Resumen de LLuvia polínica en selvas montanas de la provincia de Tucumán, Argentina
Pollen rain in mountain forests of Tucumán Province, Argentina. This study is referred towater dynamics in the mountain forests of Tucumán Province, (Argentina) started in 2002 at the Instituto deEcologia of the Fundación Miguel Lillo. The place selected was the Toma del Río Horqueta, Reserva de LaFlorida (Dept. Monteros) over 1300m.s.l. A pluviometer, considered as a device similar to a captator Tauber, wasused 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 inorder to ascertain the content of pollen rain in the mountain forests. More than 50 taxa were identified showingthe natural vegetation of the area. A pollen calendar was elaborated with these data. Two periods of significantpollen contribution were observed. The first period, in September, showed different pollen types among wichthe following arboreal species predominated: Alnus acuminatus, Juglans australis, Polylepis australis, Prunustucumanensis, Parapiptadenia excelsa, Celtis sp. and Myrtaceae. The second period, in December, wascharacterized by a high percentage of Ulmaceae. A third period, although less important was also observed inApril, with the dominance of Asteraceae. Other species appeared in small quantities according to their time ofblossom.
