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Assessing the Probability of Species Occurrence and Detection with Occupancy Models Tuesday, Feb. 24, 2015; 8AM-5PM Cost: $60 USD Maximum Enrollment: 25 Presented by the Society for Northwestern Vertebrate Biology http://thesnvb.org/annual-meeting-2015/ Instructors: Mike Adams and Tara Chestnut, USGS Amphibian Research and Monitoring Initiative (ARMI Program) In ecological research, it is often of interest to ask questions about the probability of species occurrence when detection is imperfect. For example, how does the probability that a pond is occupied by red-legged frogs relate to the occurrence of non-native fish?; or the occurrence of a pathogen relate to water chemistry? Such analyses rely on survey data that result from efforts to detect the species of interest and measure site characteristics. These analyses are hampered by false negatives: the failure to detect a species at a site where it is present. Occupancy models can be used to estimate the probability that a site is occupied (and other parameters related to changes in occupancy) despite false negatives. They use repeated observations to estimate and account for the probability that a single observation will detect a species that is present. Since their initial development in 2002, there have been several important expansions of the occupancy modeling framework including multi-season models that estimate local extinction and colonization rates, two-species models that deal with false negatives in two species simultaneously, multi-state models that allow response categories beyond just presence and absence, and integrated habitat models that deal with sites that may or may not exist in a given year (e.g., ephemeral ponds). We have also come to better understand some of the pitfalls of occupancy models. The main goals of this workshop are to: 1) Offer a primer to the basic occupancy model and introduction to the free software program PRESENCE; 2) Overview of the range of occupancy models currently available; 3) Offer hands on experience to help get you started with occupancy studies and one-on-one consultations to address questions regarding your specific project. The target audience: Participants are beginners to occupancy analyses but have a basic understanding of regression analysis. To register: http://thesnvb.org/event/2015-meeting-registration/ Please bring your own PC laptop with the latest version of PRESENCE installed (http://www.mbr-pwrc.usgs.gov/software). Otherwise you should be able to pair with someone with a laptop. Contact Michael_Adams@usgs.gov with any questions. -
Instructors: Marc Kéry & Jérôme Guélat, Swiss Ornithological Institute Date: 9–11 February 2015 Venue: Universidade Federal de Viçosa, Minas Gerais, Brazil Computers: Bring your own laptop with latest R, JAGS and WinBUGS or OpenBUGS Costs: 1000 Reais (400 US$) This course gives an introduction to Bayesian statistical modeling using BUGS software and then introduces a key class of models for the analysis of species distribution, habitat selection, occurrence and abundance: site‐occupancy models (MacKenzie et al. 2002, 2003; Tyre et al. 2003). Model fitting is shown using the Bayesian BUGS software and the R package unmarked. The course follows the book “Bayesian population analysis using WinBUGS” (Academic Press, 2012) by Kéry & Schaub and the upcoming book “Applied hierarchical models in ecology” (Academic Press, 2015) by Marc Kéry & Andy Royle. See the attached flier for more details. Occupancy Workshop Announcement, Vicosa, 9-11 Feb 2015.pdf -
Note early-bird registration period ends 1 October! University of California, Davis, California: 20-24 October 2014 University of Wyoming, Laramie, Wyoming: 27-31 October 2014 Instructor: Darryl I. MacKenzie, Proteus Wildlife Research Consultants Cost: US$800 until 1 October, US$850 thereafter In these courses participants will be instructed in methods for modeling patterns and dynamics of species occurrence with emphasis on accounting for imperfect detection, with computer exercises in PRESENCE and R. Important issues for study design will also be covered. Additional details and registration available at http://www.proteus.co.nz/courses.php
