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To broadcast or not to broadcast?

To broadcast or not to broadcast?. How structure call-broadcast?. all surveys broadcast same suite of species 6 pre-defined suites of species all surveys broadcast 5 species all surveys include 5 min of broadcast 1-13 spp in broadcast, survey duration varies.

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To broadcast or not to broadcast?

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  1. To broadcast or not to broadcast?

  2. How structure call-broadcast? • all surveys broadcast same suite of species • 6 pre-defined suites of species • all surveys broadcast 5 species • all surveys include 5 min of broadcast • 1-13 spp in broadcast, survey duration varies

  3. Maximize analytical capabilities of pooled data 11-min survey in LA 9-min survey in MO

  4. Merge data to the extent possible

  5. Compare first 9 min of each survey

  6. Compare 8 min of similar survey effort

  7. Compare 5 min passive survey only

  8. Detection probability may change with marsh succession

  9. Detection probability may change following wetland mgmt actions

  10. Detection probability likely varies spatially population density plant communities nesting stage

  11. Capture-recapture models to estimate vocalization probability

  12. Call types help reduce observer bias 2001 observer #1 2006 observer #2

  13. Call types can help explain temporal or spatial differences in # counted

  14. Recording repeats reduces observer bias observer #1 observer #2

  15. Was bird detected at previous point? - local (50m) vs regional (400m) needs

  16. Multiple-observer surveys allow estimation of observer bias - call type - distance - one line per bird

  17. Spp recorded at all sites • Spp recorded at all sites but calls not broadcast • Spp recorded at all sites but not 1 indiv per line • Spp that some sites record, some do not

  18. 190 sites in 51 states/provinces 104 different broadcast sequences ~150,000 detections 3-day training workshops

  19. Additional passive period at end • 3 counts per point per year • - variation in spp breeding dates • - high daily variation in detection • many end up with 1-2 counts • still know very little about rare spp

  20. Where to place survey points? • - water edge • - upland edge • - interior

  21. Surveying interior marshes would be disruptive in some regions

  22. Record location of survey point • - water edge • - upland edge • - interior

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