Seabird colonies at breeding sites are highly sensitive to human disturbance, with even brief disturbances causing nest abandonment, egg and chick exposure, and predation that cause direct welfare harm.
Disturbance at seabird colonies causes immediate and lasting welfare harm. Flushed adults leave eggs and chicks exposed to predation, cold, and rain. Guillemots nesting on narrow ledges may knock eggs or chicks into the sea during panic flushes. Repeated disturbance causes breeding pairs to abandon otherwise viable nest sites. The cumulative effect of visitor pressure at popular coastal sites can exceed the tolerance threshold of adjacent colonies, causing productivity collapse over years. Drone operators who fly near colonies may be committing wildlife crime in addition to causing welfare harm.