PROJEKT:

Vyskum vodnych ploch - biologicky
Gewaesseruntersuchung - biologisch
Water Examinations - biological

I. Participants


II. Project

Our group has indicated the quality of water from the stream, which flows near our hotel and is called MLYNICA.
We were looking for invertebrates living in this stream. The main method of catching them was using nets and overshoes. We have observed these little animals through stereoscopes.
We have marked the invertebrates using special tables with names of species and we have counted them approximately for each checkpoint. Some of the species we've found were bioindicaters, that's how we were able to define the class of water quality.
There are four classes of water's quality:
I , II-clean water
II, III-polluted water

We've added all of the numbers of water's quality and divided them by the quantity of bioindicators found in each point.
The results :
point 1-1,93
2-1,85
3-1,76
4-1,88
5-1,33
6-1,41

The most of individuals of invertebrates are from Gammarus species. There are also Mayflies and Plecoptera (only larval stages). Besides, there are a lot of species of Trichoptera (larval stages with houses). We've also found three examples of Dendrocoelatum lacteum, which is a flat, free living form of Plathyhelminthes.
The reason for the small variety of invertebrates species is the excessive quantity of ions in the water, its temperature and pH.

temperature-5°C
pH-4,7
ions-ammonium-0,53 [mg/l]
nitrit-0,02
nitrat-- 5
phosphat-0,3
Fe-0,1

We've also marked some species of plants growing near the stream.

III. Summarizing:

The water in Mlynica stream is clean; the grade of cleannes amounts to about I - II.

IV. Plants which grow beside Mlynica streamside

1.Caltha palustris (Sumpfdotter-blume)
2.Filipendula ulmaria (Echtes Mädesüss)
3.Sonchus arvensis (Acker-Gänsediestel)
4.Alchemilla xanthochlora (Gemeiner Frauenmantel)
5.Petasites hybridus (Rote pestwurz)
6.Urtica urens (Kleine Brennessel)
7.Aethusa cynapium sepium (Hundspetersilie)
8.Chrysosplenium alternifolium (Wechselblättriges Milzkrant)
9.Fragaria vesca (Wald-Erdbeere)
10.Potentilla anserina (Gänse-Fingerkrant)
11.Picea abies (Gemeine Fichte)
12.Oxalis acetosella (Wald-Sauerklee)
13.Vaccinium myrtillus (Blaubeere)
14.Hypnum cupressiforme (Zypressenförmiges Schlafmoos)
15.Polytrichum juniperum (Wacholder-Widertonmoos)
16.Equisetum sylvaticum (Wald-Schachtelhalm)

V. Vorkommende Wirbellose

Die Qualität des Wassers kann man durch das vorkommen verschiedener Arten der Wirbellosen bestimmen.
Die Wirbellosen, die wir beobachtet haben, leben im sauberen und fließenden Wasser. Sie sind im Sand oder unter den Steinen versteckt. Die meisten kommen im Larven vor.
Die Indikatoren der I. Klasse sind: Plecoptera, Ameletus und Beatis rhodalis

an der 1. Stelle: 3
an der 2. Stelle: 10
an der 3. Stelle: 22
an der 4. Stelle: 9
an der 5. Stelle: 27


Die Vertreter der Zwischenstufe der I. und II. Klasse heißen: Trichoptera (alle sind im Larvenstadium).

an der 1. Stelle: 6
an der 2. Stelle: 1
an der 3. Stelle: 3
an der 4. Stelle: 2
an der 5. Stelle: 3


Die II. Klasse wird durch Gammarus pulex und Dendrocoelum lacteum repräsentiert. Im Vergleich zu den vorigen befinden sich diese schon in der ausgewachsenen Form.

an der 1. Stelle: 71
an der 2. Stelle: 59
an der 3. Stelle: 72
an der 4. Stelle: 61
an der 5. Stelle: 44


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