The wild camel (Camelus ferus) in China: Current status and conservation implications

2021 ◽  
Vol 60 ◽  
pp. 125979
Author(s):  
Yadong Xue ◽  
Jia Li ◽  
Diqiang Li
Keyword(s):  
Current Status ◽  
Conservation Implications ◽  
Camelus Ferus

scholarly journals Distribution and impact of the alien anemone Sagartia ornata in the West Coast National Park

Koedoe ◽  
2015 ◽  
Vol 57 (1) ◽  
Author(s):  
Tamara B. Robinson ◽  
Cheruscha Swart
Keyword(s):  
West Coast ◽  
National Park ◽  
Diet Analysis ◽  
Current Status ◽  
Rocky Shores ◽  
The West ◽  
Sandy Shore ◽  
Conservation Implications ◽  
Invertebrate Diversity ◽  
Density And Biomass

Sagartia ornata is an alien anemone that occurs intertidally within the West Coast National Park (WCNP). Whilst baseline distributional data was gathered in 2001, the range and abundance of this alien has not been reassessed. The present study aimed to determine the current status and distribution of this anemone, to assess its diet so as to establish the role it may play as predator and to investigate its impact on sandy-shore communities. Sagartia ornata was found to be restricted to the WCNP, where it occurred in densities of up to 508 ± 218 individuals per m2 . Within the park the distribution of this anemone had changed. Populations were recorded in Nanozostera capensis seagrass beds for the first time and this alien was absent from two areas in which it had previously occurred. Diet analysis revealed indigenous polychaetes and amphipods as the dominant prey items consumed by S. ornata. This alien was found to significantly alter sandy-shore community structure, with differences caused primarily by increases in the abundance and biomass of the tanaid Anatanais gracilis and the polychaete Orbinia angrapequensis. Additionally, invaded areas supported significantly greater invertebrate diversity, density and biomass. It is concluded that whilst this anemone negatively affects native biota, its current dependence on restricted habitats precludes widespread impacts with the park.Conservation implications: With regard to conservation implications, this invasion should be routinely monitored outside the WCNP as in its native range S. ornata occurs on rocky shores and kelp holdfasts, suggesting a potential for spread along the west coast of South Africa.

scholarly journals Rocky shores of a major southern African Marine Protected Area are almost free from intertidal invertebrate alien species

Koedoe ◽  
2014 ◽  
Vol 56 (1) ◽  
Author(s):  
Hanlie Malherbe ◽  
Michael Samways
Keyword(s):  
Alien Species ◽  
Protected Area ◽  
Rocky Shore ◽  
Marine Protected Area ◽  
Marine Conservation ◽  
Current Status ◽  
Rocky Shores ◽  
Western Cape ◽  
Conservation Implications ◽  
Marine Alien Species

A major threat to marine ecosystems is the establishment and proliferation of invasive alien species. This study addresses gaps in our knowledge regarding marine alien invertebrate species in the Kogelberg Biosphere Reserve (KBR) and adjacent Betty’s Bay Marine Protected Area (MPA) in the Western Cape of South Africa, together a potentially important area for south-coast marine conservation. Understanding the distribution and geographical expansion of these species is critical for conservation planning. A quantitative systematic survey of the intertidal rocky shore region was undertaken. The mytilid Mediterranean mussel, Mytilus galloprovincialis, and the bryozoan Watersipora subtorquata were the only alien species recorded along the coastline, which included the MPA. The abundance of M. galloprovincialis was significantly higher outside the MPA, and the abundance of W. subtorquata was significantly higher inside the MPA. With only two alien species recorded, the Betty’s Bay MPA and its surroundings support relatively few marine alien species with regards to rocky shore invertebrate biodiversity. Conservation implications: It is important that the Betty’s Bay MPA and its adjacent coastline maintain its current status as an area with relatively few marine alien species. The conservation implications on management require routine surveys of this region to detect early introductions of any additional species.

scholarly journals Current Status of Black-Necked Crane Grus Nigricollis in Southern Xinjiang China: Conservation Implications

2021 ◽  
Author(s):  
Mardan Aghabey Turghan ◽  
Paul Jason Buzzard ◽  
Roller Maming
Keyword(s):  
Arid Environment ◽  
Current Status ◽  
Mountain Ranges ◽  
Conservation Implications ◽  
Grus Nigricollis ◽  
Lop Nur ◽  
The Status ◽  
Surrounding Areas ◽  
Xinjiang Uyghur Autonomous Region ◽  
Southern Xinjiang

Abstract In this paper, we update the status of Black-necked cranes (Grus nigricollis) in Xinjiang Uyghur Autonomous Region, China where it has hardly been recorded. We report on research in Southern Xinjiang，mainly in Altun (Arjin in Chinese) and Kunlun Mountain ranges and their adjacent areas, including part of Pamir Plateau and the southern edge of Lop Nur Basin. Black-necked cranes were observed in seven counties, by direct observation in 2010 to 2017, and we deduced that 180-220 individuals of the species inhabited Kunlun and Altun Mountains and the surrounding areas. 137 cranes, the largest population, were recorded in the autumn migration season in the Altun Mountain Nature Reserve in 2013. The most recent record of Black-necked cranes in the Lop Nur Basin ( N 40°19', E 91°58', alt. 790 m) was observed on May 2010 would be the northernmost distribution location with the lowest latitude and extreme arid environment．

Current status of special planetary and lunar theories and ephemerides

1966 ◽  
Vol 25 ◽  
pp. 266-267
Author(s):  
R. L. Duncombe
Keyword(s):  
Observational Data ◽  
Current Status ◽  
Numerical Errors

An examination of some specialized lunar and planetary ephemerides has revealed inconsistencies in the adopted planetary masses, the presence of non-gravitational terms, and some outright numerical errors. They should be considered of temporary usefulness only, subject to subsequent amendment as required for the interpretation of observational data.

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

Electron-deficient boron-based catalysts for C–H bond functionalisation

2021 ◽  
Author(s):  
Yuanhong Ma ◽  
Shao-Jie Lou ◽  
Zhaomin Hou
Keyword(s):  
Review Article ◽  
Current Status ◽  
Comprehensive Overview

This review article provides a comprehensive overview to recognise the current status of electron-deficient boron-based catalysis in C–H functionalisations.

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