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Registros recuperados: 33
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Ajustamento de modelos não-lineares a dados de crescimento de suínos. Repositório Alice
FREITAS, A. R.; COSTA, C. N..
1983
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Modelos logístico; Gompertz; Bertalanfly; Curvas de crescimento; Growth curves; Logistic model; Gompertz model; Bertalanffy model.
Ano: 1983 URL: http://www.alice.cnptia.embrapa.br/handle/doc/43218
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Ajuste de modelos não lineares em bovinos de corte I. Padrão de crescimento da populacão. Repositório Alice
FREITAS, R. de F.; ALENCAR, M. M. de; SILVA, A.M..
Tres modelos nao lineares de crescimento: Gompertz, Logistico e Von Bertalanffy, foram ajustados pelo metodo de Gauss Newton a dados peso-idade, do nascimento ate 40 meses de idade, de bovinos da raca Canchim, machos e femeas, nascidos de 1953 a 1975, em Sao Carlos, SP. O objetivo foi estudar o padrao de crescimento de animais Canchim no seu ambiente de origem e discutir caracteristicas destes modelos, para coeficientes de determinacao superiores a 98,0%, exceto o Gompertz que nao convergiu para machos, os demais proporcionaram boa qualidade de ajuste aos pesos observados, para ambos os sexos.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Curvas de crescimento; Modelos Von Bertalanffy; Gompertz; Logistico; Growth curves; Logistic.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/44181
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Ajuste de modelos não lineares em bovinos de corte II. Influência do mês de nascimento. Repositório Alice
FREITAS, A. R. de; ALENCAR, M. M. de; SILVA, A. M..
Os modelos Gompertz, Logistico e Von Bertalanffy foram ajustados pelo metodo de Gauss Newton a dados peso-idade, do nascimento ate 40 meses de idade, de animais da raca Canchim (femeas e machos). O objetivo foi avaliar a influencia do mes de nascimento (MN) sobre o padrao de nascimento desses animais ate a idade adulta por meio da associacao entre a taxa de crescimento e o peso limite (A). Os modelos proporcionaram coeficientes de determinacao superiores a 98,0%, embora o gompertz nao tenha apresentado convergencia em alguns do MN. O modelo de Von Bertalanffy proporcionou os maiores valores para as estimativas de A e, consequentemente, os menores valores de K. O MN apresentou grande influencia sobre parametros de crescimento dos modelos para ambos os sexos.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Curvas de crescimento; Modelos de Gompertz; Bertalanffy e Logistico; Peso assintotico; Asymptotic weight; Growth curves; Growth rate; Logistic; Von Bertalanffy.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/44203
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Algunos aspectos de la biología pesquera del langostino (Pleoticus muelleri)de la Bahía Blanca y un análisis del desembarco comercial del período 1955-1979 OceanDocs
Bertuche, D.A.; Wyngaard, J.G..
This study was carried out in order to get somme knowledge on the characteristics of the fisheries of the shrimp Pleoticus muelleri in the area of Bahia Blanca during 1980-1981. Monthly samplings in the fishing area were performed, and the landing data from 1955 to 1979 were analized.
Tipo: Journal Contribution Palavras-chave: Size distribution; Growth curves; Length-weight relationships; Landing statistics; Yield; Shrimp culture.
Ano: 1982 URL: http://hdl.handle.net/1834/2053
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Aplicación del método de máxima verosimilitud a la estimación de parámetros y comparación de curvas de crecimiento de von Bertalanffy. OceanDocs
Aubone, A.; Wöhler, O.C..
With the purpose of easening its application, the theory of parameter estimation by the maximum likelihood method is presented. The theory is general and useful for linear and nonlinear models. The method is applied to the von Bertalanffy´s growth model for individual data and for mean values of length-at-age. Statistical tests to compare parameters from different population groups are presented. Problems caused by lack of verification of assumptions are discussed. An example of its application is given and results of nonlinear least squares estimations are compared to those obtained with Allen´s method. An example of application implemented on a calculus spreadsheet is attached.
Tipo: Journal Contribution Palavras-chave: Growth curves; Mathematical models; Mathematical models; Http://aims.fao.org/aos/agrovoc/c_24199.
Ano: 2000 URL: http://hdl.handle.net/1834/2541
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Atlas demographique des populations de poissons d'eau douce d'Afrique AgEcon
Moreau, J.; Palomares, M.L.D.; Torres, F.S.B.; Pauly, Daniel.
Tipo: Report Palavras-chave: Freshwater fish; Population dynamics; Stock assessment; Growth curves; Catch/effort; Recruitment; Fishery biology; Africa; Resource /Energy Economics and Policy.
Ano: 1995 URL: http://purl.umn.edu/44838
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Avaliação de métodos de padronização dos pesos corporais às idades de 205, 365 e 550 dias. Repositório Alice
LOBO, R. N. B.; MARTINS FILHO, R..
Resumo: Foram comparados métodos de padronização dos pesos corporais às idades de 205, 365 e 550 dias. Utilizaram-se informações de animais da raça Nelore, criados na região Nordeste e controlados pela Associação Brasileira dos Criadores de Zebu (ABCZ). Compararam-se os métodos: METI - utilizado pela ABCZ; MET2 - curvas individuais de regressão linear para cada animal; MET3 - curvas individuais de regressão quadrática; MET4 - curvas individuais de Brody; MET5 - utilizado pelo Programa de Melhoramento Genético da Raça Nelore (PMGRN); e MET6 - curvas individuais de Richards. Houve diferenças entre as médias dos pesos corporais calculadas pelos diferentes métodos. Foram verificadas altas correlações entre os métodos. As estimativas de variâncias e de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Bovino de corte; Curva de crescimento; Método de padronização; Modelos não lineares; Peso corporal; Beef cattle; Body weights; Growth curves; Non linear models; Standardization methods.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/529428
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Biometrie et Croissance des Jeunes Crevettes Trachypenaeus de la Guadeloupe (Antilles Francaises). ArchiMer
The principal biometric relations of juvenile Trachypenaeus similis similis and T. constrictus in Guadeloupe were calculated from 1976 to 1978. The examination of these relations yields few differences between the two species. A growth curve was established according to the sequences of modal values; these were determined according to weekly size frequency distributions over three different periods of time. In the zone studied, the growth of young Trachypenaeus is more rapid than that of the young Penaeus.
Tipo: Text Palavras-chave: Trachypenaeus; Juveniles; Size distribution; Growth curves; Biometrics.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1932.pdf
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Características poblacionales de la anchoíta (Engraulis anchoita)del Mar Argentino. Parte I. El largo medio al primer año de vida, crecimiento y mortalidad OceanDocs
Hansen, J.E.; Cousseau, M.B.; Gru, D.L..
A total of 7263 otoliths were collected from anchovy samples taken during two pelagic cruises which were carried out in the Spring of 1978. An statistical analysis of back calculated length distributions of one-year-old fish (L1)was made. The L1 mean values taken by geographical latitude form a cline, with higher values in the northern samples, and decreasing Southwards. Within this latitudinal gradient two main anchovy populations can be identified, one in the region of Buenos Aires Province and the other in Patagonian waters. The L1 of the females is significatively larger than that of the males for the former population, whereas in the Patagonian area differences between sexes are not significant. The parameters of the von Bertalanffy Growth curves, as...
Tipo: Journal Contribution Palavras-chave: Stock identification; Otolith reading; Growth curves; Mortality; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1984 URL: http://hdl.handle.net/1834/2043
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Comparação de modelos matemáticos para o traçado de curvas granulométricas. Repositório Alice
SILVA, E.M. da; LIMA, J.E.F.W.; RODRIGUES, L.L.; AZEVEDO, J.A. de.
A distribuição granulométrica de partículas sólidas é essencial para as áreas de material de construção, mecânica dos solos, física dos solos, hidrossedimentologia, entre outras. As técnicas utilizadas na avaliação da distribuição granulométrica de amostras resultam em valores pontuais, dependendo de posterior interpolação para o traçado da curva granulométrica e a obtenção de diâmetros característicos específicos. A transformação de valores pontuais em funções contínuas pode ser realizada por meio de modelos matemáticos. Entretanto, há poucos estudos com a finalidade de determinar o melhor modelo para o ajuste de curvas granulométricas. O objetivo deste trabalho foi testar e comparar 14 diferentes modelos passíveis de utilização no traçado da curva...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Textura do solo; Granulometria; Regressão não linear; Curva de crescimento; Soil texture; Soil fractions; Non-linear regression; Growth curves.
Ano: 2004 URL: http://www.alice.cnptia.embrapa.br/handle/doc/110290
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Crecimiento de la merluza (Merluccius hubbsi) del Atlántico sudoccidental entre 1993-2003 al norte y sur de 41º S OceanDocs
Renzi, M.A.; Santos, B.A.; Abachian, V..
The reading of otoliths sagittae collected during the INIDEP (National Institute for Fisheries Research and Development, Argentina) assessment cruises carried out in the 1993-2003 period allowed to estimate length and weight growth parameters and the condition factor of hake (Merluccius hubbsi) and to prospect the two management units of the species north and south of 41ºS (Argentine Sea, SW Atlantic). A great variability in total length and weight in each age group was observed; nevertheless, stable mean length and weight values per age group were observed in the period analyzed. Besides, the values estimated to determine possible growth variations in each and between both management units north and south of 41ºS were compared. The comparison of growth...
Tipo: Journal Contribution Palavras-chave: Growth curves; Stock identification; Condition factor; Marine environment; Marine environment; Http://aims.fao.org/aos/agrovoc/c_4610.
Ano: 2009 URL: http://hdl.handle.net/1834/3458
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Crescimento de Callinectes danae Smith (Decapoda, Portunidae) da Lagoa da Conceição, Florianópolis, Santa Catarina, Brasil Zoologia
Branco,Joaquim Olinto; Masunari,Setuko.
Studies on the growth of the blue crab C. danae were carried out by the analysis of size-frequency distributions, and the growth curves were determined for both sexes through Bertalanffy equation. 613 males and 511 females were obtained from 10 collecting sites of the lagoon, at night, monthly from January/88 to July/89. The growth curves in carapace width were described according to the following equations: Wid∞ = 14.0 (1-e-0,6975.t) for males and Wid∞ = 13.3 (1-e-0,6555.t) for females. The growth curves in body weigth were also determined, based on the equations of the growth curves and the relationship between body weight and carapace width. The equations are:Wt = 156.9 (1-e-0,6975.t)2.9153 for males, Wt = 134.0(1-e-0.6555.t)2.8994 for females.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Callinectes danae; Growth curves; Conceição Lagoon; Florianópolis; Brazil.
Ano: 1992 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751992000100008
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Dedifferentation of leaf cells and growth pattern of caluses of Capsicum frutescens cv. Stromboli. Repositório Alice
SANTOS, M. R. A. dos; PAZ, E. S..
In vitro cell suspension cultivation systems have been largely reported as safe and standardized methods of production of secondary metabolites with medicinal and agricultural interest. Capsicum frutescensis one of the most widely grown vegetable in the world and its biological activities have been demonstrated against insects, fungi, bacteria and other groups of organisms. The objective of this study was to establish a protocol for dedifferentiation of leaf cells of the cultivar C. frutescens cv. Stromboli and to determine the growth pattern of the calluses with a focus on the deceleration phase, when the callus cells must be subcultured into a liquid medium in order to establish cell suspension cultivations aiming at the production of secondary...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Capsicum frutescens cv Stromboli; Célula foliar; Metabólicos secundários; Protocolo de diferenciação celular; Leaf cells; Callogenesis; Growth curves; Deceleration phase; Fase de desaceleração; Embrapa Rondônia; Porto Velho (RO); Rondônia; Amazônia Ocidental; Western Amazon; Cultura In Vitro; Calogênese; Curva de Crescimento; In vitro culture; Callus formation; Secondary metabolites; Cell dedifferentiation.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1127111
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Ecología trófica de la anchoíta (Engraulidae, Engraulis anchoita)del Mar Argentino. Parte III. Requerimiento trófico individual en relación con el crecimiento, ciclo sexual y las migraciones estacionales OceanDocs
Angelescu, V.A.; Anganuzzi, A..
The paper was developed in order to arrange the data gathered on this subject and to generate new hypotheses in connection with the trophic strategy of the northern stock of anchovy in the area between latitudes 35°-42°S. Such estimates were finally compared with the values of the gravimetric determinations of stomach contents- as converted to caloric values - of individuals grouped by total-length amd age classes, ecological areas, and seasons of the year. The set of results as obtained conforms the initial basis for developing Part IV of the Trophic Ecology of the Argentine anchovy as related to food consumption estimates, by stock biomass and annual classes, with back-calculations to age class 0, and for applying "regional patterns" that result from the...
Tipo: Journal Contribution Palavras-chave: Growth curves; Bioenergetics; Migrations; Length-weight relationships; Condition factor.
Ano: 1986 URL: http://hdl.handle.net/1834/2022
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Ecología trófica de la caballa del Mar Argentino (Scombridae, Scomber japonicus marplatensis). Parte I. Alimentación y crecimiento OceanDocs
Angelescu, V.A..
The present study describes the morphology of the digestive system, the feeding and feeding behaviour, and the trophic relationships of the mackerel in the coastal waters regions, pelagic zone, along the Province of Buenol Aires. At the same time, this study is completed with a bioestatistical analysis on growth rhythm of body length and body weight of secondary juveniles, pre-adults and adults. All the biological information and statistical data correspond, only to the period november-march and the summer trophic habitat area.
Tipo: Journal Contribution Palavras-chave: Trophic relationships; Ecological distribution; Digestive system; Feeding; Growth curves; Condition factor; Mackerel fisheries; Feeding; Digestive system; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_2275.
Ano: 1979 URL: http://hdl.handle.net/1834/2058
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El dorado, Salminus maxillosus (Pisces, Characiformes)en el Río de la Plata y Río Uruguay inferior OceanDocs
Sverlij, S.B.; Espinach Ros, A..
Catch per unit effort (CPUE), lenght distribution, age, growth, reproduction, migrations and feeding were studies through samples collected with longlines and a gang of gill-nets of several mesh size. CPUE data showed a progressive decrease of the relative abundance in the Río de la Plata, during the study period. Age was studied from scales. Back-calculations of growth revealed the pressence of Lee's phenomenon. Means lenghts at age were greater in females. No significant difference was found in lenght-weight regressions from both sexes and sampling areas. Only young individuals from 1 to 6 years were caught. None of the fish studied had ripening gonads. Extensive migrations were recorded both in the Paraná and Uruguay rivers. Stomach contents analysis...
Tipo: Journal Contribution Palavras-chave: Migrations; Catch/effort; Sex ratio; Size distribution; Scale reading; Growth curves; Reproduction; Stomach content; Sex ratio; Reproduction; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1986 URL: http://hdl.handle.net/1834/2032
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Estimación del crecimiento y mortalidad del chivo cabezón Ariopsis bonillai (Miles, 1945) (Pisces: Siluriformes: Ariidae), en la Ciénaga Grande de Santa Marta, Colombia OceanDocs
Galvis-Cortés, O.D..
A partir de septiembre de 1981 y durante 14 meses consecutivos de muestreo en la Ciénaga Grande de Santa Marta, se capturaron 3477 ejemplares de chivo cabezón Ariopsis bonillai (Miles, 1945). Con base en estas capturas, se estimó la relación tallapeso para hembras y machos en forma separada y en conjunto. Se obtuvieron las curvas de crecimiento según von Bertalanffy en talla y peso para ambos sexos y también los valores preliminares de las tasas de mortalidad natural (M), total (Z) y por pesca (F) Se analiza la variación de estos resultados entre sexos como una función causaefecto, originada por el fenómeno de la incubación oral característico en la especie.
Tipo: Journal Contribution Palavras-chave: Fish; Fishing; Growth curves; Size; Weight; Fish; Fishing; Size; Weight; Http://aims.fao.org/aos/agrovoc/c_15903; Http://aims.fao.org/aos/agrovoc/c_26950; Http://aims.fao.org/aos/agrovoc/c_7093; Http://aims.fao.org/aos/agrovoc/c_8349.
Ano: 1984 URL: http://hdl.handle.net/1834/4033
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Estructura poblacional del gatuzo (Mustelus shmitti) en la costa bonaerense y uruguaya asociada a condiciones oceanográficas. OceanDocs
Massa, A.M..
The gatuzo, Mustelus schmitti, lives in the Southamerican Atlantic coastal waters from up to 23°S (Brazil)down to 47°S (Argentine), and is the greatest species of the Bonaerense and North Patagonian shores. This species is the most exploited elasmobranch of this region, within the last six years catch has exceeded 10,000 t per year and it is vulnerable to overexploitation due to reproductive aspects, with a low rate of changes, as well as distribution patterns. In order to relate size distribution and nursery areas, and environmental temperature and salinity variability, were obtained within six INIDEP 'Coastal Project' research cruises from 34° to 42°S from boundaries to 50 mts isobaths, during the spring seasons between 1994 to 1997. Cluster analysis...
Tipo: Theses and Dissertations Palavras-chave: Size distribution; Age composition; Sex ratio; Growth curves; Environmental effects; Brackishwater environment; Age composition; Sex ratio; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_1050.
Ano: 1998 URL: http://hdl.handle.net/1834/3584
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Estudio de edad y crecimiento de la sardina fueguina (Sprattus fuegensis)de las costas de la provincia de Santa Cruz e Islas Malvinas OceanDocs
Cousseau, M.B.; Gru, D.L..
Samples of Sardina fueguina (Sprattus fuegensis)were taken during research cruises carried out in 1974 and 1978. Length and age frequency distributions were analyzed, and von Bertalanffy growth parameters were calculated for the coastal waters of two geographical regions: Province of Santa Cruz and northern part of Malvinas Islands. Lenght and weight growth curves have been calculated for each region and each year. Marked differences have been found between gowth parameters of both regions, and the calculated values showed a good fit with the observed ones. According to these results, it is possible to assume that the sardines of both regions constitute two different populations. However, more information on the total distribution of the species will have...
Tipo: Journal Contribution Palavras-chave: Age composition; Growth curves; Stock identification; Sardine fisheries; Age composition; Http://aims.fao.org/aos/agrovoc/c_29093.
Ano: 1982 URL: http://hdl.handle.net/1834/2052
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Estudios sobre la edad y crecimiento de la Palma Calamus brachysomus (Lockington) (Pisces: Sparidae) en aguas ecuatorianas OceanDocs
Martínez, J..
342 specimens of sparid Calamus brachysomus ”Palma”, collected during a demersal trawl survey by the R. V. Tohallí in April and May1983, were examined. The different techniques used to prepare scales and otoliths for ageing are described and analysed. The otoliths were determined to be the most reliable for ageing studies; 87% of otoliths were readable. The rings observed were assumed to be annual. The mean lengths at age were used to determine the parameters of the Von Bertalanffy growth formula, giving: Lt=50.13(1-e-0.1473(t+2.0704)). The growth curve obtained must be considered provisional due to possible biases in the interpretation of the otoliths, and also due to those arising from the selectivity of the fishing gear.
Tipo: Journal Contribution Palavras-chave: Demersal fisheries; Age; Growth; Growth curves; Otoliths; Otolith reading; Demersal fisheries; Growth; Otoliths; Age; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_186.
Ano: 1985 URL: http://hdl.handle.net/1834/3226
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