Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina
Agricultural expansion and intensification resulted in important changes in the agricultural landscape of the Pampas region, Argentina. We used linear mixed models to analyze the relationship between environmental variables associated to land use/cover, productivity and climate and changes in densit...
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| Format: | info:ar-repo/semantics/artículo |
| Language: | Inglés |
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Aves Argentinas/Asociación Ornitológica del Plata
2018
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| Subjects: | |
| Online Access: | http://www.scielo.org.ar/pdf/hornero/v31n2/v31n2a05.pdf http://hdl.handle.net/20.500.12123/4134 |
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| author | Calamari, Noelia Cecilia Cerezo, Alexis Canavelli, Sonia Beatriz Dardanelli, Sebastian Gavier Pizarro, Gregorio Ignacio Zaccagnini, Maria Elena |
| author_browse | Calamari, Noelia Cecilia Canavelli, Sonia Beatriz Cerezo, Alexis Dardanelli, Sebastian Gavier Pizarro, Gregorio Ignacio Zaccagnini, Maria Elena |
| author_facet | Calamari, Noelia Cecilia Cerezo, Alexis Canavelli, Sonia Beatriz Dardanelli, Sebastian Gavier Pizarro, Gregorio Ignacio Zaccagnini, Maria Elena |
| author_sort | Calamari, Noelia Cecilia |
| collection | INTA Digital |
| description | Agricultural expansion and intensification resulted in important changes in the agricultural landscape of the Pampas region, Argentina. We used linear mixed models to analyze the relationship between environmental variables associated to land use/cover, productivity and climate and changes in densities of two bird species, the Fork-tailed Flycatcher (Tyrannus savana) and the White-browed Blackbird (Sturnella superciliaris). The study area in central Argentina was divided in three agroproductive sub-regions: (1) predominantly agricultural, (2) mixed agricultural- rangeland and (3) mixed agricultural-forested rangeland. Bird populations were sampled annually during 2003-2011 using point-transects along secondary roads (48 transects). Mean estimated density for Fork-tailed Flycatcher was 0.132 ind/ha, increased in the agricultural sub-region and was associated with decreasing forest cover and increasing fallow and weedy fields cover. Mean density of the White-browed Blackbird was 0.045 ind/ha, decreased in the agricultural-rangeland sub-region and increased in landscapes with more perennial pastures, fallow and weedy fields and annual pastures, avoiding sites with more forest cover. Productivity and climatic variables only showed a strong association with White-browed Blackbird density. Our results suggest that land use/cover, productivity and climatic factors are important variables when planning strategies to conserve bird population at a regional level in agroecosystems of Argentina. |
| format | info:ar-repo/semantics/artículo |
| id | INTA4134 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | Aves Argentinas/Asociación Ornitológica del Plata |
| publisherStr | Aves Argentinas/Asociación Ornitológica del Plata |
| record_format | dspace |
| spelling | INTA41342018-12-21T13:06:35Z Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina Calamari, Noelia Cecilia Cerezo, Alexis Canavelli, Sonia Beatriz Dardanelli, Sebastian Gavier Pizarro, Gregorio Ignacio Zaccagnini, Maria Elena Agroecosistemas Clima Pájaros Utilización de la Tierra Lluvia Agroecosystems Climate Birds Land Use Rain Tyrannus savana Sturnella superciliaris Aves Argentina Agricultural expansion and intensification resulted in important changes in the agricultural landscape of the Pampas region, Argentina. We used linear mixed models to analyze the relationship between environmental variables associated to land use/cover, productivity and climate and changes in densities of two bird species, the Fork-tailed Flycatcher (Tyrannus savana) and the White-browed Blackbird (Sturnella superciliaris). The study area in central Argentina was divided in three agroproductive sub-regions: (1) predominantly agricultural, (2) mixed agricultural- rangeland and (3) mixed agricultural-forested rangeland. Bird populations were sampled annually during 2003-2011 using point-transects along secondary roads (48 transects). Mean estimated density for Fork-tailed Flycatcher was 0.132 ind/ha, increased in the agricultural sub-region and was associated with decreasing forest cover and increasing fallow and weedy fields cover. Mean density of the White-browed Blackbird was 0.045 ind/ha, decreased in the agricultural-rangeland sub-region and increased in landscapes with more perennial pastures, fallow and weedy fields and annual pastures, avoiding sites with more forest cover. Productivity and climatic variables only showed a strong association with White-browed Blackbird density. Our results suggest that land use/cover, productivity and climatic factors are important variables when planning strategies to conserve bird population at a regional level in agroecosystems of Argentina. La expansión e intensificación agrícolas resultaron en importantes cambios en el paisaje agrícola de la Región Pampeana Argentina. Se utilizaron modelos lineales generalizados mixtos para analizar la relación entre la densidad de dos especies de aves, la Tijereta (Tyrannus savana) y el Pecho Colorado (Sturnella superciliaris), y variables ambientales asociadas a la cobertura, los usos de la tierra, la productividad vegetal y las condiciones climáticas. El área de estudio en la región central de Argentina se dividió en tres subregiones: (1) predominantemente agrícola, (2) agrícola-ganadera y (3) agrícola-ganadera bajo bosque nativo. Las aves fueron muestreadas anualmente durante 2003-2011 en 48 transectas de puntos localizadas en caminos secundarios. La densidad promedio de la Tijereta fue de 0.132 ind/ha, se incrementó significativamente en la subregión agrícola, y estuvo asociada a la disminución en la cobertura de bosque y al incremento en la proporción de cobertura de rastrojo y campo en descanso. La densidad del Pecho Colorado fue de 0.045 ind/ha, decreció en la subregión agrícola-ganadera y se incrementó en paisajes con mayor proporción de pasturas perennes, cobertura de rastrojo, campos en descanso y pasturas anuales, evitando sitios con mayor cobertura de bosque. La productividad y las variables climáticas solamente mostraron una asociación fuerte con la densidad del Pecho Colorado. Nuestros resultados sugieren que la cobertura de usos de la tierra, la productividad y los factores climáticos son importantes al planificar estrategias de conservación de aves a escala regional en los agroecosistemas de Argentina. EEA Paraná Fil: Calamari, Noelia Cecilia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina Fil: Cerezo, Alexis. Fundación para la Conservación y el Ecodesarrollo; Guatemala Fil: Canavelli, Sonia Beatriz. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina Fil: Dardanelli, Sebastian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; Argentina Fil: Gavier Pizarro, Gregorio Ignacio. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina Fil: Zaccagnini, Maria Elena. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina 2018-12-21T13:03:09Z 2018-12-21T13:03:09Z 2016-12 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://www.scielo.org.ar/pdf/hornero/v31n2/v31n2a05.pdf http://hdl.handle.net/20.500.12123/4134 0073-3407 1850-4884 eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf Aves Argentinas/Asociación Ornitológica del Plata Hornero 31 (2) : 97-112 (dic. 2016) |
| spellingShingle | Agroecosistemas Clima Pájaros Utilización de la Tierra Lluvia Agroecosystems Climate Birds Land Use Rain Tyrannus savana Sturnella superciliaris Aves Argentina Calamari, Noelia Cecilia Cerezo, Alexis Canavelli, Sonia Beatriz Dardanelli, Sebastian Gavier Pizarro, Gregorio Ignacio Zaccagnini, Maria Elena Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina |
| title | Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina |
| title_full | Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina |
| title_fullStr | Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina |
| title_full_unstemmed | Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina |
| title_short | Long-term association of Tyrannus savana and Sturnella superciliaris density with land cover and climatic variables in agroecosystems of Argentina |
| title_sort | long term association of tyrannus savana and sturnella superciliaris density with land cover and climatic variables in agroecosystems of argentina |
| topic | Agroecosistemas Clima Pájaros Utilización de la Tierra Lluvia Agroecosystems Climate Birds Land Use Rain Tyrannus savana Sturnella superciliaris Aves Argentina |
| url | http://www.scielo.org.ar/pdf/hornero/v31n2/v31n2a05.pdf http://hdl.handle.net/20.500.12123/4134 |
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