Wild Bird Nutrition in a Changing World: Dietary Ecology, Seasonal Nutrient Demands and Conservation Implications

Author

Dr. Rajwardhan Chandrakant Nimbalkar, Dr. Yogeshwar Rajendra Nimbalkar, Dr. Vaibhav Pandurang Kharade

Abstract

  Nutrition is a central link between wild birds and the habitats on which their survival, reproduction, moult and migration depend. Bird species exploit diverse foods—including seeds, fruits, nectar, invertebrates, fish and vertebrate prey—and differ in how they acquire and process nutrients. Food quality and availability vary across seasons and landscapes, while habitat conversion, climate variability, pesticide exposure and urban food subsidies can alter diets. This review considers dietary guilds, seasonal nutritional demands, foraging ecology, gut microbiome research, contaminants and the opportunities and risks associated with supplementary feeding. Human-provided food may be useful in specific conservation or emergency contexts, but it can also provide unbalanced nutrients, concentrate birds and increase exposure to pathogens or contaminants. The nutritional consequences are species- and context-specific, so conservation interventions should be based on ecological evidence rather than a general assumption that more food is always beneficial. Research on wild avian microbiomes is expanding, yet causal links among diet, microbial function, body condition and reproductive success remain limited compared with domestic poultry. The Indian context includes wetlands, grasslands, forests, urban settlements and agricultural mosaics, each supporting different food webs and conservation priorities. Future work should combine dietary analysis, habitat assessment, non-invasive condition measures and demographic monitoring. Conservation nutrition can strengthen management when it protects natural food resources, identifies seasonal bottlenecks and evaluates interventions for both intended benefits and unintended ecological effects.

Keywords

Wild bird nutrition; nutritional ecology; dietary guilds; migration; gut microbiome; supplementary feeding; conservation; India

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References

Davies, S., & Deviche, P. (2014). At the crossroads of physiology and ecology: Food supply and the timing of avian reproduction. Hormones and Behavior, 66(1), 41–55. https://doi.org/10.1016/j.yhbeh.2014.04.003

Dunbar, E.M., et al. (2024). Impacts of coprophagic foraging behaviour on the avian gut microbiome. Biological Reviews, 99(2), 582–597. https://doi.org/10.1111/brv.13036

McWilliams, S.R., Guglielmo, C., Pierce, B., & Klaassen, M. (2004). Flying, fasting, and feeding in birds during migration: A nutritional and physiological ecology perspective. Journal of Avian Biology, 35(5), 377–393. https://doi.org/10.1111/j.0908-8857.2004.03378.x

Murray, M.H., Becker, D.J., Hall, R.J., & Hernandez, S.M. (2016). Wildlife health and supplemental feeding: A review and management recommendations. Biological Conservation, 204, 163–174. https://doi.org/10.1016/j.biocon.2016.10.034

Ottinger, M.A., Mani, S., Krüger, S., Coverdale, B., Willows-Munro, S., & Combrink, L. (2024). Microbiomes in birds: A review of links to health and reproduction. Reproduction and Fertility, 5(3), e230076. https://doi.org/10.1530/RAF-23-0076

Robb, G.N., McDonald, R.A., Chamberlain, D.E., & Bearhop, S. (2008). Food for thought: Supplementary feeding as a driver of ecological change in avian populations. Frontiers in Ecology and the Environment, 6(9), 476–484. https://doi.org/10.1890/060152

Rosenberg, K.V., Dokter, A.M., Blancher, P.J., Sauer, J.R., Smith, A.C., Smith, P.A., Stanton, J.C., Panjabi, A., Helft, L., Parr, M., & Marra, P.P. (2019). Decline of the North American avifauna. Science, 366(6461), 120–124. https://doi.org/10.1126/science.aaw1313

Sekercioglu, C.H. (2006). Increasing awareness of avian ecological function. Trends in Ecology & Evolution, 21(8), 464–471. https://doi.org/10.1016/j.tree.2006.05.007

Twining, C.W., et al. (2023). The effect of insect food availability on songbird reproductive success and chick body condition: Evidence from a systematic review and meta-analysis. Ecology Letters. https://doi.org/10.1111/ele.14178

Uehling, J.J., & Houtz, J.L. (2025). Gut microbiome–diet interactions in wild birds. Journal of Avian Biology, 2025(5), e03456. https://doi.org/10.1002/jav.03456

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