Trends and seasonal variation in population of common coot (Fulica otra) and its correlation with submerged macrophytes and environmental variables
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2017-10-16
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Jaén: Universidad de Jaén
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[ES] El tamaño de la población de aves acuáticas está estrechamente relacionado con la disponibilidad de
macrófitos sumergidos. En este estudio, se analizaron las tendencias y variaciones estacionales de la
población de focha común (Fulica otra) en 31 humedales de siete tipologías durante el período 2003-2008,
en correlación con las variaciones estacionales de cobertura de macrófitos sumergidos y la influencia de
diferentes variab les ambientales (conductividad, profundidad del agua, y el tamaño de los humedales). En
total se contabilizaron 213.136 individuos de focha común, con un valor medio de 99,64 aves por año. Las
tendencias de la población variaron de inciert o, fuerte incremento, y declive fuerte. La abundancia de focha
fue alta en verano, correspondiente a los eventos de crecimiento y floración de macrófitos sumergidos en
primavera. La salinidad, la profundidad del agua y el tamaño de los humedales son las principales variables
en el uso del hábitat de focha porque los cambios de estas variables tienen un impacto sobre los macrófitos
sumergidos. La focha parece preferir los humedales de gran tamaño, con una profundidad del agua entre 2
- 4 m, baja salinidad (dulces - hiposalinos), y evitar la competencia interespecífica con otras aves acuáticas.
Además, los humedales deben tener abundante vegetación sumergida con una alta diversidad específica
que permita una diversidad de recursos alimenticios para ayudar al crecimiento y desarrollo de los pollos.
[EN] The population size of waterfowl is known to be closely related to the availability of submerged macrophytes. In this study, trends and seasonal variations of the population of Common Coot (Fulica otra) were analyzed in 31 wetlands of seven typologies during 2003-2008, in correlation with seasonal variations of submerged macrophytes cover which influenced by environmental variables (conductivity, water depth, and wetlands size). In total, 213,136 individuals of Common Coot were counted with a mean value of 99.64 birds per year. Population trends were varied from uncertain, strong increase, and steep decline. Coots abundance was high in summer corresponding to growing and flowering events of submerged macrophytes in spring. Salinity, water depth, and wetland size are the major habitat variables which playing important role in the habitat use by coot because the changes of these variables have major impact on submerged macrophytes and water-state shifts in wetland a reas. Coot seemed to prefer wetlands with large size, water depth between 2 - 4 m, low salinity (freshwater - hyposaline), and avoid interspecific competition with other waterbird s. Moreover, wetlands must have abundant submerged vegetation with a high specific diversity that allows a diverse food of resources to help the growth and development of the chicks.
[EN] The population size of waterfowl is known to be closely related to the availability of submerged macrophytes. In this study, trends and seasonal variations of the population of Common Coot (Fulica otra) were analyzed in 31 wetlands of seven typologies during 2003-2008, in correlation with seasonal variations of submerged macrophytes cover which influenced by environmental variables (conductivity, water depth, and wetlands size). In total, 213,136 individuals of Common Coot were counted with a mean value of 99.64 birds per year. Population trends were varied from uncertain, strong increase, and steep decline. Coots abundance was high in summer corresponding to growing and flowering events of submerged macrophytes in spring. Salinity, water depth, and wetland size are the major habitat variables which playing important role in the habitat use by coot because the changes of these variables have major impact on submerged macrophytes and water-state shifts in wetland a reas. Coot seemed to prefer wetlands with large size, water depth between 2 - 4 m, low salinity (freshwater - hyposaline), and avoid interspecific competition with other waterbird s. Moreover, wetlands must have abundant submerged vegetation with a high specific diversity that allows a diverse food of resources to help the growth and development of the chicks.