Abstract
Pollen gathering by Apis mellifera (Hymenoptera) in the lower Delta of the Parana River: bee behavior and pollen diversity. A melissopalinologycal analysis of Apis mellifera corbicular pollen loads was made in order to determine pollen origin and main pollen sources throughout the bee foraging season in the Delta of the Parana River. This analysis was based on 37 samples from the 1993-1994 beekeeping season. Bees gathered corbicular loads from about 20% of the available species throughout the season, but only 3% of these species were intensely used. The most abundant pollen grains belonged to Asteraceae, Leguminosae, Myrtaceae, Brassicaceae and Salicaceae. The pollen species varied throughout the sampling period. Nutritious quality was generally high. Anemophilous pollen types were harvested when the environmental offer dropped. Cultivated and exotic species heavily contributed at the end of winter and in spring, while native species were preferentially gathered in summer and autumn. The behavior of foraging bees was polylectic, with high pollen diversity in the corbicular loads and plasticity in use of local elements, and selective for the preferential use of lipidic -more energetic- pollen grains.
Highlights
El poien es la principal fuente de proleinas con que cuenta Apis mellifera
Los dias de lluvia determinaron bruscas oscilaciones en l a cantidad y en la diversidad de polen cosechado, por ejemplo en las cosechas del 5 de noviembre, 28 de enero y 25 de marzo
A Wodehouse,R.P. 1935.Pullengrains.Mc Graw HillXook Company, New York London, 574 pp
Summary
Localizaci6n del &rea de estudio La cosecha dci polen acarreado por las abejas se realizd en el colmenar de la Estacidn Experimenta! Agropecuaria Delta del Parana Localizaci6n del &rea de estudio La cosecha dci polen acarreado por las abejas se realizd en el colmenar de la Estacidn Experimenta! Las muestras de polen analizadas provienen de 4 colmenas, seleccionadas a1 azar dentro del late del colmenar. Se obtuvieron 50 muestras, distribuidas irregnlarmcnte a lo largo de la temporada, en funci6n de las restricciones impuestas par las condiciones climaticas y por otros ensayos en eurso. Las cargas recoleetadas en cada trampa fueron pesadas, luego se unific la muestra de cada focha y se submuestrearon 10 gramos de la misma para su analisis microsc6pico. Enalynas muestras de dificil disgregacibn (contaminadas con propoleos tambibn retenidos en la trampa de polen), se utilizd un agitador por ultrasonido durante 10 minntos, que permiti disgregar las Basdao: Cosecha de polen por Apcs mellzfera v P ; s x -.-A"*. Las presencia de pollenkitt fue registrada en preparados de referencia sin acetolizar montados se&n tecnicas de Wodehonse (1935)
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