| trophic interactions of the endangered southern river otter (lontra provocax) in a chilean ramsar wetland inferred from prey sampling, fecal analysis, and stable isotopes. | non-invasive methodological approaches are highly recommended and commonly used to study the feeding ecology of elusive and threatened mammals. in this study, we use multiple lines of evidence to assess the feeding strategies of the endangered southern river otter, by determining seasonal prey availability (electrofishing), analysis of undigested prey remains (spraints), and the use of stable isotopes (δ(15)n and δ(13)c) in otter spraints (n = 262) and prey in a wetland ecosystem of southern chi ... | 2013 | 23467968 |