The role of memory in shaping migratory behavior
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1 The role of memory in shaping migratory behavior Jerod A. Merkle, Hall Sawyer, and Matt Kauffman Wyoming Cooperative Fish and Wildlife Research Unit, University of Wyoming Western Ecosystems Technology, Inc. U.S. Geological Survey S. Dwinnell
2 Why animals migrate Attraction to fitness enhancing locations Increase energy intake Mate finding Avoiding areas with unfavorable conditions Energy expenditure (hot, cold, buggy places) Competition Predation Avgar et al (Review in CJZ)
3 Migration can be spectacular Arctic tern A Trepte Egevang et al (PNAS)
4 How do they migrate? 1. Tracking resource and environmental gradients 2. Employing memory capabilities
5 Forage Maturation and Green-Wave Hypotheses Intake Digestibility Forage biomass (Fryxell 1991 Am Nat; Hebblewhite et al. 2008, Ecol Monogr)
6 Spatial and attribute memory Jays and Caching Can remember location, content, and time of caching I Taylar Clayton et al (Phil Trans Royal Soc)
7 Predictions/Expectations Variable Tracking Memory
8 Predictions/Expectations Variable Tracking Memory Green-wave surfing Yes Perhaps
9 Predictions/Expectations Variable Tracking Memory Green-wave surfing Yes Perhaps Movement bias towards previous year s summer range No Yes
10 Predictions/Expectations Variable Tracking Memory Green-wave surfing Yes Perhaps Movement bias towards previous year s summer range Movement bias towards previous year s route No No Yes Yes
11 Predictions/Expectations Variable Tracking Memory Green-wave surfing Yes Perhaps Movement bias towards previous year s summer range Movement bias towards previous year s route No No Yes Yes Migratory route changes over time Yes No
12 Mule deer - Red Desert to Hoback migration S. Dwinnell n = 13 animal-years Up to approx. 240 km migration
13 Step Selection Function during migration Base model: Elevation, slope, aspect, % cover, distance to road, terrain position index, integrated NDVI Tracking hypothesis Instantaneous rate of green-up (IRG) Memory hypothesis: Bias towards previous summer range Bias towards previous migration route Used Un-used (Hird and McDermid 2009, Beck et al. 2006, Fortin et al. 2005)
14 Normalized Difference Vegetation Index (NDVI) Spatial and temporal measure of greeness Forage biomass NDVI (Pettorelli et al. 2005, TREE; Bischof et al. 2012, Am Nat)
15 IRG as intermediate forage biomass NDVI Forage biomass Instantaneous Rate of Green-up (IRG) NDVI Spring Summer Autumn (Pettorelli et al. 2005, TREE; Bischof et al. 2012, Am Nat)
16 Relative odds of selection Deer track IRG during migration QIC = Movement towards higher/lower IRG
17 Predictions/Expectations Variable Tracking Memory Green-wave surfing Yes Perhaps Movement bias towards previous year s summer range Movement bias towards previous year s route No No Yes Yes Migratory route changes over time Yes No
18 Effect size Elevation Slope Aspect % cover Dist to roads TPI IRG INDVI Dist to prev route Direction to
19 Effect size QIC > Elevation Slope Aspect % cover Dist to roads TPI IRG INDVI Strong selection for the previous year s route and summer range Dist to prev route Direction to
20 Predictions/Expectations Variable Tracking Memory Green-wave surfing Yes Perhaps Movement bias towards previous year s summer range Movement bias towards previous year s route No No Yes Yes Migratory route changes over time Yes No
21 Does the route change over time? AID Width of line = approx. 1 km ~ 240 km migration
22 High fidelity to previous route AID Width of line = approx. 1 km ~ 240 km migration
23 High fidelity to previous route AID Frequency Median = 210m Distance from previous yea ~ 240 km migration
24 Predictions/Expectations Variable Tracking Memory Green-wave surfing Yes Perhaps Movement bias towards previous year s summer range Movement bias towards previous year s route No No Yes Yes Migratory route changes over time Yes No
25 The use of attribute memory Is the use of memory stronger when past experience was good? Expectation: Selection of previous route strengthens with better surfing the previous year
26 Previous year s surfing score based on 3-day running mean Date of Peak Forage Quality AID Forage Quality (IRG) Date of deer use Days from peak IRG 0 = surfing
27 Relative odds of selection Use of memory is stronger in areas where animals surfed better in the previous year Previous surfing s Poor Average Good QIC = Distance to previous years
28 Relative odds of selection Use of memory is stronger in areas where animals surfed better in the previous year Previous surfing s Poor Average Good QIC = Distance to previous years
29 Take home messages Deer have excellent spatial memory Memory is the driver of migratory behavior, green-wave surfing is secondary Adjustable memory use may result in adaptation to change
30 Habitat is environment animal s knowledge
31 Funding and Partners USDA NIFA postdoc fellowship (grant award # ) jmerkle@uwyo.edu
32 Thank you!
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