Tennessee BBS 6: Gnatcatchers to Waxwings
35 year change: +8.13 (+267%) ± 1.12
Still another common species that has shown a large increase in numbers on Tennessee BBS routes. Gnatcatcher counts have increased steadily by roughly a factor of four.
35 year change: +9.73 (+146%) ± 1.54
Though the first decade or so of the BBS appeared to show a decline in Bluebirds in Tennessee, in 1979 this turned and the overall trend for the BBS era has been strongly upwards.
35 year change: +0.01 ± 0.01
Recorded only on the Fish Springs route and only in a few years, the Veery data provide little information.
35 year change: -2.25 (-24%) ± 1.02
Wood Thrushes have declined modestly since the inception of the BBS, with most of this drop taking place between 1975 and 1990. Numbers have been quite stable in recent decades.
35 year change: +13.21 (+113%) ± 4.36
Robin numbers increased steadily until about 1990 and have remained approximately stable since then. This is now one of the most widespread and abundant species on Tennessee BBS routes.
35 year change: -3.04 (-71%) ± 0.42
Catbirds have declined throughout the BBS period, with an especially steep drop during the 1980s. Present day counts are barely a quarter of what they were in the 1960s.
35 year change: -4.32 (-16%) ± 1.59
There has been a small but statistically significant drop in Mockingbird numbers, most of which took place before 1980. Mockingbirds remain abundant and widespread with stable counts in recent decades.
35 year change: -1.15 (-21%) ± 0.68
Thrashers have also shown a small but statistically significant decline through the period.
35 year change: +8.14 (+15%) ± 9.78
Though Starling numbers appear to have fluctuated somewhat, the change across the entire BBS era is not statistically significant. They were abundant in the 1960s, and remained just as abundant in the 2000s.
35 year change: +2.28 (+871%) ± 1.12
Waxwing numbers underwent a rapid shift during the late 1980s and early 1990s from a low, stable level to a much higher and more variable plateau.
Tennessee BBS index:
1: Waterfowl to Herons
2: Vultures to Doves
3: Cuckoos to Woodpeckers
4: Flycatchers to Corvids
5: Larks to Wrens
6: Gnatcatchers to Waxwings
Next: 7: Wood Warblers
8: Towhees to Buntings
9: Icterids to House Sparrow
Ups and Downs