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Stoneflies (Insecta; Plecoptera) in small upland streams in the Cape Breton Highlands, Nova Scotia:
Diversity and responses to forest harvest practises
Jeffrey B. Ogden, MSc candidateMount Allison University
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Project Objectives
1. Baseline information:
Boreal highland stonefly biodiversity.
2. Relate to forest practice & stream characteristics.
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Hypothes
• Expect new species records for Nova Scotia.
• Stream systems most recently affected by forestry will have the lowest diversity of stonefly species.
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Cape Breton highlands
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Cape Breton highlands
• upland boreal forest region
• climax balsam fir forest
• harsh climate
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Forestry and the highlands
• Pre 1900s
• 1920s - pulp and paper• 1970s – spruce
budworm infestation
• Present activity
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Previous studies in highlands
• Limited …due to accessibility
• Primarily in lower elevations
• 1st aquatic study in boreal region
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Physical Habitat Characterization
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Stonefly sampling
• Sampling was conducted along a 15-20 m study reach
• Emergence traps
• Benthic sampling
• Spring, summer
and fall
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Stonefly sampling
• Sampling was conducted along a 15-20 m study reach
• Emergence traps
• Benthic sampling
• Spring, summer
and fall
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Stonefly sampling
• Sampling was conducted along a 15-20 m study reach
• Emergence traps
• Benthic sampling
• Light traps
• Foliage sweeps
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Statistical analysis
• Only the benthic data used for analysis of forestry patterns
• ANOVA after transforming as necessary
• Exploratory multivariate statistics
- cluster analysis and PCA
• No pattern with measured variables
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Results
• Physical characteristics of the streams
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Results
• Stonefly diversity:
3300 stoneflies collected
2750 nymphs and 550 adults
31 stonefly species from eight families
8 new records for NS
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Stonefly diversity in the boreal streams
• Low stonefly diversity is natural in small cold-water springs
• Shredder dominated
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Winter stoneflies
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Conclusions
• Impact of forestry activities on stoneflies?
• No significant differences
• Stonefly abundance
• Buffers
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Conclusions
•Stonefly diversity naturally low
•Forestry impact “buffered”
•More fun work to be done
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ACKNOWLEDGMENTS
• Mount Allison University
• University of Prince Edward Island
• NSERC /NSDNR
• Stora Enso/NewPage
• My supervisors and committee members Dr. Ron Aiken (MTA), Dr. Dave McCorquodale (CBU), and Barry Taylor (StFX) my external examiner
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QUESTIONS??
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0 200 400 600 800 1000
Linkage D istance
Leuctra
Amphinemura
A llocapnia
Sweltsa
Isoperla
Taeniopteryx
Pteronarcys
Agentina
Paragnetina
M alirekus
Isogenoides
Z apada
Nemoura
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50 100 150 200 250 300 350
Linkage D istance
R3
L2
M 1
L1
L3
M 3
M 4
M 2
L3
R2
R4
R1