Arizona New Mexico Flagstaff Albuquerque Phoenix Tucson.

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Presentation transcript:

Arizona New Mexico Flagstaff Albuquerque Phoenix Tucson

Arizona New Mexico

Methods 3-min passive survey 3-min call-broadcast survey 2021 points 115 survey routes 200m spacing 0600-1100 h

Coverage and Analyses replicated 1980-83 and 1995-96 surveys 9 mountain ranges replicated 1980-83 and 1995-96 surveys detected 56 flycatchers regress year vs # BBFLs for each route meta-analysis to test Ho: trend  0

Estimating detection probability p = (pvocal).(pobs) focal bird trials (n=93) focal nest trials (n=8) double sampling (n=15 canyons)

Effects of fire on BBFL distribution 1. burned vs non-burned paired surveys <10 year-old fires only areas with no records of BBFLs 2. BBFL presence correlated with fire

Fire Index 0 - no evidence of fire 1 - low-intensity ground fire 2 - medium-intensity ground fire 3 - high-intensity ground fire 4 - high-intensity crown fire 5 - old, high-intensity crown fire

BBFLs have declined in 13 of 19 canyons in SE Arizona since 1995 df = 18 P = 0.04

Detection Probability focal bird trials (pvocal) 92% focal nest trials 75% at 100m 100% at 50m double sampling 78%

Call broadcast increased detection probability of BBFLs by 49% more calls, more visuals more songs

But, call broadcast decreased detection probability of 97% of the co-existing birds by an average of -25%

Surveys may need to be longer than 6 min.

BBFLs detected across wide range of elevations

Effects of fire

0 BBFL detected 0 BBFL detected

BBFLs associated with burned woodlands

Buff-breasted flycatchers more common in burned woodlands P = 0.007

If BBFLs like burned woodlands and fire suppression = population declines, why no BBFLs in burned canyons? lack of local recruitment? lack of emigrants from Mexico?

Arizona New Mexico