factors influencing the distribution and abundance of daphnia middendorffiana in alpine lakes of the...
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Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies. Presented by Janet Fischer at the "Perth II: Global Change and the World's Mountains" conference in Perth, Scotland in September 2010.TRANSCRIPT
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J.M. Fischer, M.H. Olson, J.C. Everhart, K.C. Rose, C.E.
Williamson, and R. D. Vinebrooke
Factors influencing the distribution and abundance of Daphnia
middendorffiana in alpine lakes of the Canadian Rockies
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Daphnia middendorffiana in fishless lakes
of the Canadian Rocky Mountains
• co-dominant crustacean species in fishless,
alpine lakes
• affected by temperature and DOM (which are
responding to climate change)
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CDOM
Daphnia
Phytoplankton
Bacterial Production
HNAN, Ciliates
PNAN
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UV
CDOM
Daphnia
Phytoplankton
Bacterial Production
HNAN, Ciliates
PNAN
UV
scr
een
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I. Spatial distribution
II.Temporal Dynamics
III.Short-term experiment
IV. Implications
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I. Spatial Distribution
Survey of 9 deep, fishless, alpine lakes in Yoho and Banff National Parks
http://www.pc.gc.ca/eng/docs/v-g/dpp-mpb/sec4/dpp-mpb4d.aspx
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I. Spatial Distribution
p=0.04
p=0.11
Survey of 9 deep, fishless, alpine lakes in Yoho and Banff National Parks
p=0.74
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II. Temporal Dynamics
Pipit Lake, Banff National Park
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II. Temporal Dynamics
Pipit Lake, Banff National Park
No significant correlation with DOC or chlorophyll
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III. Short term experiment to explore mechanisms
Hungabee • Contains Daphnia • Warmer, Higher DOM
Oesa • Daphnia absent/rare • Colder, Lower DOM
2 Incubation Sites
3 Water Sources
Hungabee water, Oesa water, DOM-amended Oesa water
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11 day incubation at 0.5 m Measured juvenile growth rate of Daphnia, a metric highly correlated
with population growth rate (Lampert and Trubetskovia 1996)
2x3 Factorial Design crossing Incubation Site and Water Source 5 replicates per treatment
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Incubation site
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Incubation site
Incubation site p<0.001
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Incubation site
Incubation site p<0.001
Water source p=0.005
Incubation x water ns
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Incubation site
Incubation site p<0.001
Water source p=0.005
Incubation x water ns
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I. Spatial survey
• positive effect of DOC
II. Temporal dynamics in Pipit Lake
• positive effect of temperature
III. Short-term experiment
• Effect of incubation site (Temperature and/or UVR)
• Effect of water source
• Not a simple effect of cDOM
Distribution and abundance of Daphnia middendorffiana in
alpine lakes of the Canadian Rockies
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Daphnia = a powerful
indicator of biotic
consequences of
climate change in
alpine lakes
Climate-driven variation in temperature, precipitation,
treeline, hydrology
Key physical/chemical variables in lakes such as
water temperature, DOC, nutrients, water transparency
Daphnia presence/absence, abundance, and juvenile growth