![Page 1: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/1.jpg)
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
![Page 2: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/2.jpg)
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)
![Page 3: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/3.jpg)
CDOM
Daphnia
Phytoplankton
Bacterial Production
HNAN, Ciliates
PNAN
![Page 4: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/4.jpg)
UV
CDOM
Daphnia
Phytoplankton
Bacterial Production
HNAN, Ciliates
PNAN
UV
scr
een
![Page 5: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/5.jpg)
I. Spatial distribution
II.Temporal Dynamics
III.Short-term experiment
IV. Implications
![Page 6: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/6.jpg)
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
![Page 7: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/7.jpg)
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
![Page 8: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/8.jpg)
II. Temporal Dynamics
Pipit Lake, Banff National Park
![Page 9: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/9.jpg)
II. Temporal Dynamics
Pipit Lake, Banff National Park
No significant correlation with DOC or chlorophyll
![Page 10: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/10.jpg)
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
![Page 11: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/11.jpg)
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
![Page 12: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/12.jpg)
![Page 13: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/13.jpg)
Incubation site
![Page 14: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/14.jpg)
Incubation site
Incubation site p<0.001
![Page 15: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/15.jpg)
Incubation site
Incubation site p<0.001
Water source p=0.005
Incubation x water ns
![Page 16: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/16.jpg)
Incubation site
Incubation site p<0.001
Water source p=0.005
Incubation x water ns
![Page 17: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/17.jpg)
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
![Page 18: Factors influencing the distribution and abundance of Daphnia middendorffiana in alpine lakes of the Canadian Rockies [Janet Fischer]](https://reader031.vdocuments.mx/reader031/viewer/2022020217/54038e158d7f72294d8b47a1/html5/thumbnails/18.jpg)
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