23 research outputs found
Biogeography and effects of forest fragmentation on birds of the Upper Paraná River Floodplain region, between Mato Grosso do Sul and Paraná States, Brazil.
No full textThis study analyzed the forest birds distribution and sensitivity to forest fragmentation in the Upper Paraná River Floodplain (PAAP) region by comparing the avifauna of the two margins (Mato Grosso do Sul; MS and Paraná; PR) of the Paraná River. The landscapes of two margins are distinct because PAAP is located near the boundaries of both Central South America (CSA) and Atlantic Forest (ATL) biogeographic zone, with each margin being represented by one zone and due to the presence of a floodplain only at the MS margin. The communities were similar in structural parameters, but there were low qualitative and quantitative similarities between the margins, possibly due to the influence of the biogeographic zones; several species related either to CSA or ATL zones occurred exclusively, or were more abundant, at the margin were they were expected to occur. The avifaunal sensitivity to forest fragmentation varied between the margins, with greater proportion of bird species not sensitive at the MS margin. In addition, the degree of sensitivity of 30% of the species recorded at the two margins and the sensitivity of some functional groups with characteristics less affected negatively by fragmentation vary between the margins. The sensitivity of the species related to either the CSA or ATL zone was distinct, once that none of the species related to the CSA zone at MS margin were considered sensitive, while species related to the ATL zone had greater proportion of sensitive species at both margins. Overall, this study suggests a transition between the CSA and ATL avifauna in the PAAP region and recommends that conservation strategies should consider such regional feature since the sensitivity of functional groups or species can vary between landscapes.Este estudo analisou a distribuição da avifauna florestal e a sua sensibilidade à fragmentação florestal na região da Planície Alagável do Alto Rio Paraná (PAAP), comparando a avifauna das duas margens (Mato Grosso do Sul; MS e Paraná; PR) do rio Paraná. As paisagens das duas margens são diferentes em função da proximidade com o limite de distribuição das zonas biogeográficas Centro Sul Americana (CSA) e Atlântica (ATL), cada qual mais representativa em uma das margens, e pela presença da planície alagável apenas na margem MS. As comunidades foram semelhantes quanto a parâmetros estruturais, mas houve baixa similaridade qualitativa e quantitativa entre as margens, aparentemente por influência das afinidades biogeográficas; várias espécies associadas apenas à zona CSA ou ATL ocorreram somente, ou foram mais abundantes, na margem em que seriam esperadas. Houve maior proporção de espécies não sensíveis na margem MS, quando comparada à margem PR. Além disso, o grau de sensibilidade de 30% das espécies que ocorreram nas duas margens e a de grupos funcionais com características menos afetadas negativamente pela fragmentação, variou entre as margens. A sensibilidade das espécies associadas à zona CSA ou ATL mostrou-se distinta, uma vez que 100% das espécies associadas à zona CSA na margem MS foram não sensíveis enquanto as espécies associadas à zona ATL tiveram maior proporção de espécies sensíveis nas duas margens. No geral, o estudo sugeriu uma transição entre a avifauna das zonas CSA e ATL na região da PAAP e recomenda que estratégias de conservação de aves florestais não deveriam ser generalizadas uma vez que a sensibilidade de grupos funcionais ou de cada espécie pode variar entre paisagens.Ph
Regulatory reform in the brazilian railway sector and concession valuation: a preliminary assessment
No full textTrabalho apresentado na 4th Conference on the Regulation of InfrastructuresEscola de Direito do Rio de Janeiro da Fundação Getulio Varga
Biogeography and effects of forest fragmentation on birds of the Upper Paraná River Floodplain region, between Mato Grosso do Sul and Paraná States, Brazil.
No full textThis study analyzed the forest birds distribution and sensitivity to forest fragmentation in the Upper Paraná River Floodplain (PAAP) region by comparing the avifauna of the two margins (Mato Grosso do Sul; MS and Paraná; PR) of the Paraná River. The landscapes of two margins are distinct because PAAP is located near the boundaries of both Central South America (CSA) and Atlantic Forest (ATL) biogeographic zone, with each margin being represented by one zone and due to the presence of a floodplain only at the MS margin. The communities were similar in structural parameters, but there were low qualitative and quantitative similarities between the margins, possibly due to the influence of the biogeographic zones; several species related either to CSA or ATL zones occurred exclusively, or were more abundant, at the margin were they were expected to occur. The avifaunal sensitivity to forest fragmentation varied between the margins, with greater proportion of bird species not sensitive at the MS margin. In addition, the degree of sensitivity of 30% of the species recorded at the two margins and the sensitivity of some functional groups with characteristics less affected negatively by fragmentation vary between the margins. The sensitivity of the species related to either the CSA or ATL zone was distinct, once that none of the species related to the CSA zone at MS margin were considered sensitive, while species related to the ATL zone had greater proportion of sensitive species at both margins. Overall, this study suggests a transition between the CSA and ATL avifauna in the PAAP region and recommends that conservation strategies should consider such regional feature since the sensitivity of functional groups or species can vary between landscapes.Este estudo analisou a distribuição da avifauna florestal e a sua sensibilidade à fragmentação florestal na região da Planície Alagável do Alto Rio Paraná (PAAP), comparando a avifauna das duas margens (Mato Grosso do Sul; MS e Paraná; PR) do rio Paraná. As paisagens das duas margens são diferentes em função da proximidade com o limite de distribuição das zonas biogeográficas Centro Sul Americana (CSA) e Atlântica (ATL), cada qual mais representativa em uma das margens, e pela presença da planície alagável apenas na margem MS. As comunidades foram semelhantes quanto a parâmetros estruturais, mas houve baixa similaridade qualitativa e quantitativa entre as margens, aparentemente por influência das afinidades biogeográficas; várias espécies associadas apenas à zona CSA ou ATL ocorreram somente, ou foram mais abundantes, na margem em que seriam esperadas. Houve maior proporção de espécies não sensíveis na margem MS, quando comparada à margem PR. Além disso, o grau de sensibilidade de 30% das espécies que ocorreram nas duas margens e a de grupos funcionais com características menos afetadas negativamente pela fragmentação, variou entre as margens. A sensibilidade das espécies associadas à zona CSA ou ATL mostrou-se distinta, uma vez que 100% das espécies associadas à zona CSA na margem MS foram não sensíveis enquanto as espécies associadas à zona ATL tiveram maior proporção de espécies sensíveis nas duas margens. No geral, o estudo sugeriu uma transição entre a avifauna das zonas CSA e ATL na região da PAAP e recomenda que estratégias de conservação de aves florestais não deveriam ser generalizadas uma vez que a sensibilidade de grupos funcionais ou de cada espécie pode variar entre paisagens.83
Regulatory reform in the brazilian railway sector: a preliminary assesment
No full textEscola de Direito do Rio de Janeiro da Fundação Getulio Varga
Reação em mercado secundário de Fundos de Investimento Imobiliário após anúncios de resultados
No full textEste trabalho examina a reação em mercado secundário dos preços e do volume de transação de Fundos de Investimento Imobiliário (FII) brasileiros após anúncios de resultados. Para isso, utiliza a metodologia de estudo de eventos para estimar o turnover anormal acumulado e o retorno anormal acumulado durante a janela de divulgação. Utiliza também o conceito de Funds From Operations (FFO) para calcular a performance operacional dos FIIs. Os dados das divulgações de resultado foram obtidos através de sistema que realiza a coleta diária em diferentes fontes públicas de informação. Os resultados sugerem que há evidências de violação da hipótese de mercado eficiente na forma semi-forte para os retornos dos fundos da amostra durante o período estudado.This study examines the reaction of Brazilian REIT prices and trading volume to earnings announcements. Using the event study method, we estimate the cumulative abnormal turnover and the cumulative abnormal return during the event window. In addition, the definition of Funds From Operations (FFO) is used to measure the REITs’ operational performance. Earnings announcement data were obtained using a system that collects information every day from different public sources. The results suggest that there is evidence of violation of semi-strong form efficiency of Efficient Market Hypothesis Theory for the sample and during the period studied
Effects of Fragmentation on the Bird Guilds of the Atlantic Forest in North Parana, Southern Brazil
No full textFigure 2 from: Ferreira GS, Almeida dos Santos DA, Lopes EV (2019) Richness, abundance and microhabitat use by Ardeidae (Aves: Pelecaniformes) during one seasonal cycle in the floodplain lakesof the lower Amazon River. Zoologia 36: 1-10. https://doi.org/10.3897/zoologia.36.e30475
No full textFigure 2 Sampling design for macrofauna collection in the intertidal zone. Each station included three pooled samplings per strata (upper, middle and lower) of the intertidal zone as sampling unit
Cuadernos de Herpetología | Volumen 38 | Número 1
No full textTrabajos
- Lista de ectoparásitos (ácaros y garrapatas) infestando reptiles y anfibios de Argentina | Gabriel N. Castillo
- Sexual size dimorphism in selected traits of leptodactylus luctator (Anura: Leptodactylidae) | Jerónimo Salguero, Fernando Carezzano, Javier Goldberg
- Anfibios de la Reserva Natural Provincial Rincón de Santa María (Corrientes Argentina) y especies prioritarias para su conservación | Olga E. Villalba, Nestor Fariña, Lisandro Cardinale, Alejandro R. Giraudo
Notas
- Predation attempt events on Crotopbaga major (Aves: Cuculidae) and Tbraupispalmarum (Aves: Thraupidae) by Oxybelis fulgidas (Squamata: Colubridae) in the brazilian Amazon | Gustavo Henrique dos Anjos Rodrigues, Ivan Alves dos Santos-Jr., Lucas José Clemente Figueira, Mayse da Silva Malcher, Dilson de Siqueira Pinto-Júnior, Edson Varga Lopes, Darlison Chagas-de-Souza, Tássio Alves Coelho
- Predation events involving herpetofauna in the Caatinga region, Brazil | Darlison Chagas-de-Souza, Ivan Alves dos Santos-Jr., Gustavo Henrique dos Anjos Rodrigues, Lucas José Ciemente Figueira, Bruna Thais da Cruz Santos, Rafael Avila Grisostenes, Tássio Alves Coelho
- Insights on the reproductive biology of Oxyrhopus petolarius (Linnaeus, 1758) (Dipsadidae: Pseudoboini) from Southeastern Brazil | Lucas Rosado Mendonça, Marcelo Augusto Pereira Coelho Dias, Déborah Fantuzzi Lucas, Caio Victor da Paz e Figueiredo, Sérgio Luis Pinto da Matta, Renato Neves Feio
- Amplexo interespecífico entre Kbinelh bonibilis e Incilius coniferas (Anura: Bufonidae) en la República de Panamá | Valery Ramírez-Morán, Janick Hernández-Sánches, Nelson Guevara-Alvarado
- Corrección de la localidad tipo de Uolaemus rosenmanni Núñez y Navarro, 1992 (Squamata: Liolaemidae) y esclarecimiento de su real distribución geográfica en el norte de Chile | Pablo A. González-Gutiérrez
Novedades zoogeográficas
- Polycbras gutturosus (Squamata: Polychrotidae): First record in Olancho, Honduras | Cristopher A. Antúnez-Fonseca, Marcio Martínez, Jorge F. Vásquez-Romero, Alejandro J. Salguero-Sánchez, Irene Sánchez
- First record of the rare snake Chlorosoma laticeps (Werner, 1900) in the State of Rio de Janeiro, Brazil | Carlos Henrique de-Oliveira-Nogueira, Diego Moura da Silva, Gaspar José Gomes Neto, Thaynara Mendes MachadoAsociación Herpetológica Argentin
Richness, abundance and microhabitat use by Ardeidae (Aves: Pelecaniformes) during one seasonal cycle in the floodplain lakesof the lower Amazon River
No full textThe Amazon floodplains become periodically submerged as result of seasonal changes in the water levels throughout the year. These changes influence the availability of microhabitats and consequently the abundance of organisms in these ecosystems. In this study we investigated 1) how changes in the water level affect the richness and abundance of ardeid birds in the lowland floodplain lakes of the lower Amazon River, and 2) the microhabitats used by these birds throughout the seasonal cycle. Ten lakes were surveyed at each of the four phases of the seasonal cycle. In total, 3,280 individuals of 11 species were recorded. Of these, eight species occurred in the four phases, and three were observed in one or two phases. In the analysis including the entire family, there were more individuals in the phase with waters at lowest level and less in the phase that the water level was lowering. Many species were present throughout the seasonal cycle, suggesting that they might be resident species. However, their abundance varied throughut the cycle, suggesting that parts of their populations temporarily migrate elsewhere. The microhabitat that was most commonly used by most species at all phases of the seasonal cycle, with the excetions noted below, was "aquatic macrophytes", suggesting that ardeid birds have a strong preperence for this kind of habitat. Three species – Egretta caerulea (Linnaeus, 1758), Nycticorax nycticorax (Linnaeus, 1758) and Bubulcus ibis (Linnaeus, 1758) – preferred other microhabitats at some phase of their seasonal cycle. The present study shows that the floodplain lakes of the lower Amazon River are richer in ardeid bird species than other areas of the Amazon biome and other biomes in Brazil. The fact that we found rare species in our study and that they depend on aquatic macrophytes demonstrates the importance of conserving the floodplain lakes of the lower Amazon River
Efectos de la conectividad sobre comunidades de aves forestales de paisajes fragmentados adyacentes
No full textWe assessed bird sensitivity to forest fragmentation in two adjacent landscapes in the Atlantic Forest of southern Brazil. One landscape is naturally fragmented and has high connectivity, whereas the other is human-fragmented and has low connectivity. We tested whether the sensitivity of bird species to fragmentation depends more on the intrinsic characteristics of the birds than on landscape connectivity. Point counts were used to sample small and large forest remnants in each landscape. The abundance of each species in these remnants was used as a proxy for sensitivity. To test whether the two landscapes differ in connectivity, we compared the following landscape metrics: landscape shape index (LSI), proximity index (PROX) and connectance index (CONNECT). We analysed the sensitivity of 85 species, 51 of which occurred exclusively in one of the two landscapes. In the landscape with low connectivity we recorded a large number of sensitive species. Among the 34 species that occurred in both landscapes, 24 species (18 non-sensitive and six sensitive) had the same sensitivity. Landscape connectivity seems to be more significant when we focus on the bird communities as a whole. However, when we focus on the same bird species in different landscapes, intrinsic characteristics of species seem to affect their sensitivity to fragmentation more than does landscape connectivity, especially for bird species with lower sensitivity. Therefore, our results show that increasing landscape connectivity may not be the best tool for bird conservation in naturally fragmented landscapes. Nevertheless, it will be important to test further whether forest bird species are more sensitive to environmental degradation in naturally fragmented landscapes than in human-fragmented landscapes.En el presente estudio analizamos la sensibilidad de las aves a la fragmentación del bosque en dos paisajes contiguos de la Mata Atlántica del sur de Brasil. Uno de los paisajes está fragmentado de manera natural y presenta alta conectividad, mientras que en el otro la fragmentación es de origen antrópico y tiene baja conectividad. Evaluamos si la sensibilidad de las especies a la fragmentación depende más de sus características intrínsecas que de la conectividad del paisaje. Usamos puntos de conteo para estimar la abundancia de aves en fragmentos grandes y pequeños en cada paisaje, como un indicador de su sensibilidad a la fragmentación. Para testar si los dos paisajes difieren en conectividad calculamos las siguientes métricas del paisaje: índice de forma del paisaje (LSE), índice de proximidad (PROX) e índice de conectividad (CONNECT). Evaluamos la sensibilidad de 85 especies, de las cuales 51 ocurrieron solamente en uno de los dos paisajes. En el paisaje con baja conectividad registramos un mayor número de especies sensibles. Entre las 34 especies detectadas en los dos paisajes, 24 (18 no sensibles y 6 sensibles) mostraron la misma sensibilidad. Cuando consideramos la comunidad de aves en su conjunto la conectividad del paisaje resulta más relevante, sin embargo, al analizar la misma especie en diferentes paisajes, las características intrínsecas de la especie parecen afectar más su sensibilidad a la fragmentación que la conectividad del paisaje, especialmente en el caso de aves con baja sensibilidad. Nuestros resultados muestran que aumentar la conectividad del paisaje puede no ser la mejor herramienta para la conservación de las aves en paisajes fragmentados de manera natural. No obstante, sería importante estudiar si las aves forestales son más sensibles a la degradación ambiental en paisajes fragmentados naturalmente que en los fragmentados por la actividad humana.The CNPq (Brazilian Research Council) gave us financial support through the Mata Atlântica Program. E. V. Lopes received a PhD scholarship from CNPq during the present study and a sandwich scholarship for a four-month research stay at the Universidad de Alicante in Spain (processes 140353/2006-2 and 202232/2007-7, respectively). L. B. Mendonça received a PhD scholarship from CNPq (process 140317/2006-6). L. dos Anjos received a CNPq research productivity fellowship level 1D (process 305593-2007-2)
