The Canadian Wildlife Service (CWS) Prince Edward Island Waterfowl Survey used helicopters to survey breeding waterfowl on square 2x2 km (4 km²) plots in 2016 on Prince Edward Island (PE). The objective of the survey was to establish baseline information about breeding season abundances and distributions of waterfowl on PE, and also to inform the design of potential future surveys in the province. Complete bilingual metadata including detailed survey design, survey protocols and data dictionaries is available in downloadable files.

The distribution of unspecified waterfowl habitat in coastal British Columbia showing relative abundance (RA) by season and overall relative importance (RI). RI is based on project region and not on the province as a whole. CRIMS is a legacy dataset of BC coastal resource data that was acquired in a systematic and synoptic manner from 1979 and was intermittently updated throughout the years. Resource information was collected in nine study areas using a peer-reviewed provincial Resource Information Standards Committee consisting of DFO Fishery Officers, First Nations, and other subject matter experts. There are currently no plans to update this legacy data.

The Canadian Wildlife Service (CWS) Northern Ontario Waterfowl Survey used helicopters to survey breeding waterfowl from 1980-2008 on square 4 km² plots located within Northern Ontario. The goals of the survey were to collect quantitative information on breeding waterfowl in this region given its contribution to continental waterfowl populations and to obtain a better understanding of waterfowl distribution in Northern Ontario. Similar pilot surveys were carried out in Ontario, the Maritimes, and on the island of Newfoundland, using different survey protocols in terms of plot size, selection, and survey frequency, providing an opportunity to compare result quality and cost. For further details and comparisons among these pilot surveys, see Ross et al. (2017). Complete bilingual metadata including detailed survey design, protocols and data dictionaries is available in downloadable files.Ross, R.K., Bateman, M.C. and Bordage, D. 2017. Experimental Helicopter-based Waterfowl Breeding Pair Surveys in Eastern Canada,1985–1989. Pages 83 – 94 in Bordage, D., Bateman, M.C., Ross, R.K. and Lepage, C. (editors). Helicopter-based waterfowl breeding pair survey in eastern Canada and related studies. Black Duck Joint Venture Special Publication. 236 pp.

The Canadian Wildlife Service (CWS) Atlantic Agricultural Waterfowl Survey (ATLAG4) used helicopters to survey breeding waterfowl on square 2x2 km (4 km²) plots in agricultural areas in the Maritime Provinces (New Brunswick (NB), Nova Scotia (NS) and Prince Edward Island (PE) from 2008-2013. The survey was delivered in partnership with Ducks Unlimited Canda (DUC) and as part of the Eastern Habitat Joint Venture (EHJV) program. The objective of the survey was to establish baseline information about breeding season abundances and distributions of waterfowl in agricultural areas in the Maritimes, which were previously under-represented in other waterfowl surveys in the region.Complete bilingual metadata including detailed survey design, survey protocols, and data dictionaries is available in downloadable files.

The Canadian Wildlife Service (CWS) Québec Boréale Waterfowl Survey used helicopters to annually survey breeding waterfowl over five years from 1985-1989 on 10x10 km (100 km²) plots located within the Chibougamau region of Québec, a boreal zone at the heart of the American Black Duck's breeding range. The goals of the QCBO100 were to assess the impact of new hunting restrictions for the American Black Duck and to act as a pilot survey to help establish a standardized helicopter-based breeding pair survey for the Black Duck Joint Venture (BDJV) across the American Black Duck’s range. Similar pilot surveys were carried out in Ontario, the Maritimes, and on the island of Newfoundland, using different survey protocols in terms of plot size, selection, and survey frequency, providing an opportunity to compare result quality and cost. For further details and comparisons among these pilot surveys, see Ross et al. (2017). Complete bilingual metadata including detailed survey design, protocols and data dictionaries is available in downloadable files.Ross, R.K., Bateman, M.C. and Bordage, D. 2017. Experimental Helicopter-based Waterfowl Breeding Pair Surveys in Eastern Canada,1985–1989. Pages 83 – 94 in Bordage, D., Bateman, M.C., Ross, R.K. and Lepage, C. (editors). Helicopter-based waterfowl breeding pair survey in eastern Canada and related studies. Black Duck Joint Venture Special Publication. 236 pp.

The Canadian Wildlife Service (CWS) Québec Nunavik Great Whale (Grande Baleine) Waterfowl Survey used helicopters to survey breeding waterfowl on 25 10x10 km (100 km²) in 1991 during both the nesting and rearing periods on square plots located within the Great Whale River wetland complex, a heterogeneous network of inland lakes, ponds, and river-associated wetlands distributed across the Grande rivière de la Baleine watershed in Northern Québec and Nunavik. The survey targeted three main species (Canada Goose, Black Scoter and Surf Scoter) but recorded observations of 25 waterfowl species in total. The primary goal of the survey was to model the habitat associations of the three target species, combining observational data with habitat characterization using remote sensing, and subsequently to assess the reproductive potential of these three species over a larger area. Complete bilingual metadata including detailed survey design, protocols and data dictionaries is available in downloadable files.

The Canadian Wildlife Service (CWS), as commissioned by the Department of National Defense (DND), conducted the Labrador DND Waterfowl Survey using helicopters to survey breeding waterfowl in eight years between 1994-2004 on fourteen 10x10 km (100 km²) plots located in Labrador. The objective of the survey was to assess the effects of jet overflights in the DND low-level flight training area in Labrador on breeding waterfowl densities. The survey design included a subset of plots designated as control plots with no history of overflights and experimental plots that were subjected to high frequency, low (generally <500m above ground level) overflights (>4 per day). Earlier analyses based on the three control plots (DND-9, DND-10 WL-15) and three experimental plots (DND-1, DND-3, DND-8) surveyed from 1995-1998 showed high densities of Canada Goose and American Black Duck on the high frequency plots compared to the control plots, suggesting these species can use habitat that is subjected to frequent low-level jet overflights (Bateman et al. 1999). This is the first publication of the complete survey dataset including all plots, years and species.Complete bilingual metadata including detailed survey protocols and data dictionaries is available in downloadable files.Bateman, M.C., Hicks, A.H., & Bowes, S.M. 1999. Assessment of Breeding Waterfowl Populations in the Labrador Low Level Flight Training Area. Environmental Mitigation Program Supporting Military Flight Activity in Goose Bay, Labrador. Canadian Wildlife Service Report. https://publications.gc.ca/collections/collection_2023/eccc/cw66/CW66-1045-1999-eng.pdf

The Canadian Wildlife Service (CWS) Québec Lowlands Survey (Suivi des basses-terres) uses helicopters to annually survey breeding waterfowl on square 2x2 km (4 km²) plots located in three lowland areas in Southern Québec (St. Lawrence, Saguenay-Lac-Saint-Jean and Abitibi-Temiscamingue) within the breeding range of early nesters such as the American Black Duck, Mallard, Canada Goose and Wood Duck. The main goal of the survey is to generate reliable indices for trends of all waterfowl species with similar breeding phenology nesting within the Québec lowlands, i.e. annual indices should provide estimates of the population with a coefficient of variation (CV) of 10%, and population trend should detect a 10% decline over a period of 5 years with 90% confidence. A more specific goal is to monitor relative trends of American Black Duck and Mallard, given their competition for habitat in this region of Québec. Complete bilingual metadata including detailed survey design, protocols and data dictionaries is available in downloadable files.

The Great Lakes Migrant Waterfowl Surveys provide periodic data on waterfowl abundance, spatial and temporal distributions, and use along the shorelines of major water bodies and river systems in Ontario during mostly during spring and fall, and to a lesser extent during summer and winter, seasons. The primary survey area covers the shoreline and nearshore (~1km) waters of the Lower Great Lakes region of Ontario, specifically including the St. Lawrence River, Lake Ontario, Niagara River, Lake Erie, Detroit River and Lake St. Clair and associated major marshes and embayments. Aerial surveys, typically flown several times within spring (March –May: 1969, 1971, 1972, 1975 –1979, 1981, 1982, 1984 –1988, 1991 –1996, 1998 –2003 & 2009 –2011) and fall (September –December: 1968, 1970, 1971, 1974 –2003 & 2009 –2011) survey periods, have been conducted periodically on a relatively regular basis (approx. 5-10 years) along the Lower Great Lakes shorelines between 1968 and 2011. Smaller-scale surveys also have been conducted periodically during summer (June –August: 1968 –1970, 1972, 1974, 1975, 1977, 1982, 1984, 1986, 1989, 1999 & 2002) in this region. This survey often has been conducted in conjunction with the Midwinter Survey, so its data (up to 2004) also are included in the CWS Migrant Waterfowl Surveys database (Year ≥2004 & Month = January & February).Data from several aerial surveys conducted periodically during the non-breeding period outside the Lower Great Lakes region also are included in this database. Spring and fall surveys have been conducted along the shorelines and nearshore waters of the Upper Great Lakes region of Ontario, specifically at St. Clair River (Fall 2012 & 2013), Lake Huron (Fall 1973, 1996; Spring 1974) / Georgian Bay (Fall 1973, 1996, 2012 & 2013) & Lake Superior (Fall 2000). Aerial surveys also have been conducted inland in southeastern Ontario along the Rideau River (Fall 1998 & Spring 1999).

The Atlantic Colonial Waterbird Monitoring database captures geo-referenced data collected under the Atlantic Region’s Canadian Wildlife Service (CWS) Colonial Seabird Monitoring program, and data collected under CWS’ waterfowl and protected areas programs. These programs collectively monitor 22 species of colonial waterbirds breeding in the Atlantic Region of the following groups: fulmars, shearwaters, storm-petrels, gannets, gulls, terns, alcids, eiders, herons and cormorants, with the primary outcome to update information on the distribution, status, and trends of waterbirds breeding in all four Atlantic provinces. Surveys are conducted using one of three platforms: aerial, boat, or ground. Aerial surveys provide the most cost-effective way of conducting a comprehensive population census of diurnal species visible from air, namely gulls (Herring, Great Black-backed, Ring-billed, Glaucous), Black-legged Kittiwakes, Northern Gannets, terns (Arctic, Common, Roseate, Caspian), cormorants (Greater, Double-crested), Black Guillemots, and Common Eiders.Aerial surveys are also effective in identifying new colonies and provide additional information on how to most effectively conduct boat and ground surveys. Boat and ground surveys are conducted at smaller geographic scales and are necessary to obtain complementary information on the species composition of colonies and correction factors to finalize gull, tern and eider estimates obtained from the aerial surveys. Ground and/or boat surveys are also necessary to conduct colony counts of cliff-nesting birds (murres and fulmars), crevice nesting birds (razorbills and guillemots) and burrow-nesting birds (puffins, storm-petrels, shearwaters). Raw data are captured using various survey methods, including:1) visual estimates, 2) direct counts of number of individuals or apparently occupied sites and/or photo counts, 3) sub-sampling the colony through plot counts and extrapolating the estimated occupied densities over the occupied area which in turn is estimated using a variety of geographic information system approaches (e.g., Wilhelm et al. 2015). Important outcomes for how data are used include informing marine spatial planning, emergency preparedness, impact assessment of various anthropogenic threats, and COSEWIC status assessment (e.g., COSEWIC 2020). Further, these data are regularly used internally or in collaboration with partners to form the basis of peer-reviewed publications on regional, national, and/or global population trends for target species (e.g., Langlois Lopez et al. 2022, Iles et al. 2025).This dataset represents a subset of data collected from surveys led by CWS spanning from 1910 to 2024 and summarized to present, at a given colony, the year and count of birds from the most recent survey, the year and maximum count of birds within the last 20 years (if available), and the year and maximum count of birds ever recorded. In addition, CWS works closely with a variety of partners (e.g., provincial, other federal departments, academic, not-for profit organizations) to supplement colonial waterbird data collected in the Atlantic Region. To request additional census or survey data, please contact CWS.COSEWIC. 2020. COSEWIC assessment and status report on the Leach’s Storm-Petrel (Atlantic population) Oceanodroma leucorhoa in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. xii + 70 pp. (https://www.canada.ca/en/environment-climate-change/services/species-risk-public-registry.html). Iles, D.T., S.E. Gutowsky, A.M. Calvert, S.I. Wilhelm, J.-F. Rail, A. Hedd, H.L. Major, A.C. Smith, and G.J. Robertson. 2025. Estimating regional trajectories and trends of seabirds from sparse and inconsistent colony counts: case studies from eastern Canada with Leach’s Storm-Petrel and Atlantic Puffin. Avian Conservation and Ecology 20(2):16. https://doi.org/10.5751/ACE-02931-200216Langlois Lopez, S., Bond, A.L., O’Hanlon, N.J., Wilson, J.M., Vitz, A., Mostello, C.S., Hamilton, F., Rail, J.-F., Welch, L., Boettcher, R., Wilhelm, S.I., Anker-Nilssen, T., Daunt, F., and Masden, E. 2022. Global population and conservation status of the Great Black-backed Gull Larus marinus. Bird Conservation International, 1–11. https://doi.org/10.1017/S0959270922000181Wilhelm, S.I., Mailhiot, J., Arany, J., Chardine, J.W., Robertson, G.J., and Ryan, P.C. 2015. Update and trends of three important seabird populations in the western North Atlantic using a geographic information system approach. Marine Ornithology 43: 211-222.