Fish and Wildlife Population Ecology
Dr. Edward O. Garton

 

Animal Abundance: Estimating "True" Number of Birds or Mammals Present During a Study

A workshop presented by
Dr. Edward O. Garton, UI Professor
of Wildlife Resources and Applied Statistics

April 14-18, 2008
Bishop, California

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Wildlife biologists, conservation biologists and animal researchers in general are being challenged to provide unbiased estimates of the "true" number of birds or mammals present on a site. Traditional methods such as point counts for birds are being denigrated as nothing more than indices of abundance biased by observers abilities and attitudes.  Recent developments in theory and methods provide invaluable assistance to biologists, managers, and researchers facing this challenge. This five day workshop (April 14-18, 2008) is designed especially for wildlife, conservation, and other natural resource professionals needing an introduction or in-depth summary of recent developments in our approaches to eliminating observer and other sources of bias from estimates of abundance and density of birds and mammals. Participants will learn how to use paired or double observer approaches to bird surveys as well as radiotelemetered mammals to remove visibility bias from raw counts. Participants will gain hands-on experience in the use of statistical and proprietary analysis software by analyzing recent data from bird and mammal surveys in the Pacific Northwest.

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WORKSHOP AGENDA
Monday 4/14- 1:00 to 5 p.m.
  • Welcome and Introduction
  • Review of Basic Concepts
    Individual, demes/subpopulations, populations, and metapopulations
    Spatial distributions
    Population characteristics and processes
    Statistical populations and samples
    Estimation
    Point counts and variable circular plots
    Line transects
    Aerial surveys

Tuesday 4/15  - 8:15 a.m. to 5 p.m.

  • Elements of Sampling
    Review of basic principles
    Sampling designs
        Simple random sampling
        Stratification
        Cluster sampling

    Selecting an optimal design
  • Bird Surveys
    History
    Definitions
    Indices or estimates of true density?
  • Distance Sampling
    Development of approaches from strips
    Assumptions and models
    Theory
    Line transects
    Point transects
Wednesday 4/16  - 8:15 a.m. to 5 p.m.
  • Probability of detection
    Double observer approaches
    Paired observer variable circular plots
    Logistic modelling
    Information Theory and Model Evaluation
  • Designing Unbiased Surveys
    Objectives for inventory and monitoring
    Removing bias
    Sampling design

Thursday 4/17  8:15 a.m. to 5 p.m.

  • Surveys for Large Mammals
    Historical development
    Censuses vs. indices
    Ground counts vs. aerial surveys
  • Visibility Bias in Surveys
    Historical development
    Double sampling
    Modeling probability of detection
    Survey design and efficiency

Friday 4/18  8:15 a.m. to 12 noon.

  • Mark-recapture/resight Methods
    Lincoln-Petersen: Closed - Single Marking
    Schnabel: Closed - Multiple Marking

    CAPTURE: Closed - Multiple - Complex
    Cormack-Jolly-Seber: Open Populations
    MARK: Banding to Nests to Robust Designs
  • Design
    Planning large scale surveys
    Monitoring vs. intensive studies
    Examples of applications

 

 

LOCATION AND TIME  -  Bishop, California - USFS Office

When taught on campus, all meetings will be held at the University of Idaho, Moscow, Idaho. Meetings will run from 1 p.m. on Monday, April 14 till noon on Friday April 18, 2008.  

PREREGISTRATION

The registration fee is NOT YET SET per participant. You may register on-line or print out the registration form and mail/FAX with payment to the Department of Fish and Wildlife Resources, University of Idaho, Moscow, ID 83844-1136.  A late fee of $100 will be added if check/PO/Invoice/Credit-Card payment not received 2 weeks prior to start of workshop.

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LOCATION AND TIME

For courses on campus, all meetings will be held at the College of Natural Resources (Room 14), 6th and Line Street, University of Idaho, Moscow, Idaho. Meetings will run from 1:00 p.m. on Monday, April 14, 2008 through 12:00 noon on Friday.

CREDIT

Workshop participants will accrue 20 contact hours toward The Wildlife Society's Professional Development Program, or credits toward other societies (AFS, ESA, SCB) continuing education requirements for professionals.  One graduate credit for Wlf 504 is available from the University of Idaho's College of Graduate Studies for an additional fee.  Graduate credit requires completing all lab assignments and writing a short paper after the course concludes.

QUESTIONS

For transportation, registration, or logistical information, please call the Department of Fish and Wildlife Resources at 208-885-6434 or fish_wildlife@uidaho.edu.

 

Date this page was last updated:  12/20/07