Trophic ecology of the Ringed Warbling-Finch (Poospiza torquata) in Neotropical semi-arid scrublands
Rocío Sánchez A C and Pedro G. Blendinger A B
+ Author Affiliations
- Author Affiliations
A Instituto de Ecología Regional, Universidad Nacional de Tucumán, CC 34, 4107 Yerba Buena, Tucumán, Argentina.
B Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Crisóstomo Álvarez 722, 4000 San Miguel de Tucumán, Tucumán, Argentina.
C Corresponding author. Email: rociospp@gmail.com
Emu 114(3) 229-233 https://doi.org/10.1071/MU13082
Submitted: 12 March 2013 Accepted: 9 December 2013 Published: 7 April 2014
Abstract
Seed-eating birds in temperate deserts must cope with great variation in the availability of their food resources. We studied the trophic ecology of Ringed Warbling-Finches (Poospiza torquata) in semi-arid scrublands of the Monte Desert, Argentina. We assessed seasonality in the availability of seed and in the consumption of arthropods and seeds at a regional scale, and evaluated the composition of the granivorous component of the diet and the seed dietary breadth. Ringed Warbling-Finches had a granivorous–insectivorous diet consisting largely of arthropods in summer and seeds and arthropods in winter. The granivorous component of the diet consisted mainly of grass seeds, but with low breadth of the winter seed diet. To deal with seasonal variation in the availability of food resources, Ringed Warbling-Finches switched opportunistically between different resources, exploiting alternating seasonal patterns of food abundance. This seasonal switching is a well-established strategy in the behaviour of the species and was observed in all Ringed Warbling-Finch populations studied across the Monte Desert. Our results show the flexibility of foraging strategies of Ringed Warbling-Finches, an opportunist species that adjusts their relative consumption of seeds and arthropods in response to the spatial and temporal variations in these food resources.
Additional keywords: dietary switch, granivory, Monte Desert, resource channels, seed-eating birds.
References
Abraham, E., del Valle, H. F., Roig, F., Torres, L., Ares, J. O., Coronato, F., and Godagnone, R. (2009). Overview of the geography of the Monte Desert biome (Argentina). Journal of Arid Environments 73, 144–153.| Overview of the geography of the Monte Desert biome (Argentina).Crossref | GoogleScholarGoogle Scholar |
Blendinger, P. G. (2005a). Abundance and diversity of small-bird assemblages in the Monte desert, Argentina. Journal of Arid Environments 61, 567–587.
| Abundance and diversity of small-bird assemblages in the Monte desert, Argentina.Crossref | GoogleScholarGoogle Scholar |
Blendinger, P. G. (2005b). Foraging behaviour of birds in an arid sand-dune scrubland in Argentina. Emu 105, 67–79.
| Foraging behaviour of birds in an arid sand-dune scrubland in Argentina.Crossref | GoogleScholarGoogle Scholar |
Blendinger, P. G., and Ojeda, R. A. (2001). Seed supply as a limiting factor for granivorous birds in the Monte desert, Argentina. Austral Ecology 26, 413–422.
| Seed supply as a limiting factor for granivorous birds in the Monte desert, Argentina.Crossref | GoogleScholarGoogle Scholar |
Burbidge, A. A., and Fuller, P. J. (2007). Gibson Desert birds: responses to drought and plenty. Emu 107, 126–134.
| Gibson Desert birds: responses to drought and plenty.Crossref | GoogleScholarGoogle Scholar |
Carnicer, J., Abrams, P. A., and Jordano, P. (2008). Switching behavior, coexistence and diversification: comparing community-wide evidence with theoretical predictions. Ecology Letters 11, 802–808.
| Switching behavior, coexistence and diversification: comparing community-wide evidence with theoretical predictions.Crossref | GoogleScholarGoogle Scholar | 18445033PubMed |
Cueto, V. R., Marone, L., and Lopez de Casenave, J. (2006). Seed preferences in sparrow species of the Monte desert: implications for seed–granivore interactions. Auk 123, 358–367.
| Seed preferences in sparrow species of the Monte desert: implications for seed–granivore interactions.Crossref | GoogleScholarGoogle Scholar |
Dean, W. R. J., and Milton, S. J. (2001). Responses of birds to rainfall and seed abundance in the southern Karoo, South Africa. Journal of Arid Environments 47, 101–121.
| Responses of birds to rainfall and seed abundance in the southern Karoo, South Africa.Crossref | GoogleScholarGoogle Scholar |
Díaz, M. (1996). Food choice by seed-eating birds in relation to seed chemistry. Comparative Biochemistry and Physiology. A. Comparative Physiology 113, 239–246.
| Food choice by seed-eating birds in relation to seed chemistry.Crossref | GoogleScholarGoogle Scholar |
Facelli, J. M., Chesson, P., and Barnes, N. (2005). Differences in seed biology of annual plants in arid lands: a key ingredient of the storage effect. Ecology 86, 2998–3006.
| Differences in seed biology of annual plants in arid lands: a key ingredient of the storage effect.Crossref | GoogleScholarGoogle Scholar |
Flores, G. E., Lagos, S. J., and Roig Juñent, S. (2004). Artrópodos epígeos que viven bajo la copa del algarrobo (Prosopis flexuosa) en la Reserva Telteca (Mendoza, Argentina). Multequina 13, 71–90.
Gutiérrez, J. R., Arancio, G., and Jaksic, F. M. (2000). Variation in vegetation and seed bank in a Chilean semi-arid community affected by ENSO 1997. Journal of Vegetation Science 11, 641–648.
| Variation in vegetation and seed bank in a Chilean semi-arid community affected by ENSO 1997.Crossref | GoogleScholarGoogle Scholar |
Holland, J. M., Hutchison, M. A. S., Smith, B. M., and Aebischer, N. J. (2006). A review of invertebrates and seed-bearing plants as food for farmland birds in Europe. Annals of Applied Biology 148, 49–71.
| A review of invertebrates and seed-bearing plants as food for farmland birds in Europe.Crossref | GoogleScholarGoogle Scholar |
Krebs, C. (1989). ‘Ecological Methodology.’ (Harper and Row: New York.)
LeHouérou, H. N., Bingham, R. L., and Skerbek, W. (1988). Relationships between the variability of primary production and the variability of annual precipitation in world arid lands. Journal of Arid Environments 15, 1–18.
Lopez de Casenave, J., Cueto, V. R., and Marone, L. (2008). Seasonal dynamics of guild structure in a bird assemblage of the central Monte desert. Basic and Applied Ecology 9, 78–90.
| Seasonal dynamics of guild structure in a bird assemblage of the central Monte desert.Crossref | GoogleScholarGoogle Scholar |
Marone, L., Horno, M. E., and González del Solar, R. (2000). Post-dispersal fate of seeds in the Monte desert of Argentina: patterns of germination in successive wet and dry years. Journal of Ecology 88, 940–949.
| Post-dispersal fate of seeds in the Monte desert of Argentina: patterns of germination in successive wet and dry years.Crossref | GoogleScholarGoogle Scholar |
Marone, L., Lopez de Casenave, J., Milesi, F. A., and Cueto, V. R. (2008). Can seed-eating birds exert top-down effects on grasses of the Monte desert? Oikos 117, 611–619.
| Can seed-eating birds exert top-down effects on grasses of the Monte desert?Crossref | GoogleScholarGoogle Scholar |
McWilliams, S. R., and Karasov, W. H. (2001). Phenotypic flexibility in digestive system structure and function in migratory birds and its ecological significance. Comparative Biochemistry and Physiology – A. Molecular & Integrative Physiology 128, 579–593.
| 1:STN:280:DC%2BD3MzmvVOrtg%3D%3D&md5=5bbc7487275c96a45efbc09f7962ef76CAS |
Milesi, F. A., Lopez de Casenave, J., and Cueto, V. R. (2008). Selection of foraging sites by desert granivorous birds: vegetation structure, seed availability, species-specific foraging tactics, and spatial scale. Auk 125, 473–484.
| Selection of foraging sites by desert granivorous birds: vegetation structure, seed availability, species-specific foraging tactics, and spatial scale.Crossref | GoogleScholarGoogle Scholar |
Parrish, J. D. (2000). Behavioral, energetic, and conservation implications of foraging plasticity during migration. Studies in Avian Biology 20, 53–70.
Podlesak, D. W., McWilliams, S. R., and Hatch, K. A. (2005). Stable isotopes in breath, blood, feces and feathers can indicate intra-individual changes in the diet of migratory songbirds. Oecologia 142, 501–510.
| Stable isotopes in breath, blood, feces and feathers can indicate intra-individual changes in the diet of migratory songbirds.Crossref | GoogleScholarGoogle Scholar | 15586297PubMed |
Reichman, O. J. (1984). Spatial and temporal variation of seed distribution in Sonoran Desert soils. Journal of Biogeography 11, 1–11.
| Spatial and temporal variation of seed distribution in Sonoran Desert soils.Crossref | GoogleScholarGoogle Scholar |
Ridgely, R., and Tudor, G. (1994). ‘The Birds of South America. Vol. 2. The Suboscine Passerines.’ (University of Texas Press: Austin, Texas.)
Ríos, J. M., Mangione, A., and Marone, L. (2012). Effects of nutritional and anti-nutritional properties of seeds on the feeding ecology of seed-eating birds of the Monte desert, Argentina. Condor 114, 44–55.
| Effects of nutritional and anti-nutritional properties of seeds on the feeding ecology of seed-eating birds of the Monte desert, Argentina.Crossref | GoogleScholarGoogle Scholar |
Rosenberg, K. V., and Cooper, R. J. (1990). Approaches to avian diet analysis. Studies in Avian Biology 13, 80–90.
Sánchez, R., Blendinger, P. G., Moyano Wagner, E., and Martín, E. (2013). Hierarchical habitat selection and reproductive success of the Ringed Warbling-Finch in Chaco woodlands. Condor 115, 893–901.
| Hierarchical habitat selection and reproductive success of the Ringed Warbling-Finch in Chaco woodlands.Crossref | GoogleScholarGoogle Scholar |