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Search Results: 1 - 10 of 22559 matches for " Itamar Alves;Rossa-Feres "
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Bioacústica e sítio de vocaliza??o em taxocenoses de anuros de área aberta no noroeste paulista
Silva, Rodrigo Augusto;Martins, Itamar Alves;Rossa-Feres, Denise de Cerqueira;
Biota Neotropica , 2008, DOI: 10.1590/S1676-06032008000300012
Abstract: the calling site and the acoustic parameters of the advertisement call were determined for 18 anuran species in six ponds in the northwest region of s?o paulo state. the dominant frequency of the advertisement call was positively correlated with the crc of the species: small size species vocalized in a higher frequency, whereas larger species vocalized in a lower frequency. the similarity in the spectral and temporal parameters of the advertisement call was high among 94% of the recorded species. the similarity on calling site was low; only 22% of species presented high overlap, in spite of about a half of the species have been generalist in calling site use. analysing simultaneously the similarity on calling site, habitat and advertisement call parameters, the proportion of species with high overlap decreased from 94 to 11%, corresponding to the overlap between a single pair of species: dendropsophus elianeae and d. minutus. the species that overlap in calling site presented segregation in acoustic parameters, and those that overlap in acoustic parameters tended to partition the calling site. this result suggests the occurrence of niche complementarity, since species that occupied a similar position in one dimension tended to differ in another dimension. the structural homogeneity of ponds, the climatic severity of the region and the high degree of habitat loss restrict the abundance of population and the species richness of the anuran assemblages. the low overlap on the calling site is probably associated with the insaturation of the sampled communities.
Environmental heterogeneity: Anuran diversity in homogeneous environments
Silva, Rodrigo Augusto;Martins, Itamar Alves;Rossa-Feres, Denise de C.;
Zoologia (Curitiba) , 2011, DOI: 10.1590/S1984-46702011000500009
Abstract: the northwestern region of s?o paulo was extensively deforested during the agricultural expansion in the last century and only small fragments of the original vegetation cover remained. in this study, we investigated how habitat features influence the composition, richness, and diversity of anurans in environments homogenized by agricultural activities. we sampled monthly six breeding ponds located in pasture areas during twelve months. we recorded ten environmental descriptors for each breeding pond. we found 18 anuran species. the breeding ponds were structurally similar, but species composition differed among them. the environmental descriptors influence varies for each species, as demonstrated by the different associations between species and environmental descriptors shown in the canonical correspondence analysis (cca). seven of the ten environmental descriptors explained 67% of the species richness, showing that environmental characteristics influenced the occurrence of the different species. there is no such data set for the region and also for most brazilian regions, despite its importance in guiding species-oriented conservation actions.
Diets of tadpoles from a temporary pond in southeastern Brazil (Amphibia, Anura)
Rossa-Feres, Denise de C.;Jim, Jorge;Fonseca, Mariluce Gon?alves;
Revista Brasileira de Zoologia , 2004, DOI: 10.1590/S0101-81752004000400003
Abstract: the diet of tadpoles of 13 anuran species was determined to verify whether food resource partitioning occurs and whether the degree of diet similarity is related to taxonomic affinity. tadpoles of all species studied were mainly herbivorous, except for these of leptodactylus fuscus (schneider, 1799) which were mycophagous. although some species had exclusive items in their diet, most tadpole species ingested the same items, but differed in the amount of each item consumed. two guilds were found: tadpoles that feed on diatoms on the pond bottom, and tadpoles that feed on oedogonium link, 1820 algae in midwater. diet similarity was related to the taxonomic relationship, microhabitat and feeding behavior of tadpoles indicating that the community organization is complex and resulting from the interaction of several parameters.
Reproductive behavior and seasonal occurrence of Psecas viridipurpureus (Salticidae, Araneae)
ROSSA-FERES, D. de C.;ROMERO, G. Q.;GON?ALVES-DE- FREITAS, E.;FERES, R. J. F.;
Revista Brasileira de Biologia , 2000, DOI: 10.1590/S0034-71082000000200005
Abstract: the reproductive behavior and the seasonal occurrence of psecas viridipurpureus were studied at the esta??o ecológica do noroeste paulista, a small conservation area in the northwest region of s?o paulo state, brazil (49°22'50''w and 20°48'36''s). p. viridipurpureus occurred on "gravatá", a bromeliaceous plant (bromelia balansae, bromeliaceae) which does not accumulate rain water. during the courtship display the couple occupied the median region of the "gravatá" leaves, with the male always located in a higher position than the female. the males of p. viridipurpureus showed a complex courtship behavior, which included five motor patterns. the courtship and mating behavior occurred preponderantly during the rainy season and the juvenile recruitment between december and july. the retreat of p. viridipurpureus differs from the salticidae pattern, since the egg sacs are covered with a plain silk cover and are not wrapped in cocoons.
Reproductive behavior and seasonal occurrence of Psecas viridipurpureus (Salticidae, Araneae)
ROSSA-FERES D. de C.,ROMERO G. Q.,GON?ALVES-DE- FREITAS E.,FERES R. J. F.
Revista Brasileira de Biologia , 2000,
Abstract: The reproductive behavior and the seasonal occurrence of Psecas viridipurpureus were studied at the Esta o Ecológica do Noroeste Paulista, a small conservation area in the northwest region of S o Paulo State, Brazil (49°22'50''W and 20°48'36''S). P. viridipurpureus occurred on "gravatá", a bromeliaceous plant (Bromelia balansae, Bromeliaceae) which does not accumulate rain water. During the courtship display the couple occupied the median region of the "gravatá" leaves, with the male always located in a higher position than the female. The males of P. viridipurpureus showed a complex courtship behavior, which included five motor patterns. The courtship and mating behavior occurred preponderantly during the rainy season and the juvenile recruitment between December and July. The retreat of P. viridipurpureus differs from the Salticidae pattern, since the egg sacs are covered with a plain silk cover and are not wrapped in cocoons.
Uso de fragmentos florestais por anuros (Amphibia) de área aberta na regi?o noroeste do Estado de S?o Paulo
Silva, Fernando Rodrigues da;Rossa-Feres, Denise de Cerqueira;
Biota Neotropica , 2007, DOI: 10.1590/S1676-06032007000200016
Abstract: landscape arrangement plays a key role in community structure and composition. our study was based on the hypothesis that forest fragments work as shelter areas for open-area anuran species. four forest fragments were studied in the municipality of icém, northwestern s?o paulo state; the fragments were 1 to 4 km apart from each other. the anurans were sampled in the fragments by pitfalls, artificial shelters, and active search. twelve species were registered (48% of the species known for the region); three of these species (eupemphix nattereri, leptodactylus podicipinus, and physalaemus cuvieri) had high abundance (n > 50 individuals). in the pitfalls, 228 individuals belonging to 10 anuran species were captured. the high richness and abundance of specimens captured mean that forest fragments are important components for the anuran communities. forest fragments in the icém region can be used by anurans in three non-exclusive ways: i) as shelter areas during the dry season (five species registered); ii) as day shelters during the anuran reproductive season (six species registered in artificial shelters during the day, throughout the rainy season); and iii) as foraging areas (one specimen of leptodactylus podicipinus found feeding on blattaria in the fragment fm2). therefore, the preservation of anuran populations of open habitats depends, to the same extent, on terrestrial habitats, such as forest fragments, and on the ponds where they reproduce.
Characterization and taxonomic key for tadpoles (Amphibia: Anura) from the northwestern region of S?o Paulo State, Brazil
Rossa-Feres, Denise de Cerqueira;Nomura, Fausto;
Biota Neotropica , 2006, DOI: 10.1590/S1676-06032006000100014
Abstract: difficulties in species identification and the absence of taxonomic keys are several of the obstacles in elaborating adequate conservation, management and habitat recovery programs. this study provides a taxonomic key, morphological characterization, and drawings for the 22 known anuran tadpoles from the northwestern region of s?o paulo state, southeastern brazil. specimens of all species analyzed are deposited in the scientific amphibian collection of universidade estadual paulista (dzsjrp), s?o josé do rio preto, sp.
Diversidade, distribui??o espacial e temporal de anfíbios anuros (Amphibia, Anura) na regi?o noroeste do estado de S?o Paulo, Brasil
Vasconcelos, Tiago da Silveira;Rossa-Feres, Denise de C.;
Biota Neotropica , 2005, DOI: 10.1590/S1676-06032005000300010
Abstract: the richness and abundance of adults and tadpoles of anuran amphibians were studied during 15 months in ten water bodies, in nova itapirema, s?o paulo, brazil, region that was intensively impacted by agricultural activities. twenty-seven species of anurans were registered, and among them four species were new records for this region. most species are typical from open areas, and the higher richness and species diversity were found in lentic water bodies. however, due to the few water bodies in fragments of riparian forest, comparisons among water bodies in open area and in fragments of riparian forest were not possible. six descriptors of water bodies heterogeneity were determined, but no one was related with the species richness. on the other hand, both richness and abundance of species were strongly correlated with climatic variables. the species composition (b diversity) was similar among the water bodies, which probably reflect the great niche breadth, typical of species from unstable or modified environments. the anuran richness observed in the studied region is similar to other localities where the level of environmental conservation is higher, as the esta??o ecológica de águas emendadas (federal district) and the floresta nacional de silvania (goiás).
Riqueza e distribui??o espa?o-temporal de anuros em um remanescente de Floresta de Araucária no sudeste do Paraná
Conte, Carlos E.;Rossa-Feres, Denise de C.;
Revista Brasileira de Zoologia , 2007, DOI: 10.1590/S0101-81752007000400020
Abstract: species richness, spatial distribution and the seasonal occurrence of anurans (adults and tadpoles) were studied throughout 15 months in an araucaria forest remnant at fazenda rio grande, paraná state, brazil. thirty-two species were registered, which corresponds to the third largest anuran richness in paraná state. the spatial distribution of the species was not uniform between habitats sampled: 46% of the species were associates with opened areas, occurring exclusively in habitats of open areas and/or in forest edges, 34% were associated with forest habitats, occurring, in habitats forest and/or forest edge, while that 13% were classified as generalists as they occurred in open formations, at the edge and interior of the forest fragments. the reproductive period of the species was correlated with rainfall, since 80% of the species were found in breeding activity the rainy season. about 40% of the registered anuran species were associated on the habitat features provided by the forest cover which reinforces the importance of conservation of araucaria forest remnants.
Diversidade e ocorrência temporal da anurofauna (Amphibia, Anura) em S?o José dos Pinhais, Paraná, Brasil
Conte, Carlos E.;Rossa-Feres, Denise de C.;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000100008
Abstract: the atlantic forest is the biome with the largest biodiversity and endemism rate of anuran amphibians in the world. however, information on natural history and patterns of occurrence are still unknown for most of the species that occur in this biome. in this study the diversity and the seasonal occurrence of anuran amphibians were determined in an ecotone area between atlantic forest and araucaria forest, in the southeastern of paraná state. in the survey, accomplished from january 2003 to may 2004, 34 species from five families were registered: bufonidae (two species), hylidae (17 species), leptodactylidae (13 species), microhylidae (one species) and ranidae (one species). the species richness is one of the largest of paraná state and eight of the nine studied sites presented high diversity of species. the fact that the studied area is located in an ecotone supports the occurrence of typical species from two physiognomies. besides, an additional hypothesis to explain this great diversity is the intermediate disturbance due to the deforestation that occurred until thirty years ago, which made the occurrence of some typical species from open areas possible. the largest number of species (48%) occurred during the rainy season, however, the proportion of annual species was great (25%), similar to the one found in regions with wet tropical climate (30%). the similarity in species composition among nine localities in atlantic forest in paraná state was associated to the vegetal physiognomy of the studied areas.
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