I am interested in valuation methods (directly an indirectly) to reveal and estimate the economic values bio-diversity for a Biosphere reserve area.
I have tried CVM and other value stated methods but the results are not relevant and reliable. The problem is that the biosphere is housing an iconic otter which, apparently is not so well known for normal visitors.
I would appreciate if respondents could provide some literature also.
Thank you for your time reading my question