Abstract

TORRES, Gonzalo R; PEREZ, Claudio F; LUPO, Liliana C  and  MARTINEZ, Olga G. Registro preliminar del depósito atmosférico anual de esporas de helechos de las yungas sobre un gradiente ambiental en la cuenca media del río Perico (Jujuy, Argentina). Bol. Soc. Argent. Bot. [online]. 2014, vol.49, n.4, pp.503-512. ISSN 1851-2372.

Preliminary record of annual atmospheric deposit of fern spores from the Yungas over an environmental gradient in the middle basin of rio Perico (Jujuy, Argentina). The aim of this work was to record the fern spores biological richness, to analyze their relative representation as well as their annual atmospheric deposit rate present in aerobiological traps, on a gradient transition in the Montane Forest of Yungas from Northwest Argentina (1900 m-2600 m a.s.l.). On the altitudinal transect, 5 Tauber traps were placed during a whole year (august 2011-august 2012). A Principal Component Analysis (PCA) was performed to determine the spore assemblages for each altitudinal level. The record includes 11 spore types (Adiantum sp., Anemia sp., Asplenium sp., Cheilanthes squamosa, Microgramma squamulosa, Pecluma sp., Polystichum sp., Pteridaceae indeterminate, Pteris exigua, Pteris deflexa, Pteris inermis) that partially reflect the local flora of the forest understory. Ferns represent 31% of the total species recorded (both pollen and fern spores), while their relative contribution to the total accumulation rate (4567, 7 propagules cm-2 year-1), was 6.17% (275.3 spores cm-2 year-1). The PCA allowed recognizing the spore's associations for each altitudinal level. The study contributes with preliminary deposit rates of fern spores, achieving advances in the knowledge of their aerobiological characteristics. This expands the knowledge of the current environment and serves as reference information for paleoenvironmental studies of the region. The study provides preliminary data on the rate of deposition of fern spores of the Yungas, making progress in the knowledge of the plant group, scarcely known from the aerobiological point of view.

Keywords : Deposit rate; Spores of ferns; Yungas; Rio Perico.

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