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A Limnological Assessment: The Lucas Pond. Christian Brown Dylan Gollen Taylor Lasley John Novak. Overview. Objectives Methods and Materials Results Discussion Implications. Team Objectives. Sediment Analysis. Macro Invertebrate Assessment. Identify species present

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a limnological assessment the lucas pond

A Limnological Assessment: The Lucas Pond

Christian Brown

Dylan Gollen

Taylor Lasley

John Novak

overview
Overview
  • Objectives
  • Methods and Materials
  • Results
  • Discussion
  • Implications
team objectives
Team Objectives

Sediment Analysis

Macro Invertebrate Assessment

Identify species present

Enumerate densities

  • Water content
  • Organic matter
methods and materials
Methods and Materials

Field Equipment

Lab Equipment

Digital scale and weigh boats

Oven

Metric ruler

  • KB Core sampler
  • Ekman grab sampler
  • Pencils, notebook, tape
  • Storage containers
methods and materials1
Methods and Materials

Sampling Design

  • KB core and Ekman samples were taken in a balanced manner that encompassed the greatest area of the pond
    • Seven samples total for each sampling method
    • Two samples from east and west sites
    • Three replicates from middle site
methods and materials3
Methods and Materials

Analyzing KB Core Samples

Water Content

  • measured total core depth (cm)
  • removed 1cm sections
  • recorded wet weights of each section
  • placed samples in oven, then recorded dry weights

Percent Water Content = Wet weight-dry weight/wet weight

methods and materials5
Methods and Materials

Organic Matter

  • Placed dried samples into oven for burning
  • Recorded ash weight

Percent organic matter = dry weight – burn weight/ dry weight

methods and materials6
Methods and Materials

Benthic macro invertebrates

  • collected with Ekman grab sampler
  • Same sample sites
  • Samples filtered through wash bucket (remove sediment)
  • samples were stored and preserved in ethanol solution
  • species identified and enumerated using dissecting microscopes
  • densities were converted from Ekman volume (225cm2) to number per square meter
discussion
Discussion

Sediment Accumulation

  • Pond size
  • Steep catchment
    • Surrounded by granitic Gneiss rock
  • Allocthonous inputs from vegetation and rock
discussion1
Discussion

Benthic Macro-Invertebrates

  • Relatively high abundance
  • Chaoborus, Chironimids, and Oligochetes contribute to bioturbation(Ademek et al. 2009)
    • Mechanical mixing of sediment through construction of feeding tubes and burrows
    • Affects transport of nutrients, particularly P and N
    • Increases oxygen penetration into sediment which enhances mineralization process by which nutrients are released into the overlying water
    • Inhibition of phytoplankton and benthic macrophyte growth
    • Chironomid larvae can increase nutrient enrichment which can eventually lead to eutrophication
implications
Implications
  • When considering the benthic aspects of the Lucas pond the longevity is dependent upon:
    • High rates of total sediment and organic matter accumulation
    • Unchecked population of benthic macro invertebrates could diminish pond water quality through process of bioturbation
literature cited
Literature cited
  • Ademek, Z. Marsalek, B. 2013. Bioturbation of sediments by macroinvertebrates and fish and its implication for pond ecosystems: a review. Aquaculture Int. 21:1-17
  • Brainard, A. S. Fairchild, G.W. 2012. Sediment characteristics and accumulation rates in constructed ponds. Journal of Soil and Water conservation. Vol. 67, no. 5. pp. 425-432