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House sparrow decline linked to air pollution and poor diet

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October 3, 2017 Frontiers  read full ScienceDaily article here

House sparrows are well-adapted to living in urban areas, so it is surprising their numbers have fallen significantly over the past decades. An investigation into this worrying trend finds that sparrows living in urban areas are adversely affected by pollution and poor nutrition. The study also finds the birds suffer more during the breeding season, when resources are needed to produce healthy eggs….

…if our cities are unhealthy for birds, which is what our study is suggesting, then as their neighbors we should be concerned because we are exposed to the same environmental stressors as house sparrows.”

…”We took a small blood sample from each bird, according to its weight and physical condition, and released them unharmed,” she explains. The samples were analyzed for signs of oxidative stress, which can be used to measure how much an environmental stressor, such as pollution, is weakening the bird’s natural defenses….

…”We need to work hard to improve the quality of the urban environment, for example, air quality and the design of green areas. Even the leftovers that we throw in the bin at the park should encourage us to reflect on ourselves: more nuts and fruit and fewer chips and cookies would be better for humans as well as for birds,” Herrera-Dueñas advises.

Amparo Herrera-Dueñas, Javier Pineda-Pampliega, María T. Antonio-García, José I. Aguirre. The Influence of Urban Environments on Oxidative Stress Balance: A Case Study on the House Sparrow in the Iberian Peninsula. Frontiers in Ecology and Evolution, 2017; 5 DOI: 10.3389/fevo.2017.00106

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