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Influences of Availability on Parameter Estimates from Site Occupancy Models with Application to Submersed Aquatic Vegetation

Natural Resource Modeling

By:
, , ,
DOI: 10.1111/nrm.12012

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Abstract

Site occupancy models are commonly used by ecologists to estimate the probabilities of species site occupancy and of species detection. This study addresses the influence on site occupancy and detection estimates of variation in species availability among surveys within sites. Such variation in availability may result from temporary emigration, nonavailability of the species for detection, and sampling sites spatially when species presence is not uniform within sites. We demonstrate, using Monte Carlo simulations and aquatic vegetation data, that variation in availability and heterogeneity in the probability of availability may yield biases in the expected values of the site occupancy and detection estimates that have traditionally been associated with low-detection probabilities and heterogeneity in those probabilities. These findings confirm that the effects of availability may be important for ecologists and managers, and that where such effects are expected, modification of sampling designs and/or analytical methods should be considered. Failure to limit the effects of availability may preclude reliable estimation of the probability of site occupancy.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Influences of Availability on Parameter Estimates from Site Occupancy Models with Application to Submersed Aquatic Vegetation
Series title:
Natural Resource Modeling
DOI:
10.1111/nrm.12012
Volume
26
Issue:
4
Year Published:
2013
Language:
English
Publisher:
Wiley
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
20 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
526
Last page:
545