Consulta: creatorFacets:"Gasper,André Luís de"
Registros recuperados: 7
Data/hora: 10/06/2024 17:14:17

Insights from a large-scale inventory in the southern Brazilian Atlantic Forest
Provedor de dados: 63
Autores: Vibrans,Alexander Christian; Gasper,André Luís de; Moser,Paolo; Oliveira,Laio Zimermann; Lingner,Débora Vanessa; Sevegnani,Lucia.
ABSTRACT: A key issue in large-area inventories is defining a suitable sampling design and the effort required to obtain reliable estimates of species richness and forest attributes, especially in species-diverse forests. To address this issue, data from 418 systematically distributed 0.4 ha plots were collected. Estimators of nonparametric species richness were employed to assess the floristic representativeness of data collected in three forest types in the Brazilian Atlantic Forest. The sampling sufficiency of forest attributes was evaluated as a function of sample size. Altogether, 831 tree/shrub species were recorded. The data acquired through the systematic sampling design were representative of both species richness and basal area. The confidence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest attributes estimation; Species richness; Forest monitoring; Systematic sampling; Secondary forests.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101000

Pteridófitas de Santa Catarina: um olhar sobre os dados do Inventário Florístico Florestal de Santa Catarina, Brasil
Provedor de dados: 39
Autores: Gasper,André Luís de; Salino,Alexandre; Vibrans,Alexander C.; Sevegnani,Lucia; Verdi,Marcio; Korte,Alexandre; Santos,Anita Stival dos; Dreveck,Susana; Cadorin,Tiago João; Schmitt,Juliane Luzia; Caglioni,Eder.
Uma das unidades federativas com melhor conhecimento de sua flora, Santa Catarina é o primeiro estado a concluir o Inventário Florístico Florestal na atualidade. Coberto por Floresta Ombrófila Densa, Floresta Ombrófila Mista, Floresta Estacional Decidual e formações associadas, possui grande riqueza de espécies. Este trabalho visa apresentar as espécies de pteridófitas coletadas nas 563 unidades amostrais visitadas. Ao todo 324 espécies foram registradas, das quais 300 são samambaias e 24, licófitas. Estas pertencem a 29 famílias e 94 gêneros, sendo as famílias com maior riqueza específica Polypodiaceae (48 espécies), Pteridaceae (42) e Dryopteridaceae (38). Os gêneros com maior diversidade de espécies foram Asplenium e Thelypteris, com 27 espécies,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Samambaia; Mata Atlântica; Floresta ombrófila; Floresta estacional; Restinga.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000200018

Improving collection efforts to avoid loss of biodiversity: lessons from comprehensive sampling of lycophytes and ferns in the subtropical Atlantic Forest
Provedor de dados: 39
Autores: Gasper,André Luís de; Eisenlohr,Pedro V.; Salino,Alexandre.
ABSTRACT Estimating species richness with herbarium data and new collections allows us to understand the distribution of diversity. We investigated the accuracy of lycophyte and fern sampling along a vegetation gradient in the subtropical Atlantic Forest in southern Brazil. We compiled lycophyte and fern collection metadata and estimated species richness and assessed sampling accuracy for sixty 50 x 50 km units using ACE, Chao 1, Chao 2, Jackknife 1 and Jackknife 2 estimators. We compiled data for 12,779 fern specimens of 441 species, 67 of which were sampled in only one unit (singletons) and 35 in two units (duplicates). Of the 60 units examined, only 11 had observed values that were above 70% of their estimated values, and 14 had observed levels between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Botanical collections; Estimators; Hotspot; Pteridophyte; Southern Brazil; Species richness estimates.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200166

Inventário de Dicksonia sellowiana Hook. em Santa Catarina
Provedor de dados: 39
Autores: Gasper,André Luís de; Sevegnani,Lucia; Vibrans,Alexander Christian; Uhlmann,Alexandre; Lingner,Débora Vanessa; Verdi,Marcio; Dreveck,Susana; Stival-Santos,Anita; Brogni,Eduardo; Schmitt,Ronnie; Klemz,Guilherme.
A intensa exploração comercial de Dicksonia sellowiana a deixaram na categoria de ameaçada de extinção, sendo incluída na lista brasileira de espécies da flora ameaçada de extinção. Por isso, o presente trabalho visa apresentar o estudo da distribuição das populações de D. sellowiana para apontar os locais de maior ocorrência da espécie em Santa Catarina, e avaliar a relação da densidade populacional com fatores ambientais, como altitude e clima. Foram instaladas 225 unidades amostrais, com 4.000 m² nas regiões do planalto e oeste catarinense, baseadas na grade de 10 km x 10 km conforme procedimento do Inventário Florístico Florestal de Santa Catarina. Nestas 225 unidades amostrais, D. sellowiana foi encontrada em 94, com variação de um a 391 indivíduos. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floresta Ombrófila Mista; Dicksoniaceae; Xaxim-bugio; Distribuição geográfica; Estrutura populacional; Ameaça de extinção.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000400005

Brazilian herbaria: an overview
Provedor de dados: 39
Autores: Gasper,André Luís de; Stehmann,João Renato; Roque,Nádia; Bigio,Narcísio C.; Sartori,Ângela Lúcia Bagnatori; Grittz,Guilherme Salgado.
ABSTRACT Herbaria represent irreplaceable repositories of biodiversity and are used to answer questions about conservation, ecology, systematics, and other sciences. In this sense, we characterize the infrastructure, human resources, and idiosyncrasies of Brazilian herbaria. To achieve this goal, curators were sent a structured and standardized questionnaire to gather information about herbaria. The Brazilian Herbaria Network listed 216 active herbaria in the year 2018, of which 139 answered the questionnaire. These herbaria hold 6,741,469 samples in their collections and more than 39,000 type samples. Most herbaria are in federal universities (40.28 %). Only 24 % of the curators considered that their herbarium is valued by their institutions and 52 %...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Biological collections; Natural history; Public policies.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000200352

Environmental factors affect population structure of tree ferns in the Brazilian subtropical Atlantic Forest
Provedor de dados: 39
Autores: Schwartz,Carlos Eduardo; Gasper,André Luís de.
ABSTRACT Tree ferns are important elements of tropical forests, mainly because they are common and provide microhabitats for epiphytic plants. Due to their ecological importance, the aim of this study was to evaluate population structure, distribution, and influence of environmental variables on tree ferns in the state of Santa Catarina, southern Brazil. All tree ferns with a diameter at breast height ≥ 10 cm on 418 sampling units (SUs) systematically distributed throughout the study area were measured (total sampled area of ​​153.4 ha). Population structure was evaluated through classical phytosociological parameters and the relationships among dominance and environmental variables were evaluated through multiple linear regression models. Dicksonia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyatheaceae; Dicksoniaceae; Environmental variables; Population structure; Regression analysis; Tree ferns.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100204

Toward a better understanding of the subtropical Atlantic Forest in the state of Santa Catarina, Brazil: tree sampling accuracy, species richness and frequency of rare species
Provedor de dados: 39
Autores: Rezende,Vanessa Leite; Eisenlohr,Pedro V.; Gasper,André Luís de; Vibrans,Alexander Christian; Oliveira-Filho,Ary Teixeira de.
Accurate knowledge of floristic composition is crucial when planning and designing research projects and public policies. In this study, our goal was to assess tree sampling accuracy and to identify sites with higher concentrations of rare tree species, as well as those with the highest tree species richness, in the state of Santa Catarina, Brazil. We determined sampling accuracy using the first-order jackknife and Chao 2 estimators, calculated the number of rare species (singletons and doubletons) and applied sampled-based rarefaction. We found that sample accuracy (estimated vs. observed values) was over 90% for the state as a whole, the best estimates having been obtained for the areas of rain forest (first-order jackknife: 91%; Chao 2: 95%). Of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chao 2; Rainforest; First-order jackknife; Rare species; Semideciduous forest.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300011