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Registros recuperados: 113
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Do seedling functional groups reflect ecological strategies of woody plant species in Caatinga? Acta Botanica
Menezes,Tatiane Gomes Calaça; Rodal,Maria Jesus Nogueira; Lima,André Luiz Alves de; Lima,Lucivania Rodrigues; Pinto,Monalisa Alves Diniz S. C.; Melo,André Laurênio de.
ABSTRACT It is assumed that morphological traits of seedlings reflect different strategies in response to environmental conditions. The ecological significance of this has been widely documented in rainforests, where habitat structure and species interactions play an important role in community assembly. However, in seasonally dry ecosystems, where environmental filtering is expected to strongly influence community structure, this relationship is poorly understood. We investigated this relationship between functional groups of seedlings and life history traits and tested whether functional group predicts the ecological strategies employed by woody species to deal with the stressful conditions in seasonally dry ecosystems. Seedling functional groups, life...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dry forest; Environmental filtering; Functional traits; Initial establishment; Recruitment; Seasonality.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100020
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Temporal changes in species composition, diversity, and woody vegetation structure of savannas in the Cerrado-Amazon transition zone Acta Botanica
Maracahipes-Santos,Leonardo; Santos,Josias Oliveira dos; Reis,Simone Matias; Lenza,Eddie.
ABSTRACT Vegetation in the transition between tropical forest and savanna is hyperdynamic and there is evidence that in the absence of fire, forest advances over savanna. Between 2008 and 2013 we evaluated changes in species composition and diversity and in the structure of the woody vegetation of savanna physiognomies in the transition between the Cerrado and Amazon biomes that were fire free for 11 years. The physiognomies form a gradient from savanna woodland (Typical Cerrado - TC), to low woodland (Dense Cerrado - DC), to woodland (locally called Cerradão - CO). We hypothesise that: 1) the more open physiognomies (TC and DC) are more dynamic compared to the closed physiognomy (CO); and 2) in the absence of fire vegetation tends to become more forested....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alternative stable states; Biodiversity; Brazilian savanna; Conservation; Mortality; Recruitment.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200254
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Spatial patterns of two co-occurring savanna and forest tree species in a dense fire-protected savanna fragment Acta Botanica
Costa,Rafael Carvalho da; Santos,Flavio Antonio Maës dos.
ABSTRACT Savanna-forest transition under fire-exclusion could be explained by differential competitive performance of savanna and forest species under shading/fire-exclusion. Aiming to understand strategies related to either habitat affinity, we investigated spatial patterns of a savanna and a forest species in a fire-protected savanna. We predicted that: savanna species would have lower abundance than the forest species due to a restriction in the number of open microsites; segregation of size classes and a trend from clumping to regularity with size for forest species due to absence of microsite limitation and intra-specifc competition; and spatial association and increasing clustering with size for savanna species due to microsite limitation. To test...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Competition; Fire; Microsite limitation; Recruitment; SADIE; Savanna; Spatial patterns.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000400577
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Demographic structure of a threatened palm (Euterpe edulis Mart.) in a fragmented landscape of Atlantic Forest in northeastern Brazil Acta Botanica
Melito,Melina Oliveira; Faria,José Cláudio; Amorim,André Márcio; Cazetta,Eliana.
At the northern limits of the range of the palm species Euterpe edulis there is an endemic ecotype, known as the "Bahia" ecotype, which is distinguished by its reddish crownshaft and low seed production. Unfortunately, little is known about its demographic characteristics. Therefore, we contrasted the density of E. edulis populations in the Una region, in the southern part of the Bahia state, Brazil, with that of other populations of the species in southern and southeastern Brazil. In addition, within the Una region, we compared a long-protected forest fragment (F1) with three recently protected fragments (F2, F3, and F4), in terms of demographic parameters and plant size, in order to determine what influence, if any, time since protection has on E. edulis...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Juçara palm heart; Forest fragment; Life stages; Recruitment; Population structure.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200011
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Woody vegetation dynamics in a floodplain campo de murundus in central Brazil Acta Botanica
Pinto,José Roberto Rodrigues; Mews,Henrique Augusto; Jancoski,Halina Soares; Marimon,Beatriz Schwantes; Bomfim,Bárbara de Oliveira.
Campos de murundus (grasslands dotted with knolls that are covered with savanna-like woody vegetation) are a common landscape in central Brazil. In this study, we assessed for the first time the dynamics of the vegetation in a floodplain campo de murundus, describing changes in composition and structure of the woody vegetation. In 2005, we established 16 permanent 25 × 25 m plots, where we identified and mapped individuals with a trunk diameter at the base ≥ 2.86 cm, as well as measuring the height of those individuals. In 2008 (after two fire events), we resampled the plots. In 2005, we had registered 4.54 m² ha-1 of basal area, 430 individuals, 42 species, 36 genera and 24 families. In 2008, we found an increase in basal area (to 4.65 m² ha-1) and a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Earth mounds; Fire; Mortality; Recruitment; Savanna.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400005
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Seed germination ecophysiology of the wild pineapple, Ananas ananassoides (Baker) L.B.Sm. (Bromeliaceae) Acta Botanica
Silveira,Fernando Augusto Oliveira; Santos,Jean Carlos; Fernandes,Geraldo Wilson.
In this study we investigated the effects of light, temperature, and storage on seed germination of the wild pineapple Ananasananassoides, an understorey species found in cerrado woodlands. Seeds were germinated at temperatures of 15, 20, 25, 30 and 35 ºC and a 12-hr photoperiod and continuous darkness for 30-d. Seeds were photoblastic and the optimum temperatures for germination were 25 and 30 ºC. Seeds stored for 12-mo at room temperature and at 4 ºC were set to germinate at optimum conditions. Germinability of stored seeds did not differ from that of recently collected seeds, regardless of storage temperature, indicating their physiological potential for seed bank formation. Our results suggest that as in tropical rainforests, light may be an important...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Photoblastism; Recruitment; Seed bank; Seed storage.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000400026
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Structural and compositional shifts in Cerrado fragments in up to 11 years monitoring Biological Sciences
Cordeiro, Natielle Gomes; Pereira, Kelly Marianne Guimarães; Terra, Marcela de Castro Nunes Santos; Mello, José Márcio de.
The Cerrado has a wide diversity of fauna and flora, and the knowledge of its horizontal structure, in different time intervals allows the prediction of its structural and floristic characteristics. The aim of this study was to evaluate the changes in structure and composition of tree community in three fragments of Cerrado with low anthropization, in an interval of 11 years at Minas Gerais state. Rectangular plots of fixed size were sampled, measuring stem diameter and height of all living arboreal individuals with diameter at 1.30 meters above ground (DBH) ≥ 5 cm. The tree vegetation dynamics study of the areas was performed, as well as the floristic analysis and the diametric structure. Considering all fragments and years of measurement, the recruitment...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tree community dynamics; Diversity; Ingrowth; Recruitment; Similarity; Vegetation. tree community dynamics; Diversity; Ingrowth; Recruitment; Similarity; Vegetation..
Ano: 2020 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/48357
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Estrutura espacial e deposição de sementes de Hymenaea courbaril L. em um fragmento florestal no sudoeste goiano - doi: 10.4025/actascibiolsci.v33i1.5881 Biological Sciences
Lima-Ribeiro, Matheus Souza; Universidade Federal de Goias; Rezende, Sueisla Lopes; UFG; Bernasol, Wilson Pereira; UFG.
O objetivo do presente trabalho é identificar e descrever o padrão de distribuição espacial de Hymenaea courbaril L. (Fabaceae) e os fatores condicionantes em um fragmento florestal, denominado Mata do Açude, município de Jataí Estado de Goiás. O procedimento adotado para coleta dos dados espaciais foi o método da distância conhecido como T – Square, utilizado para duas classes de tamanho: jovens e adultos, com circunferência de caule inferior e superior a 15 cm, respectivamente. Os fatores condicionantes analisados foram o padrão espacial de deposição das sementes e as características do substrato (solo e serrapilheira). A estrutura espacial da população foi identificada pelo teste de Hines (ht), a qual apresentou distribuição agregada, tanto para...
Tipo: Estrutura espacial Palavras-chave: Ciencias Biologicas; Ecologia; Ecologia Aplicada método T – square; Mata de galeria; Distribuição agregada; Recrutamento T - square method; Gallery forest; Aggregated distribution; Recruitment.
Ano: 2011 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5881
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Ferns influence on the woody species seedling bank in semi-deciduous forest, Southern Brazil Biological Sciences
Carvalho, Eloisa de Souza; Pimenta, José Antonio; Bianchini, Edmilson.
Different species of plants can act as environmental filters affecting the composition, structure and spatial distribution of seeds and seedlings of forest species. This study aimed to examine whether the presence of the fern stratum acts as a biotic environmental filter on the woody species seedling bank in a semi-deciduous forest remnant (Atlantic biome), Southern Brazil. Two experiments were developed in areas with ferns (F) and ferns-free (NF): a) richness and abundance of woody seedling bank were determined in 10 plots (25 m2) in each area; b) seedlings abundance of Actinostemon concolor (Spreng.) Müll. Arg., Aspidosperma polyneuron Müll. Arg., Euterpe edulis Mart., Guarea kunthiana A. Juss. and Inga marginata Kunth were monitored for a year in three...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic forest; Environmental filter; Mortality; Recruitment; Regeneration Botânica; Ecologia terrestre.
Ano: 2016 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31135
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Reproductive phenology of the American Bullfrog in subtropical Brazil: photoperiod as a main determinant of seasonal activity Anais da ABC (AABC)
MEDEIROS,CAMILA I.; BOTH,CAMILA; KAEFER,IGOR L.; CECHIN,SONIA Z..
ABSTRACT The North American bullfrog Lithobates catesbeianus continues to invade ecosystems worldwide, potentially causing population declines and even extinctions. Within its native distribution, bullfrogs show prolonged reproductive seasons and high fertility. However, data on breeding biology of bullfrogs ex-situ in invaded localities mainly comes from anecdotal reports. Understanding how invasive species are adjusting their life histories to new colonized environments is important for conservation purposes. Here we describe temporal and spatial abundance, calling activity, spawning and tadpole distribution of bullfrogs in southern Brazil. Eighteen samplings occurred during one year. The abundance of individuals was positively related to longer...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding; Invasive species; Lithobates catesbeianus; Microhabitat; Recruitment; Spatial distribution.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501909
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Population and reproductive traits of a freshwater amphipod (Crustacea, Peracarida, Hyalellidae) from northwest of the state of Rio Grande do Sul, Brazil Biota Neotropica
Castiglioni,Daniela da Silva; Limberger,Marcio; Castro,Vanessa da Silva; Ubessi,Francieli.
Abstract The study of population and reproductive traits provides information about the ecological structure of natural populations. This study aimed to characterize dynamics and reproductive traits of Hyalella palmeirensis from a natural pond from southern Brazil. The amphipods were sampled monthly (August 2012 to July 2013) by a person with the aid of a hand net for 20 minutes. Ovigerous females and pre-copulatory pairs were individualized in the field. A total of 12,325 individuals were sampled, being 1,421 males, 6,983 females (including 215 ovigerous females) and 3,921 juveniles. Paired and unpaired males were significantly greater in size than females. There was a positive correlation between body size (CL) of paired males and females. Males and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fecundity; Body size; Hyalella palmeirensis; Sex ratio; Reproduction; Recruitment.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000200204
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Spatial heterogeneity and its influence on Copaifera langsdorffii Desf. (Caesalpiniaceae) BABT
Resende,Júlio Carlos França; Klink,Carlos Augusto; Schiavini,Ivan.
Population dynamics and structure of young individuals of the tree Copaifera langsdorffii Desf. (Caesalpiniaceae) were studied in the gallery forest of the Panga Ecological Station, Uberlândia, MG, Brazil. Three distinct habitats were recognized in this forest, Dike, Middle and Edge zone. Four annual surveys of plant height, diameter at plant base and density were made between 1993 and 1996. The species showed an aggregated distribution in all three habitats. Population structure in all four surveys presented the typical reversed "J" form, characteristic of populations in local regeneration. For the whole population, mortality rates during the four years were constant and low (average of 4.8 % per year), while recruitment declined during the same period...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gallery forest; Seedling; Recruitment; Mortality; Growth; Saplings.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000300012
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Epibenthic colonization on an artificial reef in a stressed environment off the north coast of the Rio de Janeiro State, Brazil BABT
Krohling,Werther; Zalmon,Ilana Rosental.
The influence of sedimentation and turbidity caused by the pluviometric precipitation and by the Paraiba do Sul River during the summer was investigated on an artificial reef along the north coast of Rio de Janeiro, Brazil. Four recruitment and four cumulative plates were removed monthly (January 2002 to February 2003) from the external surface of the concrete reef modules. Empty space was not a limiting factor the recruitment. Turnover rate and structural difference index were higher in the first months and reflected low change in the species dominance during almost the entire study period. The high correlation between the precipitation and the empty space suggested that rain influence the recruitment and the succession. The recruitment was possible...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Recruitment; Succession; Benthic community structure; Natural disturbance.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100025
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The role of pre-recruitment processes in the maintenance of a barnacle (Chthamalus challengeri Hoek) patch on an intertidal pebble shore in Japan BJB
APOLINÁRIO,M..
To understand the role of pre-recruitment processes (supply of larvae and recruitment) in the maintenance of an intertidal barnacle (Chthamalus challengeri Hoek) patch, the availability of cyprid larvae and the recruitment on natural pebble substrata was monitored on the Magarisaki pebble shore (Amakusa, Kyushu, Japan) during 1995 and 1996. Also, a hypothesis that predation and/or bulldozing by mobile intertidal mollusks during the post-recruitment period could be an important factor in mortality of these barnacles was tested. The collapse of the adult population and the consequent disappearance of the patch were observed by the middle of 1995. The larval availability was low (<FONT FACE="Symbol">@</FONT> 6 cyprid larvae/100 l), as was the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Barnacles; Chthamalus challengeri; Larval supply; Recruitment; Japan.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200007
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Demographic response to the manipulation of adult females in corn mouse populations Ecología austral
Gómez,María D; Steinmann,Andrea R; Priotto,José W.
Variation in population abundance is a consequence of changes in demographic parameters such as survival and recruitment. These demographic parameters can be affected by intraspecific competition, thus adults may play an important role infl uencing the survival and/or reproduction of juvenile individuals in many species of small mammals. We present an analysis of Calomys musculinus populations using capturemark- recapture models in order to evaluate the effect of female removal on their demography. The study was carried out in four enclosures during two different periods: a reference period and a treatment period, with the removal of adult females. Reference period was analyzed to describe population demography without manipulations. In treatment period,...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Adult female removal; Calomys musculinus; Population growth; Recruitment; Survival.
Ano: 2012 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2012000200005
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Reproductive biology of the swimming crab Achelous spinimanus (Decapoda, Portunoidea): a potential fishing resource Iheringia, Sér. Zool.
Sousa,Aline N.; Bernardes,Veronica P.; Bernardo,Camila H.; Taddei,Fabiano G.; Teixeira,Gustavo M.; Costa,Rogério C.; Fransozo,Adilson.
ABSTRACT This study describes the reproductive and recruitment patterns of the swimming crab Achelous spinimanus (Latreille, 1819) in the Ubatuba region of the northern coast of São Paulo, Brazil. Crabs were captured monthly from January 1998 to December 1999 in 18 sites located in three bays (Ubatumirim, Ubatuba, and Mar Virado), using a commercial fishing boat. In each sampling area, bottom temperature, salinity, and organic matter content were recorded. A total of 1,911 individuals were captured: 350 adult males, 475 non-ovigerous adult females, 584 adult ovigerous females, and 502 immature individuals. Reproductive females were more abundant in deeper areas; this migration might be a strategy to improve larval dispersion and survival. Ovigerous females...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fishing; Organic matter; Recruitment; Temperature; Ubatuba.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100210
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Reproduction and growth of the deep-sea brittlestar ophiura-ljungmani (lyman) ArchiMer
Tyler, Pa; Gage, Jd.
Reproductive biology and population dynamics of Ophiura Ijungmani were studied by measuring disk diameters and by examining oocyte size-frequencies and fecundity from a sequential seasonal series of large samples from a 2900 m deep Permanent Station in the Rockall Trough (Northeast Atlantic). Egg size (max. 90 !lm) and fecundity (up to 57000 eggs per individual) suggests indirect planktotrophic development, while a clear annual cycle in gametogenesis, with probably synchronous spawning in JanuaryFebruary, confirms a marked seasonality that is also seen as an annual, summertime set of postlarvae on to the bottom. Analysis of size structure of the population indicates annually discrete year classes with a maximum longevitv of around 10 years. lndividuals...
Tipo: Text Palavras-chave: Ovocytes; Fécondité; Structure de la répartition des classes de tailles; Recrutement; Capacité de survie; Oocytes; Fecundity; Population structure; Recruitment; Survivorship.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/00323/43424/43087.pdf
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Hazard warning: model misuse ahead ArchiMer
Dickey-collas, Mark; Payne, Mark R.; Trenkel, Verena M.; Nash, Richard D. M..
The use of modelling approaches in marine science, and in particular fisheries science, is explored. We highlight that the choice of model used for an analysis should account for the question being posed or the context of the management problem. We examine a model-classification scheme based on Richard Levins' 1966 work suggesting that models can only achieve two of three desirable model attributes: realism, precision, and generality. Model creation, therefore, requires trading-off of one of these attributes in favour of the other two: however, this is often in conflict with the desires of end-users (i.e. mangers or policy developers). The combination of attributes leads to models that are considered to have empirical, mechanistic, or analytical...
Tipo: Text Palavras-chave: Climate; Fisheries; GAM; Management; Prediction; Projection; Recruitment; Time-series analysis.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00222/33371/32179.pdf
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Genetic impact of the reproduction dynamics in the European flat oyster Ostrea edulis ArchiMer
Lapegue, Sylvie; Taris, Nicolas; Lallias, Delphine; Bonhomme, Francois; Boudry, Pierre.
The European flat oyster (Ostrea edulis L.) is a marine bivalve whose natural geographical distribution ranges along the European Atlantic coast from Norway to Morocco, in addition to the Mediterranean and Black Sea. The latest results obtained on the genetic differentiation between these populations have led us to persue studies at a finer scale, in order to estimate the effective number of breeders and the temporal dynamics of reproduction and, more specially, recruitment. Several experiments were performed to document (1) the variance in allele frequencies during a natural settlement period, (2) the paternal contribution to fertilization by analyzing larvae sampled at the brooding stage within individual females, (3) the variance of individual...
Tipo: Text Palavras-chave: Recruitment; Microsatellite markers; Ostrea edulis; European flat oyster; Genetic.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/acte-3485.pdf
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Recruitment of the Pacific oyster Crassostrea gigas in a shellfish-exploited Mediterranean lagoon: discovery, driving factors and a favorable environmental window ArchiMer
Lagarde, Franck; Roque D'Orbcastel, Emmanuelle; Ubertini, Martin; Mortreux, Serge; Bernard, Ismael; Fiandrino, Annie; Chiantella, Claude; Bec, Beatrice; Roques, Cecile; Bonnet, Delphine; Miron, Gilles; Richard, Marion; Pouvreau, Stephane; Lett, Christophe.
In the context of increasing demand for environmental recovery, aquatic systems may face the challenge of evolving under oligotrophication. This is the case in Mediterranean lagoons, in particular the shellfish-farmed Thau lagoon in France, where we studied recruitment of the Pacific oyster Crassostrea gigas. Oyster spat and environmental parameters were monitored at several sampling sites for 3 yr (2012 to 2014) using an original method with a temporal overlap deployment of collectors to study pre- and post-settlement processes and to identify the best conditions for recruitment. Contrary to the ‘no Pacific oyster reproduction’ paradigm in Mediterranean lagoons, our study showed that recruitment of this introduced species is possible in the Thau lagoon at...
Tipo: Text Palavras-chave: Crassostrea gigas; Oyster spat; Pediveliger; Metamorphosis; Recruitment; Oligo trophication; Larval ecology.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00398/50899/51672.pdf
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