Floristic tudy of Algae nder he Ice overs in the Alpine Lakes of Arunachal S U T C Pradesh, India (Eastern Himalayas)

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Sudipta Kumar Das
Keyword(s):  
High Altitude ◽  
Key Words ◽  
New Records ◽  
Ice Cover ◽  
Alpine Lakes ◽  
Eastern Himalaya ◽  
Algal Flora ◽  
Arunachal Pradesh ◽  
Eastern Himalayas

<p>Algal flora of five high altitude alpine lakes of Arunachal Pradesh, India (Eastern Himalaya) was documented below the ice cover soon<br />after the winter. A total of 66 taxa were recorded belonging to Class Chlorophyceae (22 taxa of 13 genera), Xanthophyceae (3 taxa of 3<br />genera), Chrysophyceae (1 taxon of 1 genus), Euglenophyceae (3 taxa of 2 genera), Dinophyceae (1 taxon of 1 genus) and<br />Bacillariophyceae (36 taxa of 19 genera). Out of these, 15 taxa were new records from India. Further comparative distributional study was<br />made between the biota near the ice cover and the bottom.<br />Key words: Algae, Ice cover, Lake, Arunachal Pradesh</p><p> </p><p><span>DOI: </span><a id="pub-id::doi" href="http://dx.doi.org/10.21756/cba.v1i1.11021">http://dx.doi.org/10.21756/cba.v1i1.11021</a></p>

Floristic Study of Algae Under The Ice Covers in the Alpine Lakes of ArunachalPradesh, India (Eastern Himalayas)

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Sudipta Kumar Das
Keyword(s):  
High Altitude ◽  
New Records ◽  
Ice Cover ◽  
Alpine Lakes ◽  
Algal Flora ◽  
Arunachal Pradesh ◽  
Eastern Himalayas ◽  
Floristic Study

Algal flora of five high altitude alpine lakes of Arunachal Pradesh, India (Eastern Himalayas) was documented below the ice cover soon after the winter. A total of 66 taxa were recorded belonging to Class Chlorophyceae (22 taxa of 13 genera), Xanthophyceae (3 taxa of 3 genera), Chrysophyceae (1 taxon of 1 genus), Euglenophyceae (3 taxa of 2 genera), Dinophyceae (1 taxon of 1 genus) and Bacillariophyceae (36 taxa of 19 genera). Out of these, 15 taxa were new records from India. Further comparative distributional study was made between the biota near the ice cover and the bottom.

Using bedrock thermochronometer systems to constrain fold-thrust belt geometry and kinematics, insight from the eastern Himalayas, Arunachal Pradesh, India.

2021 ◽  
Author(s):  
Nadine McQuarrie ◽  
Mary Braza
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Hanging Wall ◽  
Vertical Component ◽  
Eastern Himalaya ◽  
Thrust Belt ◽  
Arunachal Pradesh ◽  
Eastern Himalayas ◽  
Cross Section Geometry ◽  
Geometry And Kinematics

&lt;div&gt; &lt;p&gt;One of the first order questions regarding a cross-section representation through a fold-thrust belt (FTB) is usually &amp;#8220;how unique is this geometrical interpretation of the subsurface?&amp;#8221;&amp;#160; The proposed geometry influences perceptions of inherited structures, decollement horizons, and both rheological and kinematic behavior.&amp;#160; Balanced cross sections were developed as a tool to produce more accurate and thus more predictive geological cross sections.&amp;#160; While balanced cross sections provide models of subsurface geometry that can reproduce the mapped surface geology, they are non-unique, opening the possibility that different geometries and kinematics may be able to satisfy the same set of observations. The most non-unique aspects of cross sections are: (1) the geometry of structures that is not seen at the surface, and (2) the sequence of thrust faulting. &amp;#160;We posit that integrating sequentially restored cross sections with thermokinematic models that calculate the resulting subsurface thermal field and predicted cooling ages of rocks at the surface provides a valuable means to assess the viability of proposed geometry and kinematics. &amp;#160;Mineral cooling ages in compressional settings are the outcome of surface uplift and the resulting focused erosion.&amp;#160; As such they are most sensitive to the vertical component of the kinematic field imparted by ramps and surface breaking faults in sequential reconstructions of FTB. &amp;#160;Because balanced cross sections require that the lengths and locations of hanging-wall and footwall ramps match, they provide a template of the ways in which the location and magnitude of ramps in the basal d&amp;#233;collement have evolved with time. &amp;#160;Arunachal Pradesh in the eastern Himalayas is an ideal place to look at the sensitivity of cooling ages to different cross section geometries and kinematic models. Recent studies from this portion of the Himalayan FTB include both a suite of different cross section geometries and a robust bedrock thermochronology dataset. The multiple published cross-sections differ in the details of geometry, implied amounts of shortening, kinematic history, and thus exhumation pathways. Published cooling ages data show older ages (6-10 Ma AFT, 12-14 Ma ZFT) in the frontal portions of the FTB and significantly younger ages (2-5 Ma AFT, 6-8 Ma ZFT) in the hinterland. These ages are best reproduced with kinematic sequence that involves early forward propagation of the FTB from 14-10 Ma.&amp;#160; The early propagation combined with young hinterland cooling ages require several periods of out-of-sequence faulting. Out-of-sequence faults are concentrated in two windows of time (10-8 Ma and 7-5 Ma) that show systematic northward reactivation of faults.&amp;#160; Quantitative integration of cross section geometry, kinematics and cooling ages require notably more complicated kinematic and exhumation pathways than are typically assumed with a simple in-sequence model of cross section deformation.&amp;#160; While also non-unique, the updated cross section geometry and kinematics highlight components of geometry, deformation and exhumation that must be included in any valid cross section model for this portion of the eastern Himalaya.&lt;/p&gt; &lt;/div&gt;

scholarly journals Hydrobiological studies within the tea gardens at Srimangal, Bangladesh. II. Algal flora (excluding Chlorophyceae)

1970 ◽  
Vol 12 (1) ◽  
pp. 33-52
Author(s):  
AKM Nurul Islam ◽  
Haseeb Md Irfanullah
Keyword(s):  
Key Words ◽  
New Records ◽  
Algal Flora ◽  
Plant Taxon

A total of 108 algal taxa belonging to 57 genera and nine classes (excluding Chlorophyceae), namely, Cyanophyceae 28, Euglenophyceae 37, Chloromonadophyceae 1, Charophyceae 3, Xanthophyceae 11, Chrysophyceae 4, Bacillariophyceae 20, Dinophyceae 2 and Rhodophyceae 2 have been recorded from some acidic habitats within the tea gardens at Srimangal, Maulvi Bazar. Of these 13 are new records for Bangladesh. Key words: Acidic habitats; diversity; phytoplankton; periphyton; new records DOI: 10.3329/bjpt.v12i1.609Bangladesh J. Plant Taxon. 12(1): 33-52, 2005 (June)

scholarly journals Contribution to the Algal Flora (Chlorophyceae) of Namchi, Sikkim-Himalayas

Our Nature ◽  
1970 ◽  
Vol 3 (1) ◽  
pp. 50-55 ◽  
Author(s):  
S. Kumar ◽  
S.K. Rai
Keyword(s):  
Key Words ◽  
Fresh Water ◽  
Green Algae ◽  
Rare Species ◽  
New Records ◽  
Algal Flora ◽  
Present Communication

The present communication is a part of survey being conducted to study the fresh water algal flora of Namchi, South Sikkim. Thirteen taxa of class Chlorophyceae, which include 8 genera, 10 species and 3 varieties, were identified from 6 samples. Spirogyra nitida (Dillw.) Link, Netrium digitus (Ehr.) Itzigs. and Roth. and Scenedesmus bijugatus (Turp.) Kuetz. were the dominant green algae followed by the remaining other rare species of Scenedesmus and Staurastrum. All these taxa constitute new records for the study area. Key words: Chlorophyceae, Fresh water algae, India, Namchi, Sikkim-Himalayadoi:10.3126/on.v3i1.334Our Nature (2005) 3: 50-55

scholarly journals Mammals of the high altitudes of western Arunachal Pradesh, eastern Himalaya: an assessment of threats and conservation needs

Oryx ◽  
2006 ◽  
Vol 40 (1) ◽  
pp. 29-35 ◽  
Author(s):  
Charudutt Mishra ◽  
M.D. Madhusudan ◽  
Aparajita Datta
Keyword(s):  
High Altitude ◽  
Indian Subcontinent ◽  
Iucn Red List ◽  
Eastern Himalaya ◽  
Panthera Tigris ◽  
Arunachal Pradesh ◽  
High Altitudes ◽  
Mammal Species ◽  
Cuon Alpinus ◽  
Arunachal Macaque

The high altitudes of Arunachal Pradesh, India, located in the Eastern Himalaya biodiversity hotspot, remain zoologically unexplored and unprotected. We report results of recent mammal surveys in the high altitude habitats of western Arunachal Pradesh. A total of 35 mammal species (including 12 carnivores, 10 ungulates and 5 primates) were recorded, of which 13 are categorized as Endangered or Vulnerable on the IUCN Red List. One species of primate, the Arunachal macaque Macaca munzala, is new to science and the Chinese goral Nemorhaedus caudatus is a new addition to the ungulate fauna of the Indian subcontinent. We documented peoples' dependence on natural resources for grazing and extraction of timber and medicinal plants. The region's mammals are threatened by widespread hunting. The snow leopard Uncia uncia and dhole Cuon alpinus are also persecuted in retaliation for livestock depredation. The tiger Panthera tigris, earlier reported from the lower valleys, is now apparently extinct there, and range reductions over the last two decades are reported for bharal Pseudois nayaur and musk deer Moschus sp.. Based on mammal species richness, extent of high altitude habitat, and levels of anthropogenic disturbance, we identified a potential site for the creation of Arunachal's first high altitude wildlife reserve (815 km2). Community-based efforts that provide incentives for conservation-friendly practices could work in this area, and conservation awareness programmes are required, not just amongst the local communities and schools but for politicians, bureaucrats and the army.

scholarly journals Hydrobiological studies within the tea gardens at Srimangal, Bangladesh. VI. Desmids (Xanthidium, Arthrodesmus, Staurodesmus and Staurastrum)

1970 ◽  
Vol 13 (2) ◽  
pp. 111-129
Author(s):  
AKM Nurul Islam ◽  
Haseeb Md Irfanullah
Keyword(s):  
Land Use ◽  
Species Diversity ◽  
Key Words ◽  
New Records ◽  
Algal Flora ◽  
Aquatic Habitats ◽  
Land Use Pattern ◽  
Monitoring Tools ◽  
Plant Taxon ◽  
Use Pattern

In this last instalment of the series, 78 desmid taxa belonging to four genera, namely Xanthidium (8 taxa), Arthrodesmus (3 taxa), Staurodesmus (11 taxa) and Staurastrum (56 taxa) have been recorded from different aquatic habitats located within the tea gardens at Srimangal, Maulvi Bazar. Of these, nine are described as new records for Bangladesh. An overall assessment of the algal flora of the study area reveals desmids as the single largest group consisting of 230 taxa out of 421 recorded algal taxa. The paper comments on the conservation potentials of the studied aquatic habitats as monitoring tools of land use pattern like tea-gardening. Key words: Acidic habitats, Species diversity, Conservation, Phytoplankton, New records DOI: 10.3329/bjpt.v13i2.583 Bangladesh J. Plant Taxon. 13(2): 111-129, 2006 (December)

scholarly journals First Report on the Ethnopharmacological Uses of Medicinal Plants among Monpa Tribe Living in the Zemithang Region of the Arunachal Pradesh, Eastern Himalayas, India

2016 ◽  
Author(s):  
Tamalika Chakraborty ◽  
Somidh Saha ◽  
Narendra S. Bisht
Keyword(s):  
Medicinal Plants ◽  
Traditional Medicine ◽  
Eastern Himalaya ◽  
Arunachal Pradesh ◽  
Medicinal Uses ◽  
Eastern Himalayas ◽  
Ethnobotanical Uses ◽  
First Time ◽  
The Himalaya ◽  
High Diversity

The Himalaya is well known for high diversity and ethnobotanical uses of medicinal plants. However, not all areas of the Himalayas are well studied. In particular, studies on ethnobotanical uses of plants from the Eastern Himalayas are rare and lacking for many tribes. Past studies primarily focused on listing plants name and their traditional medicinal uses. However, studies on traditional ethnopharmacological practices on medicine preparation had not yet been reported in published literature from the Eastern Himalaya. In this study, we are reporting the first time ethnopharmacological used 24 medicines, their procedures of preparation and listed 53 plant species used for those medicines for Monpa tribe. Such documentations had not yet been done for other tribes in India. Our research demonstrates the urgent need to documents traditional medicine preparation procedures from the local healers before rapid cultural modernization forgets them in transforming country like India. This study should motivate national and international researchers to do more works on ethnopharmacology and bioprospecting.

scholarly journals Phalaenopsis arunachalensis sp. nov. (Orchidaceae: Epidendroideae: Aeridinae) A new epiphytic orchid from Arunachal Pradesh, Northeast India

Lankesteriana ◽  
2020 ◽  
Author(s):  
Khyanjeet Gogoi ◽  
Koj Rinya
Keyword(s):  
New Species ◽  
Key Words ◽  
Germplasm Conservation ◽  
Northeast India ◽  
Eastern Himalaya ◽  
Research Centre ◽  
Arunachal Pradesh ◽  
Epiphytic Orchid ◽  
Evergreen Forests ◽  
Voucher Specimens

A new epiphytic Phalaenopsis is described from tropical evergreen forests of Ziro Valley in Arunachal Pradesh, India, and illustrated with colored photos. It is allied to the similarly colored P. taenialis (Lindl.) Christenson & Pradhan in having non-deciduous leaves, larger perianth segments, the shorter and convex (not flat) lip mid-lobe, and the yellowish-green (not purplish) spur. The new species is morphologically most similar to P. honghenensis from China, but differs most easily by the light pinkish flowers versus bronzy green to brownish flowers of the latter species. A detailed description with corresponding color photos and information on the habitat is provided. The voucher specimens have been deposited at the Herbarium of the Orchid Research Centre Tippi, Arunachal Pradesh, and the Herbarium of The Orchid Society of Eastern Himalaya (TOSEHIM), Regional Orchid Germplasm Conservation and Propagation Centre (Assam Circle), Assam. Key Words: Flora of India, new Phalaenopsis, Phalaenopsis honghenensis, Phalaenopsis subgen. Aphyllae, P. taenialis

scholarly journals Algal flora of Madhabkunda waterfall area in Maulvi Bazar, Bangladesh. III. New records of blue-greens and greens

1970 ◽  
Vol 37 (1) ◽  
pp. 43-48
Author(s):  
Abdul Aziz
Keyword(s):  
Key Words ◽  
Green Algae ◽  
New Records ◽  
Algal Flora ◽  
Blue Green Algae

Examination of samples from Madhabkunda waterfall area at Maulvi Bazar, Bangladesh revealed the presence of Aphanocapsa montana Cramer, Oscillatoria acuiformis Skuja, Oscillatoria redeckii Van Goor, Gloeotrichia natans (Hedwig) Rabenh., Nostochopsis lobatus Wood em Geitler, Schizochlamys gelatinosa A. Br. and Kirchneriella dianae (Bohl.) Coms var. dianae Bohl., Oscillatoria redeckii Van Goor is a new records for this Subcontinent. Aphanocapsa montana Cramer, Oscillatoria acuiformis Skuja, Nostochopsis lobatus Wood em Geitler and Kirchneriella dianae (Bohl.) Coms var. dianae Bohl. are new records for Bangladesh. Key words: Blue-green algae, Cyanobacteria, Green algae, Waterfall, Bangladesh doi:10.3329/bjb.v37i1.1562 Bangladesh J. Bot. 37(1): 43-48, 2008 (June)

Comparison of field data with theories on ice cover progression in large rivers

1984 ◽  
Vol 11 (4) ◽  
pp. 798-814 ◽  
Author(s):  
Bernard Michel
Keyword(s):  
Quantitative Determination ◽  
Key Words ◽  
Field Data ◽  
Ice Cover ◽  
Large Rivers ◽  
Ice Dynamics ◽  
Physical Mechanisms ◽  
Flow Parameters ◽  
Existing Data ◽  
St Lawrence River

There are many theories pertaining to the progression of ice covers in rivers fed by frazil slush and floes but very few have been examined critically by comparing them with field data. In this paper the existing theories on dynamic ice cover progression are reviewed, an additional one is proposed, and they are classified according to the physical mechanisms that are involved. Finally, they are compared with some existing field data for large rivers. The data are extremely scarce and difficult to obtain because of the costs involved and the dangers in traveling over thin ice when the ice cover is being formed.It is usually easier to get only the critical values of parameters giving the limits of ice cover progression. In this paper, complete data were taken from the St. Lawrence River, the Beauharnois Canal, and the La Grande Rivière where the ice thicknesses along with the flow parameters have been measured.In these cases the existing data are adequate, so they could be grouped to explain the various mechanisms involved and to obtain numerical values for their quantitative determination. Key words: glaciology, river ice, ice dynamics, fluvial processes, ice hydraulics.

Sign in / Sign up

Export Citation Format

Share Document