Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 59
Primeira ... 123 ... Última
Imagem não selecionada

Imprime registro no formato completo
A molecular method for the detection of sally lightfoot crab larvae (Grapsus grapsus, Brachyura, Grapsidae) in plankton samples Genet. Mol. Biol.
Ströher,Patrícia R.; Firkowski,Carina R.; Freire,Andrea S.; Pie,Marcio R..
The decapod Grapsus grapsus is commonly found on oceanic islands of the Pacific and Atlantic coasts of the Americas. In this study, a simple, quick and reliable method for detecting its larvae in plankton samples is described, which makes it ideal for large-scale studies of larval dispersal patterns in the species.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dispersal; Aratu; Sayapa; Molecular marker.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000300026
Imagem não selecionada

Imprime registro no formato completo
A process‐based model supports an association between dispersal and the prevalence of species traits in tropical reef fish assemblages ArchiMer
Donati, Giulia Francesca Azzurra; Parravicini, Valeriano; Leprieur, Fabien; Hagen, Oskar; Gaboriau, Theo; Heine, Christian; Kulbicki, Michel; Rolland, Jonathan; Salamin, Nicolas; Albouy, Camille; Pellissier, Loïc.
Habitat dynamics interacting with species dispersal abilities could generate gradients in species diversity and prevalence of species traits when the latter are associated with species dispersal potential. Using a process‐based model of diversification constrained by a dispersal parameter, we simulated the interplay between reef habitat dynamics during the past 140 million years and dispersal, shaping lineage diversification history and assemblage composition globally. The emerging patterns from the simulations were compared to current prevalence of species traits related to dispersal for 6315 tropical reef fish species. We found a significant spatial congruence between the prevalence of simulated low dispersal values and areas with a large proportion of...
Tipo: Text Palavras-chave: Biodiversity; Dispersal; Diversification; Mechanistic models; Reef fish; Traits.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00516/62750/67136.pdf
Imagem não selecionada

Imprime registro no formato completo
ALLOCATING BIOSECURITY RESOURCES IN SPACE AND TIME AgEcon
Cacho, Oscar J.; Hester, Susan M..
Invasive species can cause significant damage to natural environments, agricultural systems, human populations and the economy as a whole. Biological invasions are complex dynamic systems which are inherently uncertain and their control involves allocation of surveillance and treatment resources in space and time. A complicating factor is that there are at least two types of surveillance: active and passive. Active surveillance, undertaken by pest control agencies, has high sensitivity but generally low coverage because of its high cost. Passive surveillance, undertaken by the public, has low sensitivity and may have high coverage depending on human population density. Its effectiveness depends on the extent to which information campaigns succeed in...
Tipo: Conference Paper or Presentation Palavras-chave: Search theory; Invasive species; Dispersal; Passive surveillance.; Environmental Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/100535
Imagem não selecionada

Imprime registro no formato completo
Aspects on gametogenesis, fertilization and embryogenesis of two deep-sea polychaetes from Eastern Atlantic cold seeps ArchiMer
Gaudron, S. M.; Hourdez, S.; Olu, Karine.
We investigated two gonochoristic species of annelid polychaetes (one siboglinid and one polynoid) from cold seeps that ranged from 525 m to 3300 m in depth (Guiness, Worm Hole and Regab pockmarks) on the Gabon and Congo continental margins (Gulf of Guinea). Different aspects of gametogenesis (oocyte diameter, presence of ovisac, spermatozoa shape, and fecundity), fertilization (in vitro fertilization experiments: IVF) and embryogenesis (cleavage rate) were studied. The sampled siboglinid was a new species of Lamellibrachia and the second population of this genus in the Eastern Atlantic. Mean oocyte diameter was about 100 µm and fully-grown primary oocytes were stored in an ovisac, as in other studied siboglinids. The presence of a single spermatozoon was...
Tipo: Text Palavras-chave: Branchipolynoe; Cold seeps; Dispersal; Lamellibrachia; Polynoid; Reproduction; Siboglinid.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00405/51644/52192.pdf
Imagem não selecionada

Imprime registro no formato completo
Behavior of the combined radial post-feeding larval dispersal of the blowflies Chrysomya megacephala and Chrysomya albiceps (Diptera, Calliphoridae) and implications for forensic entomology BABT
Gomes,Leonardo; Sanches,Marcos Rogério; Von Zuben,Claudio José.
The aims of this work was to study the life stages of Chrysomya megacephala in a circular arena allowing the combined radial post-feeding dispersal from the center of the arena of C. albiceps and C. megacephala larvae. To determine the location of each pupa, the distance from the center, the depth and weight of each pupa formed were analyzed. For the larvae of C. albiceps, females released buried deeper than males, reaching an average depth of 10.74 cm and C. megacephala larvae presented greater average results than C. albiceps for all variables, particularly distance, which was 16.02 cm for this species and 12.30 cm for C. albiceps. C. albiceps larvae preyed on 30 C. megacephala larvae in both experiments. These results could be used in forensic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Blowflies; Calliphoridae; Dispersal; Forensic Entomology; Chrysomya albiceps; Chrysomya megacephala.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200013
Imagem não selecionada

Imprime registro no formato completo
Beyond Roadkill, Radiotracking, Recapture and FST—a Review of Some Genetic Methods to Improve Understanding of the Influence of Roads on Wildlife Ecology and Society
Simmons, Jody M; Monash University; Australian Centre for Biodiversity; jodymichellesimmons@yahoo.com.au; Sunnucks, Paul; Monash University; Australian Centre for Biodiversity; paul.sunnucks@sci.monash.edu.au; Taylor, Andrea C; Monash University; Australian Centre for Biodiversity; andrea.taylor@sci.monash.edu.au; van der Ree, Rodney; Australian Research Centre for Urban Ecology, Royal Botanic Gardens Melbourne; rvdr@unimelb.edu.au.
Habitat fragmentation continues to occur despite increasing evidence of its adverse effects on ecosystems. One of the major detrimental effects of roads and traffic is the creation of barriers or filters to the movement of wildlife, ultimately disconnecting some populations. Our understanding of the extent to which roads reduce the movement of biota is mostly based on field-based observational methods of inferring animal movement, and to a much smaller extent, on allele frequency-based genetic analyses. Field-based methods, as it is typically feasible to apply them, tend to be informative at fine temporal and spatial scales. Allele frequency-based genetic methods are informative at broad geographic scales but at timescales usually greater than recent...
Tipo: Peer-Reviewed Insight Palavras-chave: Barrier; Dispersal; Gene flow; Genotypic analyses; Habitat fragmentation; Road ecology.
Ano: 2010
Imagem não selecionada

Imprime registro no formato completo
Clonal growth and dispersal potential of Leiothrix flagellaris Ruhland (Eriocaulaceae) in the rocky grasslands of Southeastern Brazil Rev. Bras. Bot.
Figueira,José Eugênio Côrtes; Del Sarto,Mário César Laboissiérè.
Leiothrix flagellaris is a small clonal plant that grows in sandy/rocky, nutrient poor soils in the rocky grasslands ("campos rupestres") of southeastern Brazil. In the rainy season most of their flower heads differentiate into small rosettes, produced by pseudovivipary, and connected to the mother-plant by flexible, elongated stalks that can reach up to 90cm. Most of these rosettes remain suspended over rocks or over the sparse herbaceous surrounding vegetation, while a few arch low enough to come into contact with the surrounding soil and take root. These suspended rosettes can reach diameters comparable to currently rooted and reproductively active rosettes produced during previous reproductive periods. As the rooted rosettes grow up, their potential to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canopy development; Clonal reproduction; Demography; Dispersal; Pseudovivipary.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000400012
Imagem não selecionada

Imprime registro no formato completo
Colonization and dispersal rates of two non-native crayfish species (Pacifastacus leniusculus and Procambarus clarkii) in NE Portugal IPB - Escola Superior Agrária
Bernardo, J.M.; Costa, A.M.; Bruxelas, S.; Teixeira, Amílcar.
In Europe, a generalized regression of the native crayfish was observed during the past decades. Simultaneously, several non-native species spread in most countries. In Portugal, the red swamp crayfish, Procambarus clarkii, is now occurring in most inland waters. The NE Portugal is one of the most isolated and low populated regions of Western Europe. Most rivers in these region present low levels of human impact and some are actually pristine. Recently, two American crayfish species reached the area: signal crayfish (Pacfastacus leniusculus) coming from Spain and red swamp crayfish. The isolation and the natural conditions of these rivers make them particularly valuable for the study of crayfish colonization and spreading. The colonization by both species...
Tipo: ConferenceObject Palavras-chave: Pacifastacus leniusculus; Procambarus clarkia; Dispersal; Coexistence.
Ano: 2010 URL: http://hdl.handle.net/10198/4926
Imagem não selecionada

Imprime registro no formato completo
Comparing spatial diversification and meta-population models in the Indo-Australian Archipelago ArchiMer
Chalmandrier, Loic; Albouy, Camille; Descombes, Patrice; Sandel, Brody; Faurby, Soren; Syenning, Jens-christian; Zimmermann, Niklaus E.; Pellissier, Loic.
Reconstructing the processes that have shaped the emergence of biodiversity gradients is critical to understand the dynamics of diversification of life on Earth. Islands have traditionally been used as model systems to unravel the processes shaping biological diversity. MacArthur and Wilson's island biogeographic model predicts diversity to be based on dynamic interactions between colonization and extinction rates, while treating islands themselves as geologically static entities. The current spatial configuration of islands should influence meta-population dynamics, but long-term geological changes within archipelagos are also expected to have shaped island biodiversity, in part by driving diversification. Here, we compare two mechanistic models providing...
Tipo: Text Palavras-chave: Allopatric speciation; Continental drift; Dispersal; Diversification; Meta-population model; Neutral model.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00602/71377/69825.pdf
Imagem não selecionada

Imprime registro no formato completo
Contribuicao para o conhecimento do Pantanal Passo da Lontra. Repositório Alice
PAULA, J.E. de; CONCEICAO, C. de A.; MACEDO, M..
O Pantanal Passo da Lontra esta localizado no Municipio de Miranda, MS, entre as coordenadas 20 30'S e 56 15'W. A area foi de 180 km2, onde ocorre uma vegetacao diversificada, em areas inundaveis, permanentemente inundadas, campos de murundus, cordilheiras e chaco. As coletas foram realizadas durante os meses de fevereiro, maio, julho, agosto, novembro e dezembro, entre 1989 a 1991. Coletaram-se e foram identificadas 76 especies, sendo 34 de habito arboreo. Em 1.000 m2 de mata inventariada, o rendimento de madeira seca foi de 61.874 ton, provenientes de 131 arvores. Estudaram-se tambem os agentes de dispersao de frutos e sementes e constataram-se as seguintes classes: Anemocoria, Artidactilocoria, Autocoria, Hidrocoria, ictiocoria, Chiropterocoria,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pantanal; Dispersao de frutos; Dispersao de sementes; Chacos; Inventario quantitativo; Dispersal; Habitat; Qualitative inventory.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104220
Imagem não selecionada

Imprime registro no formato completo
Detecting Critical Scales in Fragmented Landscapes Ecology and Society
Keitt, Timothy; State University of New York at Stony Brook; Timothy.Keitt@StonyBrook.Edu; Urban, Dean L; Duke University; deanu@pinus.env.duke.edu; Milne, Bruce T; University of New Mexico; bmilne@sevilleta.unm.edu.
We develop methods for quantifying habitat connectivity at multiple scales and assigning conservation priority to habitat patches based on their contribution to connectivity. By representing the habitat mosaic as a mathematical "graph," we show that percolation theory can be used to quantify connectivity at multiple scales from empirical landscape data. Our results indicate that connectivity of landscapes is highly scale dependent, exhibiting a marked transition at a characteristic distance and varying significantly for organisms with different dispersal behavior. More importantly, we show that the sensitivity and importance of landscape pattern is also scale dependent, peaking at scales associated with the percolation transition. In addition, the...
Tipo: Peer-Reviewed Reports Palavras-chave: Connectivity; Conservation in fragmented landscapes; Dispersal; Fragmentation; Habitat connectivity vs. dispersal distance; Landscape; Landscape graphs; Metapopulation; Percolation; Quantifying habitat connectivity at multiple scales; "stepping stone" patch; Strix occidentalis lucida..
Ano: 1997
Imagem não selecionada

Imprime registro no formato completo
Disjunct Hepaticae in tropical America and Africa Naturalis
Gradstein, S.R.; Pócs, T.; Váňa, J..
An increasingly large number of macrodisjunct species is emerging from recent literature dealing with taxonomy and floristics of tropical bryophytes. This paper reviews present knowledge concerning Afro-American disjunctions in Hepaticae and seeks to interprete the data in the light of current phytogeographical theory. Numerous new floristic records and range extensions are given and some taxonomic novelties are proposed. For 35 Afro-American species known three main distribution types are recognized, each further subdivided: Tropical Afro-American (lowland, montane and the alpine element), Subtropical-Mediterranean (southern, wide element) and Temperate-Subantarctic (southern, wide element). Most species belong to Jungermanniales except for the...
Tipo: Article / Letter to the editor Palavras-chave: Africa; America; Disjunction; Dispersal; Hepaticae; Plate tectonics; Phytogeography.; Taxonomy; Vicariants.
Ano: 1983 URL: http://www.repository.naturalis.nl/record/535250
Imagem não selecionada

Imprime registro no formato completo
Dispersal syndromes related to edge distance in cerrado sensu stricto fragments of central-western Brazil BABT
Jardim,André Vitor Fleuri; Batalha,Marco Antônio.
The main selective forces affecting the fruiting strategies are related to the environment in which plants occur. As a savanna, microclimatic conditions should not vary in relation to distance from edge in cerrado sensu stricto fragments. Thus, we postulated that the importance of different dispersal syndromes would not vary towards the fragment core. Our aim was to test in four cerrado sensu stricto fragments in central Brazil whether the absolute density of anemo-, auto-, and zoochorous individuals varied in relation to edge distance. According to results, the absolute density of anemo-and autochorous individuals did not vary, whereas those of zoochorous individuals increased with edge distance, pointing out that there were other factors rather than...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Central-western Brazil; Cerrado; Dispersal; Edge effect.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000500014
Imagem não selecionada

Imprime registro no formato completo
Dispersion larvaire et cycle de vie dans les environnements hydrothermaux profonds : le cas de Rimicaris exoculata et d'espèces proches ArchiMer
Hernandez Avila, Ivan.
Deep-water hydrothermal vent host high-biomass communities based on chemoautotrophy supported by the metabolic activity of free-living and symbiotic bacteria associated to invertebrates, especially megafauna. Knowledge on the mechanisms of dispersal and the life cycle of vent species is essential to our understanding of the vent communities in terms of distribution, structure and temporal variation. In this study, I present some advances regarding the dispersal and life cycle of a dominant species of the Mid-Atlantic Ridge (MAR) vent ecosystems, the alvinocaridid shrimp Rimicaris exoculata, and other related species. The methodological approaches applied include morphological descriptions of larvae, analysis of population biology and reproduction, and...
Tipo: Text Palavras-chave: Sources hydrothermales profondes; Cycle de vie; Structure de population; Symbiose; Crevettes Alvinocarididae; Deep-water hydrothermal vents; Life cycle; Population structure; Reproduction; Dispersal; Symbiosis; Speciation.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00498/60927/64321.pdf
Imagem não selecionada

Imprime registro no formato completo
Distributional patterns and possible origin of leafhoppers (Homoptera, Cicadellidae) Zoologia
Nielson,Mervin W.; Knight,William J..
The zoogeographical distribution of 42 cicadellid subfamilies and their assigned tribes and genera is compiled with distributional maps and proposed dispersal pathways of genera that are shared interzoogeographically. Possible origin of the subfamilies and tribes is proposed in an ancestral context from which the more modern extant groups evolved whereas origin of genera is in a more modern context. Notwithstanding their complex biogeography, the distributional data of the higher groups indicate that all of the cosmopolitan and near cosmopolitan subfamilies arose during early Cretaceous or possibly the late Jurassic period (140-116 m.y.a.) when continental drift was in its early stages. Nearly all of the New World and some Old World subfamilies are...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leafhoppers; Cicadellidae; Distribution; Dispersal; Vicariance; Origin; Classificaton; Habitats.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000100010
Imagem não selecionada

Imprime registro no formato completo
Ecologie larvaire de l'huître perlière (Pinctada margaritifera, L.), croissance et dispersion dans un lagon d'atoll polynésien ArchiMer
Thomas, Yoann.
Understanding key factors determining the bentho-pelagic species larval growth and dispersal remains one of the challenges of marine ecology, notably to understand the adult population structure and dynamics. In the present study, we explore this determinism on the development and dispersal of the black-lip pearl oyster (Pinctada margaritifera var. cumingii, Linné 1758) larvae in a French Polynesian atoll lagoon (Ahe, Tuamotu archipelago). Rearing of the pearl oyster for the production of black pearls takes on a major social and economic place in French Polynesia. However, the supply of pearl oyster seed to the farms depends entirely on the natural collection of wild spat of the only one specie P. margaritifera, and spatial and temporal variability of spat...
Tipo: Text Palavras-chave: Ecologie larvaire; Hétérogénéité environnementale; Modélisation; Croissance; Dispersion; Huître perlière à lèvres noires; Pinctada margaritifera; Lagon d’atoll; Polynésie française; Larval ecology; Environmental heterogeneity; Modeling; Growth; Dispersal; Black-lip pearl oyster; Pinctada margaritifera; Atoll lagoon; French Polynesia.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00003/11449/7999.pdf
Imagem não selecionada

Imprime registro no formato completo
Effect of yolk utilization on the specific gravity of chokka squid (Loligo reynaudii) paralarvae: implications for dispersal on the Agulhas Bank, South Africa ArchiMer
Martins, Rodrigo S.; Roberts, Michael J.; Chang, Nicolette; Verley, Philippe; Moloney, Coleen L.; Vidal, Erica A. G..
Specific gravity is an important parameter in the dispersal of marine zooplankton, because the velocity of currents, and therefore the speed of transport, is usually greatest near the surface. For the South African chokka squid (Loligo reynaudii), recruitment is thought to be influenced by the successful transport of paralarvae from the spawning grounds to a food-rich feature known as the cold ridge some 100-200 km away. The role of paralarval specific gravity on such transport is investigated. Specific gravity ranged from 1.0373 to 1.0734 g cm(-3) during the yolk-utilization phase, implying that paralarvae are always negatively buoyant, regardless of yolk content. The data were incorporated into a coupled individual-based model (IBM)-Regional Ocean...
Tipo: Text Palavras-chave: Agulhas Bank; Chokka squid; Dispersal; Paralarvae; Specific gravity.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00013/12461/9316.pdf
Imagem não selecionada

Imprime registro no formato completo
Effects of stocking density on dispersal behavior of Brazilian freshwater dourado (Salminus brasiliensis) in a subtropical river headwater Neotropical Ichthyology
Schulz,Uwe Horst; Leal,Mateus Evangelista.
Juvenile freshwater dourados (Salminus brasiliensis Cuvier) were stocked in two batches of different size (61 and 133 individuals) with a time lag of 41 days in the headwaters of the Sinos River. A subsample of 25 fish was radio-tagged. Released juveniles displayed a density dependent dispersal pattern. During the first ten days mean covered distance of tagged batch 1 individuals (low density) was approximately 24 m d-1, while batch 2 individuals (high density) moved 296 m d-1. Activity of batch 1 fish increased after the release of batch 2 and remained high (459 m d-1) until 90 days. Activity of batch 2 fish during this period was in same range. After this period, activity levels of both batches decreased to about 60 m d-1. Increased movements in higher...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Density dependence; Dispersal; Intraspecific competition; Movements.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200016
Imagem não selecionada

Imprime registro no formato completo
Estimating dispersal and gene flow in the neotropical freshwater turtle Hydromedusa maximiliani (Chelidae) by combining ecological and genetic methods Genet. Mol. Biol.
Souza,Franco L.; Cunha,Anderson F.; Oliveira,Marcos A.; Pereira,Gonçalo A.G.; Reis,Sérgio F. dos.
Hydromedusa maximiliani is a vulnerable neotropical freshwater turtle endemic to mountainous regions of the Atlantic rainforest in southeastern Brazil. Random amplified polymorphic DNA (RAPD) was used to estimate the gene flow and dispersal for individuals inhabiting rivers and streams within a drainage. Nine primers generated 27 scoreable bands, of which 9 (33%) were polymorphic and produced 12 RAPD phenotypes. The gene flow estimates (Nm) among turtles inhabiting different rivers and streams were variable, ranging from 0.09 to 3.00 (mean: 0.60). For some loci, the rates of gene flow could offset population differentiation (Nm > 1), whereas for others random genetic drift could result in population divergence (Nm < 1). Since the genetic variation of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydromedusa maximiliani; Dispersal; Gene flow; Conservation.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000200007
Imagem não selecionada

Imprime registro no formato completo
Extension of the geographical distribution of some brachyuran and porcellanid decapods (Crustacea) to the coast of the State of São Paulo, Brazil Zoologia
Alves,Douglas F. R.; Cobo,Valter J.; Melo,Gustavo A. S. de.
Investigations of the distribution of marine organisms provide a better understanding of the patterns of distribution and dispersal of these animals. Extensions of the distributional limits of decapod crustaceans in Brazilian waters have been recorded steadily and gradually, but these limits still remain poorly understood. The present study provides information extending the known range of eight species of brachyuran crabs and one species of porcellanid crab. The animals were obtained by Scuba diving during a sampling program carried out near Vitória Island, Ilhabela, on the northeastern coast of the State of São Paulo (23º44'04"S-45º01'35"W) between February, 2004 and January, 2005. These new records extend the geographical distributions of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ballast water; Brachyura; Dispersal; New record; Porcellanidae.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000400045
Registros recuperados: 59
Primeira ... 123 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional