BRYOPHYTA ON LAPACHO ROSADO (Handroanthus impetiginosus (Mart. ex DC.) Mattos) FROM SAN MIGUEL DE TUCUMAN.

TORRES J. R; SCHIAVONE M. M; SUAREZ G. M

San Miguel de Tucumán

Jornada; THIRD JOINT MEETING OF THE BIOLOGY SOCIETIES OF ARGENTINA; 2015

Sociedades de Biología de la República Argentina

The aim of this work was to determine the presence and abundance of Bryophyta (mosses and liverworts) present in Lapachos(Handroanthus impetiginosus (Mart. ex DC.) Mattos) in San Miguel de Tucuman. Samples were taken from 15 trees with DAP 25-50cm, along to a transect of 600m made in Mate de Luna street, between 0-1m (base, b) and 1-2m (upper part , u); the spatial orientationof the communities was also registered (North- South). Then the samples were analyzed through conventional techniques for bryophytes and abundance was estimated using the Ecological SignificanceI Index (IES), whose values were between 0-600. Sevenspecies of mosses were found, the prevalent ones being: Syntrichia fragilis (IES=296 b; 246 u), Dimerodontium balansae (IES=240 b;220 u), Erpodium glaziovii (IES=220 b; 113 u) and Fabronia ciliaris (IES=180 b; 258 u), while Erpodium beccarii was poorlyrepresented (IES=77 b; 27 u). The exclusive species to a zone of the tree are: Bryum sp (IES=33 b) and Entodon suberythropus(IES=13 u). Foliose liverworts were also observed in both zones of the tree (IES=200 b; 164 u). Most communities grew southerly (60%), followed by those oriented northerly (35%) and with both orientations (5%). We can conclude that the site has little diversity,there being 57% of acrocarpic species and 43% of pleurocarpic ones. These species are typical of disturbed environmenst. There areno significant differences between the diversity and abundance (ISE) of species from base and the upper part of the trees. As to spatialorientation, the communities tend to grow toward the opposite side of the street, probably as a safeguard against gasses released bycars