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SUMMARY:Different uses for spatial overlap scores: testing gannet sexual s
 egregation &amp\; predicting kittiwake foraging areas - Beth Clark\, Unive
 rsity of Exeter/RSPB
DTSTART:20170419T100000Z
DTEND:20170419T110000Z
UID:TALK71984@talks.cam.ac.uk
CONTACT:Claire Waluda
DESCRIPTION:To quantify spatial overlap\, I use Bhattacharyya’s affinity
  to measure the difference between kernel density estimates. My first use 
 of this method is for testing the differences between the space use of mal
 e and female gannets. To assess whether segregation is significantly diffe
 rent\, I used a randomisation approach. Our results show that sexual segre
 gation patterns differ between colonies and time periods. My second use of
  spatial overlap testing is for assessing the performance of a new method.
  Using a 6-year kittiwake GPS-tracking dataset from 13 UK colonies\, I tes
 ted whether we can predict where birds forage from only information that c
 ould be collected at the colony or from the literature on past tracking st
 udies. I developed a method using distances predicted by trip durations\, 
 along with departure bearings\, to simulate locations. I could then calcul
 ate a kernel density estimate from predicted points and use Bhattacharyya
 ’s affinity to measure how well they match up with kernel density estima
 tes calculated using the real GPS data.
LOCATION:British Antarctic Survey\, Room 330B
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