Publication Type: | Journal Article |
Year of Publication: | 1999 |
Authors: | Newton, I |
Journal: | Bird Study |
Volume: | 46 |
Issue: | 3 |
Date Published: | 1999 |
ISBN Number: | 0006-3657 |
Keywords: | Fringillidae, Pyrrhula, Pyrrhula pyrrhula |
Abstract: | Each year over five years (1962?67), the ratio of first-year to adult Bullfinches netted in Wytham Woods, near Oxford, increased from July or August to October, then declined to a fairly constant level from January onwards. The first-year to adult ratio in October, used as a measure of annual productivity, varied from 2.8 to 5.5 in different years. A high first-year to adult ratio in October was followed by a relatively high ratio throughout the next year and beyond (excluding the new juveniles that appeared among netted birds from July).Each year over five years (1962?67), the ratio of first-year to adult Bullfinches netted in Wytham Woods, near Oxford, increased from July or August to October, then declined to a fairly constant level from January onwards. The first-year to adult ratio in October, used as a measure of annual productivity, varied from 2.8 to 5.5 in different years. A high first-year to adult ratio in October was followed by a relatively high ratio throughout the next year and beyond (excluding the new juveniles that appeared among netted birds from July). |
URL: | http://www.tandfonline.com/doi/abs/10.1080/00063659909461146 |
Short Title: | Bird Study |
Taxonomic name: