Invasive Species – Geese


Ecological Disturbances

Canada Geese, while being resident to N.A. are known to become invasive and destructive when left unchecked. Due to human lead introduction of Geese populations around N.A., for the purpose of providing hunting opportunities in the early 1900s, we now see ever-growing flocks of resident geese populations. These flocks while left unchecked are known to cause major ecological disturbances and so called Trophic Cascades.

Effect on Tidal Zone

Destruction of Habitat

Many studies have shown that the feeding activities of geese is detrimental to shellfish populations. Tidal zone foraging of geese disturbs clam, oyster and mussel beds, exposing young spat to the elements and to predators. Making them more susceptible to poor water quality and heat. 

Water Quality

Goose Droppings.

A little-known fact about the feeding activity of Canada Geese is their ability to consume vast amounts of grass in a short amount of time. One goose can consume up to 4 pounds (1.8kg) of grass per day, and defecate up to 2 pounds (0.9kg) per day, defecating up to every 12 minutes.
Geese also tend to feed on well-fertilized lawns, and through their activity in water and on land, nearby water sources can quickly become oversaturated with nutrients, leading to eutrophication and in turn algae blooms, E-Coli outbreaks, and oxygen starvation of the water source.


Giardia, E-Coli, Avian Flu..

Not only does Canada Geese defecate insurmountable amounts, but they are also well-known disease vectors. E-Coli, Giardia, Avian Flu, and antibiotic-resistant superbugs are just the proverbial tip of the iceberg. This puts local residents and animals at high risk of catching nasty diseases that can quickly spread throughout society.


Read scientifc reports regarding the impact of invasive geese on ecosystems and marine species.


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Estimated Geese Population

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