Scrutiny of Genetic System of Artemisia scoparia Waldst & Kit., a Functionally Monoecious Perennial with Wide Distribution in the North West Himalayas, J&K, India

2021 ◽  
Vol 37 (1) ◽  
pp. 41-50
Author(s):  
Uma Bharti ◽  
◽  
Eshan Sharma ◽  
Indu Sharma ◽  
Namrata Sharma ◽  
...  
2012 ◽  
Vol 81 (4) ◽  
pp. 347-363 ◽  
Author(s):  
Malkiat S. Saini ◽  
Rifat H. Raina ◽  
Zakir H. Khan

ABSTRACT Bombus rufofasciatus SMITH is a Tibetan species, widely distributed in the Oriental region. It is a medium tongued species abundant in both the north-east and north-west Indian Himalaya, covering an altitude range from 2400 to 4200 m. Because of its abundance and very wide distribution, it is associated with a sizeable number of host plants. Males and workers are similar in colour pattern, but the queen is a little different. The species shows a preference for highaltitude mountain slopes and is found in abundance in the open meadows of Affarwatt, Sheeshnag, Daksum, the Razdan Pass and the Lahul-spiti Valley of Himachal Pradesh in the north-western Himalaya. For preference it forages on Aconitum spp. (Ranunculaceae), Trifolium spp. (Papilionaceae), Cirsium spp. (Asteraceae) and certain members of Lamiaceae. Due emphasis has been laid on its detailed taxonomic descriptions, synonymy, host plants, pollination ecology, distribution pattern and illustrations. 51 food plants of this species have been recorded for the first time from the areas under study.


Author(s):  
Т.В. Гиоргобиани ◽  
Д.П. Закарая

В результате многолетнего детального изучения выявлены закономерности внутреннего строения альпийской складчатой структуры СевероЗападного Кавказа. Установлено, что одной из характерных особенностей этого региона является латеральная зональность его складчатой структуры в поперечном сечении, выразившаяся в последовательной смене с югозапада на северовосток интенсивной складчатости умеренной, а затем слабой. Это свидетельствует о спаде деформационных усилий в указанном направлении в процессе образования складчатости СевероЗападного Кавказа. Выявлено широкое развитие в пределах южного склона СевероЗападного Кавказа интерференционных складчатых структур, возникающих в результате наложения деформаций разного плана и возраста. Выяснено, что интерференционная складчатость в регионе образована в процессе повторной деформации ранее возникшей линейной складчатости северозападного простирания, тангенциальным долготным сжатием. Установлено, что интерференционная складчатость отражает изменение плана деформации СевероЗападного Кавказа от северовосточного на субмеридиональное во время образования складчатой системы. Рассмотрены кинематические особенности образования складчатости различной морфологии, развитой в пределах изученного региона. Выявлены причины разнообразия складчатых форм, наблюдаемых в современной структуре СевероЗападного Кавказа. Установлено широкое развитие в регионе многочисленных разнообразных по ориентировке, возрасту и кинематике разрывных нарушений. На основании проведенного детального анализа складчатой структуры СевероЗападного Кавказа реконструированы условия ее образования. Выяснено, что в деформировании складчатой структуры СевероЗападного Кавказа выделяются два этапа тектогенеза. На первом этапе деформации (юрасредний миоцен) ведущая роль в складкообразовании принадлежит югозападным тангенциальным силам, возникающих в результате придвигания и прижатия ЧерноморскоЗакавказкого микроконтинента к СевероЗападному Кавказу. Поэтому такую деформацию можно рассматривать как проявление микроплитовой тектоники. На втором этапе тектогенеза (поздний миоценантропоген) в обстановке субмеридионального горизонтального сжатия отдельные блокишоли микроконтинента продвигаясь на север, вторгались в складчатую систему СевероЗападного Кавказа, обусловливая ее повторную дислокацию. Показано, что действие шолевой тектоники привело к преобразованию первичной складчатости в южном активном крае СевероЗападного Кавказа. Новейший процесс деформации с образованием наложенных на первичную складчатость структур продолжается в регионе и в настоящее время. As a result of many years of detailed study, regularities of the internal structure of the Alpine folded structure of the NorthWest Caucasus are revealed. It has been established that one of the characteristic features of this region is the lateral zonality of its folded structure in cross section, which manifests a successive change of intense folding to moderate and then to weak from the southwest to the northeast. This indicates a decrease in deformation strain in the indicated direction during the formation of folding in the NorthWest Caucasus. Widespread development of interference folded structures arising as a result of superimposed deformations of different orientation and age was revealed within the southern slope of the NorthWest Caucasus. It was found that the interference folding in the region is formed in the process of repeated deformation of the linear folding of the northwestern strike formed earlier by the tangential longitudinal compression. It was determined that interference folding reflects a change of the plan of deformation of the NorthWest Caucasus from the northeast to submeridional during the formation of the folded system. The kinematic features of folding formation of various morphology developed within the studied region are considered. The reason of the variety of folded forms observed in the modern structure of the NorthWest Caucasus is revealed. Wide distribution of faults with different orientation, age and kinematics in the region is outlined. The conditions of formation of the folded structure of the NorthWest Caucasus are reconstructed on the basis of a detailed analyses. Its clarified that two stages of tectogenesis were distinguished in the forming of folded structure of NW Caucasus. At the first stage of deformation (JurassicMiddle Miocene) the leading role had the tangential forces SW direction arised as a result of movement and pressing of the Black SeaTranscaucasian Microcontinent to the NW Caucasus. Therefore, such a deformation can be considered as a manifestation of microplate tectonics. During the second stage (Late MioceneAnthropogen) of tectogenesis at the conditions of submeridional horizontal compression, traveling to the north individual blocks of the microcontinent intruded into the folded system of the region, causing its secondary dislocation. It is shown that the activities of schole tectonics led to the transformation of primary folding in the southern active region of the NorthWest Caucasus. The recent processes of deformation with the formation of new superimposed structures is continues in the region at present.


Zootaxa ◽  
2012 ◽  
Vol 3320 (1) ◽  
pp. 1 ◽  
Author(s):  
TADASHI AKIYAMA ◽  
SARAH GERKEN

The distribution of the cumacean family Pseudocumatidae is restricted to the North Atlantic, Mediterranean and brackishwaters of the Pont-Caspian region, except for three known species of the genus Petalosarsia. The present study describes ninespecies of Petalosarsia from Japanese waters, the Sulu Sea, the North-west Pacific, the Indo-West Pacific, and the Tasman Sea,Australia. The occurrence of P. declivis (Sars, 1865) in northern Hokkaido agrees with the reported circumpolar distribution ofthis species. Four species from the Pacific coast of southern Japan and the East China Sea, P. brevirostris Gamô 1986, P. ovalissp. nov., P. ryukyuensis sp. nov. and P. gamoi sp. nov., are characterized by prominent dorsolateral carinae with teeth anteriorlyand the basis of the 2nd maxilliped with a semicircular plate on the ventral surface. Nine specimens collected from the Sulu Seaincluded five species, P. brevirostris, P. gamoi, P. jonesi sp. nov. P. suluensis sp. nov. and P. longicauda sp. nov. The latterthree species were characterized by no or faint dorsolateral carinae on the carapace. Among them, P. jonesi was similar to P.longirostris from the eastern tropical deep Atlantic. Petalosarsia australis sp. nov. from the Tasman Sea is characterized by onefaint pair of dorsolateral carinae running for the entire length of the carapace. The species richness of Petalosarsia in the SuluSea and the Indo-West Pacific suggests a wide distribution of ancestors of Pseudocumatidae around the ancient Tethys Sea, with the Ponto-Caspian region located near the center. The habitat of Petalosarsia was mostly deeper than 200 m.


Author(s):  
Daryl A. Cornish ◽  
George L. Smit

Oreochromis mossambicus is currently receiving much attention as a candidater species for aquaculture programs within Southern Africa. This has stimulated interest in its breeding cycle as well as the morphological characteristics of the gonads. Limited information is available on SEM and TEM observations of the male gonads. It is known that the testis of O. mossambicus is a paired, intra-abdominal structure of the lobular type, although further details of its characteristics are not known. Current investigations have shown that spermatids reach full maturity some two months after the female becomes gravid. Throughout the year, the testes contain spermatids at various stages of development although spermiogenesis appears to be maximal during November when spawning occurs. This paper describes the morphological and ultrastructural characteristics of the testes and spermatids.Specimens of this fish were collected at Syferkuil Dam, 8 km north- west of the University of the North over a twelve month period, sacrificed and the testes excised.


2014 ◽  
Author(s):  
Roald Amundsen ◽  
Godfred Hansen
Keyword(s):  

2003 ◽  
pp. 136-146
Author(s):  
K. Liuhto

Statistical data on reserves, production and exports of Russian oil are provided in the article. The author pays special attention to the expansion of opportunities of sea oil transportation by construction of new oil terminals in the North-West of the country and first of all the largest terminal in Murmansk. In his opinion, one of the main problems in this sphere is prevention of ecological accidents in the process of oil transportation through the Baltic sea ports.


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