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Looking for Snails in Three MELNHE Stands. Stephanie Suttenberg, REU, SUNY ESF ‘17. Hubbard Brook Annual Cooperator's Meeting, W. Thornton, NH, July 10, 2014. Please see REU/RET conference slideshow for more recent results and interpretations.
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Looking for Snails in
Three MELNHE Stands
STEPHANIE SUTTENBERG
SUNY ESF ‘17
SHOESTRING CREW
Background
Snails are found in leaf litter (Oi layer)
Need to be damp
Snails need Ca (Skeldon et al 2007)
Watershed 1
Increase numbers
Not useable
Little research on N and P
Low phosphorus, lower growth (Krist 2014)
High nitrogen, higher snail population (Stuart A. 2014)
Hypotheses
More in N plots compared to control
More in P plots compared to control
More in Ca compared to control
More in N&P plot than N, P and control
Methods
Cardboards placed in C6, C8, JBO and JBM
Selected for Ca
Two 8.5x11in cardboard sheets are laid out in each
outer point
>.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
Randomized complete block design
ANOVA
Future collections
Collection Methods
Check underside of cardboard for
snails
Snails collected in pre-labeled vials
Randomized complete block design
ANOVA
Future collections
Results
0
2
4
6
8
10
12
C N P
N&
P Ca C N P
N&
P Ca C N P
N&
P Ca
C6 C8 JBO
Nu
mb
er o
f Sn
ails
Total Snails Collected in Fertilizer Plots
Results
0
2
4
6
8
10
12
C N P
N&
P Ca C N P
N&
P Ca C N P
N&
P Ca
C6 C8 JBO
Nu
mb
er o
f Sn
ails
Total Snails Collected in Fertilizer Plots • Compared to
Control
• N – Always
lower
Results
0
2
4
6
8
10
12
C N P
N&
P Ca C N P
N&
P Ca C N P
N&
P Ca
C6 C8 JBO
Nu
mb
er o
f Sn
ails
Total Snails Collected in Fertilizer Plots • Compared to
Control
• N – Always
lower
• P- lower in C6
and C8
Results
0
2
4
6
8
10
12
C N P
N&
P Ca C N P
N&
P Ca C N P
N&
P Ca
C6 C8 JBO
Nu
mb
er o
f Sn
ails
Total Snails Collected in Fertilizer Plots • Compared to
Control
• N – Always
lower
• P- lower in C6
and C8
• N&P- Always
lower
Results
0
2
4
6
8
10
12
C N P
N&
P Ca C N P
N&
P Ca C N P
N&
P Ca
C6 C8 JBO
Nu
mb
er o
f Sn
ails
Total Snails Collected in Fertilizer Plots • Compared to
Control
• N – Always
lower
• P- lower in C6
and C8
• N&P- Always
lower
• Ca – higher in
JBO
N and P decreased snail
abundance
0
1
2
3
4
5
6
7
8
9
10
C N P N&P Ca
Nu
mb
er
of
Sn
ails
Treatment
a
a b
c c
b
c
LS Means Blocked by Stand
Discussion
Hypotheses Outcome
NP
N&PCa
Discussion
Average of 3.4 snails/m^2
7.6 snails/m^2 (Skeldon et al
2014)
Leaf litter too damp?
Two phase model for N
Initial die off, but then favor snail reproduction
and survival (Stuart 2014)
Recently fertilized (June)
Future Research
More collections this summer
Taxa of individuals will be determined
Different forest types – not just northern
hardwood
Seasonal change
Varying levels of leaf litter dryness
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.
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
