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Breeding in a Dry Wetland. Demographic Response to Drought in the Common Reed-Warbler Acrocephalus scirpaceus

Authors: Jiménez, José; Hernández, José Manuel; Feliú, Jordi; Carrasco, Manuel; Moreno-Opo, Rubén;

Breeding in a Dry Wetland. Demographic Response to Drought in the Common Reed-Warbler Acrocephalus scirpaceus

Abstract

[ES]: Los humedales mediterráneos muestran notables variaciones estacionales y anuales en su hidroperíodo, o período de tiempo durante el cual humedal está inundado. Se ha demostrado que las reducciones del hidroperíodo inducidas por el cambio climático afectan a las aves palustres, pero se precisan más estudios para comprender este proceso en los humedales Mediterráneos. El presente estudio muestra la respuesta demográfica del carricero común Acrocephalus scrirpaceus (Hermann, 1804) a una inusual y prolongada sequía en el Parque Nacional de Tablas de Daimiel, humedal situado en el centro de España. Utilizamos los datos de 2005 a 2013 de las estaciones de anillamiento de esfuerzo constante del Parque, y modelos Jolly-Seber espacialmente explícitos de captura-recaptura. Observamos que la especie siguió reproduciéndose en un ambiente seco durante tres años después del inicio de una fase seca -aunque con una progresiva disminución de la productividad- y finalmente dejó de reproducirse en el cuarto año. Después de la recuperación de los niveles de agua, la especie requirió otros cuatro años para recuperar un tamaño de población y productividad similares a los anteriores a la sequía. Esta situación puede ser común en un futuro próximo según las previsibles alteraciones del hidroperíodo en los humedales mediterráneos como consecuencia del cambio climático y / o el aumento de la sobreexplotación del agua subterránea, lo que afectaría la dinámica poblacional del carricero común y otras especies de aves palustres. También mostramos que los modelos de captura-recaptura espacialmente explícitos permiten la detección de cambios en las poblaciones de pequeños paseriformes y son un enfoque preciso para estimar sus densidades.

[EN]: Mediterranean wetlands show remarkable seasonal and annual variations in their hydroperiod, i.e. the period during which they are inundated. Climate change-induced hydroperiod reductions have been shown to affect marshland birds but more studies are needed to understand this process in Mediterranean wetlands. The present study shows the demographic response of the Common Reed-warbler Acrocephalus scirpaceus to an unusual and prolonged drought in the Tablas de Daimiel National Park wetland (central Spain). We used data from two constant effort mistnetting stations (2005-2013), and spatially explicit capture-recapture Jolly-Seber models. The Reed-warblers continued reproducing in a dry environment for three years after the start of a dry phase, despite progressive declines in productivity, and ultimately stopped nesting in the fourth year. After the recovery of water levels in subsequent years, the population required another four years to recover a size and productivity similar to those preceding the drought. This situation may be common in the near future given ongoing alterations of the hydroperiod in Mediterranean wetlands as a consequence of climate change and groundwater overexploitation. We also show that spatially explicit capture- recapture models allow the detection of changes in the populations of small passerines, and are an accurate approach to estimating their densities.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
downloads
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8
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34
110
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