Examinando por Materia "Fenología"

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    Arthropods associated with Callisthene fasciculata (Vochysiaceae) canopy in the Pantanal of Mato Grosso, Brazil.
    (Universidad del Valle, 2020-07-09) Yamazaki, Lúcia; Vindica, Vanessa França; Isaac Marques, Marinêz; Battirola, Leandro Dênis; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    Studies on arthropods associated with tropical rainforest canopies contribute to a further understanding of forest canopy community dynamics and their relationship to the structure and function of this ecosystem. This study evaluated arthropod community composition in monodominant Callisthene fasciculata forest canopy throughout the high water and dry periods in the northern region of the Pantanal in Mato Grosso, Brazil, as a part of a project about arboreal canopy arthropods associated with monodominant areas in this region. Sampling was conducted on 12 individuals of C. fasciculata, six from the high-water season (2010) and six from the dry season (2011), using insecticide fogging. A total of 28,197 arthropods were collected. Hymenoptera (the majority being Formicidae), Diptera, Acari, Thysanoptera, Hemiptera and Coleoptera, were the most representative groups. Although the analysis did not show variation in the abundance of individuals between the high water and dry seasons, the arthropod community varied significantly in taxa composition. Opiliones, Embioptera, Ephemeroptera and Scorpiones occurred only during the high-water period, with Polyxenida and Strepsiptera occurring only in the dry season. Thysanoptera was more abundant in the dry season, showing a relationship with the beginning of the C. fasciculata flowering period. In general, the high water and dry seasons maintain distinct communities in this habitat, illustrating how the temporal variation in the phenology of C. fasciculata imposed by the Pantanal’s hydrological regime alters the composition of the associated arthropod communities in the canopy of these monodominant formations in the Pantanal of Mato Grosso.
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    PublicaciónAcceso abierto
    Fenología de ericaceae (cavendishia adenophora, disterigma cryptocalyx Y Sphyrospermum cordifolium) en Colombia.
    (Universidad del Valle, 2013) Villa Castaño, María Angélica; Silverstone Sopkin, Philip Arthur; Giraldo Gensini, Manuel Enrique
    El comportamiento fenológico vegetativo y reproductivo de Cavendishia adenophora, Disterigma cryptocalyx y Sphyrospermum cordifolium (Ericaceae) fue observado entre febrero de 2012 y febrero de 2013 en un bosque nublado del costado oriental de la Cordillera Occidental colombiana. Se pretendía establecer los patrones fenológicos y sincronía en estas especies, as´¿ como la influencia de la precipitación. Las tres especies estudiadas tuvieron una actividad foliar continua y sus individuos son sincrónicos, pero no hubo presencia de un patrón ni estacionalidad. En cuanto a la fenología reproductiva, tanto D. cryptocalyx como S. cordifolium florecieron todo el a¿no y no presentaron patrón fenológico. D. cryptocalyx no fructificó durante el periodo de estudio, mientras que la fructificación en S. cordifolium fue continua. C. adenophora presentó descansos de floración y fructificación y un máximo de inflorescencias en diciembre y de infrutescencias en febrero. De las tres especies, solamente C. adenophora presentó asincronía, lo que concuerda con lo encontrado por otros autores en estudios fenológicos en bosques tropicales. Que no se presente de un patrón fenológico quizá se deba al enmascaramiento que la neblina causa sobre la estacionalidad de la precipitación manteniendo una humedad constante que conllevaría a una continuidad de las características fenológicas. Se propone además que el cubrimiento del bosque por neblina podría repercutir en la Cantidad de radiación solar recibida por las plantas, por lo cual, estas podrían tener como estrategia la producción continua de hojas, aumentando la superficie foliar y así, captar la máxima radiación solar.
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    PublicaciónAcceso abierto
    Population fluctuation of thrips (Frankliniella cf. gardeniae) in mango crops in Tolima, Colombia.
    (Universidad del Valle, 2018-12-31) Sierra Baquero, Paola Vanessa; Varón Devia, Edgar Herney; Gomes Días, Lucimar; Jaramillo Barrios, Camilo Ignacio; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    Mango is one of the tropical fruits with the highest production worldwide; in Colombia is a crop with a great export potential. However, insect pests such as thrips, can affect its quality and production. In this research the relationship of the population fluctuation of thrips (Frankliniella cf. gardeniae) with climatic conditions and mango (var. Yulima and Tommy) phenology in Guamo and San Luis (Tolima) was evaluated. Trips were weekly sampled in both inflorescences and young leaves of mango and associated weeds; phenological stages of the crop and climatic conditions (temperature, relative humidity and precipitation) were recorded and the probability of the presence of thrips in mango flowers was determined. A total number of 8.609 thrips individuals, including adults and immatures, were collected. The population fluctuation of Frankliniella cf. gardeniae presented a positive relationship with flowering (R = 0.79 var. Yulima and Tommy) and temperature (R = 0.43 var. Yulima; R = 0.48 var. Tommy). It was recorded the genera of the phytophagous trips Frankliniella and Haplothrips, in the weeds Desmodium tortuosum and Melochia parvifolia. The flowers and fruits up to 8 mm size were the most susceptible to insect attack. Finally, the higher probability of the thrips presence in mango flowers had two main periods, 7-63 days and 161-163 days after flowering. Frankliniella cf. gardeniae behaved as an occasional pest, present when the food source was available and the climatic conditions were adequate.