​The presence of gulls, particularly the Ring-billed Gull, is a natural part of the Lake Achigan ecosystem. However, when populations grow too large, they can significantly impact water quality and the ecological balance of the lake.

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Why gull overpopulation matters?

High concentrations of gulls lead to an increase in droppings, which are rich in bacteria and nutrients such as phosphorus. This can:

• Reduce water quality

• Trigger algae and cyanobacteria blooms

• Make certain areas unsafe for swimming

• Affect the overall enjoyment of the lake

Human activity often contributes to this imbalance.

 

A Human-Influenced phenomenon

Gulls thrive in human-altered environments. Their growing numbers are commonly linked to:

• Easy access to food (garbage and food waste)

• Intentional feeding by people

• Structures like docks and rooftops that provide resting and nesting areas

• A lack of natural predators

These conditions encourage gulls to gather and reproduce near the lake.

 

Environmental Impact of Gull Concentration

Many gulls originate from islands along the St. Lawrence River and are attracted to nearby food sources, including the Waste Management landfill in Sainte-Sophie.

Lake Achigan, due to its size and proximity, becomes a preferred resting and overnight location. In the early 2000s, between 5,000 and 7,000 gulls were observed on the lake during evenings, especially in August and early September.

 

APLA’s Actions to Protect Water Quality

Since 2009, APLA has implemented effective gull deterrence measures, including the use of a Scare Cannon.

This device produces controlled noise between 4 p.m. and 8 p.m. to discourage gulls from settling on the lake. It is used alongside other deterrent techniques, such as flare devices.

 

Measurable Results Since 2009

Continuous efforts have led to a significant reduction in gull presence over the years. These actions help:

• Protect water quality

• Reduce phosphorus input

• Preserve the lake’s ecological balance

 

APLA also works to educate the community about the impacts of gull overpopulation, promotes responsible behaviors, and collaborates with local authorities to ensure sustainable management.

 

By working together, we can protect Lake Achigan while respecting its wildlife.

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