Resumen de Depositación polínica anual en el Parque Nacional Pre-Delta, Entre Ríos, Argentina
Fabiana Latorre, Marta Caccavari
Annual pollen deposition in the Pre-Delta National Park (Entre Ríos, Argentina). Thiswork aims to analyze the seasonal pattern and the diversity of the Pre-Delta National Park vegetation (EntreRíos, Argentina) as reflected by the deposited pollen along a year. Pollen has been monitored monthly withTauber traps over one year (since August 2004 to July 2005). The pollen traps were placed in two sub environmentswithin the park: 1) in a tallgrass prairie (P), and 2) in a shrubland next to a forest (A). The high diversity wasdetermined by 83 pollen types (72 in P and 65 in A), but only 3 in P and 5 in A reached more than 5% of thepollen total. Asteraceae Asteroideae (non Ambrosia, non Artemisia), Poaceae and Salix were the most abundant,being related to the Tessaria and Salix forests, and to the prairies of Panicum. In A, the Prosopis pollen (typicaltaxon of the Espinal vegetation) was also important, as well as the Solanum glaucophyllum pollen type (taxon ofthe wetland). The deposited annual pollen value was 15186 pollen/cm2 in P and 11552 pollen/cm2 in A. A noticeableseasonal difference was observed between P (the maximum in January and February) and A (maximum inOctober) due to the flowering of dominant taxa: Poaceae and Asteraceae Asteroideae, respectively. The minimumwas registered in July in both sites. In conclusion the plant diversity of the park is represented in both sites, butthe seasonal flowering period differs according to the main vegetation sources.
