Optimal Clutch Size of American Kestrels (Falco sparverius) in Northern New York
Mon, 04/28/2014 - 12:08
Abstract: American kestrels readily use nest boxes, which makes them perfect candidates for studies on nesting activity and success. Nesting success is important to understand so that managers can effectively assess the productivity of a breeding population of kestrels. The goal of this study was to determine optimum clutch size for American Kestrels in Northern New York. The hypothesis was that optimum clutch size consisted of four eggs per clutch. The objective was to determine what clutch size is most effective at hatching young. The study was conducted during the months of June 2013 through August 2013 on 150 nest boxes that were established in 2002. The contents of each elevated nest box were observed using a video baby monitor attached to an extendible pole to minimize disturbance. Clutch size data and number of chicks hatched was compiled and analyzed using a Kruskal-Wallis test. This test was used because it allowed data to be separated into different clutch sizes, and determined the significance between the number of eggs in each clutch and the number of chicks hatched. Clutch sizes varied from 1-5 eggs, with occurrences of one and four eggs being most common. The majority of nesting attempts with one egg failed, resulting in a low probability of chicks hatching from one egg clutches. A clutch size of four eggs has the highest probability of successfully hatching chicks and the highest mean number of chicks hatched compared to the other clutch sizes.
Literary Rights: On
Major: Fisheries and Wildlife Science
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