Beta Diversity
Mostrando 13-24 de 285 artigos, teses e dissertações.
-
13. Bird diversity along a gradient of fragmented habitats of the Cerrado
ABSTRACT Understanding the factors that affect biodiversity is of central interest to ecology, and essential to species conservation and ecosystems management. We sampled bird communities in 17 forest fragments in the Cerrado biome, the Central-West region of Brazil. We aimed to know the communities structure pattern and the influence of geographical distanc
An. Acad. Bras. Ciênc.. Publicado em: 11/12/2017
-
14. Can nearby eutrophic reservoirs sustain a differentiated biodiversity of planktonic microcrustaceans in a tropical semiarid basin?
ABSTRACT This paper aims to compare alpha and beta diversities of planktonic microcrustaceans from three reservoirs located nearby in a tropical semiarid basin. Our hypothesis was that alpha and beta diversities of the community are different, although the ecosystems are located close to each other. We carried out two sampling campaigns: dry and rainy season
An. Acad. Bras. Ciênc.. Publicado em: 2017-12
-
15. Avian Communities in the Amazonian Cangas Vegetation: Biogeographic Affinities, Components of Beta-Diversity and Conservation
ABSTRACT The Amazonian cangas is a vegetation type distributed as patches of open vegetation embedded in a matrix of tropical forest and that grows over iron-rich soils in the Serra dos Carajás region. To characterize cangas avifauna, we surveyed birds in eight patches varying from 43 to 1,366 hectares. Cangas avifauna has compositional affinities with sava
An. Acad. Bras. Ciênc.. Publicado em: 14/08/2017
-
16. Assessment of the occurrence and richness of arbuscular mycorrhizal fungal spores by direct analysis of field samples and trap culture - a comparative study
ABSTRACT In this work, we hypothesized that two spore-based methods, direct analysis of field samples and trap cultures, simultaneously used for assessment of occurrence and species richness of arbuscular mycorrhizal fungi (AMF) may vary in their efficiency according to the environmental conditions and the total AMF species richness of the evaluated ecosyste
An. Acad. Bras. Ciênc.. Publicado em: 07/08/2017
-
17. Effects of changes in the riparian forest on the butterfly community (Insecta: Lepidoptera) in Cerrado areas
ABSTRACT Preserved riparian vegetation usually has greater environmental complexity than the riparian vegetation modified by human actions. These systems may have a greater availability and diversity of food resources for the species. Our objective was to evaluate the effect of changes on the structure of the riparian forest on species richness, beta diversi
Rev. Bras. entomol.. Publicado em: 2017-01
-
18. Zoogeography of Elasmobranchs in the Colombian Pacific Ocean and Caribbean Sea
ABSTRACT In order to investigate zoogeographical patterns of the marine elasmobranch species of Colombia, species richness of the Pacific and Caribbean and their subareas (Coastal Pacific, Oceanic Pacific, Coastal Caribbean, Oceanic Caribbean) was analyzed. The areas shared 10 families, 10 genera and 16 species of sharks, and eight families, three genera and
Neotrop. ichthyol.. Publicado em: 07/07/2016
-
19. Occurrence and characteristics of extended spectrum beta-lactamases-producing Enterobacteriaceae from foods of animal origin
Abstract Presence of extended spectrum beta-lactamases (ESBL) in bacteria is a growing health concern of global significance. The local, regional, national, and international epidemiological studies for extended spectrum beta-lactamases-producing Enterobacteriaceae and their encoding genes in foods are still incomplete. The objective of this study was to det
Braz. J. Microbiol.. Publicado em: 2016-06
-
20. Tree species of South America central savanna: endemism, marginal areas and the relationship with other biomes
Biological knowledge is important for guidance of conservation polices. In the Cerrado, an extremely diverse biome, the last synthesis of floristic knowledge has more than ten years. To understand the progress on the information, our aim was quantify the tree species of the Cerrado, and assess their distribution. We compiled 167 inventories and rapid surveys
Acta Bot. Bras.. Publicado em: 2016-03
-
21. Diversity of anurans in dry forest fragments of a subtropical region in Brazil
RESUMO Este estudo teve como objetivo identificar e comparar a diversidade entre duas áreas inseridas em diferentes matrizes localizadas na Floresta Estacional Semidecidual; comparar a composição e a diversidade registradas com outras populações; e avaliar quais critérios usados aqui foram mais importantes durante a amostragem delas. Os dados foram obt
An. Acad. Bras. Ciênc.. Publicado em: 2016
-
22. Alpha and beta diversity of phytoplankton in two subtropical eutrophic streams in southern Brazil
This paper reports the alpha and beta diversity of phytoplankton communities of two streams differing in land use. We analyzed which environmental conditions affect diversity of the phytoplankton communities and tested the hypothesis that stream stretches protected by forests will have lower species richness, whereas higher beta-diversity would occur among t
Acta Bot. Bras.. Publicado em: 2015-12
-
23. Investigating alpha-globin structural variants: a retrospective review of 135,000 Brazilian individuals
Background: Brazil has a multiethnic population with a high diversity of hemoglobinopathies. While screenings for beta-globin mutations are far more common, alterations affecting alpha-globin genes are usually more silent and less well known. The aim of this study was to describe the results of a screening program for alpha-globin gene mutations in a repres
Rev. Bras. Hematol. Hemoter.. Publicado em: 2015-04
-
24. Evaluation of the microbial diversity in sequencing batch reactor treating linear alkylbenzene sulfonate under denitrifying and mesophilic conditions using swine sludge as inoculum
The objective of this study was to evaluate the degradation of Linear Alkylbenzene Sulfonate (LAS) in anaerobic sequencing batch reactor (ASBR) under denitrifying conditions using swine sludge as inoculum. The reactor was operated for 104 days with synthetic substrate containing nitrate, and LAS was added later (22 mg/L). Considering the added mass of the LA
Braz. arch. biol. technol.. Publicado em: 06/03/2015