Lakes, etc'

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Lakes, etc.
Shell Lake
Mono Lake
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Eutrophication Lake Tahoe
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Mono Lake Brine Shrimp(AKA Sea Monkeys)
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(No Transcript)
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The Paradox of the Plankton
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Freshwater phytoplankton
Asterionella
Cyclotella
Which species requires more silicate (key
component of outer casing)?
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Each species is limited by a different nutrient
different nutrient ratios give rise to different
species mixes
Silicate/Phosphorous
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Daphnia species
Helmet
Spine
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Morphological variationphenotypic and genotypic
From Balcer et al.
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Helmet size in Daphnia retrocurva
What might cause such a difference?
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What eats Daphnia?

Also Leptodora, copepods, small fish
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The Red Queen Hypothesis
Brief article about evolving helmet size in
response to predation