Effects of Spatial Patterning within Working Pine Forests on Priority
Avian Species in Mississippi
Abstract
Within dynamic ecosystems, research into how land use change and pattern
affects species diversity has led to a suite of ecological hypotheses to
assess species-landscape associations. The Habitat Amount Hypothesis
suggests that it is the total amount of habitat, regardless of
configuration, whereas the Multi-dimensional Hypothesis suggests it is
the suite of local, landscape, and landform characteristics that have
the greatest influence on species diversity within its local landscape.
Working forests may serve as interesting systems to test these
hypotheses of amount and configuration due to the dynamic mosaic of
forest stages produced via silvicultural practices. These systems may
represent shifting steady-states, whereby at large enough scales, total
amount of a given forest age class may not vary despite changes in stand
configurations over time across a landscape of multiple stands. To
examine these competing hypotheses, we assessed avian species
associations with total amount vs. configuration of habitat in working
loblolly pine (Pinus taeda) forests in Mississippi during 2019-2020. We
estimated abundance and assessed species associations with local,
landform, and landscape characteristics using a Bayesian n-mixture model
that estimated detection dependent on availability and perceptibility of
birds. We found that habitat amount alone did not exhibit consistent
positive associations with avian abundance for both early-successional
and mature forest associated species guilds. Most target species
exhibited positive associations with patch proximity, measured by
Euclidean distance, and proximity-area index. Given the extensive
coverage of working forests and growing demand for forest products,
sustainable forestry guidelines that consider proximity of stands in
similar age classes and stages could enhance landscape suitability for
some target species guilds. Further research is needed to assess
potential effects of stand proximity to species diversity across scales.
By combining ecological theory with forest management, we can better
inform conservation measures and land use objectives in working forested
landscapes.