A Telemetry-Based Study of Great Egret (Ardea alba) Nest-Attendance Patterns, Food-Provisioning Rates, and Foraging Activity in Kansas, USA
| Autor: | Alan D. Maccarone, Heather M. Stone, John N. Brzorad |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Waterbirds. 38:162-172 |
| ISSN: | 1938-5390 1524-4695 |
| DOI: | 10.1675/063.038.0205 |
| Popis: | The breeding season is a demanding period in an individual's annual cycle because it must balance energy gains with the competing demands of reproduction and self-maintenance and properly allocate time and energy to both. To better understand how this balance is reached, nest-attendance patterns, food-provisioning rates, and foraging patterns were studied in radio-tagged Great Egrets (Ardea alba) breeding in a mixed-species colony in Wichita, Kansas, from May–August 2010–2013. A total 900 bird-days for 16 Great Egrets (60 ± 32 days/bird) provided 777 records of feeding sites, yielding travel times, flight velocities, and flight distances. Prey-capture rates, capture efficiencies, prey sizes and aggressive interactions were recorded at rivers, ponds, and weirs. A data logger placed in the colony from 2011–2013 recorded 3,390 arrivals and departures by 14 Great Egrets, documenting nest-attendance patterns. Provisioning intervals (196 ± 18 min [SD]; Range = 30–2,044 min) differed among radio-tagged... |
| Databáze: | OpenAIRE |
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