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- W2188290162 abstract "Analyses of trends in the populations of nearctic-neotropical migrant birds using 1930s-1960s data have indicated declines in many cases. More recent reports, however, suggest that populations of most forest-dwelling migrants are stable or increasing. Our analyses of Breeding Bird Census data, 1940-1995, for 46 sites in the eastern and central United States indicate that 6 of 10 mature forest-dwelling nearctic-neotropical migrants exhibited significant declines over this period, and none increased. However, when only the recent (>1966) portion of data-sets were used, no significant declines were evident and one species increased. Standard errors did not differ between the two sample periods, so lack of significant trends during the latter period was not the result of increased variability in trend estimates due to reduced sample size. Rather, trend analyses appear to be affected by survey period, and our results indicate that population declines in the eastern and central United States are not evident in recent data (>1960s) because the bulk of declines had already occurred. Our conclusion emphasizes that an awareness of the limitations imposed by temporal scale is critical to the valid interpretation of avian population trends." @default.
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- W2188290162 date "2006-01-01" @default.
- W2188290162 modified "2023-09-27" @default.
- W2188290162 title "LONG-TERM POPULATION TRENDS OF FOREST- DWELLING NEARCTIC-NEOTROPICAL MIGRANT BIRDS: A QUESTION OF TEMPORAL SCALE 1" @default.
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