title: Suitability of Tillandsia usneoides and Aechmea fasciata for biomonitoring toxic elements under tropical seasonal climate.
abstract: Aechmea fasciata was evaluated for the first time as a biomonitor of toxic elements, in comparison to the biomonitoring capacity of Tillandsia usneoides, a well-established biomonitor bromeliad species. Plants of both species were exposed to air pollutants from industrial, urban, and agricultural sources, under the tropical seasonal climate, from June/2011 to April/2013, in five sites of São Paulo State, Brazil, for 8 consecutive exposure periods of 12 weeks each. The levels of essential and non-essential elements, including trace metals, were quantified at the end of each exposure. T. usneoides and A. fasciata indicated N, Fe, Zn, Co, Cr, and V as air contaminants in the studied sites, during wet and dry seasons and both species were recommended for qualitative biomonitoring. Concentration levels of N, Ca, S, Fe, Zn, Cu, B, Co, and Ni were significantly higher in T. usneoides than in A. fasciata. However, A. fasciata showed a higher effective retention capacity of Ni, Pb, V, Cu, Fe, Cr, and Co during field exposure, as indicated by the estimate of enrichment factor relative to basal concentrations. This species is more suitable for detecting the atmospheric pollution level of those metals than the T. usneoides. Both species indicated adequately the seasonal differences in the pollution levels of several elements, but T. usneoides presented higher ability for biomonitoring the spatial variations and for indicating more properly the sources of each element in the studied region than the A. fasciata.
authors: Instituto de Botânica, P.O. Box 68041, 01061-970 São Paulo, SP, Brazil. Electronic address: patpaoli83@gmail.com.
authors: Patricia
authors: P
authors: Giampaoli
authors: Multidisciplinary Institute of Plant Biology, National University of Córdoba, Vélez Sarsfield Avenue 1611, X5016CGA Córdoba, Argentina. Electronic address: ewannaz@com.uncor.edu.
authors: Eduardo D
authors: ED
authors: Wannaz
authors: Instituto de Botânica, P.O. Box 68041, 01061-970 São Paulo, SP, Brazil. Electronic address: atavares2005@yahoo.com.br.
authors: Armando R
authors: AR
authors: Tavares
authors: Instituto de Botânica, P.O. Box 68041, 01061-970 São Paulo, SP, Brazil. Electronic address: mmingos@superig.com.br.
authors: Marisa
authors: M
authors: Domingos
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000378:metabolism*; D001938:Brazil; D031229:Bromeliaceae / Q000378:metabolism*; D004784:Environmental Monitoring / Q000379:methods*; D007221:Industry; D008670:Metals / Q000032:analysis / Q000378:metabolism; D012621:Seasons; D031232:Tillandsia / Q000378:metabolism*; D014131:Trace Elements / Q000378:metabolism; D014329:Tropical Climate
chemical_list: D000393:Air Pollutants; D008670:Metals; D014131:Trace Elements
keywords: Atmospheric pollution; Epiphytic bromeliads; Trace metals