Espécies frugívoras são importantes pois são potenciais dispersores de sementes. O presente trabalho identifica as aves que se alimentam dos frutos de Cecropia pachystachya e quais as estratégias de captura de frutos apresentado por elas durante as visitas, indicando assim qual poderá atuar no processo de dispersão das sementes. As coletas de dados foram realizadas em dias não consecutivos entre os meses de março a junho de 2009, em uma área urbana em Luz, MG. Foram observadas 14 espécies de aves de seis famílias, consumindo parte dos frutos de C. pachystachya. Forpus xanthopterygius foi responsável por 76% das investidas ao fruto, porém essa espécie apresentou um comportamento predatório sendo a única a não contribuir efetivamente no processo de dispersão. Os potenciais dispersores de C. pachystachya foram os representantes da família Thraupidae. As estratégias de captura mais utilizadas pelas aves foram colher, alcançar e pendurar. O comportamento de obtenção do fruto através de voo ininterrupto foi realizado por apenas duas espécies Pitangus sulphuratus e Myiarchus ferox, e o comportamendo de voar pairando antes de obter o fruto não foi apresentado por nenhuma ave.
Este trabalho tem por objetivo analisar os aspectos socioeconômicos e ambientais da população das comunidades rurais da Chapada do Apodi/RN. Para isso, identificou-se com entrevistas o perfil socioeconômico e ambiental da população e, determinou-se com matriz de interação os conflitos existentes na área de estudo. Contatou-se que a maioria da população tem ensino fundamental incompleto, desenvolve atividades de agricultura, pecuária e produção de mel, que proporcionam renda familiar de até um salário mínimo. Evidenciou-se conflitos socioeconômicos e ambientais entre agronegócio e a agricultura familiar. Portanto, para atenuar a problemática investigada faz se necessário desenvolver diretrizes de Gestão Ambiental.
Os estudos morfométricos auxiliam no planejamento e gerenciamento de microbacias hidrográficas, determinando os parâmetros fisiográficos, de relevo e drenagem para avaliar o comportamento hidrológico da bacia. O presente estudo teve por objetivo caracterizar a morfometria da microbacia hidrográfica do Açude Grande de Caraúbas/RN. Foram utilizados para a delimitação automática da bacia o Modelo Digital de Elevação (MDE), a partir do projeto TOPODATA, obtido junto ao Instituto de Pesquisas Espaciais (INPE) e utilizado o SIG gratuito e de linguagem aberta QGIS, com auxílio dos plugins do GRASS e do SAGA, possibilitando a determinação de parâmetros que remetem a drenagem, forma e relevo. A microbacia possui uma área de 9,706 km2, perímetro de 20,673 km. De acordo com os índices morfométricos é considerada de 4ª ordem, bastante ramificada, de formato pouco alongado, apresenta pequena tendência a grandes enchentes, o relevo correspondeu de plano a suave ondulado. Com isso, a partir do emprego de ferramentas geotecnológicas contribuindo para o zoneamento ambiental de uma área e podendo cooperar para o gerenciamento dos recursos hídricos, bem como para uso e ocupação do solo de forma sustentável.Palavras-chave: diagnóstico, geotecnologias, sensoriamento remoto. Morphometric characterization of the Açude Grande hydrographic microbasin in the semiarid region of Rio Grande do Norte A B S T R A C TMorphometric studies assist in the planning and management of micro watersheds, determining the physical, relief and drainage parameters to assess the hydrological behavior of the basin. The present study aimed to characterize the morphometry of the micro watershed of Açude Grande, Caraúbas/RN. The Digital Elevation Model (DEM) was used to automatically delimit the basin, from the TOPODATA project, from the Space Research Institute (SRI) and use the free GIS and the open language QGIS, with the aid of the SAGA plugin. A micro watershed has an area of 9.706 km2, with a perimeter of 20.673 km. According to the morphometric indices, it is considered to be of 4th order, quite branched, of little elongated shape, with small tendencies to large fillings, or the relief corresponds to a smooth wavy plane. With this, using geotechnological tools to contribute to the environmental zoning of an area and can cooperate for the management of water resources, as well as for the use and occupation of sustainable soil.Keywords: Environmental diagnosis; Geotechnologies; Morphometry.
We studied the morphology of the copulatory organ of Ortalis canicollis and its evolution in birds. The phallus of O. canicollis is intromittent, with a blind tubular cavity and two distinct regions when erect: the base of the phallus, which shows the mucosa smooth and lined by a pseudostratified columnar epithelium, and the tubular portion, which shows the mucosa lined by a keratinized stratified squamous epithelium with little knobs. The phallus includes two vascular bodies at the cranial portion in the urodeum. A fibrocartilaginous body anchors the tubular portion therefrom up to the eversible portion. A branched elastic ligament inserts on different regions of the tubular portion. The phallus is plesiomorphic in birds and it has disappeared in Megapodius, Leipoa and Neoaves. The asymmetric phallus evolved early and it was retained in the basal branches of birds. The intromittent phallus is plesiomorphic in birds (found in Archosauria's ancestor), but Crypturellus, Numididae, Odontophoridae and Phasianidae have developed a non‐intromittent phallus a posteriori. The blind tubular cavity and the fibrocartilaginous body evolved as an adaptive convergence many times in birds. Therefore, this study shed some light on morphological aspects of the phallus and contributed to understand its evolution in birds.
Economic feasibility analysis is essential in the decision-making process regarding investment in photovoltaic projects. Project profitability must be measured based not only on the costs and revenues, but also on the climatic particularities of the different locations. Therefore, performing simulations of technical and economic performance of photovoltaic models is fundamental. Thus, the objective of this study was to analyze deterministic and stochastic models of investments in two types of photovoltaic systems, one incorporated into the enterprise’s architecture (a BIPV system) and the other, a conventional one, in different Brazilian locations, covering the predominant climatic factors in the country. The methodological proposal consisted of choosing a city in Brazil with each predominant climate type and compiling its data on irradiation, monthly sunshine hours, and tariffs of the electric power concessionaire, to simulate the electrical generation performance of the proposed photovoltaic systems and their profitability. For the economic analysis, the cumulative probability of positive Net Present Value (NPV) returns was obtained through deterministic simulations in all municipalities. Only the municipality of Pau dos Ferros-RN was chosen to perform 10,000 stochastic simulations, and its cumulative probabilities of positive NPV returns were obtained. In both models of photovoltaic technology analyzed and simulation logics, 100% of the NPVs were positive, indicating profitable cash flows in all scenarios. However, some municipalities obtained better results than others when the climate types favored sunny weather. Moreover, although all cases returned positive NPVs, the conventional model proved to be more economically attractive than BIPV system.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.