Meeting Summary
reviewed horseshoe crab surveys. Usually, the DBETC also reviews shorebird surveys; however, the committee was not able to do so this year due to extenuating circumstances. Below is a summary of their discussions. Calculation of Red Knot Threshold and ARM Harvest Output Since the implementation of A...
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| Format: | Text |
| Language: | English |
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2013
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.393.8983 http://www.asmfc.org/uploads/file/DBETCMeetingSummary_Sept2013.pdf |
| Summary: | reviewed horseshoe crab surveys. Usually, the DBETC also reviews shorebird surveys; however, the committee was not able to do so this year due to extenuating circumstances. Below is a summary of their discussions. Calculation of Red Knot Threshold and ARM Harvest Output Since the implementation of Addendum VII in 2012, the red knot threshold which is used in the ARM model has been 45,000 birds. This threshold was based upon aerial peak counts and ground counts when aerial counts were not able to meet objectives (such as bad weather) preventing them. However, it was recognized that peak counts do not capture the full population because they cannot take turnover into account. In 2011, new monitoring of the marked to unmarked ratio was implemented to address this issue. For 2014, the ARM Working Group (ARM WG) felt that there was enough data to begin using this mark-resight estimate. The ARM WG presented their recommendation for moving from ground and aerial counts to markunmarked ratio estimates of red knots, which involves adjusting the threshold to account for differences in the different methodologies. The DBETC discussed the best way to adjust the red knot threshold proportionately and decided to accept the recommendations of the WG, based |
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