Abstract
Loktak Lake, characterized by floating vegetation ‘phumdi,’ is the only natural habitat of endangered Sangai. The lake ecosystem is stressed by anthropogenic influences including commissioning of Ithai Barrage. Thus, a bio-assessment of ecosystem health was carried out using diatoms as indicator. The diatom samples were collected, integrated, processed, and mounted in Naphrax. Species count was made for 500 valves. Flora consisted of 114 diatom taxa. Species diversity and evenness are high. Van Dam ecologic categories depicted by 1–7 values, for pH, salinity, N2 uptake, O2 requirements, saprobity and trophic conditions of the Lake, were computed by OMNIDIA software. All categories (1–7) occurred only for trophic condition but the diatom community was dominated by eutraphentic forms, indicating eutrophication. Probably the barrage prevents flushing of nutrients accumulated from decaying phumdis. Leclercq Index indicates very high degradation, indicating vicious conditions in the lake. Restoration is essential to Loktak Lake.
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Acknowledgements
The first author acknowledges academic institutional support from the Principal, Government P.G. College, Dakpathar, and the co-author is thankful to the Head, Department of Zoology & Biotechnology, H.N.B. Garhwal University, Srinagar, for extending all facilities during the present study.
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Appendix 1
Appendix 1
Diatom flora of Loktak Lake
Pennales | C |
---|---|
Diatoma vulgaris Bory morpho producta Gr. in VH | 4 |
Fragilaria rumpens (Kützing) G.W.F. Carlson | 26 |
Tabellaria fenestrate (Lyngbye) Kützing | 5 |
Ulnaria ulna (Nitzsch) Compère | 1 |
U. u. var. aequalis (Kützing) Aboal | 4 |
U. u. var. acus (Kützing) Abol | 32 |
U. amphirhynchus (Ehrenberg) Compere et Bukhtiyarova | 1 |
U. danica (Kützing) Compere et Bukhtiyarova | 2 |
Achnanthes brevipes Agardh | 1 |
Achnanthidium catenatum (Bily& Mar.) Lange-Bertalot | 14 |
A. exigum (Grunow) var. heterovalvum (Krasske) Czarnecki | 2 |
Achnanthes microcephala (Kützing) Grunow | 1 |
A. minutissimum (Kutzing) Czarnecki | 1 |
Cocconeis euglypta Ehrenberg | 31 |
C. pediculus Ehrenberg | 7 |
C. placentula Ehrenberg | 40 |
Lemnicola hungarica (Gr) Round & Basson | 1 |
Planothidium hauckianum (Gr) Round & Bukhtiyarova | 2 |
P.lanceolatum (Brebisson ex Kutzing) Lange-Bertalot | 2 |
P. rostratum (Öestrup) Round & Bukhtiyarova | 8 |
Rossithidium linearis (W. Smith) Round & Bukhtiyarova | 3 |
Actinella guianensoides Metzeltin & Lange-Bertalot | 1 |
Eunotia alpina (Naegeli) Hustedt | 1 |
E. flexuosa (Brebisson) Kützing | 1 |
E. pectinalis (Dyllwyn) Rabenhorst | 1 |
E. monodon Ehrenberg | 4 |
E. m. var. bidens (Gregory) Hustedt | 1 |
Amphora libyca Ehrenberg | 1 |
A. montana Krasske | 2 |
A. pediculus (Kützing) Grunow | 3 |
A. veneta Kützing | 2 |
Amphipleura pellucida Kützing | 1 |
Anomoeoneis styriaca (Grunow) Hustedt | 1 |
Brachysira vitrea (Grunow) Ross in Hartley | 40 |
Caloneis bacillum (Grunow) Cleve | 1 |
Craticula accomoda (Hustedt) D.G. Mann | 2 |
Craticula cuspidata (Kützing) D.G. Mann | 1 |
Cymbella aspera (Ehrenberg) H. Peragallo | 1 |
C. austriaca Grunow | 1 |
C. excisa Kützing | 10 |
C. gracilis (Ehrenberg) Kützing | 1 |
C. hantzschiana Krammer | 5 |
C. hustedtii Krasske | 13 |
C. h. var. crassipunctata Lange-Bertalot & Krammer | 7 |
C. mesiana Cholnoky | 7 |
C. orientalis Lee in Lee Gotoh & Chung | 1 |
C. perparva Krammer | 1 |
C. parva (W. Smith) Kirchner in Cohn | 1 |
C. pervarians Krammer | 1 |
C. subleptoceros Krammer | 11 |
C. subhelvetica Krammer | 4 |
C. stigmaphora Østrup | 5 |
C. tumida (Brébisson) Van Heurck | 6 |
C. turgidula Grunnow | 1 |
C. t. var. venezolana Krammer | 1 |
Diadesmis confervacea Kützing | 1 |
Diploneis elliptica (Kützing) Cleve | 1 |
D. modica Hustedt | 1 |
Encyonema minutum (Hilse in Rabenhorst) D.G. Mann | 27 |
Epithemia sorex Kützing | 3 |
E. zebra (Ehrenberg) Kützing | 10 |
Frustulia vulgaris (Thwaite) De Toni | 2 |
Gomphonema affine Kützing | 4 |
G. acuminatum Ehrenberg | 18 |
G. neonasutum Lange-Bertalot & Reichardt | 51 |
G. angustum Agardh | 1 |
G. augur Ehrenberg | 6 |
G. clevei Fricke | 7 |
G. gracile Ehrenberg | 2 |
G. olivaceum (Hornemann) Brébisson | 1 |
G. parvulum Kützing | 59 |
G. subtile Ehrenberg | 1 |
G. truncatum Ehrenberg | 1 |
Gyrosigma obtusatum (Sullivan & Wormley) Boyer | 29 |
Hantzschia amphioxys (Ehrenberg) Grunow | 5 |
Luticola goeppertiana (Bleish in Rbenhorst) D.G. Mann | 2 |
Navicula capitatoradiata Germain | 1 |
N. cryptocephala Kützing | 10 |
N. cryptotenella Lange-Bertalot | 9 |
N. krammerae Lange-Bertalot | 1 |
N. upsaliensis (Grunow) Peragallo | 1 |
N. phyllepta Kützing | 20 |
N. radiosa Kützing | 16 |
N. schroeteri Meister | 16 |
N. rostellata Kützing | 3 |
N. veneta Kützing | 1 |
N. v. var. viridula (Kützing) Ehrenberg | 4 |
N. v. var. v. forma linearis (Hustedt) Kobayasi | 1 |
Neidium affine (Ehrenberg) Piftzer | 1 |
N. ampliatum (Ehrenberg) Krammer | 1 |
N. binodeforme Krammer | 1 |
Nitzschia clausii Hantzsch | 23 |
N. dissipata (Kützing) Grunow | 1 |
N. dravellensis Coste & Ricard | 1 |
N. frustulum (Kützing) Grunow | 4 |
N. gracillis Hantzsch | 2 |
N. hantzschiana Rabenhorst | 12 |
N. obtusa var.scalpelliformis Grunow | 1 |
N. palea (Kützing) W. Smith | 20 |
Placoneis elliptica (Hustedt) Ohtsuka | 1 |
Pinnularia acrospheria W. Smith | 1 |
P. braunii (Grunow) Cleve | 1 |
P. subcapitata Gregory | 1 |
Pleurosigma angulatum (Quekett) W. Smith | 4 |
Reimeria sinuata (Gregory) Kociolek & Stoermer | 1 |
Rhopalodia gibba (Ehrenberg) O. Müller | 1 |
Sellaphora mantasoana Metzeltin et Lange-Bertalot | 1 |
S. parapupula Lange-Bertalot | 1 |
S. pupula (Kützing) Mereschkowsky | 1 |
Stauroneis anceps Ehrenberg | 1 |
S. phoenicenteron (Nitzsch) Ehrenberg | 1 |
urirella capronii Brebisson in Kitton | 3 |
S. linearis W. Smith | 1 |
Centrales | |
Cyclotella meneghiniana Kützing | 8 |
Discostella stelligera (Cleve at Grunow) Houk & Klee | 1 |
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Nautiyal, R., Nautiyal, P. (2018). Health Assessment of Loktak Lake Using Diatoms as Biological Indicators. In: Siddiqui, N., Tauseef, S., Bansal, K. (eds) Advances in Health and Environment Safety. Springer Transactions in Civil and Environmental Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7122-5_1
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