Table 1
Seasonal distribution, relative abundance and dominance status (Engelmann’s scale, 1978) of phytoplankton species in Baskandi anua.
| Winter | Pre monsoon | Monsoon | Post monsoon | ||||||
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| Class | Name of the species | R.A | D.S | R.A | D.S | R.A | D.S | R.A | D.S |
| (%) | (%) | (%) | (%) | ||||||
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| Chlorophyceae | Spirogyra indica | 62.30 | E | 3.37 | SD | – | – | – | - |
| Scenedesmus sp. | 1.64 | R | – | – | – | – | – | – | |
| Oedogonium sp. | 1.64 | R | – | – | – | – | – | – | |
| Uronema sp. | 4.92 | SD | – | – | – | – | – | – | |
| Zygnema sp. | – | – | 1.12 | R | – | – | – | – | |
| Closteriopsis longissima | – | – | 6.74 | SD | – | – | – | – | |
| Tetraedron trigonum | – | – | 1.12 | R | – | – | – | – | |
| Arthrodesmus sp. | – | – | 1.12 | R | – | – | – | – | |
| Sphaerozosma sp. | – | – | 1.12 | R | – | – | – | – | |
| Hormidium sp. | – | – | 1.12 | R | – | – | – | – | |
| Ulothrix zonata | – | – | 7.87 | SD | – | – | – | – | |
| Closterium sp. | – | – | 2.25 | R | – | – | – | – | |
| Sirocladium sp. | – | – | 4.49 | SD | 3.45 | SD | – | – | |
| Gloeotilopsis sp. | – | – | 4.49 | SD | – | – | – | – | |
| Cladophora sp. | – | – | 2.25 | R | – | – | – | – | |
| Spirotaenia sp. | – | – | 1.12 | R | – | – | – | – | |
| Actinastrum falcatus | – | – | – | – | 5.17 | SD | – | – | |
| Total | 17 | 70.49 | 38.20 | 8.62 | – | ||||
| Chlorophyceae | |||||||||
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| Cyanobacteria | Oscillatoria sp. | 3.28 | SD | – | – | 8.62 | SD | 14.81 | D |
| Microcystis aeruginosa | 3.28 | SD | 16.85 | D | – | – | – | – | |
| Lyngbya sp. | 14.75 | D | 4.49 | SD | 3.45 | SD | 3.70 | SD | |
| Dactylococcopsis sp. | – | – | 1.12 | R | – | – | – | – | |
| Anabaena sp. | – | – | 1.12 | R | 25.86 | D | 25.93 | D | |
| Nostoc commune | – | – | – | 13.79 | D | 22.22 | D | ||
| Merismopedia sp. | 4.92 | SD | 4.49 | SD | – | – | – | – | |
| Synechocystis sp. | – | – | 3.37 | SD | – | – | – | – | |
| Total | 8 | 26.23 | 31.46 | 51.72 | 66.67 | ||||
| Cyanobacteria | |||||||||
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| Bacillariophyceae | Melosira sp. | 1.64 | R | – | – | – | – | – | – |
| Meridion sp. | – | – | 2.25 | R | – | – | – | – | |
| Pinnularia sp. | 1.64 | R | – | – | – | – | – | – | |
| Navicula sp. | – | – | 6.74 | SD | – | – | – | – | |
| Neidium sp. | – | – | – | – | 3.45 | SD | – | - | |
| Mastogloia sp. | – | – | – | – | – | – | 7.41 | SD | |
| Caloneis sp. | – | – | – | – | – | – | 7.41 | SD | |
| Frustulia sp. | – | – | – | – | 3.45 | SD | – | – | |
| Gomphonema sp. | – | – | 2.25 | R | 1.72 | R | – | – | |
| Anomoneis sp. | – | – | – | – | 1.72 | R | – | – | |
| Total | 10 | 3.28 | 11.24 | 10.34 | 14.81 | ||||
| Bacillariophyceae | |||||||||
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| Euglenophyceae | Euglena acus | – | – | 2.25 | R | ||||
| Euglena gracilis | – | – | 13.48 | D | 3.45 | SD | 11.11 | D | |
| Phacus sp. | – | – | 1.12 | R | |||||
| Trachelomonas hispida | – | – | – | – | 8.62 | SD | 7.41 | SD | |
| Trachelomonas volvocina | – | – | – | – | 17.24 | D | – | - | |
| Total | 5 | – | 16.85 | 29.31 | 18.52 | ||||
| Euglenophyceae | |||||||||
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| Dinophyceae | Ceratium hirundinella | – | – | 2.25 | R | – | – | – | – |
| Total Dinophyceae | 1 | – | 2.25 | – | – | ||||
| Total | 41 | 10 | 25 | 13 | 8 | ||||
| phytoplankton taxa | |||||||||
RA- Relative abundance and DS-Dominant status.SR-subrecedent; R-recedent; SD-subdominant; D-dominant and E-eudominant.RA 1% = subrecedent; 1.1–3.1% = recedent; 3.2–10% = subdominant; 10.1–31.6% = dominant and <31.7% = eudominant.
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