The 1992 and 1993 summary of the North American breeding bird survey
Using data from the North American Breeding Bird Survey (BBS), continental and regional
changes in bird populations were estimated for the 2-year periods of 1991-1992 and 1992 …
changes in bird populations were estimated for the 2-year periods of 1991-1992 and 1992 …
Second atlas of breeding birds in Pennsylvania
AM Wilson, DW Brauning, RS Mulvihill - 2012 - cupola.gettysburg.edu
This is a culmination of a 10 year collaborative effort involving many state agencies,
academic institutions and NGOs. This 612 page atlas, based on the fieldwork of 2000 …
academic institutions and NGOs. This 612 page atlas, based on the fieldwork of 2000 …
The North American breeding bird survey 1966–2011: summary analysis and species accounts
Abstract The North American Breeding Bird Survey is a roadside, count-based survey
conducted by volunteer observers. Begun in 1966, it now is a primary source of information …
conducted by volunteer observers. Begun in 1966, it now is a primary source of information …
[PDF][PDF] Ontario region
CE GOODWIN - American Birds, 1978 - sora.unm.edu
The mild beginnings to the winter produced a host of record late departures for later
migrants. Late departures have been features of recent winters, and they continued …
migrants. Late departures have been features of recent winters, and they continued …
The role of the North American Breeding Bird survey in conservation
MAR Hudson, CM Francis, KJ Campbell… - The Condor …, 2017 - academic.oup.com
Abstract The North American Breeding Bird Survey (BBS) was established in 1966 in
response to a lack of quantitative data on changes in the populations of many bird species at …
response to a lack of quantitative data on changes in the populations of many bird species at …
The Breeding Bird Survey: its first fifteen years, 1965-1979
CS Robbins, D Bystrak, PH Geissler - 1986 - pubs.usgs.gov
Abstract The Breeding Bird Survey (BBS) is an ongoing cooperative program sponsored
jointly by the US Fish and Wildife Service and the Canadian Wildlife Service. Its main …
jointly by the US Fish and Wildife Service and the Canadian Wildlife Service. Its main …
[PDF][PDF] Population status of North American grassland birds from the North American breeding bird survey
BG Peterjohn, JR Sauer - Studies in avian biology, 1999 - researchgate.net
We summarize population trends for grassland birds from 1966 to 1996 using data from the
North American Breeding Bird Survey. Collectively, grassland birds showed the smallest …
North American Breeding Bird Survey. Collectively, grassland birds showed the smallest …
[图书][B] The Arizona breeding bird atlas
TE Corman, C Wise-Gervais - 2005 - books.google.com
The Arizona Breeding Bird Atlas is the capstone of the first comprehensive statewide survey
of Arizona's breeding birds. More than 700 surveyors, mainly volunteers, reported a total of …
of Arizona's breeding birds. More than 700 surveyors, mainly volunteers, reported a total of …