Vernal Pool Study · 2016. 10. 15. · observed. At first there were often frogs and tadpoles, but...
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Vernal Pool Study Problem:To determine if the abiotic factors such as Nitrate level, pH level, Oxygen level and temperature affect the invertebrates of the vernal pool. Hypothesis:The abiotic factors, Nitrate, Oxygen, pH level, and Temperature will affect the amount of invertebrates in the vernal pool. 0 17.5 35.0 52.5 70.0 Sep 11, 2009 Sep 18, 2009 Sep 25, 2009 Oct 2, 2009 Oct 16, 2009 Oct 23, 2009 Abiotic Factors Graph Depth (cm) pH Nitrates Oxygen Level Temp (c) Date Dragonfly Larva Caddis Fly Mayfly Fingernail Clam backswimmer Daphnia Phantom Midge Giant Water Bug Frogs Water Scorpion Sep 11, 2009 Sep 18, 2009 Sep 25, 2009 Oct 2, 2009 Oct 16, 2009 Oct 23, 2009 14 8 10 0 5 2 7 0 0 0 7 3 2 2 3 15 15 1 0 0 4 1 0 7 4 17 5 1 1 0 3 4 16 10 1 2 17 0 0 1 1 3 5 4 1 9 19 1 0 0 3 3 36 13 1 5 4 2 0 5 Every Friday during September and October, the researchers sampled the Cathance River Preserve’s “Vernal Pool”. The pool was scooped with a large net seven times, its contents were dumped into a tub, and the invertebrates were identified and counted. A chart indicating common species in a healthy and unhealthy pond was used to determine health. This vernal pool had all of the organisms listed under the healthy category. In the first week there were quite a few dragonfly larva and backswimmers. Later on as temperature decreased and water level increased, less dragonfly larva and less backswimmers were observed. At first there were often frogs and tadpoles, but the tadpoles decreased as the temperature got colder. Based on CREA’s past observations, there was a lot more algae in the pool this year. Some other things noticed were, as the weather got colder the water depth increased and the pool’s water looked clearer. The dissolved oxygen doubled during the last week. Date Depth (cm) pH Nitrates Oxygen Level Temp (c) Sep 11, 2009 Sep 18, 2009 Sep 25, 2009 Oct 2, 2009 Oct 16, 2009 Oct 23, 2009 50.8 6 0 5 15 55.4 6 0 4 15 42 6 0 5 13 54.9 4 0 5 10 55 4 0 4 10 60.2 4 0 8 4 Net Used to Scoop Vernal Pool Abiotic Factors Aquatic Invertebrates observed Vernal Pool Tub with invertebrates in it By Tabitha Barnard and Kate Doughty Special Thanks to CREA, for use of the equipment, and also to Cheryl Sleeper, for all of her help. and support! Giant Water Bug Fingernail Clam Snail Tabitha at the Preserve
Transcript of Vernal Pool Study · 2016. 10. 15. · observed. At first there were often frogs and tadpoles, but...
Vernal Pool Study Problem:To determine if the abiotic factors such as Nitrate level,
pH level, Oxygen level and temperature affect the invertebrates of the vernal pool.
Hypothesis:The abiotic factors, Nitrate, Oxygen, pH level, and Temperature will affect the amount of invertebrates in the vernal pool.
0
17.5
35.0
52.5
70.0
Sep 11, 2009 Sep 18, 2009 Sep 25, 2009 Oct 2, 2009 Oct 16, 2009 Oct 23, 2009
Abiotic Factors Graph
Depth (cm) pH Nitrates Oxygen LevelTemp (c)
Date Dragonfly Larva Caddis Fly Mayfly Fingernail Clam backswimmer Daphnia Phantom Midge Giant Water Bug Frogs Water Scorpion
Sep 11, 2009
Sep 18, 2009
Sep 25, 2009
Oct 2, 2009
Oct 16, 2009
Oct 23, 2009
14 8 10 0 5 2 7 0 0 0
7 3 2 2 3 15 15 1 0 0
4 1 0 7 4 17 5 1 1 0
3 4 16 10 1 2 17 0 0 1
1 3 5 4 1 9 19 1 0 0
3 3 36 13 1 5 4 2 0 5
Every Friday during September and October, the researchers sampled the Cathance River Preserve’s “Vernal Pool”. The pool was scooped with a large
net seven times, its contents were dumped into a tub, and the invertebrates were identified and counted. A
chart indicating common species in a healthy and unhealthy pond was used to determine health. This vernal pool had all of the organisms listed under the healthy category. In the first week there were quite a few dragonfly larva and backswimmers. Later on as
temperature decreased and water level increased, less dragonfly larva and less backswimmers were
observed. At first there were often frogs and tadpoles, but the tadpoles decreased as the
temperature got colder. Based on CREA’s past observations, there was a lot more algae in the pool this year. Some other things noticed were, as the
weather got colder the water depth increased and the pool’s water looked clearer. The dissolved oxygen
doubled during the last week.
Date Depth (cm) pH Nitrates Oxygen Level Temp (c)
Sep 11, 2009
Sep 18, 2009
Sep 25, 2009
Oct 2, 2009
Oct 16, 2009
Oct 23, 2009
50.8 6 0 5 15
55.4 6 0 4 15
42 6 0 5 13
54.9 4 0 5 10
55 4 0 4 10
60.2 4 0 8 4
Net Used to Scoop Vernal PoolAbiotic Factors
Aquatic Invertebrates observed
Vernal Pool
Tub with invertebrates in it
By Tabitha Barnard and Kate Doughty
Special Thanks to CREA, for use of the equipment,
and also to Cheryl Sleeper,
for all of her help. and support!
Giant Water Bug
Fingernail Clam
Snail
Tabitha at the Preserve
