Puck Lagoon (Zatoka Pucka) is a shallow, semi-enclosed bay on the southern Baltic coast, separated from the open sea by the Hel Peninsula. Designated a Natura 2000 Special Protection Area (PLB220005), it supports both resident and migratory waterbirds year-round, with peak diversity during spring and autumn passage. The lagoon's low salinity, extensive mudflats, and proximity to coastal salt marshes make it one of the most significant wader stopover sites in northern Poland.

Key species recorded

The wader community at Puck Lagoon includes a combination of passage migrants, summer breeders, and winter visitors. The following species are regularly documented:

Habitat use and feeding ecology

Waders at Puck Lagoon concentrate on exposed mudflats during low-water periods, particularly in the inner lagoon (Wewnętrzna Zatoka Pucka) where depths rarely exceed two metres. The shallow areas east of Puck town and around the river outlets at Płutnica and Zagórska Struga provide consistently productive feeding areas throughout the passage season.

The relationship between wader use and saltmarsh vegetation is indirect but important. Salt marsh patches along the eastern shore provide roosting habitat during high-water periods, when mudflats are submerged. Dunlin and dunlin-sized waders regularly move between feeding mudflats and adjacent marsh vegetation to roost.

Coastal salt marsh with open water channels — similar habitat to Puck Lagoon margins
Coastal salt marsh with open water channels — representative of the habitat structure used for roosting at Puck Lagoon margins. Wikimedia Commons, CC BY.

Seasonal patterns

Spring passage at Puck Lagoon runs from late March through May. April is typically the most active month for larger waders including godwits, curlew sandpiper, and ruff. Dunlin and knot dominate the autumn passage from late July through October, with peak numbers in August–September. Winter brings smaller flocks of dunlin and curlew, which may remain as long as the lagoon remains ice-free.

Breeding activity within the Natura 2000 zone includes avocet, lapwing (Vanellus vanellus), and redshank (Tringa totanus). These species nest in damp meadow and salt-marsh transition zones along the lagoon margin, mostly in areas managed under agri-environment schemes.

Observation points and access

Several locations along the lagoon offer good observation conditions without disturbance to nesting or roosting birds:

Telescope or binoculars of 8x magnification minimum are practical given the distances involved at many sites. Visiting in the two hours around low water generally gives the best chance of seeing actively feeding birds.

Conservation status of the site

The Puck Lagoon Natura 2000 SPA was designated to protect populations of avocet, dunlin, ringed plover, and other waders dependent on the site. Pressures include disturbance from recreational boating and kite surfing, as well as nutrient loading from catchment runoff affecting benthic invertebrate communities that waders depend on for food. The General Directorate for Environmental Protection (GDOŚ) maintains site documentation and monitoring data through the national Natura 2000 reporting system.

Species records listed here are drawn from published ornithological surveys and Natura 2000 standard data forms. Individual counts and timing may vary between years. Always observe from marked paths and maintain distance from nesting areas.

References:
Natura 2000 Standard Data Form PLB220005: EEA Natura 2000 viewer
General Directorate for Environmental Protection: gdos.gov.pl
Polish Society for Bird Protection (OTOP): otop.org.pl