Something's FROGGY: Measuring Frog Abundance in Relation to Pond Quality


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Something’s FROGGY: Measuring Frog Abundance in Relation to Pond Quality By Dani, Andy, Mikala, Eric, and Marta

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Background Amphibians are important indicators of environmental health Live in habitats on land and in water, cutaneous respiration Native species of the Sierra Nevada are threatened by pesticides, fungal infection, and invasive fish How can we conserve them?

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Background In order to survive, they need a place to reproduce Sierran tree frogs are currently mating These frogs congregate in specific ponds, but can be found solitary in other locations

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Question/Hypothesis Why are Sierran Tree Frogs choosing to mate in certain ponds and not in others? How many frogs are congregating in certain areas? Hypothesis: A higher surface area, higher temperature, and high amount of vegetation will yield a higher number of frogs

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Study Site: 4 Ponds

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Ponds With Frogs Single’s Pond Pound Pond

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Ponds Without Frogs Baby Pond Angel Fish Pond

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Variables Measured Day % Cover of Vegetation Surface Area Depth Night Temperature Frog Abundance

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Methods: Vegetation Cover 1 m Vegetation: Percent cover estimated Rocks Herbaceous plants Woody plants Moss Grass Soil

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Methods Surface Area Longest length + width

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Methods Depth: In small ponds, depth measurement taken at the center In large ponds, taken along transect Pound Pond: depth measurement taken every 10 m Singles Pond: depth measurement taken every 5 m Temperature: Thermometer placed in each pond during the day and temperature measurements were taken at night

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Methods: Frog Abundance 5 1 4 2 3 1 2 3 10 9 4 5 7 6 8 Single’s Pond Pound Pond

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Results Frog Abundance Averages Single’s Pond = 3.5 Pound Pond = 61

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Discussion Size matters! Frogs may choose to mate in larger ponds because: More room Longevity Higher chance to mate Being in the vicinity of more frogs means a lower chance of predation No correlation between abundance and temperature Ponds that had shallow areas contained frogs

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Constraining Factors Replication Stubbornness

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Conservation Implications Hardy Species Conservation efforts should focus on large ponds and their surrounding area Both terrestrial (adult) and aquatic (eggs + larva) life stages

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Thank You!

Summary: Spring, 2018

Tags: student project