Site Fidelity and Natal Philopatry in Dickcissels
| Autor: | Maren E. Gimpel, Daniel M. Small, Douglas E. Gill |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Northeastern Naturalist. 19:123-129 |
| ISSN: | 1938-5307 1092-6194 |
| Popis: | Spiza americana (Dickcissel) colonized a restored Conservation Reserve Program grassland in Maryland during the second year of restoration and has continued to return in subsequent years. In 2000-2010, we banded 125 adult and hatch-year birds; during this period the population ranged annually from one to 16 individuals. Twenty-one percent of adult male Dickcissels (n = 38) returned in a subsequent nesting season, 30% of adult females (n = 20) returned, and 1.7% (n = 67) of the banded hatch-year individu- als returned. A female Dickcissel returned to these grasslands after being banded as a nestling the previous year; this bird is the fi rst nestling Dickcissel ever to be re-sighted in a subsequent year across this species range. This same female Dickcissel nested an aver- age of 196.5 m (range = 84-297 m) from her natal site over four breeding seasons, and now holds the longevity record (4 yrs, 11 months) for the species; she also became the fi rst known female Dickcissel to return to a breeding site in Maryland. At our study site, whether adult Dickcissels returned the following summer was not related to their nesting experience (success or failure) the previous year. However, males that were unsuccess- ful in procuring mates often did not return the following year, and females returned at a greater rate than males. |
| Databáze: | OpenAIRE |
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