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| Salaya Domínguez, José Manuel. |
| Se compara el desarrollo de progenies de Pinus patula Schiede ex Schltdl. et Cham.de seis años de edad con diferentes niveles de mejora genética en dos sitios en ambientes contrastantes: Aquixtla, Puebla a 2,930 m (S1) y Acaxochitlán, Hidalgo a 2,260 m (S2). Primero se evaluaron 36 familias mejoradas en Colombia y Sudáfrica (grupo M) y de 36 nativas (grupo Selectas, S). A los 6 años, la supervivencia fue de 72.7% en S1 y 90% en S2. Las progenies del grupo M fueron estadísticamente superiores en el volumen del tronco en S1 (4.3 vs. 3.6 dm3), mientras que no lo fueron en S2 (10.7 vs. 13.5 dm3). En S1, las heredabilidades (h2i) para las características de crecimiento (altura, diámetro y volumen) variaron de 0.09 a 0.12, mientras que en el S2 de 0.26 a 0.35.... |
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Palavras-chave: Pinus patula; Progenies; Familias; Parámetros genéticos; Diagnóstico nutricional; Fenología; Patrón de crecimiento; Grados-día; Forestal; Doctorado; Families; Genetic parameters; Nutritional diagnosis; Phenology; Growth pattern; Degree days. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1810 |
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| Freitas,Tiago Magalhães da Silva; Montag,Luciano Fogaça de Assis. |
| ABSTRACT A field study of the sex ratio, length-weight ratio, body size at first gonadal maturation, and the breeding season of the red-tailed catfish, Phractocephalus hemioliopterus, was carried out in the region of the middle Xingu River in the eastern Amazon basin. The fish were sampled quarterly from September 2012 to January 2014 using gillnets and long lines. The sex ratio was balanced, and while males and females were similar in standard length, the females were heavier than the males, on average. The males presented negative allometric growth, and the females, isometric growth. The estimated size at first maturity was 77.8 cm. The variation in the gonadosomatic index and the greater frequencies of mature specimens indicated a reproductive peak at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon basin; Breeding season; Fishery; Gonadal maturity; Growth pattern. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000200216 |
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| OLIVEIRA,Marcos Sidney Brito; SILVA,Luís Maurício Abdon; PRESTES,Luiza; TAVARES-DIAS,Marcos. |
| ABSTRACT Length and weight data are useful in fisheries management and standard results of fish monitoring programs. Length-weight relationship (LWR) is used for estimating the weight corresponding to a given length, and the condition factor is used to compare the body condition, fatness or health of fish populations. This study aimed to estimate the LWR and the condition factor for 12 freshwater fish species from the Igarapé Fortaleza basin, a tributary of the Amazonas River system in the State of Amapá, eastern Amazon (Brazil). The coefficient of determination, the allometric condition factor and the allometric coefficient varied among species, and were compared with populations elsewhere. In 83.3% of the species, the allometric coefficient remained... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Allometry; Brazil; Freshwater fish; Growth pattern. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000100008 |
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| FREITAS¹*,Tiago Magalhães da Silva; SOUZA¹,Joao Batista de Souza e; PRUDENTE²,Bruno da Silveira; MONTAG²,Luciano Fogaça de Assis. |
| ABSTRACT Studies on the length-weight relationship (LWR) of fishes are an important tool to describe several biological aspects of the species. Consequently, these studies are relevant due the necessity of comprehension about fish life cycle. Thus, this study aimed to establish the length-weight relationship of the ten most common fish in the Lower Nhamundá River, left tributary of the Amazon River. The capture of fish was conducted in January 2008 using gill nets. A total of 807 individuals, ten species and three Orders (Characiformes, Siluriformes and Clupeiformes) were analyzed. The parameter b varied from 2.680 to 3.698. The LWR were shown for the first time for two species: Anostomoides laticeps and Ageneiosus polystictus. Finally, this research... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Growth pattern; Alometry; Fish; Amazonia. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000100075 |
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| ARIMORO,FRANCIS O; MEYE,JACOB A. |
| Preliminary investigation into some aspects of the biology of the palaemonid prawn, Macrobrachium dux (Lenz, 1910) in River Orogodo at Abavo, southern Nigeria was carried out between March and August 1995. The freshwater prawns were collected with properly baited cage traps and scooping with hand basket. The study revealed that the prawn species were widespread and abundant in the river. Abundance in terms of number and biomass was more during the wet season with a peak in August. Both adults and juveniles showed a progressive increase from late dry season to midrainy season (August). The malefemale ratio was 1:1.2. The fluctuation in the number and percentage of ovigerous females indicated that the prawn spawned during the midrainy season (JuneAugust).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth pattern; Gravid; Condition factor; River Orogodo; Nigeria. |
| Ano: 2007 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2007000200009 |
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