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GRASSLAND SET-ASIDE
Delta Farmland & Wildlife Trust
By Shawana Michalek, Sammy Penner and Maggie Stewart Student Researchers, British Columbia Institute of TechnologyThe effects of mowing a newly established GLSA on raptor bevaiour during winter
Mitigation Process
Project Scope
Methods
Findings
Management Implication
Question Period
AGENDA
Delta Farmland & Wildlife Trust
Grassland Set-aside Project
MITIGATION PROCESS
Delta Farmland & Wildlife Trust
Delta, BC Fraser River Delta Agriculture Fertile soil Economic/cultural
FarmDelta Farmland & Wildlife Trust
Delta, BC Critical habitat
Important Bird Area Small mammals Pollinators
Habitat Loss
Habitat
FarmDelta Farmland & Wildlife Trust
Delta Farmland & Wildlife Trust (DF&WT) Mitigates conflict Unites local farmers Promotes
conservation Six programs
Habitat
Farm
DF&WT
Delta Farmland & Wildlife Trust
Habitat
Grassland Set-aside Clover/grass Fallowed fields
Increases: habitat Soil fertility
GLSA
Farm
DF&WT
Crop
Delta Farmland & Wildlife Trust
PROJECT SCOPEGrassland Set-aside Project
Delta Farmland & Wildlife Trust
Objectives Mown vs. unmown
Vegetation Small mammals Raptor behaviour
GLSA age
Delta Farmland & Wildlife Trust
MownUnmown
Legend
Field Set-up 82 x 82m quadrants
3 mown 3 unmown Centered Tower
Delta Farmland & Wildlife Trust
Grassland Set-aside Project
VEGETATION METHODS
Delta Farmland & Wildlife Trust
Vegetation Surveys 2 randomized
transects 5 quadrats per
transect
Delta Farmland & Wildlife Trust
0.5m
QuadratMeasurements1. Average Height2. Percent Cover
Clover Grass Seed head Bare ground Thatch
Delta Farmland & Wildlife Trust
Grassland Set-aside Project
VOLE METHODS
Delta Farmland & Wildlife Trust
5m
Each quadrant = 25 traps
Vole Trapping Centered grids 150 traps
Delta Farmland & Wildlife Trust
Vole Data Mark re-capture Biological inventory Analyzed by
Minimum Number Alive
Delta Farmland & Wildlife Trust
RAPTOR METHODSGrassland Set-aside Project
Delta Farmland & Wildlife Trust
Raptor Survey 3 hour intervals Total of 96 hours Focal species: NOHA
Delta Farmland & Wildlife Trust
Raptor Data Behaviours
10 sec. intervals Flying high/low Touch-down Perching
605
10
15
20253035
40
45
5055
Delta Farmland & Wildlife Trust
Grassland Set-aside Project
FINDINGS
Delta Farmland & Wildlife Trust
80
50
Seasonal Evolution of Vegetative Cover (%)
October 2014 November 2014
March 2015
70
403020
10090
60
100
Mea
n Co
ver
(%)
Delta Farmland & Wildlife Trust
October
November
March
< 1 year old GLSA
4 year old – GLSA in March 2015
Delta Farmland & Wildlife Trust
Townsend’s Vole Low abundance
All traps empty Supported by
other researchers Population cycles GLSA age
Delta Farmland & Wildlife Trust
Northern Harrier hunting preference
n = 16
Delta Farmland & Wildlife Trust
Northern Harrier Mark re-capture
Northern Harrier hunting preference
n = 16
2014 - 152013 - 142012 - 132011 - 12Four years old Three years
oldTwo years old < 1 year old
10090
80
7060
50
40
30
20
100
Year of Study(Grassland Set-aside Age)
Delta Farmland & Wildlife Trust
Grassland Set-aside Project
MANAGEMENT
Delta Farmland & Wildlife Trust
Recommendations Maintain unmown
GLSA > 1 year old Continue research
Vole cycles Age of GLSA
Delta Farmland & Wildlife Trust
Conclusion DF&WT leadership
Vegetation Vole abundance Raptor behaviour
Multi-year data set Long-term
management
Delta Farmland & Wildlife Trust
ACKNOLEDGMENTSGrassland Set-aside Project
Delta Farmland & Wildlife Trust
A special thanks to…
Delta Farmland & Wildlife Trust: Christine Terpsma, Program Coordinator Mary Taitt, Chair Trevor Harris, property owner
British Columbia Institute of Technology Eric Anderson, Project Supervisor BCIT Instructors:
Danny Catt Tom Saare Kelly Hatfull Doug Ransome
Volunteers: Neusa Amboni, Dan Garney, Mary Tang, Krystal Brennan and Sean Chathom
Delta Farmland & Wildlife Trust
QUESTIONS?Grassland Set-aside Project
Contacts:Shawana Michalek [email protected]
Maggie Stewart [email protected]
Samantha Penner [email protected]
Delta Farmland & Wildlife Trust
Delta Farmland & Wildlife Trust
Bald Eagle observations (n = 70)
Red-tailed Hawk (n = 7)
Recorded from 29 October 2014 to 25 January 2015.
Delta Farmland & Wildlife Trust
Great Blue Heron observations (n = 8)
Recorded from 29 October 2014 to 25 January 2015.
Delta Farmland & Wildlife Trust
Delta Farmland & Wildlife Trust
Methods for calculatingMean Time (%) for NOHA FL
Delta Farmland & Wildlife Trust
Translating Raw Data
Mown Habitat Unmown HabitatSpecies
Sex Start Time
End Time
0:00
0:10 0:20 0:00 0:10 0:20
NOHA F 11:48 11:48 FH FL FH
Percent Time per observationMown Habitat Unmown Habitat
Species
Sex
Start Time
End Time
0:00
0:10
0:20 0:00 0:10
0:20
Time Interv
als
NOHA F 11:48 11:48 FH FL FH 3
NOHA M 12:53 12:53 FL FL 2
% of timeMown Habitat Unmown HabitatFH FL FH FL
=COUNTIF(range, "FH")/number of time intervals= 1/3 = 34%
=1/3 = 34%
=1/3 = 34% =0/3 = 0%
=COUNTIF(range, "FH")/number of time intervals= 0/2 = 0%
=0/2 = 0%
=0/2 = 0% =2/2 = 100%
Figure – mean time (%) per observation
Percent Time per species
Mown Habitat Unmown HabitatSpecies Mean % time
(FL)Mean % time (FH)
Mean % time (FL)
Mean % time (FH)
NOHA =sum%timeFL/#NOHAobserved=(34% + 0%)/2= 17%
=(34% + 0%)/2= 17%
=(34% + 0%)/2= 17%
= (100% + 0%)/2= 50%
% of timeMown Habitat Unmown HabitatFH FL FH FL
34% 34% 34% 0%
0% 0% 0% 100%
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