Abstract
Pollen rain in mountain forests of Tucuman Province, Argentina. This study is referred to water dynamics in the mountain forests of Tucuman Province, (Argentina) started in 2002 at the Instituto de Ecologia of the Fundacion Miguel Lillo. The place selected was the Toma del Rio Horqueta, Reserva de La Florida (Dept. Monteros) over 1300m.s.l. A pluviometer, considered as a device similar to a captator Tauber, was used in order to measure water accumulated twice, or sometimes once a month. Water gathered during a year (July 2004 - June 2005) was centrifugated and its sediment was processed according to conventional methods in order to ascertain the content of pollen rain in the mountain forests. More than 50 taxa were identified showing the natural vegetation of the area. A pollen calendar was elaborated with these data. Two periods of significant pollen contribution were observed. The first period, in September, showed different pollen types among wich the following arboreal species predominated: Alnus acuminatus, Juglans australis, Polylepis australis, Prunus tucumanensis, Parapiptadenia excelsa, Celtis sp. and Myrtaceae. The second period, in December, was characterized by a high percentage of Ulmaceae. A third period, although less important was also observed in April, with the dominance of Asteraceae. Other species appeared in small quantities according to their time of blossom.
Highlights
El registro de las variaciones fenológicas de la floración y la detección de las preferencias alimentarias de las abejas son de gran utilidad en el manejo de los colmenares de una región, puesto que permiten detectar la disponibilidad de recursos y los cambios en el flujo de néctar y polen a las colonias
Las observaciones a campo del comportamiento de Apis mellifera sobre las especies seleccionadas concuerdan en líneas generales con los resultados obtenidos en el análisis melisopalinológico realizado en el área considerada (Forcone et al, 2005); aunque, algunas especies categorizadas «a» o «b» estuvieron escasamente representadas en la miel, este hecho se atribuye a las tempranas floraciones de algunos taxa
Pollen collected by honey bees (Apis mellifera L.) from south of Caldén district (Argentina): botanical origin and protein content
Summary
El área estudiada se ubica en los Dptos. Futaleufú y Cushamen de la Provincia del Chubut (42° - 43° S y 71° O), se halla comprendida fitogeográficamente en los bosques subantárticos y ecotono entre éstos y la Provincia Patagónica (Cabrera, 1971). Presenta un total aproximado de 2500 colmenas en producción, concentradas en dos sectores, el extremo noroeste, donde se hallan las localidades de Epuyen, Lago Puelo y El Hoyo, y el sector sur donde se encuentran emplazadas las localidades de Trevelin y Esquel (Fig. 1). Revista del Museo Argentino de Ciencias Naturales, n. Plantas muy visitadas: con registro de visitas en más del 70% de las observaciones. B. Plantas visitadas: con registro de visitas en 50 a 70% de las observaciones. C. Plantas ocasionalmente visitadas: con registro de visitas en menos del 50% de las observaciones.
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