Can colpus membrane ornamentation be a reliable taxonomic tool? A case study with some rubiaceous taxa from eastern Himalaya

Palynology ◽  
2022 ◽  
Author(s):  
Shreyasi Basak ◽  
Baishakhi Sarkar ◽  
Dulal Chandra Patra ◽  
Sudhansu Sekhar Dash ◽  
Debabrata Maity ◽  
...  
Keyword(s):  
2021 ◽  
Vol 109 ◽  
pp. 105643
Author(s):  
Nakul Chettri ◽  
Kamal Aryal ◽  
Sanjan Thapa ◽  
Kabir Uddin ◽  
Pratikshya Kandel ◽  
...  

2021 ◽  
Author(s):  
Eleni Wood ◽  
Clare Warren ◽  
Nick Roberts ◽  
Tom Argles ◽  
Barbara Kunz ◽  
...  

During continental collision, crustal rocks are buried, deformed, transformed and exhumed. The rates, timescales and tectonic implications of these processes are determined by linking geochemical, geochronological and microstructural data from metamorphic rock-forming and accessory minerals. Exposures of lower orogenic crust provide important insights into orogenic evolution, but are rare in young continental collision belts such as the Himalaya. In NW Bhutan, eastern Himalaya, a high-grade metamorphic terrane provides a rare glimpse into the evolution and exhumation of the deep eastern Himalayan crust and a detailed case study for deciphering the rates and timescales of deep-crustal processes in orogenic settings. We have collected U-Pb isotope and trace element data from allanite, zircon and garnet from metabasite boudins exposed in the Masang Kang valley in NW Bhutan. Our observations and data suggest that allanite cores record growth under eclogite facies conditions (>17 kbar ~650°C) at ca. 19 Ma, zircon inner rims and garnet cores record growth during decompression under eclogite facies conditions at ca 17-15.5. Ma, and symplectitic allanite rims, garnet rims and zircon outer rims record growth under granulite facies conditions at ~9-6 kbar; >750°C at ca. 15-14.5 Ma. Allanite is generally considered unstable under granulite-facies conditions and we think that this is the first recorded example of such preservation, likely facilitated by rapid exhumation. Our new observations and petrochronological data show that the transition from eclogite to granulite facies conditions occurred within 4-5 Ma in the Eastern Himalaya. Our data indicate that the exhumation of lower crustal rocks across the Himalaya was diachronous and may have been facilitated by different tectonic mechanisms.


Author(s):  
Niranjan Das ◽  
Sujata Deori

Tourism is currently the world’s largest industry (US$ 3.4 trillion annually) and ecotourism represents the fastest growing sector of this market. The term ‘Ecotourism’ was first coined by “Hector Ceballos Lascurain” in 1983, and was initially used to describe nature-based travel to relatively undisturbed area with an emphasis on education. Assam, comprising Eastern Himalaya is one of the Mega bio-diversity hot spots of the world (MYERS, 1991). It also forms part of two endemic bird areas, viz Eastern Himalaya and Assam plains (COLLAR et al., 1994). Nameri National Park is a part of NBL (North Bank Landscape) and also is a part of Eastern Himalayan Mega Biodiversity Hotspot has immense potentialities for the ecotourism venture. The present research can provide an assessment of potential sites within the park, which can speed up tourism infrastructural development. Through the paper the author tries to highlight such possibilities on the basis of assessment of potentials Ecotourism resources of the Nameri National Park through field experience gained different parts of the study area.


2015 ◽  
Vol 46 ◽  
pp. 46-51 ◽  
Author(s):  
Rupankar Bhagawati ◽  
Kaushik Bhagawati ◽  
Vijay Kumar Choudhary ◽  
Deep Jyoti Rajkhowa ◽  
Rupjyoti Sharma

Current study was undertaken to highlight the effect of pruning on improving vigor of old orchards and increasing performance in terms of fruit yield and quality under water and nutrient stressed condition of mid hills of Eastern Himalaya. Guava was taken for the case study and all the physical and chemical properties of the fruits and other attributes of plant were evaluated using standard methods under three pruning intensities (light, moderate and severe) and no pruning. The emergence of bud was earliest in severe pruning, number of buds per shoot was highest with light pruning and cumulative lengths of new shoots were found to be highest in severe pruning. Fruit yield, size and weight were found to increase with pruning intensities and lowest in case of no pruning. Regarding chemical properties, total soluble solids and total sugar found to increase with enhanced pruning severity and least in case of no pruning. Acidity was found to be highest with no pruning and decrease with increase in pruning intensities. Overall pruning found to have rejuvenating impact on aged trees due to better light interception leading to better photosynthetic rate, better nutrient and water supply with reduced canopy and better quality yields.


2020 ◽  
Vol 5 (1) ◽  
pp. 74-98
Author(s):  
Deepa Joshi ◽  
Joas Platteeuw ◽  
Juliana Teoh

Criticism and contestation of large dam projects have a long, strong history in India. In this paper, we analyze diverse civil-society responses to large dam projects in the Eastern Himalaya region of India, which has in the past decades been presented as a clean, green, climate-mitigating way of generating energy, but critiqued for its adverse impacts more recently. We draw our findings primarily based on interviews with NGOs involved in environmental and/or water issues in Darjeeling, interviews with those involved in a local people’s movement ‘Affected Citizens of Teesta’, and participatory research over the course of three years between 2015 and 2018. Our findings show how doing development for the state, the market and/or donor organizations compromises the ability of NGOs in the Darjeeling region to hold these actors accountable for social and environmental excesses. In the same region, dam projects in North Sikkim led to a local people’s movement, where expressions of indigeneity, identity and place were used to critique and contest the State’s agenda of development, in ways that were symptomatically different to NGOs tied down by relations of developmental bureaucracy. Our findings reveal how the incursion of State authority, presence and power in civil-society undermines the civil society mandate of transformative social change, and additionally, how the geographical, political, institutional and identity-based divides that fragment diverse civil-society institutions and actors make it challenging to counter the increasingly consensual politics of environmental governance.


Author(s):  
Sujata Deori ◽  
Niranjan Das

Ecotourism in simple words means management of tourism and conservation of nature in a way so as to maintain a fine balance between the requirements of tourism and ecology on one hand. Well-planned Ecotourism can benefit both protected areas and residents of surrounding communities by linking long term Bio-diversity conservation with local social and economic development. Assam in fact is a global Bio-diversity hot spot (Myers, 1988; 1991) and has a rich cultural Heritage. It also forms part of two endemic bird areas, viz.-Eastern Himalaya and Assam plain. (Coller, 1994). Assam plain comprises a good number of Wetlands (Beels) in the Brahmaputra valley abounds in bio-diversity and productivity. These wetlands maintain ecosystem diversity, as they are the natural storehouse of valuable flora and fauna of an area. Besides these, they are also used for various economic purposes by the people living in and around it through ecotourism activities like bird watching, angling, boating etc. The wetlands are of great value for both man and environment for long term financial sustainability by the surrounding communities as well as conservation of nature. Through the paper the author tries to highlight such possibilities on the basis of assessment of potential ecotourism resources of the Deepor Beel (Wetland) of Guwahati through field experience gained in the area.


2014 ◽  
Vol 38 (01) ◽  
pp. 102-129
Author(s):  
ALBERTO MARTÍN ÁLVAREZ ◽  
EUDALD CORTINA ORERO

AbstractUsing interviews with former militants and previously unpublished documents, this article traces the genesis and internal dynamics of the Ejército Revolucionario del Pueblo (People's Revolutionary Army, ERP) in El Salvador during the early years of its existence (1970–6). This period was marked by the inability of the ERP to maintain internal coherence or any consensus on revolutionary strategy, which led to a series of splits and internal fights over control of the organisation. The evidence marshalled in this case study sheds new light on the origins of the armed Salvadorean Left and thus contributes to a wider understanding of the processes of formation and internal dynamics of armed left-wing groups that emerged from the 1960s onwards in Latin America.


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