A Four-year Summary of Breeding Bird Surveys in TFL 48 ... - BIOD

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Variation in abundance among transects within a species is most likely attributedto differences in habitat quality and availability, whereas variation among years isprobably attributable to other factors (e.g., climatic variation, annual fecundity). Forexample, among the first six transects that were established in 2002, the abundance ofSwainson's Thrush was usually greatest on the West Utah-Johnson Creek transect, buthighly variable among the four years surveyed (Figure 8). From 2002 – 2004, theabundance of Tennessee Warbler and Wilson's Warbler was relatively consistentamong the same six transects. The abundance of Chipping Sparrow, Ruby-crownedKinglet, and Yellow-rumped Warbler were variable among both transects and years,with synchrony in relative abundance occurring in some years, and asynchrony inabundance occurring in other years. Both Gwillim (in 2005) and Wolverine contributemore to the variability than other transects because of lower sample sizes.14
1059075Swainson's ThrushHasler FSRMurray RiverSukunkaW Utah-Johnson CkWestcoast-HighhatWillow-Falling CkAbundance6045301502002 2003 2004 2005Year1059075Tennessee WarblerHasler FSRMurray RiverSukunkaW Utah-Johnson CkWestcoast-HighhatWillow-Falling CkAbundance6045301502002 2003 2004 2005Year1059075Wilson's WarblerHasler FSRMurray RiverSukunkaW Utah-Johnson CkWestcoast-HighhatWillow-Falling CkAbundance6045301502002 2003 2004 2005YearFigure 8. Annual variation in abundance within and among transects for Swainson'sThrush, Tennessee Warbler, and Wilson's Warbler in TFL 48.15
Page 2: Table of ContentsEXECUTIVE SUMMARY.
Page 5 and 6: INTRODUCTIONWe began establishing B
Page 7 and 8: associations, as well as BEC subzon
Page 9 and 10: 2005, a handheld Magellan GPS with
Page 11 and 12: 30002500Total Observations200015001
Page 13 and 14: 525048Species Richness4644424038200
Page 15 and 16: For TFL 48, mean rank abundance per
Page 17: 1.000.80# Birds / Station0.600.400.
Page 21 and 22: Preliminary TrendsAnnual variation
Page 23 and 24: Alder FlycatcherAmerican Redstart30
Page 25 and 26: Species Listings: Committee on the
Page 27 and 28: DISCUSSION and RECOMMENDATIONSCover
Page 29 and 30: scale. Because of the way in which
Page 31 and 32: subzone preference by species, and
Page 33 and 34: Preston, M.I., and P. Vernier. 2003
Page 35 and 36: APPENDICESAppendix 1. List of speci
Page 37 and 38: Code Species Scientific Name TFL 48

A Four-year Summary of Breeding Bird Surveys in TFL 48 ... - BIOD

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