plants can be used and dispersed by birds that can help on the maintenance of this habitat. Frugivorous and insectivorous birds are important components of tropical ecosystems, such as restinga. To provide more information regarding the ecology of restinga, we studied the feeding behavior and spatial use of this vegetation by birds at Restinga de Jurubatiba National Park, southeastern Brazil. We found that feeding behavior was similar to that recorded for the same species in other...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic forest; Behavior; Diet; Mimus gilvus; Zonotrichia capensis.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000400001
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Fenologia de Psychotria nuda e P. Brasiliensis (Rubiaceae) em uma área de Floresta Atlântica no sudeste do Brasil 39
Almeida,Elisângela Medeiros de; Alves,Maria Alice S..
Este estudo descreve os padrões fenológicos de duas espécies simpátricas, Psychotria nuda e P. brasiliensis, comparando-as quanto à fenologia e à distribuição espacial e relacionando os eventos fenológicos a fatores abióticos (pluviosidade, temperatura e fotoperíodo) e bióticos (freqüência de polinizadores e de frugívoros). O estudo foi realizado entre agosto/1998 e julho/1999 em uma área de Floresta Atlântica pouco perturbada antropicamente, na Ilha Grande, RJ. Foram feitas observações mensais das fenofases, dos visitantes florais e dos consumidores de frutos de ambas as espécies estudadas. A emissão foliar de P. nuda e de P. brasiliensis ocorreu de novembro/1998 a maio/1999, havendo correlação positiva significativa desta fenofase com o fotoperíodo, com...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Psychotria; Fenologia; Distribuição espacial; Mata Atlântica; Brasil.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062000000300010
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Gender-related diet composition and morphometry of the Restinga Antwren, Formicivora littoralis (Aves: Thamnophilidae) 103
Chaves,Flávia G.; Alves,Maria Alice S..
Formicivora littoralis (Gonzaga and Pacheco, 1990), the Restinga Antwren, considered the only endemic bird species of the Restinga ecosystem (sandy plain coastal vegetation), is threatened with extinction. The scientific literature provides little information on the biology of this bird, which was discovered in 1990. We evaluate gender-related differences in the composition of the diet and morphometric measurements of this species. We tested the hypothesis that the sexes differ in what they eat and in morphometric characters. Our results revealed that the diet of the Restinga Antwren includes mainly arthropods, which is consistent with the diets of other Thamnophilidae. The lack of differences in the composition of the diet between the sexes does not...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arthropods; Food items; Intraspecific variation; Morphometry; Restinga ecosystem.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000600003
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Heterogeneity of bird communities in a mosaic of habitats on a restinga ecosystem in southeast Brazil 103
Gomes,Verônica S. da M.; Vecchi,Maurício B.; Loiselle,Bette A.; Missagia,Caio C.C.; Alves,Maria Alice S..
ABSTRACT Restinga occurs as a narrow band of coastal habitats throughout the Atlantic Forest, although it presents considerable variation in vegetation structure, which likely contributes to heterogeneity in species inhabiting this endangered ecosystem. The goal of this study is to examine how variation in vegetation and abiotic conditions in the restinga ecosystem may contribute to heterogeneity of bird communities in Restinga de Jurubatiba, Brazil. Temperature, relative humidity, and vegetation structure were sampled to characterize four sites (dry forest, flooded forest, open scrub and closed scrub). Birds were sampled using observations, mist-netting and voice recordings. Results indicate that major differences of all variables occur between forest and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avian community; NDVI; Restinga forest; Scrub; Vegetation structure.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000500600
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Kelp gulls, Larus dominicanus (Aves: Laridae), breeding in Keller Peninsula, King George Island, Antarctic Peninsula 103
Branco,Joaquim O.; Costa,Erli S.; Araujo,Jansen de; Durigon,Edison; Alves,Maria Alice S..
We examined the distribution, abundance and density of the Kelp Gull, Larus dominicanus (Lichtenstein, 1823), at Keller Peninsula on two occasions during the breeding season of 2007-2008 (once for incubation and once for chick stages) and compared our results with previously published data. We present information on the number of eggs, incubation success, and initial development of L. dominicanus chicks in the studied sites. The abundance and density of the species has remained statistically similar in Keller Peninsula over the last 30 years (since 1978-1979). Although the abundance and density were almost unchanged, we recorded alterations in the occupation of the breeding areas by L. dominicanus, mainly the abandonment of breeding sites in the eastern...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abundance; Breeding sites; Broods development; Density; Distribution.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300021
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Missing for the last twenty years: the case of the southernmost populations of the Tropical Mockingbird Mimus gilvus (Passeriformes: Mimidae) 103
Zanon,Mariana S.; Vale,Mariana M.; Alves,Maria Alice S..
The Tropical Mockingbird Mimus gilvus (Vieillot, 1808) is a widespread species in the Neotropics, but its southernmost populations in Brazil are ecologically (and possibly taxonomically) distinct, occurring only along the coast in restinga vegetation. Once considered the most common bird in restinga, it is becoming increasingly rare, likely due to habitat loss and illegal capture of nestlings. We conducted field surveys to provide an up-to-date distribution of the Tropical Mockingbird in the southernmost portion of the species' range, in the state of Rio de Janeiro, supplying an estimate of its current regional population size and conservation status. We surveyed 21 restinga remnants in Rio de Janeiro, covering all major restinga areas in the state. For...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazil; Conservation status; IUCN; Restinga; Rio de Janeiro.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000100001
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Molecular sexing and intersexual differences in the morphometry of the Hangnest Tody-Tyrant Hemitriccus nidipendulus (Passeriformes: Rhynchocyclidae) 103
Medeiros,Reinaldo T.; Chaves,Flávia G.; Vecchi,Maurício B.; Nogueira,Denise M.; Alves,Maria Alice S..
ABSTRACT Variation in the morphometry of individuals in a population may result from natural or sexual selection. In the present study we investigated morphometric differences between males and females of a bird species endemic to the Brazilian Atlantic Forest, the Hangnest Tody-Tyrant, Hemitriccus nidipendulus (Wied, 1831), with no apparent sexual dimorphism. All individuals (n = 56) were sexed by PCR amplification of the intronic fragments of the CHDZ/CHDW alleles obtained from blood samples, and 12 morphometric measurements were recorded. The molecular configuration was similar to that described for other species of Passeriformes, with males presenting a single band of approximately 360 base pairs (bp), and females with two bands of 360 and 400 bp....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic Forest; Gender differences; Molecular sexing; Restinga; Sexual monomorphism.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702019000100329
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The rate of visitation by Amazilia fimbriata (Apodiformes: Trochilidae) influences seed production in Tillandsia stricta (Bromeliaceae) 103
Missagia,Caio C.C.; Alves,Maria Alice S..
Legitimate flowers visitors pollinate the flower during the visit and thus influence the production of fruits and seeds. We tested whether the visitation rate of potential pollinators is associated with the amount of seeds per fruit produced by the self-compatible bromeliad Tillandsia stricta (Bromeliaceae). We determined whether hummingbirds are legitimate visitors by testing for a correlation between visits and pollination (seed production) at the Guapiaçú Ecological Reserve (Reserva Ecológica de Guapiaçú), state of Rio de Janeiro. We tested 30 flowers, five of which were also monitored to test the possibility of spontaneous self-pollination. The remaining 25 flowers were exposed to floral visitors. Twenty-two flowers formed fruits and seeds, from which...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Atlantic forest; Hummingbird; Pollination; Self-compatibility.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000300260
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Water depth selection during foraging and efficiency in prey capture by the egrets Casmerodius albus and Egretta thula (Aves, Ardeidae) in an urban lagoon in Rio de Janeiro State, Brazil 76
Moreno,Aline B.; Lagos,Adriano R.; Alves,Maria Alice S..
This study aimed to evaluate the water depth selection during foraging, the efficiency in prey capture, and the food items captured by Casmerodius albus (Linnaeus, 1758) and Egretta thula (Molina, 1782). The work was conducted at an urban lagoon, Lagoa Rodrigo de Freitas, Rio de Janeiro. Four transects were made each month (two in the morning and two in the afternoon) for six months. When the birds were detected foraging, the water depth and the types of prey captured were recorded. There was no significant relationship between the foraging efficiencies of the two species. However, they differed in relation to the water depth when foraging, and also in the food items captured. Casmerodius albus captured mainly fishes while Egretta thula captured mainly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Foraging depth; Casmerodius albus; Egretta thula; Lagoa Rodrigo de Freitas.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212005000100016
Registros recuperados: 10
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