Please only answer if you have read the research paper called “Temporal variability (1997-2015) of trophic fish guilds and its relationships with El

Please only answer if you have read the research paper called “Temporal variability (1997-2015) of trophic fish guilds and its relationships with El Ni~no events in a subtropical estuary”
What goals/questions are addressed by this study (ie, what is/are the key uncertainties motivating the study)?
What significant issues (new key uncertainties) does this study identify for future
research? [2]