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Odobenus Rosmarus

Odobenus Rosmarus. Walrus: Large marine mammal Tusks Pinniped. Ecology & Distribution. Arctic Regions Two main populations: Atlantic walrus Pacific walrus Migration. Mark-Recapture. Most common method used in ecology. Set up traps. Take samples of walrus population.

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Odobenus Rosmarus

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  1. OdobenusRosmarus Walrus: Large marine mammal Tusks Pinniped

  2. Ecology & Distribution • Arctic Regions • Two main populations: • Atlantic walrus • Pacific walrus • Migration

  3. Mark-Recapture • Most common method used in ecology. • Set up traps. • Take samples of walrus population. • Analyze data and calculate mathematically.

  4. LIDARLIghtDetection And Ranging • Advantages of the LIDAR method. • Sends out harmless beams. • Easier and faster to determine the population size.

  5. Conclusion There is no perfect method!

  6. References • Born, E. W., Gjertz, I. and Reeves, R. R. (1995). Population assessment of the Atlantic walrus (OdobenusrosmarusrosmarusL.). NorskPolarinstituttMeddelelser nr. 138. pp 100. • Microsoft Encarta 2009. 1993-2008 Microsoft Corporation. • David G. B., Pierre R. R., Klaus P. H. and Jack O. 1990. Walrus Population Assesment. Calibration of Aerial Thermal Infrared Imagery for Walrus Population Assessment. Arctic 44:56-65.

  7. Odobenus Rosmarus

  8. Age determination methods of theOdobenus Rosmarus • Three basic methods. • Method 1: Hard structured layers! • Dental material • Removing and counting • If canine teeth damaged? alternative teeth can be used. • Jaws of killed walruses are collected or capture-release technique used.

  9. Method 2: Body characteristics • Life span +/-16-40 • Mass adult(1700kg) newborns(38kg) • Figure feature changes • Hair colour (cinnamon) • Hair thinning

  10. Method 3:behaviour • Observations • Atlantic and Pacific • Migration patterns

  11. Cont. method 3: behaviour • Method possible by constant movement monitoring

  12. References • Mammalian Species. No 238 pp.1-7. Odobenus Rosmarus by Francis H.Fay. Pub 25 May 1985 by the American Society of Mammologists • Comparison of tooth age estimate of Atlantic Walruses (Odobenus Rosmarus) Marine Mammal Science. Vol 21, issue 2, pp346-354 • www3.interscience.Wiley.com/journal

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