Use of social indices to predict reproductive success in canvasbacks
Journal of Wildlife Management
By: J.R. Serie and L.M. Cowardin
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Abstract
We correlated temporal changes in social groupings of canvasbacks (Aythya valisineria) breeding near Minnedosa, Manitoba, with an independent estimate of hen success during 1974-80. Roadside counts of pairs, lone males, and flocked males were made along transects at 5-day intervals, normalized to percentages to allow comparisons among years, and plotted to obtain measurements of selected areas between and under the curves. An estimate of hen success was regressed on these selected graph areas each year to derive a predictive equation. Graph areas (social indices) determined from temporal changes in the proportion of pairs, lone males, and flocked males correlated (ri?? = 0.69-0.93) with hen success. This technique avoids the need for pair counts, nest searches, and brood counts and provides managers with a useful index to evaluate local management practices and to predict yearly production in time for setting hunting regulations.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Use of social indices to predict reproductive success in canvasbacks |
| Series title | Journal of Wildlife Management |
| Volume | 54 |
| Issue | 1 |
| Year Published | 1990 |
| Language | English |
| Contributing office(s) | Northern Prairie Wildlife Research Center |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Wildlife Management |
| First page | 66 |
| Last page | 72 |
| Google Analytic Metrics | Metrics page |