Impact of Urbanization on Foraging Behavior of Common Urban Birds

Thesis Abstract

Urbanization has significantly transformed natural habitats, leading to alterations in the behavioral ecology of avian species residing within urban environments. This study addresses the critical gap in understanding how varying degrees of urban development influence the foraging behavior of common urban birds, specifically targeting species such as the House Sparrow (Passer domesticus), Rock Pigeon (Columba livia), and European Starling (Sturnus vulgaris). The primary aim is to empirically assess the relationship between urbanization intensity and changes in foraging strategies, dietary diversity, and activity patterns among these species. The study employs a quantitative, cross-sectional research design within three distinct zones characterized by low, medium, and high levels of urban development in the metropolitan area of the city. The population comprises the selected bird species within these zones, with a total sample size of 150 individual birds, evenly distributed across the three urbanization strata (50 per zone). A stratified random sampling technique ensures representative sampling within each zone. Data collection involves direct field observations, utilizing standardized focal animal sampling methods over a six-month period to record foraging modes (ground foraging, canopy foraging, etc.), diet composition (via fecal analysis and visual identification of foraged items), and activity periods (diurnal, crepuscular, nocturnal). Supplementary data are obtained through structured habitat assessments and urbanization metrics, including built-up density, green space coverage, and human activity levels. To analyze the data, descriptive statistics summarize behavioral patterns, while inferential analyses—including ANOVA and multiple regression—test the effects of urbanization levels on foraging behavior metrics. The study also applies the Ethological Theory of Foraging, alongside the Optimal Foraging Theory, to interpret behavioral adaptations in response to urban environmental variables. Expected findings suggest that increased urbanization correlates with notable shifts in foraging behavior, such as increased reliance on anthropogenic food sources, reduced dietary diversity, and altered activity rhythms, with birds in highly urbanized zones exhibiting more opportunistic and risk-prone behaviors. These behavioral modifications potentially reflect adaptive strategies to urban stresses but may influence overall fitness and survival. The research contributes novel empirical evidence to the limited body of knowledge on urban avian ecology, providing insights into behavioral plasticity and resilience in changing environments. Conclusively, the findings indicate that urbanization significantly impacts the foraging ecology of common city-dwelling birds, emphasizing the importance of habitat heterogeneity and green space preservation in urban planning. Recommendations include integrating wildlife-friendly designs into urban development policies and promoting habitat corridors that support diverse foraging opportunities. The study advocates for further longitudinal research to examine the long-term effects of urbanization on avian populations and their ecological functions within city ecosystems. Overall, the research underscores the necessity for informed urban biodiversity management to mitigate adverse impacts and foster sustainable coexistence between humans and urban wildlife.