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Registros recuperados: 51
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Ontogeny, allometry and architecture of Psychotria tenuinervis (Rubiaceae) Acta Botanica
Rosseto,Vanessa; Carneiro,Magda Silva; Ramos,Flavio Nunes; Santos,Flavio Antonio Maës dos.
We evaluated the ontogeny of the understory shrub Psychotria tenuinervis Müll.Arg., considering morphological and morphometric characters. Four ontogenetic stages were identified: seedling, juvenile, immature and adult (vegetative and reproductive phases). Size measurements and allometric relationships of the stem and crown were compared between the immature and adult stages. Diameter and total height of the stem, as well as crown depth and width, increased throughout the ontogenetic stages and differed among immature, vegetative adult and reproductive adult individuals. The number of branches was lower in immature individuals than in vegetative and reproductive adult individuals but did not differ between the last two. The bifurcation ratio did not vary...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometry; Architecture; Branching pattern; Ontogenetic stages; Understory.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400012
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Size-dependent allocation of biomass to ancillary versus flowers of the inflorescences of the epiphyte Tillandsia stricta Soland (Bromeliaceae) Acta Botanica
Mantovani,André; Iglesias,Ricardo Rios.
The amount of resources invested in reproduction is closely correlated to plant size. However, the increase in reproductive investment is not always proportional to the increase in vegetative growth, as the proportion of plant resources allocated to reproduction can increase, decrease or be maintained along different plant sizes. Although comprising thousand of species, epiphytes are poorly studied in relation to reproductive allocation (RA). We describe the variation in the RA of the epiphytic bromeliad Tillandsia stricta Soland with increasing plant sizes. Our goal is not only to evaluate the RA of the whole inflorescence but also quantify the contribution of ancillary structures in the final RA of this plant species. With increasing sizes of T. stricta...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allocation; Allometry; Ancillary structures; Bromeliaceae; Tillandsia.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000100016
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Ontogenetic shape changes and sexual dimorphism in Aegla marginata Bond-Buckup and Buckup, 1994 Anais da ABC (AABC)
ADAM,CAROLINA L.; MAROCHI,MURILO Z.; MASUNARI,SETUKO.
ABSTRACT A study on relative growth, sexual dimorphism and ontogenetic trajectory was carried out in a population of the aeglidAegla marginata coming from Barrinha River, Iguape River Basin, Tunas do Paraná, Paraná State, Brazil. The size the of morphological sexual maturity was estimated for males and females. The analysis of sexual dimorphism and ontogenetic trajectory were performed using geometric morphometric technique. Males reach maturity with 10.58 mm of carapace length (CL) and females with 10.38 mm CL. Sexual size dimorphism was only visible among adults, with males reaching larger sizes. This is probably related to the reproductive strategy of males. However, sexual shape dimorphism was found for both juveniles and adults: the posterior region...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometry; Relative growth; Sexual dimorphism; Shape.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401521
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Population structure of Rudgea parquioides (Rubiaceae), a shade-tolerant shrub species, in Southern Brazil Anais da ABC (AABC)
Cardoso,Fernanda C.G.; Salvalaggio,Ana P.B.; Marques,Márcia C.M..
The expectations that shade-tolerant forest species show 1) a population structure composed by a high amount of small individuals, and 2) biomass allocation for diameter higher than for height growth, were tested for Rudgea parquioides, a typical shrub in Southern Brazil. We described the size structure (height and stem diameter) and allometrical relations of a R. parquioides population by counting and measuring all the individuals in a 725m² area in the municipality of Curitiba (25"25'S; 49"19'W). A total of 916 individuals (12,634 ind.ha-1) were recorded in the area. The firstexpectation was supported, since distribution by height and diameter classes showed a predominance of small individuals (skewness coefficients > 1). On the other hand, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometry; Araucaria forest; Size distribution; Subtropical forest; Understorey.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300011
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Dendrometry and litterfall of neotropical pioneer and early secondary tree species Biota Neotropica
Benvenuti-Ferreira,Glaci; Coelho,Geraldo Ceni; Schirmer,Jorge; Lucchese,Osório Antônio.
The increased forest cover loss in the tropical and subtropical regions has stimulated the development of restoration methods through tree plantations. Based on the successional model of forest development the use of different successional groups can be seen as a strategy to accelerate the re-composition of forests and an attempt to recover ecological conditions prior to disturbance. Tree species have particular growth rates and ecological needs, and this knowledge is important in the development of high diversity models of forest restoration. The objective of this study was to compare the initial growth and litterfall of native pioneer versus early secondary tree species in a mixed plantation system, and to determine the relationships between guilds and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Restoration ecology; Secondary succession; Allometry; Successional guilds.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000100008
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Reproduction and growth in a Neotropical arboreal mouse: Oecomys rutilus (Sigmodontinae: Cricetidae) in French Guiana Biota Neotropica
Catzeflis,François.
Abstract: Postnatal growth and development of the small Neotropical mouse Oecomys rutilus (Sigmodontinae: Cricetidae) were investigated from birth to day 143, in the laboratory. Morphometric measurements at age of 3 days, of both sexes combined, revealed body weight to be 3.4 ± 0.3 g, mean tail length as 27.4 ± 1.1 mm, and mean hind foot length as 9.3 ± 0.7 mm. Body weight was found to increase steadily until at least 69 days, whereas the instantaneous growth rates of other measurements declined earlier: the daily growth of hind foot length declined to a minimum at age of 24 days, and the growth of tail and of ear declined by the age of 33 days. Average litter size for 12 captive births was 2.5, ranging from 2 to 3. The preserved eye crystalline lens was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometry; Gompertz model; Rodents; Eye-lens weight; Life history.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200207
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Length-weight and length-length relationships for rockpool fishes on the Brazilian coast Biota Neotropica
Machado,Fabiola Seabra; Oliveira,Rory Romero de Sena; Silva,Arianderson Texeira; Giarrizzo,Tommaso.
Abstract Fifty-nine length-weight (LWR) and length-length (LLR) relationships were estimated for 18 fish species, belonging to 10 families. The fish specimens were captured in rockpools of 21 sites along a stretch of 4,900 km of the Brazilian coast, between latitudes 00° and 22°S, in 2012. This study represents the first reference available for five fish species (Gobiesox barbatulus, Bathygobius geminatus, Labrisomus nuchipinnis, Malacoctenus delalandii, Lutjanus alexandrei) in LLR and six (Gobiesox barbatulus, Bathygobius geminatus, Hypleurochilus fissicornis, Omobranchus punctatus, Entomacrodus vomerinus, Diplodus argenteus) in LWR.
Tipo: Info:eu-repo/semantics/other Palavras-chave: Intertidal fish; Tidepool; Allometry.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000300502
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Allometric models for estimating the phytomass of a secondary Atlantic Forest area of southeastern Brazil Biota Neotropica
Burger,Déborah Moreira; Delitti,Welington Braz Carvalho.
The purpose of this study was to develop and validate equations to estimate the aboveground phytomass of a 30 years old plot of Atlantic Forest. In two plots of 100 m², a total of 82 trees were cut down at ground level. For each tree, height and diameter were measured. Leaves and woody material were separated in order to determine their fresh weights in field conditions. Samples of each fraction were oven dried at 80 °C to constant weight to determine their dry weight. Tree data were divided into two random samples. One sample was used for the development of the regression equations, and the other for validation. The models were developed using single linear regression analysis, where the dependent variable was the dry mass, and the independent variables...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass; Allometry; Carbon; Secondary Atlantic Forest; Forest biomass estimation.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000400012
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Studies on the morphometry of Macrobrachium nobilii (Decapoda, Palaemonidae) BABT
Mariappan,Pitchaimuthu; Balasundaram,Chellam.
Fourteen morphometric characters of Macrobrachium nobilii (Henderson and Matthai, 1910), a freshwater prawn were measured from 72 males and 66 females collected at random in field. The growth constant (b) of total length and weight for male (4.28) and female (3.02) differed significantly (P<0.05). Comparison of slopes and elevations of regressions between sexes indicated significant difference in all the studied dependent parameters with carapace length (X), except with carapace width (Y). In males, major and minor chelipeds showed positive allometry while in females the growth was isometric.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometry; Cheliped freshwater prawn length-weight Macrobrachium nobili.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300015
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Influence of planting methods on root development, crop productivity and water use efficiency in maize hybrids Chilean J. Agric. Res.
B. Khan,Muhammad; Yousaf,Farhan; Hussain,Mubshar; W. Haq,Muhammad; Lee,Dong-J; Farooq,Muhammad.
Optimum planting methods better ensure water and nutrient supply through improved root development resulting in better crop growth and productivity. This study was conducted to evaluate the effects of planting methods on root development, crop allometry, water use efficiency (WUE), productivity and economic returns of different maize (Zea mays L.) hybrids. Maize hybrids NK-6621, Pioneer-30Y87, and Pioneer-30Y58 were sown on beds, ridges, and flat surface. Ridge sowing was better followed by bed sowing; while amongst the hybrids, 'Pioneer-30Y87' performed the best. Well-developed root system, with longer primary root, more number of lateral roots and higher root growth rate, was observed in 'Pioneer-30Y87' planted on ridges, which led to higher WUE, grain...
Tipo: Journal article Palavras-chave: Allometry; Planting methods; Root growth rate; Water use efficiency.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400015
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Allometric growth of non-carcass components in crossed lambs Ciência Rural
Garcia,Iraides Ferreira Furusho; Alvarenga,Tharcilla Isabella Rodrigues Costa; Perez,Juan Ramon Olalquiaga; Almeida,Amelia Katiane de; Gallo,Sarita Bonagurio; Pereira,Idalmo Garcia; Alves,Nadja Gomes; Alvarenga,Flávio Augusto Pereira.
Males and females, including purebred Santa Inês lamb (SI) and crosses between Santa Inês dams and Texel (TxSI), Ile de France (IFxSI) and Bergamasca (BxSI) sires were feedlot finished and slaughtered at 15, 25, 35 and 45kg live weight. After slaughter, the following non- carcass components were weighed and calculated the allometric growth. Lungs of BxSI males grew faster than those of SI and TxSI. Trachea/esophagus in SI and TxSI males grew slower than IFxSI and BxSI. Kidneys BxSI males grew faster than TxSI and IFxSI. Livers of female TxSI lamb grew more rapidly than those of females in the other genetic groups. In both males and females, the rumen/reticulum grew faster in the TxSI group than SI and BxSI groups.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometry; Growth; Crossbreed; Body development; Sheep.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000701229
Registros recuperados: 51
Primeira ... 123 ... Última
 

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