Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Eastern Screech Owl

3,167 views

Published on

Eastern Screech Owl Project Presentation for Life on the Planet Earth Class. Part of NYC Ecology Wiki

Published in: Education, Technology, Sports
  • Be the first to comment

  • Be the first to like this

Eastern Screech Owl

  1. 1. Eastern Screech-Owl (Megascops asio) By Liz Yaslik NYC Ecology Wiki
  2. 2. About the Owl  Small in size among other “eared” owls  Nocturnal raptor  Usually red or gray in color  Found in suburban and rural areas  Non- migratory (stays relatively close to home area)
  3. 3. Flickr Photo by Bobtravis
  4. 4. Habitat  Found in suburban and rural areas  Cavity nester but do not create the cavities themselves  Lives in many parks in New York City  Willing to use nest boxes placed in parks
  5. 5. Screech Owl in Nest Box Flickr Photo by Gilintx
  6. 6. Central Park Reintroduction  Native to Central Park for decades  Decrease in population from 1930s-1950s  New York City Urban Park Rangers worked to reintroduce the owl into the park  1998- NYCUPR released 6 owls into Central Park -the owls were not equipped with monitoring devices  2001 & 2002- NYCUPR released 32 owls into Central Park - 30 of the owls were equipped with radio transmitters
  7. 7. Central Park New York City Flickr Photo by Jimbowen0306
  8. 8. Central Park Reintroduction  Released owls were found to have 23% survival rate  Suggests that about 77% of owls died or left the area  Owl deaths due to lack of food, predation, impact with objects, or rodenticide poison  2003- None of the 7 owls released in 1998 were found  7 owls from the 2001-2 release remained in the park
  9. 9. Flickr Photo by Dobak
  10. 10. Tracking the Owls  Owls were banded and equipped with radio transmitter backpacks One month after 2001 release, 12 of 17 birds  equipped with radio backpacks had been separated from backpacks By 2003 all transmitter batteries had died  Central Park bird watchers contacted researchers  about sightings Call surveys using owl calls  Collecting owl pellets to locate 
  11. 11. Eastern Screech Owl Sightings Since 2001 Map Created By Liz Yaslik using Google Earth
  12. 12. Problems with Reintroduction  Most of the owls had slipped out of transmitter packs  Batteries of packs died  A decrease in bird watchers could lead to a decrease in bird sightings, not necessarily a decrease in owls
  13. 13. Possible Causes of Owl Decrease  Lack of males or females, slowing reproduction rates  Poor weather conditions  Increase in owl predators  Collision of owls with other structures  Habitat or cavity destruction/competitors  Fewer bird watchers
  14. 14. Red Phase Eastern Screech Owl Flickr Photo by rbs10025
  15. 15. Importance of Reintroduction  Maintain biodiversity in New York City  Necessary for park ecosystem  Create breeding pairs
  16. 16. Click to play virtual tour
  17. 17. Personal Observations  Relatively difficult to track the owls  Radio transmitters are not reliable  Most owls left Central Park area, the owls may know which areas are best
  18. 18. Recommendations  Since 77% of reintroduction population left the area, discontinue reintroduction Research why owls choose other areas  Keep track of number of males and females  Check availability of owl habitats, add more nest  boxes if necessary Track the owls’ available food sources and  reproduction rates
  19. 19. Bibliography Bibliography  Andrle, Robert F. 1987. The Atlas of Breeding Birds in New York State. Ed. Janet R. Carroll.  Ithaca: Cornell University Press.  Audubon New York. Audubon Sharon: Resident Animals, Our Resident Screech Owls.  http://www.audubon.org/local/sanctuary/sharon/plant_animal/EasternScreechOwl.html.  Belthoff, James R. 1993. Home Ranges of Adult and Juvenile Eastern Screech-Owls: Size,  Seasonal Variation and Extent of Overlap. J. Raptor Res. 27: 8-15.  DeCandido, Robert. 2002. quot;The Screech-Owls of Central Park.quot; Birder's World 16, no. 6: 58.   Academic Search Complete, EBSCOhost (accessed March 1, 2009).   DeCandido, Robert. 2005. History of the Eastern Screech-Owl (Megascops asio) in New York  City 1867-2005. Urban Habitats 3.1 (2005): 1-17.  Gehlbach, F.R. 1995. Eastern screech-owl (Otus asio). In Poole, A. & F. Gill, (Eds.) The birds of  North America (No. 165). Philadelphia: Academy of Natural Sciences; Washington, DC:  American Ornithologists' Union.  Nagy, Christopher. “The Eastern Screech Owl Reintroduction Program in Central Park, New  York City: Habitat, Survival, and Reproduction” (M.S. Biology Thesis, Fordham  University, 2004), 1-46.  New York City Department of Parks and Recreation. The Daily Plant: Screech Owls Return to  Central Park. http://www.nycgovparks.org/parks/prospectpark/dailyplant/11498.  Robbins, Chandler S., Bertel Bruun, and Herbert S. Zim. 1966. A Guide to Field Indentification:  Birds of North America. New York: Golden Press.  Sibley, David A. 2001. National Audubon Society: The Sibley Guide to Bird Life and Behavior.  Eds. Elphick, Chris, John B. Dunning Jr. New York: Alfred A. Knopf, Inc. 

×