Osprey Diet Composition and Quality in High- and Low- Salinity Areas of Lower Chesapeake Bay
Authors:
- K. Andrew GlassKGK. Andrew Glass
- Bryan D. WattsBWBryan D. Watts
- 1 March 2009
- journal article
- Published by The Raptor Research Foundation, Inc. in Journal of Raptor Research
- Vol. 43 (1) , 27-36
Abstract
Chesapeake Bay, in the northeastern United States, is believed to support the largest concentration of breeding Ospreys (Pandion haliaetus) in the world. Following the banning of DDT, this population exhibited significant spatial variation in growth rates, with the fastest and slowest rates occurring in the lowest and highest salinity areas, respectively. Because salinity can influence fish distributions, we quantitatively analyzed Osprey diet composition along the gradient in the Chesapeake Bay to determine if variation in foraging ecology contributed to this pattern of population recovery. We recorded >1800 hr of food-provisioning behavior for 25 pairs within nine study areas that were classified as either upper estuarine (18 ppt). Atlantic menhaden (Brevoortia tyrannus) and seatrouts (Cynoscion spp.) were dominant dietary components for pairs within lower-estuarine reaches, whereas gizzard shad (Dorosoma cepedianum) and catfish (Ictalu... Resumen Se cree que la bahía de Chesapeake, ubicada en el este de los Estados Unidos, sostiene la concentración más grande de individuos reproductivos de la especie Pandion haliaetus del mundo. Tras la prohibición del DDT, existió variación espacial sustancial en la tasa de crecimiento de esta población. Las tasas más altas y más bajas se presentaron en las áreas de salinidad máxima y mínima, respectivamente. Debido a que la salinidad puede influenciar las distribuciones de los peces, analizamos cuantitativamente la composición de la dieta de P. haliaetus a lo largo del gradiente en la bahía de Chesapeake para determinar si variaciones en la ecología de forrajeo habrían contribuido a este patrón de recuperación poblacional. Registramos más de 1800 horas de comportamiento de provisión de alimento para 25 parejas en nueve áreas de estudio que habían sido clasificadas ya sea, como estuarinas altas (menos de 5 partes por mil de salinidad) o estuarinas bajas (más de 18 partes por mil). Los peces Brevoortia tyr...Keywords
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