FGSP_CL EvansThe dry prairies of central Florida are one of the most threatened ecosystems in the United States with much of the historic extent having been converted to orange groves and cattle pastures over the past century. This has resulted in a fragmented landscape with few remaining large patches of highly-suitable dry prairie habitat remaining. With a distribution restricted entirely to these rapidly diminishing prairies, the Florida grasshopper sparrow (Ammodrammos savannarum floridanus) is one of the most critically-endangered birds in North America. This subspecies is currently protected by the Endangered Species Act, but populations in the wild are so small the threat of extinction is real. At present there may be fewer than 150 individuals remaining in the wild. Conservation efforts center around acquiring, protecting and restoring critical habitat and finding ways to reestablish populations in areas formerly occupied by the sparrow.

Playback Setup_NowIn 2015, Ecostudies Institute began studying the Florida grasshopper sparrow contributing towards the ongoing conservation efforts to keep this subspecies from extinction. Our efforts included an attempt to reestablish populations at Kissimmee Prairie Preserve State Park through the use of artificial song playback to attract sparrows to formerly occupied breeding habitat. As part of our experiment, we also tested the use of remote recorders as a monitoring method to detect singing male sparrows. While our song playback study was not successful as of yet, we did successfully use the recorders to detect sparrows. Next year, we will follow-up with additional surveys to see if any sparrows settle in our study sites, perhaps in response to our song playback from the year before.

Find out more about the Florida grasshopper sparrow here.

Key Findings

Below we report some key findings from our first field season monitoring Florida grasshopper sparrows in Kissimmee Prairie Preserve State Park. In 2015, we established two study plots in areas with suitable prairie habitat formerly occupied by Florida grasshopper sparrows. We deployed two playback units to broadcast conspecific song in an attempt to attract sparrows to these unoccupied prairie units to breed.

  • We successfully used remote field recording devices (SM2+ Song Meters by Wildlife Acoustics, Inc.) to record singing male grasshopper sparrows at one of our study sites in 2015. The sparrows were only detected singing early in the breeding season, however, and thus were likely males from the migratory subspecies of grasshopper sparrow (A. s. pratensis) present at Kissimmee Prairie during the winter.
  • Additional ground surveys were conducted by collaborators at Kissimmee Prairie Preserve State Park and the U.S. Fish & Wildlife Service during the 2015 breeding season. Unfortunately, the ground surveys did not detect any Florida grasshopper sparrows on our study plots this year.
  • Although the conspecific attraction experiment did not appear to be successful as of yet, we were encouraged by our ability to successfully use remote recording devices as a monitoring method that could save resources in the future. Further, we developed a song recognizer that can be used to scan hours of field recordings very efficiently which also significantly saves data analysis time.

Education

Reports and Publications

  • Virzi, T. 2015. Florida grasshopper sparrow (Ammodrammos savannarum floridanus) conspecific attraction experiment. Report to the U.S. Fish & Wildlife Service (South Florida Ecological Services, Vero Beach, FL) and the Fish & Wildlife Foundation of Florida (Tallahassee, FL). {PDF}

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