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Biological Assessment of Lucas Pond. Sierra Cantrell, Ron Irvin, Elizabeth Ng, John Tjaden University of Idaho Limnology Fall 2013 . Outline. Objectives Methods Data Suggestions. Objectives. What kinds of organisms? How many? Qualitative habitat assessment

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sierra cantrell ron irvin elizabeth ng john tjaden university of idaho limnology fall 2013

Biological Assessment of

Lucas Pond

Sierra Cantrell, Ron Irvin, Elizabeth Ng, John Tjaden

University of Idaho Limnology

Fall 2013

outline
Outline
  • Objectives
  • Methods
  • Data
  • Suggestions
objectives
Objectives
  • What kinds of organisms?
  • How many?
  • Qualitative habitat assessment
  • Can (more) fish be supported?
    • What steps are needed?
methods
Methods
  • Shoreline (littoral)
    • Macroinvertebrates
    • Sample surface of sediment
  • Open water (pelagic)
    • Zooplankton
    • Discrete samples
    • Integrated samples
slide5

3

B

C

A

2

1

littoral zone
Littoral Zone
  • D-ring kick net
    • Three sites
    • Area about 0.5 m2 (3 ft2)

Transect parallel to shore

slide8

Diptera

Coleoptera

Oligochaeta

Odonata

Plecoptera

Hydrozoa

Amphipoda

Gastropoda

Ephemeroptera

zooplankton
Zooplankton
  • Schindler trap

0.5 m

~1.5 ft

1.0 m

~3 ft

2.0 m

~6 ft

zooplankton1
Zooplankton
  • Wisconsin-style plankton net (Sites B, C)
    • Whole water column
slide12

Figure 2. Total estimated density of organisms per liter for entire water body from Schindler trap. Samples were taken from Lucas Pond on Oct. 9, 2013. Latah Co. Idaho, USA.

slide13

Figure 3. Total estimated density of organisms per liter for entire water body from Schindler trap, emphasizing the ratio of Ceriodaphnia to other Cladocera species. Samples were taken from Lucas Pond on Oct. 9, 2013. Latah Co. Idaho, USA.

slide14

Figure 4. Density per liter of Cladocera spp. (left) and Copepodaspp. (right) at depth of sample from Schindler Trapping. No data were collected at Site A at 2 m due to sediment disturbance. Standard error is shown for comparison. Samples were taken from Lucas Pond on Oct. 9, 2013. Latah Co. Idaho, USA.

Figure 5. Total estimated density per liter of Cladocera spp. and Copepodaspp. from Wisconsin plankton net samples. No data were collected from Site A due to sediment disturbance. Standard error is shown for comparison. Samples were taken from Lucas Pond on Oct. 9, 2013. Latah Co. Idaho, USA.

slide15

Figure 6. Density of organisms as a percentage of total density in the water body from Schindler trap samples. Samples were taken from Lucas Pond on Oct. 9, 2013. Latah Co. Idaho, USA.

factors conducive to fish production
Factors conducive to fish production
  • Ground water input
    • Consistent water levels
  • High dissolved oxygen
  • Size of pond economically manageable
areas for improvement
Areas for improvement
  • Littoral structure
    • Few aquatic plants
    • Grass carp
  • Little fish food
  • Low phosphorous concentration
    • Low productivity (chlorophyll a)
suggestions
Suggestions
  • Enhance littoral structure
    • Rooted aquatic plants
      • Reduce grass carp
      • Plantings
    • Add non-biotic structure
  • Increase productivity
    • Fertilize with phosphorus
  • Introduce prey fish
  • Monitor progress