Plankton characterization of alpine ponds: a case of study for the assessment of water quality in Serra da Estrela (Portugal)F.S. Martins, A. Moutinho, J. Espinha Marques, N. Formigo and S.C. AntunesAnn. Limnol. - Int. J. Lim., 56 (2020) 4DOI: https://doi.org/10.1051/limn/2020001