Annexures - WAPCOS - Ministry of Environment and Forests

ANNEXURE-IX
Density of Periphytons at various sampling sites (Unit: No. of individuals/cm 2 )
April 2009
Class Genus Kalai HEP Stage-1 Kalai HEP, Stage-2
Nitzschiaceae
Bacillariophycea
e
Chlorophyceae
Chlorophyceae
Chlorophyceae
Chlorophyceae
Chlorophyceae
S1 S2 S3 S4 S5 S6 S7 S8 S9 S10
Nitzchia
bacata
50 20 30 60 30 10 - - - 20
Cymbella - - - - - - - - 10 10
cistula
Hormidium - - - - - 20 - - 30 -
sp.
Cosmerium - - - - - - 10 - - -
sp.
Spirotaena - - - - 10 - - - 10 10
sp.
Spirogyra 20 70 60 10 50 40 20 30 60 50
varians
Chlorella - - - 10 10 - - - - -
vulgaris
Total 70 90 90 80 100 70 30 30 110 90
Class Genus Hutong HEP, Stage-1 Hutong HEP, Stage-2
S1 S12 S13 S14 S15 S16 S7 S18 S19 S20
1
Nitzschiaceae Nitzchia 50 20 - 10 50 - - - - -
bacata
Bacillariophycea Cymbella 20 - 50 10 0 30 30 70 50 -
e
cistula
Chlorophyceae Hormidium - 10 - 30 20 - 30 - 60 20
sp.
Chlorophyceae Cosmerium - 10 20 - 10 - 20 - - 10
sp.
Chlorophyceae Spirotaena 10 - 20 - 0 10 - 20 - -
sp.
Chlorophyceae Spirogyra 10 70 - 10 20 40 10 20 10 10
varians
Cyanophyceae Gloeocapsa 20 - - - - - - - - 10
sp.
Chlorophyceae Chlorella - - - 20 - 10 10 - - 20
vulgaris
Cyanophyceae Nostoc sp. - - - - - 20 - - - -
Total 11
0
110 90 80 100 110 100 110 120 70
Class Genus Demwe Upper HEP Demwe Lower HEP
S21 S22 S23 S24 S25 S26 S27 S28 S29 S30
Nitzschiaceae Nitzchia 40 - 10 10 20 50 10 70 - 20
bacata
Bacillariophycea Cymbella - 50 40 - 50 - - - - -
e
cistula
Chlorophyceae Hormidium 20 - - 20 40 60 40 10 10 -
sp.
Chlorophyceae Cosmerium - 30 20 - - - - - - -
sp.
Chlorophyceae Spirogyra 30 - 30 10 40 50 30 10 20 50
varians
Chlorophyceae Chlorella 10 - 50 10 - - - - - -
vulgaris
Cyanophyceae Nostoc sp. 20 50 - - - - - 10 - 10
Total 120 130 150 50 150 160 80 100 30 80
50