– Module 7 – How to estimate the size of a large group Identifying and Counting Waterbirds in...
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Transcript of – Module 7 – How to estimate the size of a large group Identifying and Counting Waterbirds in...
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– Module 7 – How to estimate the size of a large group
Identifying and Counting Waterbirds in Africa – Training Course –
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Module 7 – How to estimate the size of a large group
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Authors
Revised and designed in 2012 by: Nathalie Hecker [email protected]
Designed and written in 2001 by: Nathalie Hecker & Marc Lutz
Photographs Steve Garvie [email protected], www.pbase.com/rainbirder
IllustrationsCyril Girard [email protected], www.cyrilgirard.fr
TranslationRachel Wakeham [email protected]
This training course is one of the tools of : Hecker N., 2012. Identifying and Counting Waterbirds in Africa – A toolkit for trainers. ONCFS, Hirundo-FT2E. France
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Module 7 – How to estimate the size of a large group
Presenting the Module
Technical explanations
Indoor exercises
Fieldwork
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Module 7 – How to estimate the size of a large group
How to count waterbirds
Knowing how to count waterbirds is:
•Knowing when to count and when to estimate
•Knowing how to count a small group of birds
•Knowing how to estimate a large group
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Module 7 – How to estimate the size of a large group
Estimating a single-species group
Learning objectives of the Module
At the end of this Module you will be able to:•Make an initial overall estimate of a group of birds•Immediately choose the size of the “block” to be recorded•Distinguish differences in density within the group of birds•Quickly apply the “block” method
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Module 7 – How to estimate the size of a large group
Estimating a single-species group
Stages of estimating
1.Estimate the overall size of the group
2.Choose the “block” size to be covered (about 10% of the overall size)
3.Discern differences in density and distribution within a group
4.Quickly apply the “block” method when birds are in flight
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Module 7 – How to estimate the size of a large group
Example for estimating a single-species group
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Module 7 – How to estimate the size of a large group
Estimating a single-species group
Indoor exercise Procedure: working in pairs1. Make an overall estimate2. Choose the block size (10% of the total size)3. “Cut” the flock of birds into blocks4. Make a final estimate of the group size
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Module 7 – How to estimate the size of a large group
Estimating a single-species group
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Module 7 – How to estimate the size of a large group
Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Estimating a single-species group
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Module 7 – How to estimate the size of a large group
Estimating a single-species group
Fieldwork practice
• Regular training is important
• Groups that are easy to see and which are not very mobile should be chosen first, such as Greater Flamingos at rest, duck roosts, or Cattle Egret roosts
• It is possible to practice using “material” other than waterbirds, even away from the wetland
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Module 7 – How to estimate the size of a large group
Estimating a multi-species group
Learning objectives of the Module
At the end of this Module you will be able to:
• Estimate numbers of different species within a group of birds
• Assess the risk of overestimating or underestimating
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Module 7 – How to estimate the size of a large group
Estimating a multi-species group
Indoor exercise: Estimating two different sized speciesProcedure: working alone and in groups1.Trainees should estimate the numbers of each species
within a limited time2.They should calculate the error percentage of the
result3.They should comment on the result and error
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Estimating a multi-species group
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Estimating a multi-species group
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Estimating a multi-species group
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Estimating a multi-species group
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Estimating a multi-species group
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Estimating a multi-species group
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Module 7 – How to estimate the size of a large group
Estimating a multi-species group
Fieldwork• Any multi-species group found outdoors can be used
for training• Groups which are easy to see and not very mobile
should be chosen at first, such as roosts of different species of ducks, Ardeidae roosts with Cattle Egrets and herons, and so on
• Move on to groups of ducks or waders in flight• Regular practice is vital!
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Thanks for your attention!