Consulta: subjectFacets:"Alpha diversity"
Registros recuperados: 8
Data/hora: 17/06/2024 03:45:29

The pattern of high plant diversity of Neotropical inselbergs: highlighting endemic, threatened and unique species
Provedor de dados: Acta Botanica Brasilica
Autores: Pinto-Junior,Herval Vieira; Villa,Pedro Manuel; Pereira,Miriam Cristina Alvarez; Menezes,Luis Fernando Tavares de.
ABSTRACT Understanding how multiple drivers shape plant community diversity across environmental gradients is one of the most important issues in plant ecology and biodiversity conservation. We aimed to analyse plant community structure and diversity in four inselbergs in Espírito Santo State, Brazil. We evaluated species diversity, floristic composition and similarity, phytosociological structure, occurrence, and conservation status of rupicolous flora in the inselberg communities. We used field expeditions and plant inventory data from 370 sampling units. We estimated floristic similarity and compared diversity indexes among inselbergs. We observed marked differences in community structure and diversity among inselbergs, where the southern region had the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha diversity; Atlantic Forest; Biodiversity conservation; Floristic composition; Latitudinal gradient; Phytosociological structure; Rock outcrop.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400645

First inventory of benthic mollusks associated with the reef ecosystems of Morro de São Paulo on Tinharé Island in northeastern Brazil
Provedor de dados: Biota Neotropica
Autores: Lima,Silvio Felipe Barbosa; Lima,Bianca Vieira; Abreu,Evandro Cosmo; Oliveira,Geraldo Semer Pomponet; Lucena,Rudá Amorim; Mendonça,Luana Marina de Castro; Prata,Jéssica; Souza,J. Weverton S. de.
Abstract: The reef ecosystems of Morro de São Paulo are located in the Tinharé-Boipeba Environmental Preservation Area which was established in 1992 in the state of Bahia, Brazil. Despite this area has been created more than two decades ago, no study has provided knowledge on the invertebrate biodiversity associated with such reef ecosystems. The present investigation provides the first inventory of benthic mollusks associated with the reef ecosystems of Morro de São Paulo based on the collection of living specimens and fresh empty as well as some worn shells. Mollusks were sampled in January 2015 and August 2016 through intensive searches from the intertidal to shallow subtidal habitats of the reefs on three beaches of Morro de São Paulo. Taxonomic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha diversity; Malacofaunal composition; Gastropoda; Bivalvia; Polyplacophora.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000400312

Diversity of harvestmen (Arachnida, Opiliones) in Parque da Onça Parda, southeastern Brazil
Provedor de dados: Iheringia Série Zoologia
Autores: Resende,Leonardo P. A.; Pinto-da-Rocha,Ricardo; Bragagnolo,Cibele.
The environment most diverse in harvestmen species is the Atlantic Forest of São Paulo. However, there remains a lack of studies regarding their communities in certain regions. Among these regions is one south of the Paranapiacaba mountain range in the state of São Paulo, the Parque da Onça Parda (POP). Through nocturnal collections and pitfall traps, the region's harvestmen community has been studied. The observed richness of this site included 27 species, with dominance of three species: Holcobunus nigripalpis Roewer, 1910, Neosadocus maximus (Giltay, 1928) and Munequita sp., accounting for 68.4% of harvestmen abundance. This makes the diversity of POP more similar to the semideciduous Atlantic Forest communities of the interior than to those of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daddy longlegs; Alpha diversity; Atlantic Rain Forest.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000100014

Forest fragmentation shapes the alpha–gamma relationship in plant diversity
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Almoussawi, Ali; Lenoir, Jonathan; Jamoneau, Aurélien; Hattab, Tarek; Wasof, Safaa; Gallet‐moron, Emilie; Garzon‐lopez, Carol X.; Spicher, Fabien; Kobaissi, Ahmad; Decocq, Guillaume; Collins, Beverly.
Questions Forest fragmentation affects biodiversity locally (α diversity) and beyond — at relatively larger scales (γ diversity) — by increasing dispersal and recruitment limitations. Yet, does an increase in fragmentation affect the relationship between α and γ diversity and what can we learn from it? Location Northern France. Methods We surveyed 116 forest patches across three fragmentation levels: none (continuous forest); intermediate (forest patches connected by hedgerows); and high (isolated forest patches). Plant species richness of both forest specialists and generalists was surveyed at five nested spatial resolutions across each forest patch: 1 m2; 10 m2; 100 m2; 1,000 m2; and total forest patch area. First, we ran log‐ratio models to quantify the...
Tipo: Text
Palavras-chave: Agricultural landscapes; Alpha diversity; Anthropogenic disturbances; Community assembly; Dispersal limitations; Gamma diversity; Habitat conservation strategies; Habitat fragmentation; Local-regional richness relationship; Metacommunity dynamics.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00592/70438/68577.pdf

Measure and mis-measure of species diversity in deep-sea chemosynthetic communities
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gauthier, Olivier; Sarrazin, Jozee; Desbruyeres, Daniel.
Our knowledge of species diversity in deep-sea chemosynthetic communities has come a long way since their discovery in the late 1970s, However, their study poses serious challenges that are linked to their remoteness, the variable selectivity and effectiveness of sampling tools in different conditions, a lack of consensus on the size compartments and sieve size used in practice, and the persistent discovery of species that are previously unknown to science. Still, with increasing accessibility and new sampling tools, quantitative data are becoming both more frequent and extensive, reducing limitations in the estimation and comparison of species diversity. Here, we review the literature for common difficulties encountered in the measurement and comparison...
Tipo: Text
Palavras-chave: Deep-sea ecosystems; Chemosynthetic community; Species diversity; Richness; Evenness; Rarefaction; Diversity profiles; Diversity ordering; Alpha diversity; Statistical analysis.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00001/11274/7842.pdf

Environment heterogeneity and seasonal effects in ground-dwelling ant (Hymenoptera: Formicidae) assemblages in the Parque Estadual do Rio Doce, MG, Brazil
Provedor de dados: Neotropical Entomology
Autores: Coelho,Igor R.; Ribeiro,Sérvio P.
This work aimed to explore the response of ant species assemblage to contrasting types of forests in a semideciduous stationary rainforest, in the Parque Estadual do Rio Doce, South Eastern Brazil. We compared antropomorphic borders of this park and natural ecotones, such as lake margins continuous with forests, as well as preserved forests far from ecotones. We investigated whether ground-dwelling ant species richness, abundance and composition would change according to forest types and ecotones. We expected greater species richness in interior tall forest, compared with low forest or ecotone habitats. In addition, we tested the effect of climate seasonality on ant assemblages found in each studied vegetation type. Each forest type was surveyed based on a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha diversity; Beta diversity; Edge effect; Functional groups; Atlantic rainforest.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000100004

Fauna de Muscidae (Diptera) em três localidades do Estado do Paraná, Brasil, capturada por armadilha Malaise
Provedor de dados: Revista Brasileira de Entomologia
Autores: Costacurta,Nise do Carmo; Marinoni,Renato C.; Carvalho,Claudio J. B. de.
During two years, from August 1986 to July 1988, the entomofauna of some preserved areas of Parana State, southern Brazil, was sampled in a project called "Levantamento da Fauna Entomológica no Estado do Paraná (PROFAUPAR)". Specimens of Muscidae (Diptera) were sorted out from the material collected using Malaise traps in three of the eight sites sampled (Colombo, Ponta Grossa and Guarapuava) in the first year (August 1986 to July 1987). A total of 7,014 specimens of Muscidae was captured and 91 species were identified. Neodexiopsis flavipalpis Albuquerque was the most abundant species in Ponta Grossa (672 specimens) and in Guarapuava (332 specimens). For Colombo, the most abundant species was Neodexiopsis vulgaris Couri &amp;amp; Albuquerque (172...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha diversity; Beta diversity; Faunistic; Seasonality; Species richness estimators.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262003000300005

Influences of the area, shape and connectivity of coastal lakes on the taxonomic and functional diversity of fish communities in Southern Brazil
Provedor de dados: Revista Brasileira de Zoologia
Autores: Hartz,Sandra M.; Rocha,Elise A.; Brum,Fernanda T.; Luza,André L.; F.R.,Taís de; Becker,Fernando G.
ABSTRACT In this study we investigated the influence of landscape variables on the alpha taxonomic and functional diversity of fish communities in coastal lakes. We built an analytical framework that included possible causal connections among variables, which we analyzed using path analysis. We obtained landscape metrics for the area, shape and connectivity (estuary connectivity and primary connectivity to neighboring lakes) of 37 coastal lakes in the Tramandaí River Basin. We collected fish data from 49 species using standardized sampling with gillnets and obtained a set of traits related to dispersal abilities and food acquisition. The model that best explained the taxonomic diversity and functional richness took into account the shape of the lakes....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha diversity; Environmental filters; Limiting similarity; Neutral paradigm; Geographic information system.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702019000100316