Lake Level Change in Large Lake Systems:

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Lake Level Change in Large Lake Systems
Implications for Interpreting Records of Salmon
History in the Lake Clark - Iliamna Region,
Alaska
Patricia A. Heiser Geology Department University
of Alaska Anchorage
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How might lake level change create velocity
barriers or falls that block salmon?
Lake Iliamna
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Holocene Trends in Alaska Sockeye Salmon
d15N
d15N
0
1000
2000
Year BP
3000
4000
5000
6000
Karluk Lake
Iliamna Lake
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Holocene Trends in Alaska Salmon and Climate
Climate
d15N
d15N
0
LIA
1000
MW
?
2000
Neoglacial
Year BP
3000
4000
5000
Hypsithermal
6000
Karluk Lake
Iliamna Lake
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paleo-shorelines of Lake Clark
Olgas Pond
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Tommy Lakes
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top
0
100
200
300
400
tephra
tephras
organics
glacial lake clay
transition
100
200
300
400
500
bottom
DNA sample
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fibrous organics
OP-2R3
589040 cal BP
OP-3R
OP-5R
648080
OP-6R6
tephras
12500100
Olgas Pond
transition from large glacial lake to small
isolated pond
14270180
glacial lake clay
OP-10R5
OP-11R4
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Tlikakila
Lily
Kijik
197050 cal BP
567060
12,100700
11,40060
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Tommy Lake
2535185 cal BP
Escalante
589040
648080
13,200180
15330540
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Tlikakila
Tommy
Escalante
Tlikakila
Lily
15,000
Olga
28 m
13,200
13,000
12,300
11,500
18m
14,500
8? m
2 m
2 m
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Transect Line

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Correlating Profiles
Gradual
Episodic
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SE shore
NW shore
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Lab analysis cont.

• Scanning Electron Microscopy to analyze glass
  shard morphology.
• SEM images pilfered from A.M. Sarna-Wojcicki
  tick marks 100 microns apart

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Tommy Lake
2535185 cal BP
fibrous organics
589040
648080
tephras
12500100
transition from large glacial lake to small
isolated pond
14270180
glacial lake clay
Olgas Pond
15330540
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