Temporal distribution in the abundance of the fiddler crab Uca (Leptuca) uruguayensis Nobili, 1901 (Decapoda: Ocypodidae) from Garças River mangrove, Guaratuba Bay, southern Brazil

Adult females of most black flies species (Diptera, Simuliidae) exhibit a blood-sucking habit. Immature stages develop in water courses and are important in the ecology of lotic environments. We aim to understand the distribution of immature simuliids in the hydrographic sub-basin of the Comandaí river, in Northwest of Rio Grande do Sul, Brazil. For that purpose, simuliids were sampled in three stretches (source, intermediate and mouth) of nine streams, distributed along the three main regions of the sub-basin. Evaluations of the influence of abiotic factors in different spatial and temporal scales were made. Sampling was carried out in two seasons: between September and November 2016 (spring), and between April and July 2017 (autumn). In total, 17,146 individuals were sampled (larvae of last instars and pupae), which resulted in the identification of eleven Simuliidae species. The most abundant species were Simulium pertinax Kollar (77.55%), followed by Simulium incrustatum Lutz (14.56%) and Simulium subpallidum Lutz (2.35%). Regarding the identification of indicator species, S. pertinax, Simulium jujuyense Paterson & Shannon, S. subpallidum and Simulium orbitale Lutz stood out in mouth stretches, and Simulium rubrithorax Lutz in source stretches. Environmental variables such as conductivity, altitude, canopy cover and stream width were interpreted as important conditioning factors for the distribution of simuliid immature stages. In general, we concluded that Simuliidae are more abundant during spring in the study area, mainly downstream. This information may contribute to the implementation of efficient measures to control species of health importance in southern Brazil.

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Spatial and temporal distribution of Pseudis minuta (Anura, Hylidae, Hylinae) and environmental variables related to its reproductive activity in Reserva Biológica do Lami, southern Brazil

Iheringia Série Zoologia ◽

10.1590/s0073-47212010000200010 ◽

2010 ◽

Vol 100 (2) ◽

pp. 145-150 ◽

Cited By ~ 5

Author(s):

Caroline Zank ◽

Marcos Di-Bernardo ◽

Raúl Maneyro ◽

Patrick Colombo ◽

Luciana A. Fusinatto ◽

...

Keyword(s):

Environmental Variables ◽

Abiotic Factors ◽

Temporal Distribution ◽

Reproductive Activity ◽

Spatial And Temporal Distribution ◽

Southern Brazil ◽

Porto Alegre ◽

Abiotic Variables ◽

Temperature Water ◽

Pseudis Minuta

We studied the reproductive biology of a population of Pseudis minuta Günther, 1858 from Reserva Biológica do Lami (30º 15' S; 51º 05' W), Porto Alegre, southern Brazil. We assessed the spatial and temporal distribution of individuals (males, females, juveniles) and explored potential relationships with environmental variables. Field activities encompassed bimonthly surveys in three semi-permanent ponds, each one during approximately two days and two nights, from August 2004 to July 2005. We recorded differences in the sites used by males, females and juveniles, with males occupying deeper and more distant places from the border. The temporal distributions of individuals, calling sites and amplectant pairs indicated that the reproductive activity of P. minuta is related to some of the studied abiotic factors. Calling males presented statistical differences in relation to non-calling males for all daily abiotic variables analyzed (air temperature, water temperature, relative humidity and rainfall), as well as to monthly temperature and rainfall. The number of active males, females and juveniles was influenced by at least one of the daily or monthly environmental variables analyzed. We conclude that the reproduction in this species is seasonal and may be partially determined by abiotic factors.

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Seasonality of macroalgal communities in a subtropical drainage basin in Paraná state, southern Brazil

Brazilian Journal of Biology ◽

10.1590/s1519-69842008000400008 ◽

2008 ◽

Vol 68 (4) ◽

pp. 741-749 ◽

Cited By ~ 5

Author(s):

CCZ. Branco ◽

RA. Krupek ◽

CK. Peres

Keyword(s):

Drainage Basin ◽

Seasonal Pattern ◽

Linear Regression Analysis ◽

Sampling Site ◽

Temporal Distribution ◽

Detrended Correspondence Analysis ◽

Floristic Composition ◽

Distribution Patterns ◽

Multiple Linear Regression Analysis ◽

Southern Brazil

Seasonal dynamics of macroalgal communities was analyzed monthly by samplings in three stream segments of the Pedras River Basin, mid-south region of Paraná State, southern Brazil, from April 2004 to March 2005. The seasonal fluctuations in macroalgal species richness and abundance were correlated with selected environmental variables. In general, the seasonal distribution patterns of these communities were distinct from those reported from other tropical and temperate regions, with higher macroalgal richness and abundance observed from late spring to late fall. Multiple linear regression analysis revealed that the stream variable most closely related with the temporal distribution pattern observed was temperature, which had a very similar seasonal pattern to the biological parameters. On the other hand, the floristic composition was quite diverse in the streams sampled. Among the 25 taxa identified, only two were common to the three streams whereas 15 were restricted to a single sampling site. These data indicate that, although temperature seems to be an effective relationship with global temporal pattern, particular characteristics of each stream can strongly influence the seasonal tendencies in local scale. The results of Detrended Correspondence Analysis (DCA) and Cluster Analysis corroborated this observation.

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Larval export strategy as an indication of ontogenetic migrations towards open sea of the fiddler crab Leptuca leptodactyla (Rathbun, in Rankin, 1898) (Crustacea, Ocypodidae) from Guaratuba Bay, southern Brazil

Nauplius ◽

10.1590/2358-2936e2020028 ◽

2020 ◽

Vol 28 ◽

Author(s):

Salise Brandt Martins ◽

Ubiratan de Assis Teixeira da Silva ◽

Setuko Masunari

Keyword(s):

Fiddler Crab ◽

Southern Brazil ◽

Export Strategy ◽

Open Sea

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Combining serological assays and official statistics to describe the trajectory of the COVID-19 pandemic: results from the EPICOVID19-RS study in Rio Grande do Sul (Southern Brazil)

10.1101/2021.05.21.21257634 ◽

2021 ◽

Author(s):

Fernando Pires Hartwig ◽

Lu&iacutes Paulo Vidaletti ◽

Alu&iacutesio JD Barros ◽

Gabriel D Victora ◽

Ana MB Menezes ◽

...

Keyword(s):

Point Of Care ◽

Temporal Distribution ◽

Rapid Test ◽

Rio Grande ◽

Enzyme Linked Immunosorbent Assay ◽

Infection Prevalence ◽

Southern Brazil ◽

Rio Grande Do Sul ◽

Official Statistics ◽

Over Time

Background: The EPICOVID19-RS study conducted 10 population-based surveys in Rio Grande do Sul (Southern Brazil), starting early in the epidemic. The sensitivity of the rapid point-of-care test used in the first eight surveys has been shown to decrease over time after some phases of the study were concluded. The 9th survey used both the rapid test and an enzyme-linked immunosorbent assay (ELISA) test, which has a higher and stable sensitivity. Methods: We provide a theoretical justification for a correction procedure of the rapid test estimates, assess its performance in a simulated dataset and apply it to empirical data from the EPICOVID19-RS study. COVID-19 deaths from official statistics were used as an indicator of the temporal distribution of the epidemic, under the assumption that fatality is constant over time. Both the indicator and results from the 9th survey were used to calibrate the temporal decay function of the rapid test's sensitivity from a previous validation study, which was used to estimate the true sensitivity in each survey and adjust the rapid test estimates accordingly. Results: Simulations corroborated the procedure is valid. Corrected seroprevalence estimates were substantially larger than uncorrected estimates, which were substantially smaller than respective estimates from confirmed cases and therefore clearly underestimate the true infection prevalence. Conclusion: Correcting biased estimates requires a combination of data and modelling assumptions. This work illustrates the practical utility of analytical procedures, but also the critical need for good quality, populationally-representative data for tracking the progress of the epidemic and substantiate both projection models and policy making.

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Relative growth in the fiddler crab Uca uruguayensis Nobili, 1901 (Brachyura, Ocypodidae) from Garças River mangrove, Guaratuba Bay, southern Brazil

Nauplius ◽

10.1590/s0104-64972013000100005 ◽

2013 ◽

Vol 21 (1) ◽

pp. 35-41 ◽

Cited By ~ 6

Author(s):

Salise Brandt Martins ◽

Setuko Masunari

Keyword(s):

Fiddler Crab ◽

Southern Brazil ◽

Relative Growth ◽

Uca Uruguayensis

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Spatio-temporal distribution and target species of longline fisheries off Southeastern/Southern Brazil between 2000 and 2011

Brazilian Journal of Oceanography ◽

10.1590/s1679-87592015090706304 ◽

2015 ◽

Vol 63 (4) ◽

pp. 407-422 ◽

Cited By ~ 3

Author(s):

Fernando N. Fiedler ◽

Gilberto Sales ◽

Bruno B. Giffoni ◽

Dagoberto Port ◽

Rodrigo Sant'Ana ◽

...

Keyword(s):

Technological Development ◽

Temporal Distribution ◽

Data Sets ◽

Market Demand ◽

Southern Brazil ◽

Target Species ◽

Blue Shark ◽

Spatio Temporal ◽

Longline Fisheries ◽

Pelagic Longline

Abstract In the presente study, cluster analysis was performed to classify 1080 interviews with captains of national pelagic longline fleet (2000 to 2011), and 38 trips of the chartered fleet (2003 to 2008), in relation to the composition of species landed. For the national fleet 4 groups were identified: 1 - Albacores, 2 - Blue shark, 3 - Swordfish, and 4 - Dolphinfish. For the chartered fleet 3 groups were identified: 1 - Swordfish, 2 - Blue shark, and 3 - Albacores. The results indicated that part of the national fleet change their strategies according to the availability of the target species and market demand (internal and external). A part of the fleet from Espírito Santo state operates in the region between December and March, exclusively to capture dolphinfish. The chartered fleet differed from the national one as regards the fishing areas of each target species, mainly as regards swordfish and blue shark. Despite the great difference in the data sets, it is evident that both the national and the chartered fleets operated in accordance with their peculiarities and technological development, adopting strategies that optimize catches and net profits per trip.

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Weather Reasearch and Forecasting Model Simulation of a Snowfall Event in Southern Brazil

Revista Brasileira de Geografia Física ◽

10.26848/rbgf.v14.2.p1194-1205 ◽

2021 ◽

Vol 14 (2) ◽

pp. 1194

Author(s):

Ricardo Antonio Mollmann Junior ◽

Rita de Cássia Marquês Alves ◽

Gabriel Bonow Münchow ◽

Osvaldo Luiz Leal de Moraes ◽

Caroline Azzolini Pontel

Keyword(s):

Land Surface ◽

Model Simulation ◽

Land Surface Model ◽

Temporal Distribution ◽

Surface Model ◽

Southern Brazil ◽

Single Moment ◽

Model Scheme ◽

Snowfall Event ◽

South Of Brazil

This study evaluates the reliability of the Weather Research and Forecasting (WRF) to simulate a snowfall event in the south of Brazil. The event in August 2013 was considered one of the most intense in recent years in the region with the highest topographic elevations between the states of Rio Grande do Sul (RS) and Santa Catarina (SC). The Snowfall in the mountain region of RS and SC was associated with the configuration involving a polar anticyclone and the intensification of an extratropical cyclone over the Atlantic Ocean. The WRF simulation results demonstrated the model's viability to predict the event, but without the magnitude representation of the phenomenon. The WRF simulation underestimated the results for the accumulated and area of the snowfall region, which may be linked to overestimations of surface and vertical air temperature and liquid water precipitation. These results were attributed to the choice of WRF Single–moment 6–class (WSM6) microphysics and in the Noah Land Surface Model scheme. Despite these limitations, WRF has proved to be an important tool for predicting the spatial and temporal distribution of snowfall and precipitation in the higher regions of southern Brazil.

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