Effect of the south westerly monsoon on seasonal development of Echinometra mathaei (de Blainville) at Raaha, Dhofar, Sultanate of Oman

2020 ◽  
pp. 589-594
Author(s):  
A.C. Campbell ◽  
O. Gusman
1995 ◽  
Vol 46 (4) ◽  
pp. 751 ◽  
Author(s):  
AE Drummond

The reproductive cycles of Echinometra mathaei and Diadema savignyi on the South African eastern coast were investigated by means of gonad index and histological methods. Both species showed annual cycles, with spawning occurring during the summer months (December to March-April), but the degree of gametogenic synchrony differed markedly between the two species. In D. savignyi, gametogenesis within and between sexes was in close synchrony and there was evidence suggesting that repeated spawning with a monthly rhythm occurred. In contrast, gametogenesis in E. mathaei was poorly synchronized and spawning occurred over an extended period.


2021 ◽  
Author(s):  
Peter in ‘t Panhuis ◽  
Adel El Sabagh ◽  
Hilde Coppes ◽  
John Meyers ◽  
Niels Van der Werff ◽  
...  

Abstract This article will show how a standardized rule-based approach was used by Petroleum Development Oman (PDO) to shorten the cycle time required to mature the opportunity of implementing waterflood developments in small-to-medium sized satellite oil fields in the South of the Sultanate of Oman. The standardized concept relies on a common development strategy for a portfolio of satellite fields with similar reservoir and fluid characteristics that are still under depletion or in the early stage of waterflood. The targets are early monetization, driving cost efficiency through standardization & replication, and increasing recovery factor through the accelerated implementation of field-wide waterflood. This is achieved by leveraging excess capacity in existing facilities, applying analytical workflows for forecasting, standardizing well design and urban planning, and by applying the learnings and best practices from nearby fields that already have mature developments.


2006 ◽  
Vol 3 (4) ◽  
pp. 14-16 ◽  
Author(s):  
Hamed Al-Sinawi ◽  
Samir Al-Adawi

The Sultanate of Oman is located in the south-east of the Arabian Peninsula. It has a distinctive history and subcultures. Its seafaring tradition has endowed the country with various ethnic and linguistic groups, with Arabic being a dominant language and Ibadhi being the dominant sect of Islam (Al-Nami, 1971). Oman in the 1970s saw rapid development, triggered by the discovery of oil, which took place under enlightened new political leadership.


2017 ◽  
Author(s):  
Hanaa Al-Sulaimani ◽  
Zainab Al-Rawahi ◽  
Conny Velazco Quesada ◽  
Mohammed Al-Ghannami ◽  
Mervin Frumau ◽  
...  

2019 ◽  
Author(s):  
Reham Jabri ◽  
Rifaat Mjeni ◽  
Mohammed Gharbi ◽  
Abdullah Alkindi

2021 ◽  
Vol 69 ◽  
Author(s):  
Т.A. Moskalyuk ◽  

The structure of herbaceous layer in the conditionally-indigenous mixed broad-leaved type of forest with lianas and its change for 1998-2018 are analyzed. Research was carried out at the ecological profile "Gornotayozhniy" (Ussuriysky district, Primorye Territory). A general description of phytocoenoesis is given. Complexes of microgroups of the herbaceous layer, united by the similarity of species composition, life forms and seasonal development, have been identified and characterized. Cartographic schemes of the herbaceous layer with the placement of microgroups at the beginning of research and after 20 years were compiled. It has been established that in the structure of herbaceous layer of forest ecosystems the directions of regular changes caused by the course of the forest-forming process are clearly traced.


2013 ◽  
Vol 39 (1) ◽  
pp. 187-197 ◽  
Author(s):  
Karl Ramseyer ◽  
Joachim E. Amthor ◽  
Albert Matter ◽  
Thomas Pettke ◽  
Martin Wille ◽  
...  
Keyword(s):  

2015 ◽  
Vol 12 (16) ◽  
pp. 13283-13309 ◽  
Author(s):  
G. C. Pitcher ◽  
T. A. Probyn

Abstract. The considerable impact of oxygen deficient waters on marine resources in St Helena Bay has generated interest in exploring the vulnerability of South Africa's largest and most productive bay to further deoxygenation in response to climate change. Seasonal, sub-seasonal and spatial fluctuations in bottom dissolved oxygen (DO) are examined in St Helena Bay to facilitate better interpretation of historical data. DO measurements in relation to physical, chemical and biological variables were made between November 2013 and November 2014. Alongshore bay characteristics were assessed through comparison of variables along the 50 m depth contour. A mean coefficient of variation of 0.35 provided a measure of the relative variability of near-bottom DO concentrations along this contour. Across-shelf transects captured the seasonal development of hypoxia in relation to the distribution of phytoplankton biomass. DO was lowest in autumn in the south of the bay prior to winter ventilation of the bottom waters. Exceptional dinoflagellate blooms forming extensive subsurface thin layers preceded the autumn DO minima. The development of hypoxia at inner and central stations prior to expansion beyond the boundaries of the bay provided evidence of local drawdown. Coincident with the seasonal decline of DO within the bay was an increase in macronutrient concentrations which tended to mirror DO concentrations. Indication of denitrification in the suboxic waters in the south of the bay was provided through evidence of a nitrate deficit in autumn supported by elevated nitrite concentrations. Superimposed on the seasonal decline of DO concentrations in the bottom waters were sub-seasonal events of hypoxia and anoxia linked to episodic deposition of organic matter as indicated by increases in bottom Chl a concentrations.


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