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Ontario's Natural Heritage Areas - Ministry of Natural Resources

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Table 4-5. General congregatory thresholds for the establishment <strong>of</strong> Important Bird <strong>Areas</strong>.<br />

Image by P. Kor<br />

Category<br />

Congregations <strong>of</strong> Waterfowl: The site is regularly an<br />

important concentration site for waterfowl during any<br />

portion <strong>of</strong> the year. Concentrations refer to those present<br />

over a short period <strong>of</strong> time rather than over an entire<br />

season.<br />

Congregations <strong>of</strong> Seabirds: The site (terrestrial or marine)<br />

is regularly an important concentration site for seabirds<br />

during any portion <strong>of</strong> the year. Concentrations refer to<br />

those present over a short period <strong>of</strong> time rather than over<br />

an entire season.<br />

Congregations <strong>of</strong> Shorebirds: The site is regularly an<br />

important migratory stopover or wintering area for<br />

shorebirds. Concentrations refer to those present over a<br />

short period <strong>of</strong> time rather than over an entire season.<br />

Congregations <strong>of</strong> Raptors: The site is a regular migratory<br />

‘bottleneck’ for raptors. Concentrations refer to seasonal<br />

totals rather than those occurring over a brief period <strong>of</strong><br />

time.<br />

Congregations <strong>of</strong> Wading Birds: The site is an important<br />

concentration site for wading birds (herons, bitterns, and<br />

cranes) during any portion <strong>of</strong> the year. Concentration<br />

refers to those present over a short period <strong>of</strong> time rather<br />

than an entire season.<br />

Congregations <strong>of</strong> Migratory Land Birds: The site is a<br />

regular migratory stopover or corridor for migratory land<br />

birds (other than raptors). Sites nominated should contain<br />

exceptional numbers and or diversity <strong>of</strong> migratory land<br />

birds.<br />

Source: Chaundry-Smart and Wilcox (2001).<br />

Ontario’s <strong>Natural</strong> <strong>Heritage</strong> <strong>Areas</strong> 112<br />

Condition: Minimum Number <strong>of</strong> Birds Present<br />

Global<br />

20,000<br />

20,000<br />

20,000<br />

20,000<br />

10,000<br />

Large<br />

concentration<br />

Continental<br />

15,000<br />

15,000<br />

15,000<br />

15,000<br />

5,000<br />

——<br />

National<br />

10,000<br />

10,000<br />

10,000<br />

10,000<br />

500<br />

——

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