Bird droppings quietly fertilize ecosystems across the entire planet
Duvall ES, Abraham AJ, Bellvé A, Doughty CE, Rodewald AD
Soil Health
The songbirds and seabirds visiting your yard or coastline aren't just scenery, their droppings deliver nitrogen and phosphorus that can boost nearby plant growth, and fewer birds means weaker natural fertilizer cycles for the soil under your feet.
Birds carry nutrients from one place to another just by eating, flying, and pooping. A seabird colony can turn a rocky island green with extra nitrogen, while a flock of geese can shift what grows in a wetland. As bird numbers drop around the world, we're quietly losing a natural fertilizing and recycling system that plants, soil microbes, and even other animals have relied on for ages.
Key Findings
Birds transport nitrogen and phosphorus between ecosystems through guano, carcasses, and feathers, boosting primary productivity and plant nutrient content in recipient habitats
Research has focused heavily on waterbirds, but birds also measurably alter soil chemistry, microbial communities, and plant and animal populations across diverse land and marine environments
Bird-delivered nutrients carry tradeoffs: they can also drive soil acidification, contaminant buildup, plant damage, and eutrophication, while human-driven declines in bird abundance and movement are weakening these nutrient cycles globally
chevron_right Technical Summary
Birds move nutrients like nitrogen and phosphorus across land and sea through their droppings, bodies, and migrations, shaping plant growth and soil chemistry worldwide. As bird populations shrink, these invisible nutrient delivery services are breaking down, with ripple effects on ecosystems everywhere.
Abstract Preview
Original paper
Birds shape biogeochemistry and ecosystem function globally.
Birds inhabit nearly every environment on Earth, shaping ecosystems through diverse functions that include contributions to biogeochemical cycles. By transporting and recycling nutrients, birds inf...
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