Species Coverage at
Bon Portage Island, ABO

Index

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Explanation 
of  DET s

 

This table presents a summary of the mean number of birds recorded by daily estimated totals (DET) and mean number of birds banded in each season at Bon Portage Island (Atlantic Bird Observatory) from 1997-1999. Cells that contain a dash indicate that the species did not meet the minimum criteria in that season. This table only includes species for which an average of at least 10 individuals were recorded per season per year, on an average of at least 5 days.   Species are sorted by priority of greatest need for migration monitoring, with ‘A’ the highest priority.

Migration
Trends

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Priority Codes

The highest priority species for migration monitoring are those species that breed mainly in areas where they are not adequately covered by breeding ground surveys such as the Breeding Bird Survey. A secondary consideration is whether the species winter mainly south of the United States, and hence cannot be surveyed by winter surveys such as the Christmas Bird Count. On this basis, species in categories A-D are all important for migration monitoring, with species in category A the highest priority. The categories are defined as follows:

A. Species with <50% of North American (Canada & U.S. only) breeding range covered by BBS, and <60% of their winter range in U.S. and Canada.

B. Species with <50% of North American breeding range covered by BBS, but >60% of their winter range in U.S. and Canada.

C. Species with <60% of their Canadian & Alaskan breeding range (but >50% of North American range) covered by BBS, and <60% of their winter range in U.S. and Canada.

D. Species with <60% of their Canadian & Alaskan breeding range (but >50% of North American range) covered by BBS, but >60% of their winter range in U.S. and Canada.

E. Species with >60% of both their Canadian and North American breeding range covered by BBS, and <60% of their winter range in U.S. and Canada.

F. Species with >60% of both their Canadian and North American breeding range covered by BBS, and >60% of their winter range in U.S. and Canada.

X. Resident landbirds that are considered to be unsuitable candidates for migration monitoring.

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