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Conventional tags (plastic)

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Brazil 1960’s Nordic fisheries1970’s Gulf of Maine 2003 (from giant to juvenile schools)

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Anchor Electronics with light, temperature & pressure sensors at the outer body Float to the surface Send data to satellites No recovery needed

  • Positions are calculated from light
  • Longitudes are fairly accurate
  • Latitudes can be erroneous

Corrosive link dissolves Separate tag from the shark

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Statistical state-space Kalman filter models for positioning

Validation of models with double-tagging experiments Widely used by the community (free, open source)

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SLIDE 15

Positioning models

Manufacturer Software Ukfsst Kfsst Kftrack Trackit

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Google code: geolocation

http://code.google.com/p/geolocation/

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Aspects of electronic tag data processing workflow

Lam CH, Tsontos VM (2011) Integrated Management and Visualization of Electronic Tag Data with Tagbase. PLoS ONE 6(7):

  • e21810. doi:10.1371/journal.pone.0021810

http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021810

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SLIDE 20

Another free online mgmt system for movement data With tools for analysis, public outreach and archiving data at www.movebank.org Example: Orinoco Geese converging on Bení, Bolivia in wet season (come see poster tonight!).

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Galuardi, B, Royer, F. Golet, W., Logan, J.M., Neilson, J., and M. Lutcavage. 2010. Complex migration routes of Atlantic bluefin tuna question current population structure paradigm. Can. J. Fish.

  • Aquat. Sci. 67:966-976.
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July n = 9 September n = 22 August n = 9 27 juveniles (Age 2-5) ~ 6000 data days

Galuardi, B., and M.E.

  • Lutcavage. 2012.

Dispersal routes and habitat utilization of juvenile Atlantic bluefin tuna, Thunnus thynuus, tracked with mini PSAT and archival tags. Plos ONE 7(5) e37829. doi: 10.1371/journal.pone. 0037829.

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January n = 20 March n = 20 February n = 20

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