Deteriorating Weather Conditions Predict the use of Suboptimal Stopover Sites by Aquatic Warblers<i>Acrocephalus paludicola</i>

Arizaga, Juan; Mendiburu, Agustín; Andueza, Miren; Fontanilles, Philippe; Fourcade, Jean-Marc; Urbina-Tobias, Patrice

doi:10.3161/000164511x625973

Cited by 9 publications

(9 citation statements)

References 10 publications

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“…Our data support the idea that the AW seems to gain body mass significantly at only a few stopover sites, but not fly directly from France or North Spain to the wintering quarters in West Africa (Jakubas et al 2014). The conservation of these few refuelling sites known to AW (Kerbiriou et al 2011) which in some cases also act as emergency stopover sites during adverse weather (Arizaga et al 2011b), is therefore essential. Amongst them are the Spanish inland wetlands, particularly those located in the Duero basin, which are much more scattered and in many cases much smaller than others on the north coast of Western France with a higher carrying capacity (Arizaga et al 2014).…”

Section: Captures Of Aquatic Warblerssupporting

confidence: 80%

“…The same conservation problem has been observed in some breeding, migration and wintering sites (Kozulin and Krogulec 1999;Tanneberger et al 2008;Kerbiriou et al 2011;Arbeiter and Tegetmeyer 2011), where cattail and shrub willow overgrowth has converted optimal habitats into suboptimal ones: greater density and height of taller vegetation that is of less interest to AW. Gravel-pits cannot replace the loss of natural wetland, but in certain areas they can represent alternative and temporary habitat that can be used as emergency stopovers or during rough weather conditions (Arizaga et al 2011b;Overdijk and Navedo 2012). However, their instability and rapid vegetation dynamics make them difficult to manage (Ř ehounková and Prach 2010).…”

Section: Vegetation: Characterization and Changesmentioning

confidence: 99%

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Use of an abandoned gravel-pit in inland Spain as a stopover site for the Aquatic Warbler Acrocephalus paludicola

Miguélez

García

Castro

et al. 2015

Wetlands Ecol Manage

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Stopover sites are of vital importance for migrating birds, especially long-distance migrant species. This study describes a wetland in NW Spain, as a particular habitat used by the Aquatic Warbler, one of the most threatened passeriformes in Europe, during postnuptial migration. It is a recently abandoned gravel-pit with an artificial water regime, a large area of standing water and a mosaic of vegetation predominated by a rush-meadow of Juncus effusus and a cattail community of Typha domingensis, a priori very favourable conditions for the Aquatic Warbler. The Acrola index value for this locality is very high, and together with some of the results including mean stopover period, fattening rate, interannual site fidelity and calculated potential flight distances, indicates that the mosaic of plant communities offers good conditions as a refuelling site for the Aquatic Warbler.Nevertheless, in only 3 years a process of homogenization has been observed in the vegetation, where rushmeadow cover has decreased noticeably and cattail and willow cover have increased. This process caused a decrease in the Acrola index throughout 2008-2010, as well as a significant decrease in the importance of this wetland with regard to others in Spain. Significant differences were found in body condition between the two age groups: adults are heavier and obtain more body fat, which provides them with greater potential flight autonomy. Although gravel pits can act as alternative wetlands, rapid changes in plant communities succession requires more active management than in the case of natural wetlands.

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Section: Captures Of Aquatic Warblerssupporting

confidence: 80%

Section: Vegetation: Characterization and Changesmentioning

confidence: 99%

Use of an abandoned gravel-pit in inland Spain as a stopover site for the Aquatic Warbler Acrocephalus paludicola

Miguélez

García

Castro

et al. 2015

Wetlands Ecol Manage

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“…Migrating birds encounter widely varying weather conditions throughout their seasonal journeys. Weather conditions may affect the timing of migration onset (Shamoun‐Baranes et al ), stop‐over schedules (Drake , Bauer et al , Arizaga et al , Ma et al ), the route followed by migrants (Bohrer et al ), and their speed during travel (Gordo , Shamoun‐Baranes et al ). If adverse weather conditions are met during migration, birds risk delayed arrival and poor body condition, which in turn may affect their competitiveness or reproductive success (Drake et al ).…”

mentioning

confidence: 99%

Regional and seasonal flight speeds of soaring migrants and the role of weather conditions at hourly and daily scales

Vansteelant

Bouten

Klaassen

et al. 2014

Journal of Avian Biology

148

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Given that soaring birds travel faster with supportive winds or in good thermal soaring conditions, we expect weather conditions en route of migration to explain commonly observed regional and seasonal patterns in the performance of soaring migrants. We used GPS-loggers to track 13 honey buzzards and four Montagu's harriers for two to six migrations each. We determined how tailwinds, crosswinds, boundary layer height (a proxy for thermal convection) and precipitation aff ected hourly speeds, daily distances and daily mean speeds with linear regression models. Honey buzzards mostly travel by soaring while Montagu's harriers supplement soaring with fl apping. Th erefore, we expect that performance of harriers will be less aff ected by weather than for buzzards. Weather conditions explained between 30 and 50% of variation in migration performance of both species. Tailwind had the largest eff ect on hourly speeds, daily mean speeds and daily travel distances. Honey buzzards travelled signifi cantly faster and farther, and Montagu ' s harriers non-signifi cantly faster, under better convective conditions. Honey buzzards travelled at slower speeds and shorter distances in crosswinds, whereas harriers maintained high speeds in crosswinds. Weather conditions varied between regions and seasons, and this variation accounted for nearly all regional and seasonal variation in fl ight performance. Hourly performance was higher than predicted at times when we suspect birds had switched to intermittent or continuous fl apping fl ight, for example during sea-crossings. Th e daily travel distance of Montagu ' s harriers was determined to a signifi cant extent by their daily travel time, which diff ered between regions, possibly also due to weather conditions. We conclude with the implications of our work for studies on migration phenology and we suggest an important role for high-resolution telemetry in understanding migratory behavior across entire migratory journeys.

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“…Canterina o Valcavado. En cambio el resto, Canal de Castilla y El Villar, presentan valores bajos que pueden indicar que podrían ser utilizados como lugares de sedimentación secundarios o durante periodos de tiempo adverso por sus características de hábitat subóptimas para el carricerín cejudo (Arizaga et al 2011b(Arizaga et al , 2014. Igualmente, las medidas del estado corporal y los parámetros de sedimentación muestran valores muy elevados para los cejudos capturados en los humedales La Canterina y Valcavado, y sólo son superados a nivel ibérico por la estación del río Miño (Robles & Arcas 2004).…”

Section: Aportación De Los Registrosunclassified

“…Sin embargo, el índice Acrola en el tercer seguimiento (Capítulo IV) es bajo, del mismo modo que el número de capturas, la tasa de recaptura y el valor de masa corporal también lo son. Estos datos pueden indicar que este humedal podría ser utilizado como lugar de sedimentación secundario o durante periodos de tiempo adverso como indica Arizaga et al (2011bArizaga et al ( , 2014 para algunos humedales ibéricos con características de hábitat subóptimas para la especie.…”

Section: Migraciónunclassified

Migración posnupcial y conservación del carricerín cejudo "Acrocephalus paludicola" en humedales de la meseta norte = Post-nuptial migration and conservation of Aquatic Warbler "Acrocephalus paludicola" in wetlands of the Iberian Northern Plateau

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Deteriorating Weather Conditions Predict the use of Suboptimal Stopover Sites by Aquatic WarblersAcrocephalus paludicola

Cited by 9 publications

References 10 publications

Use of an abandoned gravel-pit in inland Spain as a stopover site for the Aquatic Warbler Acrocephalus paludicola

Use of an abandoned gravel-pit in inland Spain as a stopover site for the Aquatic Warbler Acrocephalus paludicola

Regional and seasonal flight speeds of soaring migrants and the role of weather conditions at hourly and daily scales

Migración posnupcial y conservación del carricerín cejudo "Acrocephalus paludicola" en humedales de la meseta norte = Post-nuptial migration and conservation of Aquatic Warbler "Acrocephalus paludicola" in wetlands of the Iberian Northern Plateau

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