Vermont Breeding Bird Atlas
First and Second Priority Blocks
Priority Block Count: "First" = Priority 1 blocks. These were surveyed during both the first and second atlases, and only these data are used to compare results from the two atlases, e.g., in the "Change in Distribution" map. "First & Second" = Priority 1 and 2 blocks combined. Priority 2 blocks were randomly selected blocks that received full coverage during the second Atlas, in addition to Priority 1 blocks.
Explanation of Conservation Rankings
1 - Very rare (Critically imperiled): At very high risk of extinction or extirpation due to extreme rarity (often 5 or fewer populations or occurrences), very steep declines, or other factors
The following may follow a numeric rank to provide further information:
? - indicates uncertainty about the rank, uncertainty may also be expressed in the form of a range rank (e.g. S1S3)
State Status - Legal protection under Vermont Endangered Species Law (10 V.S.A. Chap. 123)
SGCN - Species of Greatest Conservation Need as identified in the Vermont Wildlife Action Plan; does not denote legal protection.
List of commonly used abbreviations:
AOU - American Ornithologists' Union
What is a State Recovery Plan?
This State Recovery Plan identifies effective actions that will contribute to the conservation and recovery of the state-threatened species. It outlines population assessment and monitoring needs for tracking changes in distribution and abundance of the population as well as for determining success or failure of the recovery effort.
What is a "high or low mast" year?
IThe term “mast” refers to the fruit of certain forest trees that produce seeds of sufficient bulk and nutritional value that they can serve as a food for larger animals. Production of mast varies from year to year; high mast being when large numbers of seeds are produced, and low mast when fewer seeds are produced.
What is "early/mid successional"?
The progressive replacement of one dominant type of species or community by another in an ecosystem until a stable climax community is established.
What is "riparian"?
Relating to, living, or located on the bank of a natural watercourse (as a river) or sometimes of a lake or a tidewater.
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© VCE 2013