Affiliation:
1. Laboratorio de Biología de la Conservación, Centro de Ecología Aplicada del Litoral (CECOAL-CONICET), Corrientes, Argentina
2. Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado, USA
Abstract
Abstract
Subtropical grasslands are highly susceptible to habitat conversion and number among South America’s most threatened ecosystems. The grasslands of northeastern Argentina have been identified as a priority conservation area for threatened capuchino seedeaters because they constitute the main breeding area of these migratory birds. The Iberá Seedeater (Sporophila iberaensis) is a newly described species in the Iberá Wetlands in Argentina whose biology is still poorly understood. The endangered species inhabits grasslands but has only been reported to breed in the Iberá Wetlands ecoregion of northeastern Argentina. To explore the species’ association with grassland vegetation, we studied the breeding biology (clutch size, hatching success, and fledgling production) of the Iberá Seedeater and the main parameters that influence nest survival and nest-site selection. We conducted nest searches and banded adults and nestlings in Iberá National Park during the breeding seasons of 2016–2018. The breeding season of the Iberá Seedeater was highly synchronous and the cumulative probability of nest survival was 0.16. The daily nest survival rate decreased as the breeding season advanced, survival was lower for nests supported by Rhynchospora corymbosa than Paspalum durifolium, the two main nest substrates, and the main causes of nest failure were nest predation and strong winds. Additionally, the population exhibited male-biased site fidelity and a low female return rate. In contrast to other capuchinos, whose breeding biology is associated with upland grasslands, the Iberá Seedeater nested exclusively in flooded lowland grasslands on marsh plants. Thus, effective lowland grassland management is key to maintain the vegetation structure required for reproduction in the Iberá Seedeater.
Funder
Neotropical Grassland Conservancy
Agencia Nacional de Promoción Científica y Tecnológica
CONICET
University of Colorado Boulder
Association of Field Ornithologists
National Geographic Society
British Ornithologists’ Union
American Ornithological Society
American Philosophical Society
Publisher
Oxford University Press (OUP)
Subject
Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics
Reference76 articles.
1. Nest-site selection by Blue-black Grassquits in a Neotropical savanna: do choices influence nest success?;Aguilar;Journal of Field Ornithology,2008
2. Ecology and conservation of grassland birds in southeastern South America: a review;Azpiroz;Journal of Field Ornithology,2012
3. Climate change in Argentina: trends, projections, impacts and adaptation;Barros;Wiley Interdisciplinary Reviews: Climate Change,2015
4. Fitting linear mixed-effects models using lme4;Bates;Journal of Statistical Software,2015
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