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Large spill of mining wastes in Portelo stream: impacts on ecosystem integrity and on angling potential
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Orientador(es)
Resumo(s)
Streams located at Montesinho Natural Park (NE Portugal) have high potential for
brown trout (Salmo trutta) angling . However, in this territory there are severa! abandoned mine
sites. Therefore, the continuous drainage of fine grained tailings can be particularly problematic
due to arsenic, copper, aluminium and zinc. However, until now no significant disturbance was
detected in water quality and in biota. Nevertheless, there has never been such a large spill of
mining wastes as that occurred in January 201 O. As a consequence of intense precipitation,
severa! millions of cubic meters of wastes were spilled into Portelo stream. The large amount of
wastes covered the riverbed with a layer of mud reaching more than half a meter in areas close to
the mine. Both riparian and agricultura! areas were also affected by the sediments from mine.
Wastes were spilled downstream by severa! strong rain events. Thus, the objective of the present
research was to evaluate the impact of this event on ecosystem integrity and ultimately on angling
potential. To achieve the proposed objective the water from four sampling points along the
affected stream was sampled for the following metais - AI , Mn, Co, Cu , Ni, Cd and As.
Concomitantly, macroinvertebrate and fish assemblages were also assessed. Temporal
differences between stations were not detected. On contrary spatial differences were found. As
expected, the stations located near the mine showed the highest leveis of contamination and
disturbance. Consequently, in these stations no macroinvertebrates and fish were found during
the period of study.
Descrição
Palavras-chave
Mine spilling Macroinvertebrates Headwater stream Ecosystem integrity Angling potential
Contexto Educativo
Citação
Geraldes, Ana Maria; Ramalhosa, Elsa; Caetano, Miguel; Teixeira, Amílcar (2013). Large spill of mining wastes in Portelo stream: Impacts on ecosystem integrity and on angling potential. In 7º Congresso Florestal Nacional. Bragança: Sociedade Portuguesa de Ciências Florestais. p. 173-183. ISBN 978-972-99656-2-3
Editora
Sociedade Portuguesa de Ciências Florestais