Re-use of shallow sediment patches by Pacific sand lance (<Emphasis Type="Italic">Ammodytes hexapterus</Emphasis>) in Barkley Sound,British Columbia,Canada |
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Authors: | Trevor B Haynes Clifford L K Robinson |
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Institution: | (1) Marine Protected Areas Research Group, Geography Department, University of Victoria, Victoria, BC, Canada;(2) Parks Canada Agency, Western and Northern Service Centre, Vancouver, BC, Canada, V6B 6B4;(3) Present address: School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK 99775–7220, USA |
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Abstract: | We determined whether, during the summers of 2002–2004, young-of-the-year (YOY) Pacific sand lance (Ammodytes hexapterus) re-used patches of sediment in intertidal and shallow subtidal regions of Barkley Sound, British Columbia, Canada. We examined
re-use weekly at a single sediment patch in 2003 and 2004 via mark-recapture methods, monthly by re-sampling 15 patches in
2002 and interannually by re-sampling 36 patches in all 3 years (2002–2004). The mark-recapture results showed that, within
each summer, batch marked YOY sand lance re-used the same patch up to 8 weeks later. The re-sampling of 15 patches over 4 months
in 2002 showed that YOY sand lance consistently occupied patches within a season. We found the greatest variability in sediment
patch re-use at the interannual time scale with major fluctuations in occurrence and abundance during 2002–2004. The interannual
variability in patch re-use is most likely linked to abundance rather than the local or regional environmental characteristics
that we examined. |
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