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De La Salle University - Dasmarias

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WATER QUALITY ASSESSMENT OF DE LA SALLE UNIVERSITY-

DASMARIAS LAKE USING PHYTOPLANKTONAS INDICATOR

An Undergraduate Research Proposal Presented to the

Faculty of the Biological Sciences Department

College of Science


Dasmarias, Cavite

In Partial Fulfilment of the Requirements

for the Degree of Bachelor of Science in Biology Major in Human Biology

CRIZZIA PAOLA P. HERNANDEZ

GLORY GRACE E. ORTIGA

October 2011


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CHAPTER 4

RESULTS AND DISCUSSION

Initial Identification of Phytoplankton Species

This chapter presents table on initial identification of phytoplankton

species in the three stations. Phytoplankton was used as an indicator to assess the

water quality of the DLSU-D Lake. The researchers were able to identify

15species of phytoplankton present in the samples found in the three stations of

DLSU-D Lake. Table 1 shows the number of identified species in each site during

the first sampling on July.

Table 1 shows the number of pre-identified phytoplankton species in three

different stations during the first sampling which was on July. The researchers

were able to found 6294 total of all species in all stations. Most number of species

was found from Station 2 situated near the Lake Park with 3040 number of

species. Station 1 comes next with about 1839 species found. The least number of

species found was in Station 3which is located near at the Severino delas Alas

Alumni Hall with 1415 species.


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Table 1. Total number of Pre-identified Phytoplankton Species in three

stations during the month of July

Phytoplankton Species Station 1 Station 2 Station 3

Ankistrodesmus 1 8 0

Ceratium 0 2 0

Closterium 0 6 0

Cylindrospermum 1 1 0

Diatoma

Euglena

GomphosphaeriaMicrocystis

Pandorina

Pediastrum

Scenedesmus

Surirella

Synedra

Tetraedon

Ulothrix

363

76

121223

019

1210

203

0

572

23

19738

244

226140

171

35

323

184

7670

911

960

120

13

Total 1839 3040 1415

Figure 1 shows percentage composition of phytoplankton species found in

all stations. Based on the result, among the phytoplankton species found in the

DLSU-D Lake during the first sampling on the month of July, Gomphosphaeria

is the most abundant species in all stations having 63% composition followed by

Diatoma which is 20%.


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Figure 1. Percentage Composition of Phytoplankton Species found in three

stations at the DLSU-D Lake during the first sampling

Phytoplankton needs sunlight to survive because they convert the sunlight

into chemical energy, which is passed on up various food chains to support the

great variety of freshwater animals, including the fishes that are harvested by

humans. And because of this, phytoplankton forms the basis of almost all life in

the freshwater ( Hallegraeff, G. M., 2010).

Researchers found out that in the first sampling which was on July,

phytoplanktons were mostly abundant and visible. However, the local abundance

of phytoplankton varies horizontally, vertically, and seasonally. The primary

source of this variability is the availability of light (Reynolds, 2006). Month of

20%

4.49%

62.79%

1.08%7.04%

2.22%2.40%

Diatoma

Euglena

Gomphosphaeria

Pediastrum

Scenedesmus

Surirella

Other


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July is part of rainy season but at the time the researchers performed the sampling,

there is enough light that made the phytoplankton visible. There was an abundant

of species of phytoplanktons found within the first sampling, for the month of

July.

Fifteen (15) phytoplankton species were identified by the researchers, total

of 6294 species in all stations, six (6) out of fifteen (15) found to be an indicator

of pollution namely Ankistrodesmus, Closterium, Euglena, Pandorina,

Scenedesmus, and Synedra. Station 2 which has most indicator species found is

possible for organic pollution. Organic pollution occurs when large quantities of

organic compounds, which act as substrates for microorganisms, are released into

watercourses. Organic pollutants originate from domestic sewage (raw or treated),

urban run-off, industrial (trade) effluents and farm wastes (Lenntech, 2011).

Palmer score of organic pollution will be used to identify the severity of organic

pollution.
http://www.lenntech.com/aquatic/definitions.htm#compoundhttp://www.lenntech.com/aquatic/definitions.htm#compound


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CITED REFERENCES

(1)Hallegraeff, G. M. (2010). Ocean Climate Change, Phytoplankton CommunityResponses, And Harmful Algal Blooms: A Formidable Predictive Challenge

(2)Lenntech 2011. Water Treatment Solutions. [Internet]. [cited 15 October

2011] Available from http://www.lenntech.com/aquatic/organic-

pollution.htm

(3)Reynolds, C.S.(2006). The Ecology of phytoplankton. Cambridge

University Press, New York USA.

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