Dispersión reproductiva del Avión Zapador Riparia riparia tras la desaparición de sus colonias en un tramo del río Esla (cuenca del río Duero, noroeste de España)

作者: Javier García Fernández

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摘要: espanolSe analiza la dispersion reproductiva del Avion Zapador Riparia riparia en un escenario cambiante debido a continua destruccion de las colonias cria, fundamentalmente por erosion fluvial y actividades extraccion aridos, el consecuente cambio su ubicacion. Se capturaron 2.943 ejemplares lo largo cinco temporadas reproduccion tramo 45 km cuenca baja rio Esla (noroeste Espana) se obtuvieron 295 recuperaciones, 71 ellas obtenidas consecutivas, analizaron diferentes parametros forzada desaparicion funcion sexo edad aves. Un 74,6% (n = 53) recapturas realizaron misma colonia 25,4% (n=18) diferentes. Solo caso produjo sin que emplazamiento origen hubiese desaparecido. No detectaron diferencias significativas tasa recaptura pero si cuanto edad, mayor los adultos, 14%, jovenes, 0,6%. En dispersantes, no o distancia dispersion, 15% mas elevada hembras. catalaS’analitza dispersio l’Oreneta Ribera escenari canviant causa destruccio les colonies fonamentalment per l’erosio i activitats d’extraccio d’arids, conseguent canvi seva ubicacio. Es van capturar exemplars al llarg cinc temporades reproduccio tram conca baixa riu (nord-oest d’Espanya) es obtenir recuperacions, d’elles obtingudes consecutives, analitzar diferents parametres forcada causada desaparicio funcio sexe l’edat dels ocells. recaptures realitzar mateixa 18) diferents. Nomes cas va produir sense l’emplacament d’origen hagues desaparegut. detectar diferencies significatives taxa quant l’edat, major els adults, joves, Pel fa als dispersants, edat dispersio, mes femelles. EnglishWe analyzed the reproductive of Bank Swallow in context change as consequence continued destruction breeding colonies, mainly by river and quarrying, their subsequent location. 2,943 birds were captured over five seasons along stretch lower course (north-west Spain). We obtained recoveries, consecutive seasons, different parameters (gender age) relating to forced caused disappearance colonies. In all, 74.6% made from same colony 25.4% other Only one case did bird even though its original had not been destroyed. Recapture rates significantly terms gender, although more adults (14%) than young (0.6%) recaptured. dispersing there differences age or sex, only dispersal distance, which was higher females

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