1 / 12

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.

charles-houston
Download Presentation

Odobenus Rosmarus

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related