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SUMMARY OF INDICATORS 2019
Porcupine Caribou Herd
Presentation to: Annual Harvest Meeting Inuvik, NT February 12-13, 2019 By: Porcupine Caribou Technical Committee
Porcupine Caribou Herd SUMMARY OF INDICATORS 2019 Presentation to: - - PowerPoint PPT Presentation
Porcupine Caribou Herd SUMMARY OF INDICATORS 2019 Presentation to: - - PowerPoint PPT Presentation
Porcupine Caribou Herd SUMMARY OF INDICATORS 2019 Presentation to: Annual Harvest Meeting Inuvik, NT February 12-13, 2019 By: Porcupine Caribou Technical Committee Range of Porcupine Caribou Herd Population Harvest Body Condition
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Overview
Population Harvest Body Condition Habitat
Alaska Department of Fish and Game
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Methods Results
Count caribou using a
photocensus
Last completed in 2017
July 1st , 2017 Alaska July 4th , 2017 Yukon Photo-direct technique and
digital photography
Population estimates
scheduled every 2-3 years (2019)
Population Size
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Population Size
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Methods Results
218,457 caribou
(202,106 - 234,808)
Minimum count =
197,894 caribou
Increasing (λ=1.35)
similar to growth rate between 1972-1989.
Population Size
25000 50000 75000 100000 125000 150000 175000 200000 225000 250000 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 Upper CI Lower CI 218,000 caribou in 2017
Population Size
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Methods Results
Classify pregnancy on
calving grounds (2018)
88% of females pregnant Long term average of 82%
Check to see how many
calves survive after 1 month
88% of those calves survived Long term average is 86% After 1 month: 64 calves per
100 cows
Calf Birth Rate and Survival
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Methods Results
Percentage of females
that survive each year
Last completed in 2017 95.4% of adult females
survived (83.9%-98.2%)
Survival is estimated
using GPS collar data
From 2012-2017, survival
ranged from 79.6%-94.5%
Adult Female Survival
Annual Survival of Adult Female Porcupine Caribou (Error bars are 95% confidence limits Female Annual Survival
Caribou Year (calving to calving period)
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Herd at the highest
recorded population size
High adult female
survival
Calf-cow ratio higher
than average
Pregnancy rate higher
than average
Calf survival average
Population Roll Up
Alaska Department of Fish and Game
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Overview
Population Harvest Body Condition Habitat
Peter Mather
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Methods
1.
Interview based sampling survey of user groups
Harvest estimates, sex ratio of harvest Review these later today
Harvest Monitoring
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Overview
Population Harvest Body Condition Habitat
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Methods Results
How healthy individual
caribou are by measuring back fat and rating animals
Fall and winter 2017-
2018 hunter samples submitted (Old Crow and NWT)
15 bulls sampled for back
fat
Caribou Body Condition
Generally – very good
shape for time of year
Average score of 3.2/4
which is above the five year average (2.9/4)
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Caribou Body Condition
Average condition of harvested caribou 1=poor, 2=fair 3=good 4=very good
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Caribou Body Condition
Average Depth of Backfat (cm)
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Overview
Population Harvest Body Condition Habitat
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Methods Results
Wildland Fires
Amount of PCH range
burned as an index of range condition
1960—2017 Fires in red are new as
- f 2017
2018 data not yet
available however no significant fires noted
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Wildland fires in PCH Range
In 2016 there were 9 fires in Alaska, and no fires within the YT and NWT portion of the PCH range In 2017, 53 fires burned in AK and YT
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Wildland fires in PCH Range
A fraction of the area burned in the previous 5 years Total area burned is roughly 17% of herd’s total annual range since 1960 2017 saw an additional 2% of the range burn that had not been burned since 1960
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Methods
Human Disturbance and Footprint
Measured total linear
footprint for each disturbance type
No appreciable change in
linear footprint in 2017/2018
Oil and gas lease sales
and winter seismic testing proposed for 1002 lands in Alaska
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Methods
Snow Conditions
Index of winter
conditions
Measurements of depth
and snow density measured at 17 permanent locations
1977-2018
Alaska Department of Fish and Game
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Snow Conditions
No trends or large changes from long term averages Old Crow and Ogilvie = average snow depth and density Eagle River drainage = increasing trend towards a deep snowpack over the last decade
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Snow Conditions
Winter distribution in Alaska between Arctic Village and the Dalton Highway Snow depth and density was above average in the Eagle Region, but near average in the Ogilvie and Old Crow regions
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Habitat did not change
much over the year
Snow conditions
average in most places except for the Eagle Region
Habitat Roll Up
Alaska Department of Fish and Game
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Questions?
Peter Mather
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Indicator Table - Nov. 2018
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Indicator Table - Nov. 2018
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