[1] Univ Buenos Aires, Fac Ciencias Vet, CONICET, Inst Invest Prod Anim,INPA,UBA, Ave Chorroarin 280,C1427CWO, Buenos Aires, DF, Argentina
[2] Univ Autonoma Metropolitana, Dept Hidrobiol, Mexico City, DF, Mexico
[3] Univ Fed Alagoas, Setor Ecol Conservacao, Inst Ciencias Biol & Saude ICBS, Maceio, Alagoas, Brazil
[4] Univ Oviedo, Dept Phys, Oviedo, Spain