MOOSE RECRUITMENT, ADULT MORTALITY AND RATE OF CHANGE
Rates of change in moose (Alces alces) abundance are typically measured from 2 or more population estimates. However, λ, the finite annual rate of change, can also be calculated from annual recruitment (R) and adult mortality (M) rates by the equation: λ = (1 - M)/(1 - R). Thus, rate of change can b...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Lakehead University
1991
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| Subjects: | |
| Online Access: | http://alcesjournal.org/index.php/alces/article/view/1095 |
| Summary: | Rates of change in moose (Alces alces) abundance are typically measured from 2 or more population estimates. However, λ, the finite annual rate of change, can also be calculated from annual recruitment (R) and adult mortality (M) rates by the equation: λ = (1 - M)/(1 - R). Thus, rate of change can be assessed without population estimates; mortality rates can be estimated from R and λ; and λ measured from absolute density surveys can be cross-checked with estimates of R and M. Moose managers may also find the equation useful for interpolating moose numbers between periodic absolute density surveys. Several examples are provided to illustrate use of the equation. |
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