Bathymetry and Water Chemistry of the Lucas Pond
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Transcript of Bathymetry and Water Chemistry of the Lucas Pond
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Bathymetry and Water Chemistry of the Lucas Pond
Mikaela Campbell, Jeff McDonald, Joshua Stedman, & Sierra Grove
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Background
Limnological Chemical and Physical Analyses• Temperature profile• Dissolved oxygen profile• Conductivity profile• Light irradiance • Total phosphorus• Chlorophyll a
Importance of Chemical and Physical Analyses• Ecological and economical reasons
Consequences of Poor Management• Algal Blooms• Fish Kills• Economical impacts
www.reefnation.com
www.indosupply.com
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Background Continued
Bathymetry• Is the study and mapping of underwater depths of a body of water
Importance of Bathymetry • Navigation• Possible fish locations• Where aquatic vegetation might occur
How did we get this data?
www.noaa.gov
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Lucas Pond
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Goals
•Increase Water Quality •Create a Sustainable Fishery
www.nastaev.com
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MethodsBathymetric Mapping
• GPS points and depths recorded using Humminbird 365idual beam transducer unit
• Mapped collected points using DrDepth software
Water Volume and Sediment Deposition• Surface area * avg. depth• Sediment depth * area
Chemical Water Properties• Used YSI-55 to develop profiles• Used van Dorn sampler to take triplicate samples
of Chlorophyll a and total phosphorus at deepest point within the pond
www.stoichiometry.com
www.water-research.net
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Results
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Physical Results
• Deepest Point was 7.5ft (~2.5m)
• Average Secci Depth was 1.29m
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Physical Results
• Low Water• Volume 9.617e^004
ft3
• Area 2.289e^004 ft2
• Average Depth 4.2ft
• High Water• Volume 1.522e^005
ft3
• Area 3.219e^004 ft3
• Average Depth 4.7ft
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Results - Total Phosphorous• Total P – ranged
from 52-60 µg/L• Greatest at
depth of 1m• Also the most
varied
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Results - Chlorophyll-a
• Ranged form 12.35 (SE 0.33) at the surface to 23.62 (SE 1.18) at 2m of depth.
• Low Readings• Makes sense
because of the low P levels
8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.000
0.5
1
1.5
2
2.5Chlorophyll a (µg/L)
Dept
h (m
)
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Results
● Gathered with a YSI-85
● Low readings
● Change at 1.5m of depth
(µg/L)
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Discussion - Total Phosphorus and Chlorophyll-a❏ Total Phosphorus (mean 55.83 µg/L)
❏ Low total phosphorus limits the amount of primary production
❏ Chlorophyll-a (mean 14.91) ❏ Primary production low due to phosphorus
limiting ❏ Nutrient Supplementation would increase the
available total P and increase 1o production
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Discussion - Temperature
❏ Temperature
❏ Isothermic - mean 10.2 oC and 0.27 std dev
❏ In the summer pond may exceed 20oC and thus would not be suitable for cold water species such as trout
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Discussion - Oxygen
❏ Oxygen remains high from surface to 2 m (10.85-9.84 mg/L)
❏ 2.5 m drops to 3.5 mg/L creating a habitat that is unsuitable to fish
❏ 0-2 m oxygen levels suitable for fish to occupy❏ When pond warms, anoxic conditions may
exist throughout the pond
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Management Plan• Artificial habitat - fish attractors, blocks, etc.
• Aeration - Prevent anoxic conditions
• Nutrient Supplementation• Increase food base
• Stocking of fishes - Sport and Forage
maxresdefault.jpg
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Artificial Submerged Habitat
southernsportsmanaquaticsandland.com structurespot.com
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Aeration❏ Improve water quality
❏ Circulate pond and keep nutrients available
❏ Decrease likelihood of winterkill
❏ Increased dissolved oxygen
(Willis et al. 2010, Austin et al. 1996)www.a-wfitness.com
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Aeration
organicpond.com
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Fertilization
❏ Inorganic fertilizer of 20-20-5 (20% N, 20% P205, and 5% K20)
❏ Found to support four to five times more biomass than unfertilized ponds (Willis et. al 2010) and has a direct effect on phytoplankton.
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Fertilization
alafarmnews.com
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Trophy Bass❏ Stock fingerling
largemouth bass after fertilization (Austin et al. 1996)
❏ After four years reduce densities of 20-38 cm LMB to allow for rapid growth of remaining fish
❏ Release fish over 38 cm, except for the occasional trophy(Willis et al. 2010).
largestfreshwaterfish.com
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Forage Fish❏ Abundant and diverse
prey base
❏ Rainbow trout are great option because they will not reproduce in a pond
❏ Alternative angling
dnr.maryland.gov
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Citations
Austin, M., H. Devine, L. Goedde, M. Greenlee, T. Hall, L. Johnson, and P. Moser. 1996. Ohio pond management handbook:
a guide to managing ponds for attracting wildlife. Ohio Department of Natural Resources. Accessed 12/9/13.
Burns, N.M., Rockwell, D.C., Bertram, P.E., Dolan, D.M., and Ciborowski, J.J.H. 2005. Trends in temperature, secchi depth,
and dissolved oxygen depletion rates in the central basin of Lake Erie, 1983-2002. Journal of Great Lakes Research 31: 35-49.
Wetzel, Robert. 2001. Limnology. 3rd Edition. Academic Press. 1066 pp.
Wilhelm, F. M. 2013. Lecture. Fish 415 Limnology. University of Idaho
Wilhelm, F. M. 2013. Laboratory Session. Fish 415 Limnology. University of Idaho
Willis, D.W., R.D. Lusk, J.W. Slipke. 2010. Farm ponds and small impoundments. Pages 501-537 in W.A. Hubert and M.C.
Quist, editors. Inland fisheries management in North America, 3rd Edition. American Fisheries Society, Bethesda, Maryland.
.