Limits...
Multi-Season Regional Analysis of Multi-Species Occupancy: Implications for Bird Conservation in Agricultural Lands in East-Central Argentina.

Goijman AP, Conroy MJ, Bernardos JN, Zaccagnini ME - PLoS ONE (2015)

Bottom Line: Rapid expansion and intensification of agriculture create challenges for the conservation of biodiversity and associated ecosystem services.Overall our results support the predictions.Continuation of the bird monitoring program will allow us to continue to inform for conservation of birds in agroecosystems, identify research needed to reduce key uncertainties, and anticipate the effects of changes in agriculture in central Argentina.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Recursos Biológicos, CIRN, Instituto Nacional de Tecnología Agropecuaria (INTA), Hurlingham, Buenos Aires, Argentina; D.B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA United States of America.

ABSTRACT
Rapid expansion and intensification of agriculture create challenges for the conservation of biodiversity and associated ecosystem services. In Argentina, the total row crop planted area has increased in recent decades with the expansion of soybean cultivation, homogenizing the landscape. In 2003 we started the first long-term, large-scale bird monitoring program in agroecosystems of central Argentina, in portions of the Pampas and Espinal ecoregions. Using data from this program, we evaluated the effect of land use and cover extent on birds between 2003-2012, accounting for imperfect detection probabilities using a Bayesian hierarchical, multi-species and multi-season occupancy model. We tested predictions that species diversity is positively related to habitat heterogeneity, which in intensified agroecosystems is thought to be mediated by food availability; thus the extent of land use and cover is predicted to affect foraging guilds differently. We also infer about ecosystem services provisioning and inform management recommendations for conservation of birds. Overall our results support the predictions. Although many species within each guild responded differently to land use and native forest cover, we identified generalities for most trophic guilds. For example, granivorous gleaners, ground insectivores and omnivores responded negatively to high proportions of soybean, while insectivore gleaners and aerial foragers seemed more tolerant. Habitat heterogeneity would likely benefit most species in an intensified agroecosystem, and can be achieved with a diversity of crops, pastures, and natural areas within the landscape. Although most studied species are insectivores, potentially beneficial for pest control, some guilds such as ground insectivores are poorly represented, suggesting that agricultural intensification reduces ecological functions, which may be recovered through management. Continuation of the bird monitoring program will allow us to continue to inform for conservation of birds in agroecosystems, identify research needed to reduce key uncertainties, and anticipate the effects of changes in agriculture in central Argentina.

No MeSH data available.


Related in: MedlinePlus

Picazuro Pigeon Patagioenas picazuro occupancy () in the regional bird monitoring area in Argentina.Occupancy of the species is represented for (a) 2003, (b) 2006, (c) 2009, (d) 2012.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4472512&req=5

pone.0130874.g008: Picazuro Pigeon Patagioenas picazuro occupancy () in the regional bird monitoring area in Argentina.Occupancy of the species is represented for (a) 2003, (b) 2006, (c) 2009, (d) 2012.

Mentions: In order to exemplify the potential application of our models to conservation, we illustrate the spatial response over time for a species of potential conservation concern (Vermilion flycatcher) and for a species of potential pest management concern (Picazuro pigeon) by evaluating their spatial distribution of occupancy probability throughout the region as it in relates to LULC. Picazuro pigeon is positively affected by soybean and negatively by native forests (Figs 6c and 7c); and the Vermilion flycatcher is negatively affected by soybean (Figs 6f and 7f). Occupancy probabilities of the Picazuro pigeon increase over most of the study area. However, they remain high in the central part where there is a higher proportion of soybean, and low in areas with natural forests (Fig 8). Conversely, the Vermilion flycatcher has a patchy distribution, with higher occupancy probabilities in the north and south west of the study area, where soybean proportions are lower. The response of this species over time does not appear to follow a clear trend, with some areas increasing and other decreasing in different years (Fig 9).


Multi-Season Regional Analysis of Multi-Species Occupancy: Implications for Bird Conservation in Agricultural Lands in East-Central Argentina.

Goijman AP, Conroy MJ, Bernardos JN, Zaccagnini ME - PLoS ONE (2015)

Picazuro Pigeon Patagioenas picazuro occupancy () in the regional bird monitoring area in Argentina.Occupancy of the species is represented for (a) 2003, (b) 2006, (c) 2009, (d) 2012.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4472512&req=5

pone.0130874.g008: Picazuro Pigeon Patagioenas picazuro occupancy () in the regional bird monitoring area in Argentina.Occupancy of the species is represented for (a) 2003, (b) 2006, (c) 2009, (d) 2012.
Mentions: In order to exemplify the potential application of our models to conservation, we illustrate the spatial response over time for a species of potential conservation concern (Vermilion flycatcher) and for a species of potential pest management concern (Picazuro pigeon) by evaluating their spatial distribution of occupancy probability throughout the region as it in relates to LULC. Picazuro pigeon is positively affected by soybean and negatively by native forests (Figs 6c and 7c); and the Vermilion flycatcher is negatively affected by soybean (Figs 6f and 7f). Occupancy probabilities of the Picazuro pigeon increase over most of the study area. However, they remain high in the central part where there is a higher proportion of soybean, and low in areas with natural forests (Fig 8). Conversely, the Vermilion flycatcher has a patchy distribution, with higher occupancy probabilities in the north and south west of the study area, where soybean proportions are lower. The response of this species over time does not appear to follow a clear trend, with some areas increasing and other decreasing in different years (Fig 9).

Bottom Line: Rapid expansion and intensification of agriculture create challenges for the conservation of biodiversity and associated ecosystem services.Overall our results support the predictions.Continuation of the bird monitoring program will allow us to continue to inform for conservation of birds in agroecosystems, identify research needed to reduce key uncertainties, and anticipate the effects of changes in agriculture in central Argentina.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Recursos Biológicos, CIRN, Instituto Nacional de Tecnología Agropecuaria (INTA), Hurlingham, Buenos Aires, Argentina; D.B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA United States of America.

ABSTRACT
Rapid expansion and intensification of agriculture create challenges for the conservation of biodiversity and associated ecosystem services. In Argentina, the total row crop planted area has increased in recent decades with the expansion of soybean cultivation, homogenizing the landscape. In 2003 we started the first long-term, large-scale bird monitoring program in agroecosystems of central Argentina, in portions of the Pampas and Espinal ecoregions. Using data from this program, we evaluated the effect of land use and cover extent on birds between 2003-2012, accounting for imperfect detection probabilities using a Bayesian hierarchical, multi-species and multi-season occupancy model. We tested predictions that species diversity is positively related to habitat heterogeneity, which in intensified agroecosystems is thought to be mediated by food availability; thus the extent of land use and cover is predicted to affect foraging guilds differently. We also infer about ecosystem services provisioning and inform management recommendations for conservation of birds. Overall our results support the predictions. Although many species within each guild responded differently to land use and native forest cover, we identified generalities for most trophic guilds. For example, granivorous gleaners, ground insectivores and omnivores responded negatively to high proportions of soybean, while insectivore gleaners and aerial foragers seemed more tolerant. Habitat heterogeneity would likely benefit most species in an intensified agroecosystem, and can be achieved with a diversity of crops, pastures, and natural areas within the landscape. Although most studied species are insectivores, potentially beneficial for pest control, some guilds such as ground insectivores are poorly represented, suggesting that agricultural intensification reduces ecological functions, which may be recovered through management. Continuation of the bird monitoring program will allow us to continue to inform for conservation of birds in agroecosystems, identify research needed to reduce key uncertainties, and anticipate the effects of changes in agriculture in central Argentina.

No MeSH data available.


Related in: MedlinePlus