Shelters Decrease Gull Predation on Chicks at a Common Tern Colony (Refugios Reducen la Depredación de Polluelos de Sterna hirundo Por Parte de Gaviotas (Larus spp.))

Predation by gulls on Common Tern (Sterna hirundo) chicks at a colony near Port Colborne, Ontario has annually resulted in reduced breeding success among late nesting terns. Small chick shelters were designed and their effectiveness at reducing larid predation rates was tested. Observations of preda...

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Veröffentlicht in:Journal of field ornithology 1992-04, Vol.63 (2), p.186-189
Hauptverfasser: Burness, Gary P., Morris, Ralph D.
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description Predation by gulls on Common Tern (Sterna hirundo) chicks at a colony near Port Colborne, Ontario has annually resulted in reduced breeding success among late nesting terns. Small chick shelters were designed and their effectiveness at reducing larid predation rates was tested. Observations of predation on chicks were performed before and after shelters were placed next to each of 30 nests. Predation on chicks was commonly observed prior to shelter placement and declined to zero therafter. The number of chicks that disappeared was significantly reduced after shelter placement. In view of the declining Common Tern population on the Great Lakes, efforts to minimize predation are imperative. /// La depredación de pichones de Sterna hirundo por parte de gaviotas (Larus spp.) en una colonia cerca de Port Colborne, Ontario, ha traído como resultado un reducción en el éxito de anidamiento de individuos de S. hirundo que anidan tarde. Se diseñaron unos refugios para pichones para probar su efectividad en la reducción de la tasa de depredación por parte de gaviotas. Se hicieron observaciones sobre depredación antes y después de colocar refugios cercanos a 30 nidos. Previo a la introducción de los refugios, la depredación fue un fenómeno común el cual se redujo a cero con la colocación de los refugios. En vista de la reducción en números de la población de individuos de S. hirundo en los Grandes Lagos, los esfuerzos para minimizar la depredación de estas aves es inminente.
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Small chick shelters were designed and their effectiveness at reducing larid predation rates was tested. Observations of predation on chicks were performed before and after shelters were placed next to each of 30 nests. Predation on chicks was commonly observed prior to shelter placement and declined to zero therafter. The number of chicks that disappeared was significantly reduced after shelter placement. In view of the declining Common Tern population on the Great Lakes, efforts to minimize predation are imperative. /// La depredación de pichones de Sterna hirundo por parte de gaviotas (Larus spp.) en una colonia cerca de Port Colborne, Ontario, ha traído como resultado un reducción en el éxito de anidamiento de individuos de S. hirundo que anidan tarde. Se diseñaron unos refugios para pichones para probar su efectividad en la reducción de la tasa de depredación por parte de gaviotas. 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source SORA - Searchable Ornithological Research Archive; JSTOR Archive Collection A-Z Listing; EZB-FREE-00999 freely available EZB journals
subjects Brackish
Chicks
Eggs
Freshwater
Hatching
Larus
Life Sciences & Biomedicine
Marine
Nesting sites
Ornithology
Predation
Science & Technology
Shelters
Sterna hirundo
Zoology
title Shelters Decrease Gull Predation on Chicks at a Common Tern Colony (Refugios Reducen la Depredación de Polluelos de Sterna hirundo Por Parte de Gaviotas (Larus spp.))
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