Swan(sea) Song – personal research during my six years at Swansea ... and bey...
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Duval et al fish habitat
1. Strategic Aquatic Habitat
Conservation Opportunities for
Minnesota Lakes
Michael Duval
Peter Jacobson
Tom Jones
Minnesota Dept of Natural Resources
MN Association of Conservation Professionals
Camp Ripley, MN March 2, 2012 Photo courtesy of Bill Lindner Photography
2. Primary Categories of Fish Habitat in Lakes
Physical Structure Water Quality
Properties Properties
• vegetation • sedimentation
• woody habitat • epiphytic algae
• substrate • hypolimnetic oxygen
• regime shifts
Primary Disturbance Drivers
Shoreline Watershed
disturbance from disturbance from
development urbanization and
agriculture
5. Interaction of water
quality with fish species
140 a
ab
120
b
100 bc c
bc
IBI
80
60
40
20
Forest Forest Ag/For Ag/For/ Urban Ag
> 60% Urb
Drake and Pereira 2002. North American Journal of
Fisheries Management 22:1105-1123.
6. Interaction of
water quality with
physical habitats
Photo: Eric Engbretson
Scheffer et al. 2001. Catastrophic shifts in
ecosystems. Nature 413:591-596.
11. Primary Categories of Fish Habitat in Lakes
Physical Structure Water Quality
Properties Properties
• vegetation • sedimentation
• woody habitat • epiphytic algae
• substrate • hypolimnetic oxygen
• regime shifts
Primary Disturbance Drivers
Shoreline Watershed
disturbance from disturbance from
development urbanization and
agriculture
12. Cumulative effects of shoreline development on Lake Selection
fish habitat in northern Minnesota lakes • Northern Lakes & Forests
• Mesotrophic, TP 12-30 ppb
• High in watershed
GOALS
• Analyze shoreline development on 100
lakes
• Determine and model local habitat impacts
• Develop and test model to predict effects
of shoreline development on fish
100 Lakes: GIS
DNR U of M
30 Lakes: fish and habitat sites
Donna Dustin Bruce Vondracek
12 Lakes: whole lake habitat
Cindy Tomcko Jen Keville
Jessie Lepore
13.
14.
15. Interim
estimated
riparian lake
habitat
condition
Preliminary analyses
provided by Donna
Dustin, Fisheries
Research
17. Lake Habitat Condition Assessment
Minnesota Lakes Fish Habitat Condition
100
Watershed Disturbance (% disturbed land use)
75
50
25
0
0 0.5 1 5 10 50 100
Shoreline Disturbance (% developed within 75m)
18. Habitat Condition Assessment
Minnesota Lakes Fish Habitat Condition
100
Watershed Disturbance (% disturbed land use)
75
50
25
0
0 0.5 1 5 10 50 100
Shoreline Disturbance (% developed within 75m)
19. Visualizing
risk of WQ
100
habitat
Percent of Watershed Protected
80
degradation
60
40
20
0
0 20 40 60 80 100
Watershed Disturbance (% disturbed land use)
20.
21. Ten Mile Lake Watershed
Owner Acres %
County 7,106 27.9
State 5,342 20.9
Federal 6,154 24.1
Private 6,907 27.1
Total 25,510
$400,000 for 530 acres of private forest
conservation easements @$750/acre
would protect 75% of the total watershed
The lakes in the study are tiered such that different lakes will get different levels of attention. All 100 lakes will be included in the GIS analysis, where, in addition to the development buffers that I already discussed, we will try various methods to characterize the lakeshore remotely. The GIS only lakes are shown in orange.30 Lakes (blue dots) will be visited and we will sample habitat and fish at a number of sites, and ground-truth the GIS results. At 12 lakes (green dots) we will collect habitat data for the entire lake, so that we can develop whole-lake models of the effects of various habitat scenarios.