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Location Canada, New Brunswick
Central coordinates 66o 31.21' West  45o 5.56' North
IBA criteria A4i, A4iii
Area 3,000 ha
Altitude 0 - 10m
Year of IBA assessment 2008

Bird Studies Canada/Nature Canada

Site description Point Lepreau and Maces Bay are located along the northern coast of the Bay of Fundy, about 30 km southwest of Saint John. The point forms the eastern border of Maces Bay, Welch Cove, and Little Lepreau Basin, which make up the marine areas of the site. These marine areas contain intertidal reef ledges bordered by mud flats, and a few shallow inlets. Several islands are also present including New River Island, and The Brothers (Salkeld Islands). Intertidal reefs and waters extend about 10 km south from the point into the Bay of Fundy. The shoreline is low and rises gradually, with low cliffs and reefs exposed at low tide. The tidal range is 6 to 8 m (not as dramatic as the tides of the upper bay).

Key Biodiversity The intertidal ledges of Maces Bay are recognized as an important spring staging area for migrating Brant. As many as 2,000 birds have been recorded staging here, although the numbers recorded are generally in the range of 1,000 (about 1% of the estimated eastern North American ssp. hrota population).

Data collected during the late 1970s and early 1980s suggests that the site is especially important for Semipalmated Plovers (possibly as much as 6.6% of the world's estimated population) and Least Sandpipers (over 3% of the world's estimated population). Other shorebirds that concentrate at this site during the fall migration include Semipalmated Sandpiper, Short-billed Dowitcher, Black-bellied Plover, Sanderling, White-rumped Sandpiper, and Greater Yellowlegs. Large numbers of wintering Purple Sandpipers have also been recorded at this site with some estimates being in excess of 500 birds (just over 5% of the eastern North American wintering population.

In addition to this site's importance for staging geese and shorebirds, Point Lepreau functions as a major concentration point for thousands of migrating waterfowl that travel along the north coast of the Bay Fundy during the spring. Systematic coverage from April 11 to May 5, 1996 yielded the following estimates: Red-throated Loon (3,222); Common Eider (10,143); Oldsquaw (1,305); Black Scoter (35,037); Surf Scoter (15,389); and White-winged Scoter (617). In total, over 65,000 sea ducks migrated past the point, with the number of Black Scoters being particularly interesting (from 17.5 to possibly as much as 44% of the estimated eastern North American population). Wintering Harlequin Ducks from the eastern population (designated as nationally endangered) have also recorded at this site with estimates of ten or more birds being present.

The islands in Maces Bay (New River and The Brothers [Salkeld] islands) support a large colony of about 1,000 pairs of nesting Common Eider (just over 1% of the Atlantic ssp. dresseri population).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Melanitta nigra passage  1996  35,037 individuals  A4i  Not Recognised 
Surf Scoter Melanitta perspicillata passage  1996  15,389 individuals  A4i  Least Concern 
Red-throated Loon Gavia stellata passage  1996  3,222 individuals  A4i  Least Concern 
Semipalmated Plover Charadrius semipalmatus passage  1990  3,200 individuals  A4i  Least Concern 
Purple Sandpiper Calidris maritima winter  1974  525 individuals  A4i  Least Concern 
A4iii Species group - waterbirds passage  1996  50,000-99,999 individuals  unknown  A4iii   


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Estuarine waters; Intertidal mud, sand or salt flats  20%
Sea Open sea; Sea inlets  60%
Coastline Sea cliffs and rocky shores  20%

Land use

Land-use Extent (% of site)
nature conservation and research minor
fisheries/aquaculture minor
urban/industrial/transport major

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Point Lepreau/Maces Bay. Downloaded from on 28/10/2016

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