%0 Journal Article
%A St-Louis, V.
%A Forester, J.D.
%A Pelletier, D.
%A Belisle, M.
%A Desrochers, A.
%A Rayfield, B.
%A Wulder, M.A.
%A Cardille, J.A.
%T Circuit theory emphasizes the importance of edge-crossing decisions in dispersal-scale movements of a forest passerine
%B Landscape Ecology
%D 2014
%V 29
%P 831-841
%N 5
%X Measuring landscape connectivity in ways that reflect an animal’s
propensity or reluctance to move across a given landscape is key
for planning effective conservation strategies. Resistance distance,
based on circuit theory, is one such measure relevant for modeling
how broad-scale animal movements over long time periods may lead
to gene flow across the landscape. Despite the success of circuit
theory in landscape genetic studies, its applicability to model finer-scale
processes such as the movement patterns of individual animals within
their breeding grounds (e.g., while prospecting for territories)
has yet to be tested. Here, we applied both circuit models and least-cost
models to understand the relationship between landscape connectivity
and return time of Ovenbirds (Seiurus aurocapilla) that had been
translocated at least 20 km from their home territory near Québec
City, Canada. Using an iterative optimization process, we derived
resistance values for three cover types (forest, edge, and open)
that resulted in resistance distance values that best explained Ovenbird
return times. We also identified the cover-type resistance values
that yielded length of least-cost path estimates that best explained
return times of the translocated birds. The circuit theory and least-cost
path methods were equally supported by the data despite being based
on different sets of resistance values. The optimal resistance values
for calculating resistance distance indicated that for Ovenbirds,
traversing a given distance of edge habitat presented a substantially
greater resistance than that of open areas. On the other hand, optimized
resistances of edge and open were very similar for calculating length
of least-cost path. The circuit theory approach suggested that for
an Ovenbird moving through fragmented habitat, the number of forest-open
transitions (i.e., edge-crossings) that an individual must make is
critical to understanding return times after translocation. The least-cost
path approach, on the other hand, suggested that the birds strongly
avoid all open areas, regardless of size. Circuit theory offers an
important new approach for understanding landscapes from the perspective
of individuals moving within their breeding range, at finer spatial
scales and shorter time scales than have been previously considered.
%Z doi=(10.1007/s10980-014-0019-x); timestamp=(2014.06.02)
%( 0921-2973
%K Landscape functional connectivity; Circuit theory; Least-cost path;
Forest birds; Ovenbirds; Edge-crossing decisions; Cost surface
%G English
%# nafon9
%I Springer Netherlands
%U http://dx.doi.org/10.1007/s10980-014-0019-x
%F St-LouisForesterPelletierEtAl2014
%3 BibTeX type = ARTICLE