777 results match your criteria Brazilian Journal Of Biology[Journal]


Insect mortality in Spathodea campanulata Beauv. (Bignoniaceae) flowers.

Rev Bras Biol 2000 Aug;60(3):537-8

Departamento de Zoologia, Instituto de Biologia, Campinas, São Paulo, Brazil.

View Article

Download full-text PDF

Source

Phytophilous chironomidae (Diptera) and other macroinvertebrates in the ox-bow Infernão Lake (Jatai Ecological Station, Luiz Antonio, SP, Brazil).

Rev Bras Biol 2000 Aug;60(3):527-35

Depto de Hidrobiologia, UFSCar, Sao Carlos, SP, Brazil.

Infernão Lake, located within the Jataí Ecological Station in Luiz Ant nio Municipal district (São Paulo State, Brazil), is one of the most typical ox-bow lake of the Mogi-Guaçu River, and it presents, as the main feature, its great quantity of aquatic macrophytes, whose intensive development, in the last years practically covered the whole mirror of water. With the purpose to point out the composition and to establish the relative participation of the phytophilic zoocoenosis that inhabits the different macrophytes of that lake, a collection program of the main vegetation stands was established. The collections, were carried out randomly, during dry season (1994), in stands of Salvinia auriculata, Utricularia sp. Read More

View Article

Download full-text PDF

Source
August 2000
4 Reads

Description and prevalence of Thynnascaris sp. larvae Dollfus, 1933 (Nematoda: Anisakidae) in plagioscion squamosissimus heckel, 1840 from Volta Grande Reservoir, State of Minas Gerais, Brazil.

Rev Bras Biol 2000 Aug;60(3):519-26

Laboratório de Patologia de Organismos Aquáticos, Centro de Aqüicultura, UNESP, Jaboticabal, SP, Brazil.

The present work studied helminth parasites of freshwater "corvina" Plagioscion squamosissimus from Volta Grande Reservoir, MG, Brazil. Sixty eight fishes with averages of 25.2 cm length and 180. Read More

View Article

Download full-text PDF

Source

Feeding biology of a guild of benthivorous fishes in a sandy shore on south-eastern Brazilian coast.

Rev Bras Biol 2000 Aug;60(3):511-8

Departamento de Zoologia and Museu de História Natural, Universidade Estadual de Campinas, São Paulo, Brazil.

The feeding biology of eight species of benthivorous fishes was studied in a sandy shore at Anchieta Island, south-eastern Brazilian coast. The fishes fed mainly on Amphipoda and Mysidacea crustaceans. The diet of the most abundant species, the drum Umbrina coroides, was analyzed in three standard length classes (20-55, 56-90 and 91-135 mm). Read More

View Article

Download full-text PDF

Source
http://www.scielo.br/pdf/rbbio/v60n3/3938.pdf
Web Search

Natural history of Ctenus medius Keyserling, 1891 (Araneae, Ctenidae) I: observations on habitats and the development of chromatic patterns.

Rev Bras Biol 2000 Aug;60(3):503-9

Departamento de Museologia, Centro Universitiário de Barra Mansa, RJ, Brazil.

Ctenus medius Keyserling, 1891 is a common species in several spots of Mata Atlântica, however there is a great lack of studies in all aspects of its natural history. This work aims to elucidate aspects of ecotope preference compared to large spiders, and to provide data on the development of chromatic patterns during its life cycle. The observations on the behavior of C. Read More

View Article

Download full-text PDF

Source

Structural and morphological features of Piaractus mesopotamicus (Holmberg, 1887) gills.

Rev Bras Biol 2000 Aug;60(3):493-501

Departamento de Pesca, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil.

The pacu Piaractus mesopotamicus (Holmberg, 1887), is a commercially important serrasalmid fish endemic to the Paraná-Paraguay River basin, and one of the most widely cultivated native fish species in the Neotropics. As a migratory species, also inhabiting temporary pools subjected to hypoxic conditions, the species presents a high plasticity concerning respiratory adaptations. In order to supplement basic knowledge on the respiratory physiology and morphology of this species, some structural features of pacu gills, such as filament and lamellae structure, and circulatory pattern are described in this paper. Read More

View Article

Download full-text PDF

Source

Reproductive cycle of hepatus pudibundus (Herbst, 1785) (Crustacea, Decapoda, Calappidae) in Ubatuba, SP, Brazil.

Rev Bras Biol 2000 Aug;60(3):483-91

Centro de Ensino e Pesquisa do Litoral Paulista, Unesp, São Vicente, SP, Brazil.

This study aimed to analyze the reproductive cycle of the crab Hepatus pudibundus (Herbst, 1785). The crabs were collected in Ubatuba, SP (23 degrees 26'S and 45 degrees 02'W) monthly from the July, 1992 to June, 1993. Samplings were performed with an "otter trawl". Read More

View Article

Download full-text PDF

Source

Regression equations between body and head measurements in the broad-snouted Caiman (Caiman latirostris).

Authors:
L M Verdade

Rev Bras Biol 2000 Aug;60(3):469-82

Laboratório de Ecologia Animal, ESALQ, Universidade de São Paulo, Piracicaba, SP, Brazil.

In the present study, regression equations between body and head length measurements for the broad-snouted caiman (Caiman latirostris) are presented. Age and sex are discussed as sources of variation for allometric models. Four body-length, fourteen head-length, and ten ratio variables were taken from wild and captive animals. Read More

View Article

Download full-text PDF

Source

Raptors and "campo-cerrado" bird mixed flock LED BY Cypsnagra hirundinacea (Emberizidae:Thraupinae).

Authors:
J Ragusa-Netto

Rev Bras Biol 2000 Aug;60(3):461-7

IB, UNESP, Rio Claro, SP, Brazil.

Bird mixed flocks including Cypsnagra hirundinacea and Neothraupis fasciata as species with sentinels were studied in "campo-cerrado" in order to investigate the possible relationship between alertness and the mixed flock leadership. This study was conducted from March to September 1996 and mixed flocks were observed on average for 2:30h. The time with sentinels were recorded for C. Read More

View Article

Download full-text PDF

Source

Improvement of silver impregnation technique (protargol) to obtain morphological features of protists ciliates, flagellates and opalinates.

Rev Bras Biol 2000 Aug;60(3):451-9

Departamento de Zoologia, Instituto de Biologia, CCS, Universidade Federal do Rio de Janeiro, Ilha do Fundão, RJ, Brazil.

The research on ciliates, flagelates and opalinates have been widespread by the utilization of techniques employing silver impregnation (protargol), modified by several authors. However, these are time consuming and its results are variable. The present work is a variant of the technique described by Tuffrau (1964, 1967) showing some adaptations made in our laboratory. Read More

View Article

Download full-text PDF

Source

Biological observations on Tupiperla (Plecoptera: Gripopterygidae).

Authors:
C G Froehlich

Rev Bras Biol 2000 Aug;60(3):447-50

Departamento de Biologia, FFCLRP, USP, Ribeirão Preto, SP, Brazil.

Tupiperla illiesi fly along the year in the coastal mountains of southeastern Brazil, with larger numbers during the warmer rainy season. In the seasonal tropical climate of Central Brazil and Serra do Cipó, MG, T oliveirai and T. gracilis, respectively, fly along the year but the pattern is still not known. Read More

View Article

Download full-text PDF

Source

Characterization of the fishes and of subsistence fishing in the Pantanal of Mato Grosso, Brazil.

Rev Bras Biol 2000 Aug;60(3):435-45

Master Course in Ecology and Conservation of Biodiversity, Federal University of Mato Grosso, Cuiabá, MT, Brazil.

Fishing is one of the oldest human activities in the Pantanal of Mato Grosso in Central Brazil. In the of Bento Gomes River Basin (Pantanal of Poconé) the presence of fishermen is very common. The objective of this study is to describe the fishing activity in the basin in view of the elaboration of proposals for the sustainable use of this natural resource. Read More

View Article

Download full-text PDF

Source
http://www.scielo.br/pdf/rbbio/v60n3/3930.pdf
Web Search

Androlaelaps rotundus Fonseca (Acari: Laelapidae) associated with akodontine rodents in Paraguay: a morphometric examination of a pleioxenous ectoparasite.

Rev Bras Biol 2000 Aug;60(3):425-34

Department of Biology, University of Central Arkansas, Conway 72035, USA.

A multivariate analysis of morphometric data suggests that the nominally pleioxenous ectoparasite, Androlaelaps rotundus, includes at least three distinct host-associated populations in Paraguay. Where multiple akodontine hosts occur sympatrically, each host species is accompanied by a morphologically distinct mite population. These host-mite associations were consistent across all localities, implying that A. Read More

View Article

Download full-text PDF

Source

Estimation of population profiles of two strains of the fly Megaselia scalaris (Diptera: Phoridae) by bootstrap simulation.

Rev Bras Biol 2000 Aug;60(3):415-24

Departamento de Ciências de Computação e Estatística, IBILCE, UNESP, São José do Rio Preto, SP, Brazil.

Based on experimental population profiles of strains of the fly Megaselia scalaris (Phoridae), the minimal number of sample profiles was determined that should be repeated by bootstrap simulation process in order to obtain a confident estimation of the mean population profile and present estimations of the standard error as a precise measure of the simulations made. The original data are from experimental populations founded with SR and R4 strains, with three replicates, which were kept for 33 weeks by serial transfer technique in a constant temperature room (25 +/- 1.0 degrees C). Read More

View Article

Download full-text PDF

Source

Chemotaxis and chemical defenses in seaweed susceptibility to herbivory.

Rev Bras Biol 2000 Aug;60(3):405-14

Departamento de Biologia Marinha, Instituto de Biologia, Universidade Federal Flumimense, Niterói, Rio de Janeiro, Brazil.

Recent studies have show that small marine herbivores with limited mobility (mesograzers) often feed on macroalgae chemically defended against fishes or sea-urchins. In order to verify the involved mechanisms of chemotaxis or chemical defense into this process in Brazilian littoral, two species of brown alga Dictyota menstrualis and Dictyota mertensii were studied against the limited mobility herbivores, the amphipod Parhyale hawaiensis and the crab Pachygrapsus transversus. These two species were studied in order to verify the action of their crude extracts in the defense and chemotaxis processes related to limited mobility of these herbivores. Read More

View Article

Download full-text PDF

Source
August 2000
1 Read

Trophic structure of fish assemblages in the lower Miranda River, Pantanal, Mato Grosso do Sul State, Brazil.

Authors:
E K de Resende

Rev Bras Biol 2000 Aug;60(3):389-403

Centro de Pesquisa Agropecuária do Pantanal, EMBRAPA, Corumbá, MS, Brazil.

Of a total of 101 fish species caught in the Lower Miranda River floodplain, 29 were omnivorous, 16 ichthyophagous, 12 herbivorous, 18 detritivorous, 8 zooplanktophagous, 7 insectivorous, 2 lepidophagous, 4 ichthyophagous/insectivorous and 4 zooplanktophagous/insectivorous. Almost half of the species belong to omnivorous and detritivorous trophic guilds. The same is not true when biomass is considered. Read More

View Article

Download full-text PDF

Source

Estimating parasitoid immature mortality by comparing oviposition and pupal development of Trichogramma galloi Zucchi and T. pretiosum Riley on natural and factitious hosts.

Rev Bras Biol 2000 Aug;60(3):381-7

Departamento de Entomologia, ESALQ/USP, Piracicaba, SP, Brazil.

Mortality during the immature development of T. galloi and T. pretiosum was estimated on UV-killed and live eggs of a factitious and a natural host, respectively. Read More

View Article

Download full-text PDF

Source

Influence of photoperiod on the uptake of nitrogen and phosphorus in the water by Eichhornia crassipes and Salvinia auriculata.

Rev Bras Biol 2000 Aug;60(3):373-9

Universidade Federal do Rio de Janeiro, Instituto de Biologia, Departamento de Ecologia, Cidade Universitária, RJ, Brazil.

The main goal of this research was to quantify the concentrations of total and ammonium N, nitrate, total and soluble P in the water in the presence of Eichhornia crassipes and Salvinia auriculata, which were submitted to two different photoperiods in a 24 hours incubation period in the laboratory. The macrophytes were incubated in plastic vials of approximately 1.5 litters, with a previously prepared solution with NH4NO3, NH4Cl, and KH2PO4. Read More

View Article

Download full-text PDF

Source

Environmental education praxis toward a natural conservation area.

Rev Bras Biol 2000 Aug;60(3):361-72

PPG-ERN, UFSCar, Rod. Washington Luiz, Sao Carlos, SP.

A non-formal Environmental Education (EE) Program has been implemented in the natural conservation area (Ecological Station of Jataí, Luiz Ant nio, São Paulo State), through (EE) paradigms, which consider the objectives of education about, in and for the environment within cultural and natural perspectives. The aim of this Program is to support information and scientific knowledge to provide opportunities to the local population to be aware of environmental impacts and risks resulting from the soil use that threaten the environmental quality and the bio diversity of the Ecological Station of Jataí. The Program understands that the promotion of community empowerment could bring the sense of participation and the directives to management for decision-making for local sustainable. Read More

View Article

Download full-text PDF

Source

Changes in lactate dehydrogenase and malate dehydrogenase activities during hypoxia and after temperature acclimation in the armored fish, Rhinelepis strigosa (Siluriformes, Loricariidae).

Rev Bras Biol 2000 May;60(2):353-60

Universidade Federal de São Carlos, Departamento de Ciências Fisiológicas, SP, Brazil.

Lactate (LDH) and malate dehydrogenase (MDH) of white skeletal muscle of fishes acclimated to 20, 25 and 30 degrees C and thereafter submitted to hypoxia were studied in different substrate concentrations. Significant differences for LDH and MDH of white muscle enzyme activities are described here for the first time in Rhinelepis strigosa of fishes acclimated to 20 degrees C and submitted to hypoxia for six hours. LDH presented a significant decrease in enzyme affinity for pyruvate in acute hypoxia, for fishes acclimated to 20 degrees C and an increase for fishes acclimated to 30 degrees C. Read More

View Article

Download full-text PDF

Source

Ontogenetic patterns and genetic variation in Anopheles (Anopheles) intermedius Chagas, 1908 and Anopheles (Anopheles) mattogrossensis Lutz & Neiva, 1911 (Diptera: Culicidae) in the Brazilian amazon.

Rev Bras Biol 2000 May;60(2):341-51

INPA/CPCS, Manaus, AM, Brazil.

Changes in the expression of genes were observed during development in populations of Anopheles (Anopheles) intermedius and Anopheles (Anopheles) mattogrossensis. Esterase showed seven zones of activity: EST1 was present in all developmental stages of both species; EST2 was observed only in larvae of A. intermedius and larvae and pupae of A. Read More

View Article

Download full-text PDF

Source

The karyotype of the parasitoid Chelonus insularis Cresson (Hymenoptera, Braconidae, Cheloninae).

Rev Bras Biol 2000 May;60(2):337-9

Departamento de Biologia Geral, Universidade Federal de Viçosa, MG, Brazil.

The karyotype of Chelonus insularis (Hymenoptera, Braconidae, Cheloninae) is described. The males show an haploid number of seven chromosomes and the females a diploid number of fourteen chromosomes, confirming haplo-diploid sex determination. Comparisons of these results with karyotypes of other species of the same family were done and a possible mechanism involved in the karyotype evolution of this species is discussed. Read More

View Article

Download full-text PDF

Source

Monochromatic and polychromatic visual backgrounds influence the response of area 17 and 18 neurons after stimulation with stationary and moving light bars.

Authors:
H J Koch

Rev Bras Biol 2000 May;60(2):329-36

Department of Psychiatry, University Clinic Regensburg, Germany.

The role of colour vision in night-active cats has not been elucidated completely hitherto. In order to assess the colour sensitivity in cat cortical neurons we used large isoluminant computer-generated monochromatic and polychromatic background stimuli which were superimposed on moving and stationary (on/off) light bars. Background stimuli were moved at different speeds either inphase or antiphase. Read More

View Article

Download full-text PDF

Source

The importance of glucose for the freezing tolerance/intolerance of the anuran amphibians Rana catesbeiana and Bufo paracnemis.

Rev Bras Biol 2000 May;60(2):321-8

Departamento de Fisiologia, Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo, Brazil.

Several species of terrestrially hibernating frogs, turtles and insects have developed mechanisms, such as increased plasma glucose, anti-freeze proteins and antioxidant enzymes that resist to freezing, for survival at subzero temperatures. In the present study, we assessed the importance of glucose to cryoresistance of two anuran amphibians: the frog Rana catesbeiana and the toad Bufo paracnemis. Both animals were exposed to -2 degrees C for measurements of plasma glucose levels, liver and muscle glycogen content, haematocrit and red blood cell volume. Read More

View Article

Download full-text PDF

Source

[Larval competition in Chrysomya megacephala (F.) (Diptera: Calliphoridae): effects of different levels of larval aggregation on estimates of weight, fecundity and reproductive investment].

Rev Bras Biol 2000 May;60(2):195-203

Departamento de Zoologia, Universidade Estadual Paulista, Rio Claro, SP, Brasil.

In insects that utilize patchy and ephemeral resources for feeding and egg laying, the outcome of larval competition for food resources depends on the amount of resources and the spatial distribution of immatures among patches of food. In the present study, the results of larval competition for food in Chrysomya megacephala, in traits such as female weight, fecundity and reproductive investment, were different in situations where the level of larval aggregation (proportion of competitors per amount of food) was the same, but with densities of competitors and amounts of food proportionally different. These results are indicative that the larval competition may depend both on the larval density and the amount of food, in different situations with the same proportion of larvae per gram of food. Read More

View Article

Download full-text PDF

Source

Ontogenetic events in androgenesis of Brazilian barley genotypes.

Rev Bras Biol 2000 May;60(2):315-319

Embrapa Trigo, Passo Fundo, RS, 99001-970, Brazil.

This paper describes a simple procedure for obtention of barley (Hordeum vulgare L.) doubled haploid plants from Brazilian hybrid genotypes. Anatomical and histological examinations showed the reversion of barley pollen to an sporophytic mode of development. Read More

View Article

Download full-text PDF

Source

Morphometrics and adaptatives aspects in africanized honeybees (Apis mellifera).

Rev Bras Biol 2000 May;60(2):307-314

Instituto de Genética e Bioquímica, Universidade Federal de Uberlândia, Uberlândia, MG, 38400-902, Brazil.

The introduction of the African bees (Apis mellifera scutelata) in Brazil and their expansion in the American Continent created the opportunity to study the process of species adaptation in a new environment. In that process, within intra-specific variability, normalising selection can favour individuals that present a better adaptative morphology and they will constitute the most frequent type found in the population. To test that hypothesis morphometric analyses in samples of colonies of africanized bees and in samples of the populations were performed. Read More

View Article

Download full-text PDF

Source

Flight activity and colony strength in the stingless bee Melipona bicolor bicolor (Apidae, Meliponinae).

Rev Bras Biol 2000 May;60(2):299-306

Departamento de Zoologia, Instituto de Biociências, USP, São Paulo, SP, 05508-900, Brazil.

Flight activity of Melipona bicolor bicolor, coming from Cunha (23o05'S, 44o55'W), Atlantic Forest, was studied in ten colonies, and in two periods: from July to September 1993 and from August to September 1995. The colonies were grouped in weak, medium and strong, according to the diameter of the combs, which can provide a good idea of the number of cells built. 855 observations were accomplished for 5 minutes, every half-hour, from 8 to 18 hours. Read More

View Article

Download full-text PDF

Source

Entomological fauna from Reserva Biológica do Atol das Rocas, RN, Brazil: I. Morphospecies composition.

Rev Bras Biol 2000 May;60(2):291-298

Departamento de Museologia, Centro Universitário de Barra Mansa, Barra Mansa, RJ, 27330-550, Brazil.

Atol das Rocas, the unique atoll in the South-western Atlantic, is located 144 nautical miles (266 Km) northeast from the city of Natal, NE Brazil and 80 nautical miles from Arquipélago de Fernando de Noronha, with geographic co-ordinates 3 masculine51'S and 33 masculine49"W. It's of volcanic origin and coralline formation. The reef is ellipsoid, its largest axis (E-W) is approximately 3. Read More

View Article

Download full-text PDF

Source

Relationship between dental morphology, sex, body length and age in Pontoporia blainvillei and Sotalia fluviatilis (Cetacea) in Northern Rio de Janeiro, Brazil.

Rev Bras Biol 2000 May;60(2):283-290

Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense, Campos, RJ, 28015-620, Brazil.

The relationship between dental morphology, sex, body length and age of small cetaceans can be used to determine ontogeny, sexual dimorphism and geographical variation. The objective of this study was to determine the relationship between dental morphology, sex, body size and age. A total of 91 specimens of P. Read More

View Article

Download full-text PDF

Source

Home range of a Geoffroy's marmoset group, Callithrix geoffroyi (Primates, Callitrichidae) in South-eastern Brazil.

Rev Bras Biol 2000 May;60(2):275-281

Departamento de Zoologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil.

The home range of one group of the Geoffroy's marmoset (Callithrix geoffroyi) was studied in a fragment of the Atlantic Forest in south-eastern Brazil, between February 1993 and January 1994. The total home range was 23.3 ha and the area used in the dry season was significantly larger than that of the wet season. Read More

View Article

Download full-text PDF

Source

Ventilatory structures in Cryphocricos barozzii Signoret (Heteroptera, Naucoroidea).

Rev Bras Biol 2000 May;60(2):267-273

Departamento de Entomología, Museo de La Plata, La Plata, Argentina.

Plastron and spiracular features strongly resemble those of Aphelocheirus aestivalis (Fab.), described by Messner et al. (1981). Read More

View Article

Download full-text PDF

Source

The reproductive strategy of Leporinus friderici (Characiformes, Anostomidae) in the Paraná River basin: the effect of reservoirs.

Rev Bras Biol 2000 May;60(2):255-266

Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura (NUPELIA), DBI, Universidade Estadual de Maringá.

The reproductive strategy of a species depends upon the interaction between intrinsic and extrinsic factors. Examining the population of Leporinus friderici in two reservoirs of the Upper Paraná River basin in reference to first gonadal maturation and breeding season and sites, the present investigation tested whether the environment formed by damming promoted spatial and temporal changes in the reproductive strategy of this species. Analyses of sex ratios showed that females significantly predominated in Itaipu, while in Corumbá the sexes were about equal with a slight predominance of males. Read More

View Article

Download full-text PDF

Source

Ventilatory flow relative to intrabuccal and intraopercular volumes in the serrasalmid fish Piaractus mesopotamicus during normoxia and exposed to graded hypoxia.

Rev Bras Biol 2000 May;60(2):249-254

Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, São Carlos, SP, 13565-905, Brazil.

Ventilation volume Vg - mlH2O.min-1 ), respiratory frequency (fR - breaths.min-1) and tidal volume (VT - mlH2O. Read More

View Article

Download full-text PDF

Source
May 2000
2 Reads

Conservation value of a native forest fragment in a region of extensive agriculture.

Authors:
Chiarello

Rev Bras Biol 2000 May;60(2):237-247

Museu de Biologia Prof. Mello Leitão, Santa Teresa, ES, 29650-000, Brazil.

A survey of mammals and birds was carried out in a semi-deciduous forest fragment of 150 ha located in a zone of intensive agriculture in Ribeirão Preto, State of São Paulo, south-eastern Brazil. Line transect sampling was used to census mammals and birds during six days, totalling 27.8 km of trails and 27. Read More

View Article

Download full-text PDF

Source

Uptake rates of nitrogen and phosphorus in the water by Eichhornia crassipes and Salvinia auriculata.

Rev Bras Biol 2000 May;60(2):229-236

Laboratório de Limnologia, Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-590, Brazil.

The main goal of this research was to survey information about the physiology of Eichhornia crassipes and Salvinia auriculata and their capacity to remove nitrogen and phosphorus from the environment, after quantifying the concentrations of the nitrogen (NO3-N, NH4-N and total-N) and phosphorus (PO4-P and total-P) compounds in the water. The macrophytes were incubated in the laboratory in plastic vials of approximately 1.5 litters containing a previously prepared solution of NH4NO3, NH4Cl and KH2PO4. Read More

View Article

Download full-text PDF

Source

Reproductive behavior and seasonal occurrence of Psecas viridipurpureus (Salticidae, Araneae).

Rev Bras Biol 2000 May;60(2):221-228

Departamento de Zoologia, Universidade Estadual Paulista, São José do Rio Preto, São Paulo, 15054-000, Brazil.

The reproductive behavior and the seasonal occurrence of Psecas viridipurpureus were studied at the Estação Ecológica do Noroeste Paulista, a small conservation area in the northwest region of São Paulo State, Brazil (49 degrees 22'50"W and 20 degrees 48'36"S). P. viridipurpureus occurred on "gravatá", a bromeliaceous plant (Bromelia balansae, Bromeliaceae) which does not accumulate rain water. Read More

View Article

Download full-text PDF

Source

Effect of the infestation by Lernaea cyprinacea Linnaeus, 1758 (Copepoda, Lernaeidae) on the leucocytes of Schizodon intermedius Garavello & Britski, 1990 (Osteichthyes, Anostomidae).

Rev Bras Biol 2000 May;60(2):217-220

Departamento de Biologia Animal e Vegetal, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Londrina, PR, 86051-990, Brazil.

Differential white blood cell counts from Schizodon intermedius infested by Lernaea cyprinacea were carried out and compared using the Wilcoxon matched pairs test. The observations were performed in fish infested by 16-77 adult Lernaea, fish with parasitic lesions but without attached crustaceans, and non parasitized fish (control group). The specimens of Schizodon intermedius were obtained from the University of Londrina fish farming facilities. Read More

View Article

Download full-text PDF

Source

Electrofishing as a sampling technique for coastal stream fish populations and communities in the Southeast of Brazil.

Rev Bras Biol 2000 May;60(2):205-216

Setor de Zoologia, DBAV, IB, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, 20559-900, Brazil.

Electrofishing adequacy was tested as a technique to obtain quantitative data of coastal stream fish populations and communities in the Southeast of Brazil. Seven field trips, between July/94 and July/95, were done in 5 localities of the Ubatiba fluvial system (Maricá, RJ). Seventeen species, among the 22 collected, had their numbers estimated through the Zipping method, the model used to test the sampling methodology. Read More

View Article

Download full-text PDF

Source

Spatial heterogeneity of the Tucuruí Reservoir (State of Pará, Amazonia, Brazil) and the distribution of zooplanktonic species.

Rev Bras Biol 2000 May;60(2):179-194

Departamento de Hidráulica e Saneamento, CRHEA, Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.

With the purpose of analyzing the horizontal distribution of the zooplankton community of the Tucuruí Reservoir in the State of Pará, Brazil, collections were made at 16 stations during August 1988. The stations cover the regions called Caraipé (C), Araçagi (B) and Ararão (A), and represent the different compartments of this ecosystem in regard to the morphometry and the presence or absence of "flooded forest". Our findings showed the existence of three compartments with different limnological characteristics determined as a function of the system's morphometry, a factor that may have influenced the horizontal circulation of the reservoir's water and, consequently, led to physical, chemical and biological differences at each of the sampled stations. Read More

View Article

Download full-text PDF

Source

Biology of Corecoris dentiventris Berg, 1884 (Hemiptera, Coreidae) in tobacco culture (Nicotiana tabacum).

Rev Bras Biol 2000 Feb;60(1):173-8

Departamento de Fitossanidade, Faculdade de Agronomia, UFRGS, Porto Alegre, RS, Brazil.

Corecoris dentiventris Berg, 1884 (HEM., Coreidae) represents a pest in the tobacco culture in Southern Brazil. Nymphs and adults cause the wilting and twisting of the tobacco leaves due to their sucking habit. Read More

View Article

Download full-text PDF

Source
February 2000

Histology of the trachea and lung of Siphonops annulatus (Amphibia, Gymnophiona).

Rev Bras Biol 2000 Feb;60(1):167-72

Departamento de Ciências Biológicas, Faculdade de Farmácia e Odontologia de Alfenas, MG, Brazil.

The structure of the trachea and lung of Siphonops annulatus was studied in ten specimens of routinely fed animals. The trachea is constituted mainly by incomplete cartilage rings lined by a respiratory epithelium (ciliated and mucous cells) with variable morphology according to the region observed. A rich vascularization of this organ suggests its participation in blood-air gas exchange. Read More

View Article

Download full-text PDF

Source
February 2000

Patterns of gall-forming in Ossaea confertiflora (Melastomataceae) by Lopesia brasiliensis (Diptera: Cecidomyiidae) in an area of Atlantic Rainforest in southeastern Brazil.

Rev Bras Biol 2000 Feb;60(1):159-66

Setor de Ecologia, Universidade do Estado do Rio de Janeiro, Brazil.

Patterns of galling by the gall midge Lopesia brasiliensis (Diptera: Cecidomyiidae) were studied in Ossaea confertiflora (Melastomataceae) in an Atlantic forest site at Ilha Grande, RJ. Out of the 81 plants surveyed, 55 (67.9%) bore galls. Read More

View Article

Download full-text PDF

Source
February 2000

[Variation of above-ground biomass of Allagoptera arenaria (Gomes) O. Kintze (Arecaceae) at a palm shrub community on the Marambaia beach ridge, Rio de Janeiro, Brazil].

Rev Bras Biol 2000 Feb;60(1):147-57

Departamento de Botânica, Universidade Federal Rural do Rio de Janeiro, Seropédica.

Variation of above-ground biomass of Allagoptera arenaria (Gomes) O. Kuntze (Arecaceae) along five topographic profiles perpendicular to the ocean was examined in a palm scrub community on Marambaia beach ridge, Rio de Janeiro State, Brazil. Aerial biomass was positively correlated with distance from the sea (F = 39. Read More

View Article

Download full-text PDF

Source
February 2000

Reproductive phenological patterns of cerrado plant species at the Pé-de-Gigante Reserve (Santa Rita do Passa Quatro, SP, Brazil): a comparison between the herbaceous and woody floras.

Rev Bras Biol 2000 Feb;60(1):129-45

Instituto de Biociências, Universidade de São Paulo, Brazil.

A natural vegetation area, with 1269 ha, composed mainly by cerrado, located at Santa Rita do Passa Quatro Municipality, São Paulo State, southeastern Brazil (21 degrees 36-39'S, 47 degrees 36-38'W), was studied. From September 1995 to February 1997, a floristic survey was carried out, when all vascular plant species at reproductive stage were collected. The flowering and fruiting patterns of the community were studied, comparing the herbaceous and the woody species. Read More

View Article

Download full-text PDF

Source
February 2000

Antennal malformations in light ocelli drones of Apis mellifera (Hymenoptera, Apidae).

Authors:
J Chaud-Netto

Rev Bras Biol 2000 Feb;60(1):123-7

Departamento de Biologia, IBRC, Universidade Estadual Paulista, SP, Brazil.

Malformed antennae of Apis mellifera light ocelli drones were drawn, dissected and mounted permanently on slides containing Canada balsam, in order to count the olfactory discs present in each segment, in comparison with the number of those structures in normal antennae of their brothers. Some drones presented morphological abnormalities in a single segment of the right or left antenna, but others had two or more malformed segments in a same antenna. Drones with malformations in both antennae were also observed. Read More

View Article

Download full-text PDF

Source
February 2000

Growth of Nile tilapia Oreochromis niloticus fed with different levels of alcohol yeast.

Rev Bras Biol 2000 Feb;60(1):113-21

Departamento de Matemática Aplicada, Universidade Estadual de Londrina, PR, Brazil.

Two hundred and forty 45-day-old fingerlings of Nile tilapia (Oreochromis niloticus), sexually reverted with an initial average weight of 1.25 +/- 0.14 g, distributed in a totally casualized delineation, during 330 days. Read More

View Article

Download full-text PDF

Source
February 2000

Comparative study of the zooplankton composition of six lacustrine ecosystems in central Brazil during the dry season.

Authors:
F L Starling

Rev Bras Biol 2000 Feb;60(1):101-11

Companhia de Agua e Esgotos de Brasília, CAESB & Universidade Católica de Brasília, UCB, DF, Brazil.

Zooplankton community from six lacustrine ecosystems located in Federal District (Central Brazil) was studied based on samples collected during the dry season (July to September). A total of 71 taxa were recorded: 44 rotifers, 17 cladocerans and 10 copepods. The highest number of zooplankton species was recorded in oligotrophic Bonita Pond (32 species) and the lowest number in hypertrophic waste stabilisation ponds (7 species). Read More

View Article

Download full-text PDF

Source
February 2000

Dental development and ontogenetic diet shifts of Roeboides paranensis pignalberi (osteichthyes, Characinae) in pools of the upper Rio Paraná floodplain (state of Paraná, Brazil).

Rev Bras Biol 2000 Feb;60(1):93-9

Nupélia (Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura), Universidade Estadual de Maringá, Paraná, Brazil.

Species of the characid genus Roeboides are known for their habit of tearing off and ingesting scales from other fishes. Specimens of Roeboides paranensis were taken monthly from March 1992 through February 1993 in five pools of the upper Rio Paraná floodplain and in one site in the Rio Paraná itself, with the aim of relating the dental development to ontogenetic diet shifts. Between 15-22 mm SL, fish had teeth with hypertrophied bases (mammiform) that moved to the outside of the mouth in both maxillas. Read More

View Article

Download full-text PDF

Source
February 2000

Population dynamics and net primary production of the aquatic macrophyte Nymphaea rudgeana C. F. Mey in a lotic environment of the Itanhaém River basin (SP, Brazil).

Rev Bras Biol 2000 Feb;60(1):83-92

Departamento de Ecologia/Caunesp, UNESP, Rio Claro, SP, Brazil.

In this paper we evaluated the population dynamics and obtained estimates of the net primary production of the aquatic macrophyte Nymphaea rudgeana in an arm of the Itanhaém River (São Paulo State, Brazil). This species presents, in the studied area, a broad seasonal variation of biomass. As from November (13. Read More

View Article

Download full-text PDF

Source
February 2000