Stephanie snail REUcon
20
Looking for Snails in Four MELNHE Stands STEPHANIE SUTTENBERG SUNY ESF ‘17 REU SHOESTRING CREW
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HB REU/RET Conference presentation August 2014
Transcript of Stephanie snail REUcon
Looking for Snails in Four MELNHE Stands
STEPHANIE SUTTENBERG
SUNY ESF ‘17
REU SHOESTRING CREW
Background
Snails are found in leaf litter (Oi layer) Need to be damp -- desiccation
Snails need Ca (Skeldon et al 2007)
Watershed 1 Increase numbers Not useable
Little research on N and P Lower phosphorus, lower growth rate of individuals (Krist 2014)
Higher nitrogen, higher snail population (Stuart A. 2014)
v
Hypotheses
N
P
N&P
Ca
Methods Cardboards placed in C6, C8, JBO and JBM
Selected for Ca
Two 8.5x11in cardboard sheets are laid out in each outer point
>0.25 inch rain event top layers of leaf litter are dry
One plot
Collection Methods
Check underside of cardboard for snails Snails collected in pre-labeled vials Killed with 95% ethanol Later transferred to storage vials
Collected four times
Collection Methods
Check underside of cardboard for snails Snails collected in pre-labeled vials Killed with 95% ethanol Later transferred to storage vials
Collected four times
Co N P N&P Ca Co N P N&P Ca Co N P N&P Ca Co N P N&P CaC6 C8 JBO JBM
0
10
20
30
40
50
60
70
80
90
Average Snails Collected Summer 2014
Stand and Plot
Aver
age
num
ber o
f sna
ils
Co N P N&P Ca Co N P N&P Ca Co N P N&P Ca Co N P N&P CaC6 C8 JBO JBM
0
2
4
6
8
10
12
14
16
Average Snails Collected Summer 2014
Stand and Plot
Aver
age
num
ber o
f sna
ils81.75
Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca
C6 C8 JBO JBM
0
2
4
6
8
10
12
14
16
Average Snails Collected Summer 2014
Stand and Plot
Aver
age
num
ber o
f sna
ils81.75
Compared to ControlN- only increase JBO
Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca
C6 C8 JBO JBM
0
2
4
6
8
10
12
14
16
Average Snails Collected Summer 2014
Stand and Plot
Aver
age
num
ber o
f sna
ils81.75
Compared to ControlN- only increase JBOP- Only increase JBO
Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca
C6 C8 JBO JBM
0
2
4
6
8
10
12
14
16
Average Snails Collected Summer 2014
Stand and Plot
Aver
age
num
ber o
f sna
ils81.75
Compared to ControlN- only increase JBOP- Only increase JBON&P- No increase
Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca Co N P N&P
Ca
C6 C8 JBO JBM
0
2
4
6
8
10
12
14
16
Average Snails Collected Summer 2014
Stand and Plot
Aver
age
num
ber o
f sna
ils81.75
Compared to ControlN- only increase JBOP- Only increase JBON&P- No increaseCa- Increase except C8
12 17 22 27 320
2
4
6
8
10
12
14
f(x) = 0.281960489136123 x − 1.98929922153616R² = 0.254370998363817
Soil Moisture vs. Average Snails Collected
Soil Moisture
Avera
ge S
nails
Co N P NP Ca0
5
10
15
20
25
30
35
Least Squared Means
Treatment
p= 0.3
Co N P N&P Ca0
1
2
3
4
5
6
7
8
Least Squared Means (Without JBO)
Treatment
p = 0.09
a
b bb
a b
Discussion
Hypotheses Outcome
NP
N&PCa
Discussion
Average of 5.8 snails/m^2 7.6 snails/m^2 (Skeldon et al 2014)Leaf litter too damp?Edge effect?
Dry out faster Two phase model for N
Initial die off, but then favor snail reproduction and survival (Stuart 2014)
Recently fertilized (June). Die back stage?
Future Research
Taxa of individuals will be determined
Soil pH levels Soil composition Varying levels of leaf litter dryness
“Goldilocks zone”
Citations
Krist, Amy C., Adam D. Kay, Katelyn Larkin, Maurine Neiman. 2014. Response to Phosphorus Limitation Varies among Lake Populations of the Freshwater Snail Potamopyrgus antipodarum
Skeldon, M. et al 2007. Terrestrial gastropod response to an ecosystem-level calcium manipulation in a northern hardwood forest.
Stuart, A., & Palenzuela, N. 2014 Effects of fertilizer applications on survival and recruitment of the apple snail, Pomacea canaliculata (Lamarck). Crop Protection.
Wu, J. et al 2014. Identification of optimum scopes of environmental factors for snails using spatial analysis techniques in Dongting Lake Region, China. Parasites & Vectors.
Acknowledgements
I’d like to thank Eli, Jerome, Nora and Abby for setting out cardboards
Adam and Ruth for much needed advice in layouts, stats and methods
Eli, Lisa, Adam, Sophie and Justin for collecting snails
Matt Vadeboncoeur and Cheryl Bondi for helping with methods
