Water analysis of a closed ecosystem Essay


The lab intended to imitate a closed ecosystem, and all of the factors that a peculiar system possesses. Examples of discernible factors were nutrient ironss, alimentary rhythms, and chemical procedures. Over clip, one was able to see the factors of the column and how they coalesced within a fake ecosystem.


Using a complex mixture of techniques, the lab posed several factors of observation. The adviser provided building and readying of the construction of the eco-column prior to the testing. The column was working on 9/17/13 and lasted until 12/03/13 roll uping 78 yearss of usage. This allowed for ~ six proving events in which dirt and H2O quality was tested.

Execution of Biotic and Abiotic Material: All stuffs were gathered over a timespan of seven yearss ( 9/11/13-9/17/13 ) .

  • Thetellurian degreeof the eco-column consisted of collected stuffs such as: deposit from Equus caballus sphere, soil contained with come-on ( ruddy worms ) , ruddy worms, Armadillidium vulgare, centipedes, bullets, and a cricket.
  • Theaquatic degreeof the eco-column contained few stuffs such as: H2O from a local lake and rocks from a lakebed. Elodea was besides implemented into the aquatic chamber.
  • Thedecomposition degreeof the eco-column had stuffs such as: decomposition apples, hay, and foliage litter.

Water Quality Testing: several facets of H2O quality were tested over a timespan of several hebdomads ( 9/24/13-12/03/13 ) .

  • pH Testing: The pH was tested utilizing a investigation in which a group member would shoot into the H2O, and subsequently rinse and clean with distilled H2O.
  • Dissolved Oxygen Testing: The D.O. degrees were taken via investigation, a member would guarantee the preciseness of the device so carefully move the investigation around the H2O. After utilizing the investigation a member would rinse and clean with distilled H2O and shop the investigation decently.
  • Turbidity Testing: The turbidness was tested utilizing a mechanism and phial to find the H2O lucidity. A group member would rinse the phial with the H2O that was to be tested. After infixing the phial into the machine, the member would rinse the phial with distilled H2O.

Soil Quality Testing: First, a member would blend dirt with H2O into a container, due to lucidity issues we waited an excess hebdomad every dirt trial. After the H2O was useable, a member would utilize a pipette to pull out and travel into a testing container.


Water Analysis


Dissolved Oxygen






1.5 mg/L


21.8i‚° C

37.5 NTU



1.1 mg/L


22.8i‚° C

72 NTU



1 mg/L


20.8i‚° C

125.4 NTU

— –


1.2 mg/L


20.4i‚° C

153.4 NTU

— –


3 mg/L


17.2i‚° C

— –



6.8 mg/L


17i‚° C

65.4 NTU

— –

In figure 1, one is able to see an highly low norm of dissolved O consequences. This is likely caused by the deficiency of O in the chamber by eutrophication, the algae uses all of its needful foods until it runs out and dies. Once the algae dies aerophilic bacteriums begin to eat off at the dead affair. As they consume they are besides utilizing O, which causes the O degrees to take down and brings decease to all living things within the chamber. Figure 2 illustrates the turnaround point in dissolved O as it starts to lift between 11/5/13 and 12/3/13.


  1. IdentifytwoFood Ironss or Food Webs in each of your home grounds ( Chamberss ) . Usepointersto exemplify these nutrient ironss and nutrient webs ; complete sentences are non required. Use excess paper if needed.
  • Aquatic Chamber
    1. In the aquatic chamber one there was a simple nutrient concatenation, in most instances merely bacteriums would feed on disintegrating algae.

disintegrating algae i? Bacteria

  • Decomposition Chamber ( top dirt chamber )
    1. Another signifier of a simple nutrient web was in the decomposition chamber, where the fruit flies would feed on the decomposing organic stuffs.

decomposing organic stuff i? fruit flies

  • Tellurian Chamber
    1. With a assortment of beings in the tellurian chamber, a nutrient web was apparent. Fruit flies, bullets, Armadillidium vulgare, worms, a cricket, and centipedes all formed a nutrient web.

Plant leaves i? Armadillidium vulgare, centipedes, bullets, and cricket.

Disintegrating affair i? worms and fruit flies.

  1. Identify and briefly discuss the biogeochemical rhythms which are taking place/which are present in your EcoColumns. Do non simply province that “they are all present” ; alternatively, supply more specific information.

Unlike the other groups, this peculiar column endured inhabitable fortunes. These fortunes like extra foods taking to eutrophication caused the full system to be off balance. The off balance state of affairs caused all biogeochemical rhythms to move in an unknown manner, where foods fluctuated in off-set forms.

  1. Is your ecosystem column aclosedorunfastenedsystem? — – or is it something in between a closed or unfastened system?Explainhow this ( closed, unfastened or other ) influences the ecosystem column overall.

The column was a closed system, where what was indoors of the column stayed. Though the column was sealed, beings were able to boom. For illustration, the fruit flies reproduced quickly throughout the full map. The lab was a simulation so there was no true “ecosystem, ” though most facets of the existent universe were covered.

  1. What sort of niches are available/present for the assorted beings in the column? Be specific, descriptive, and utilize nomenclature that is pertinent to the subject.

Within the timespan of the eco-column, one was able to see a few niches. One illustration would be the spacing of the bullets. Every bullet seemed to hold their ain country, for they were ne’er near to one another. As of 10/1/13, members were able to find a deficiency of life beings within the column. This ruin of life within the column made many niches impossible to record.

  1. Discuss grounds ofecological sequencetaking topographic point in your column ( or in the column of another lab group if you have non observed any marks of sequence in your column ) .

A gradual alteration was apparent within the eco-column. After a few hebdomads of operation, members were able to see a drastic lessening in life beings. Besides, the H2O quality drastically changed, dissolved O degrees reached low consequences ( 1.0 mg/L – 3.0 mg/L ) . These procedures were likely to turn over the full system due to extra foods.

  1. Discuss thestablenessandsustainabilityof the ecosystem columns in the lab, including your ain.

Other than two groups all columns was easy considered stable and sustainable. In the instance of the column in which this study covers, things bottomed-out. Specifically in the aquatic chamber, group members viewed monolithic loss of proper foods. For illustration, turbidness degrees were slightly stable at the beginning, mean around 37.5 NTU, but finally roared in Numberss and maxed at 153.4 NTU.

  1. Discusthreetendencies or forms which stand out as you think back on the information which you have been entering for 6 hebdomads. These tendencies or forms should use to the H2O quality trials or other observations which you have made over this multi-week clip period. Briefly discuss these three tendencies or forms, supplying possible accounts based on environmental scientific discipline rules.

Low Dissolved Oxygen Levels: In the aquatic chamber members seen drastic loss of foods. The low consequences of D.O. was an index of the alimentary loss. For five back-to-back hebdomads consequences were & lt ; 5.0 mg/L, and this proves an issue in foods.

Rising Turbidity Degrees: Throughout the observations turbidness degrees rose every testing. This is likely due to the loss of needed foods. When the food degrees lessened the sum of dead organic affair built up, in bend this made the H2O more turbid.

The Slow Return of Stability: Though the bulk of proving was considered low and inadequate for a stable ecosystem, a gradual return of stableness was apparent. The last testing twenty-four hours proved this statement, for all of the classs of H2O proving leveled out and began to be considered more desirable for a stable ecosystem.

  1. Explain what eutrophication refers to and how this occurs. Use this account to your ecosystem column. How might eutrophication take topographic point in your column? Explain to the full.

Eutrophication occurs when there are extra sums of foods, and algal blooms enter the aquatic zone. The column tested in this study underwent eutrophication due to extra foods. The procedure brought hurt to the stableness of the column, for the algae consumed most of the foods and finally shut the aquatic chamber off from stableness.

  1. Pick another group in your category. How make your informations comparison to theirs? Brainstorm some causes/reasons for any differences.

Group 1 ( Julius, Alondra, Mariah, Maggie )

Dissolved Oxygen: 1.5, 1.1, 1.0, 1.2, 3.0, 6.8

Turbidity: 32.5, 72, 125.4, 153.4, — – , 65.4

pH: 5.5, 6.89, 7.05, 7.85, 8.4, 7.63

Temperature: 21.8, 21.8, 22.8, 20.8, 20.4, 17.2, 17

Group 2 ( Jenny, Ying, Yang, Jilda )

Dissolved Oxygen: 5.2, 7.4, 7.8, 7.0, 3.0,

Turbidity: 29.9, 37.6, 35.1, 44.5, 34.5

pH: 6.24, 7.2, 6.01, 7.08

Temperature: 21.7, 21, 21, 17.9

A difference in variables is apparent, the most likely cause is group one’s loss of proper life demands. An illustration of a deficient component necessary for life is the dissolved O, group two really has stable Numberss, while group one has highly low sums. The likely cause of group one’s inability to prolong is the extra sum of foods that were introduced into the system. The extra foods caused eutrophication ; the algal blooms merely catch the aquatic chamber and caused a concatenation reaction of ruin.

  1. Finally, reference any beginnings of mistake in this lab. This should be narrated in a “cause and effect” mode and speak about specific jobs. A good illustration would be “water did non run out from the tellurian chamber so …” while a bad illustration would be “we messed up the mensurating one day.”

A major mistake occurred on the proving twenty-four hours 12/03/13, two members improperly attempted to prove the dirt. Unlike other proving yearss, the members shook the H2O, which disturbed the lucidity doing it impossible to prove, and caused any consequences to be faulty.


This lab posed a assortment of acquisitions, and invoked a greater position of an ecosystem. This stands true because one was able to see an full system on a much smaller graduated table. The importance of biogeochemical rhythms was understood. The complexness of an ecosystem was learned, and grasp of a true ecosystem was gained.


Houston, H. ( 9/18/13 ) . Eco-column Help.AP Environmental Class. Lecture conducted from Bunker Hill High School, Claremont, NC.

Botkin, D. B. ( 2010 )Environmental Science: Earth as a Living Planet. Danvers, MA: John Wiley & A ; Sons, Inc.

Baily, Jeffery. “ UCSB Science Line sqtest. ” UCSB Science Line sqtest. National Science Foundation, n.d. Web. 19 Dec. 2013. & lt ; hypertext transfer protocol: //scienceline.ucsb.edu/getkey.php? key=1258 & gt ; .

Goble 1