0000000001325276
AUTHOR
Fabien Laroche
Beyond the fragmentation debate in forest planning: how do habitat amount and spatial arrangement matter for saproxylic beetle diversity?
In managed forests, intensive silvicultural practices reduce the density/diversity of deadwood and tree microhabitats at the forest stand scale. This negatively affects biodiversity, especially saproxylic beetles which dependent upon these old-growth attributes. At the landscape scale, forest management plans lead to a spatial heterogeneity of these attributes which can be perceived as a source of fragmentation by many saproxylic species. However, the influence of saproxylic resources distribution at large scales received little attention to date. More particularly, the relative importance of quantity vs. fragmentation per se (spatial configuration of resources independently from quantity) …
Density-dependent detectability in dynamic occupancy survey: a case study on a vulnerable beetle species in hollow trees
Conservation of threaten species living in fragmented habitats crucially relies on evaluating their occupancy and their ability to colonize and persist in habitat patches. Fitting stochastic patch occupancy models (SPOMs) to occupancy data can help assessing these features. However it is critical to account for the limited detectability of target species in this type of analysis to avoid severe biases in estimation. Detectability of a population in a habitat patch often tightly depends on the local density of individuals. This connection between density and detectability has rarely been used in SPOM analysis, even when abundance data are available. The two quantities are often considered in…