Ontario's Natural Heritage Areas - Ministry of Natural Resources
Ontario's Natural Heritage Areas - Ministry of Natural Resources
Ontario's Natural Heritage Areas - Ministry of Natural Resources
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
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 />
——