Abstract
Maintaining and restoring ecological connectivity is considered a global
imperative to help reverse the decline of biodiversity. To be
successful, practitioners need to be guided by connectivity modeling
research that is rigorous and reliable for the task at hand. However,
the methods and workflows within this rapidly growing field are diverse
and few have been rigorously scrutinized. We propose three procedural
steps that should be consistently undertaken and reported on in
connectivity modeling studies in order to improve rigour and utility:
(1) describe the type of connectivity being modeled, (2) assess the
uncertainty and sensitivity of model parameters, and (3) validate the
model outputs, ideally with independent data. We reviewed the literature
to determine the extent to which studies included these three steps. We
focused on studies that generated novel landscape connectivity outputs
using circuit theory. Among 181 studies meeting our search criteria,
39% communicated the type of connectivity being modeled and 18%
conducted some form of sensitivity or uncertainty analysis (or both).
Only 19% of studies attempted to validate their connectivity model
outputs and only 7% used fully independent data. Our findings highlight
a clear need and opportunity to improve the rigour, reliability, and
utility of connectivity modeling research. At a minimum, researchers
should be transparent about which, if any, of these three steps were
undertaken. This will help practitioners make more informed decisions
and ensure limited resources for connectivity conservation and
restoration are allocated appropriately.