1390-8596 1390-8596 S1390-85962017000200045 10.17163/lgr.n25.2017.04 Ecuador Ecuador Ecuador 00 08 2017 00 08 2017 25 1 45 52

2002 2013 2002 2009 FAO 2013 2008 2009 2008 2009 2003 2009 1997