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Vernal Pools
What?How?Where?Why?
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What is a vernal pool?
• Vernal is derived from the Latin word for spring
• A vernal pool is a seasonal pool that is present in the spring and dries up in late spring or summer
February March June November
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How and where?• Remnants of lava
plateau along Hwy 15 corridor
• Surrounding softer geology erodes leaving mesas– Dense; less porous
• Examples:– Mira Mesa– Miramar– Santa Rosa Plateau
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Why are vernal pools important? Sustainability of an
unique ecosystem
• Fairy Shrimp– Within days, dormant embryos
(that can be up to many centuries old) develop into adults
• Copepods, Daphnia, other crustaceans, and flatworms
• Insects & insect larvae• Aquatic snails• Tadpoles, Frogs, toads• Snakes• Birds
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Why don’t we see more of these?
• Most vernal pools are gone– Less than 10% remain
in Southern California• Human impact
– Development– Pollution
• …but with a bit of education, protection, and restoration
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Miramar Campus
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