RECOVERY OF SAUDI ARABIAN SHORE BIOTA FOLLOWING THE GULF WAR

1995 ◽  
Vol 1995 (1) ◽  
pp. 979-979 ◽  
Author(s):  
David A. Jones ◽  
Jaime Plaza ◽  
Iain Watt ◽  
Mahmoud al Sanei
Keyword(s):  
Species Diversity ◽  
Population Density ◽  
Biological Monitoring ◽  
Saudi Arabian ◽  
Gulf War ◽  
Density Fluctuations ◽  
Substrate Type ◽  
Percent Mortality ◽  
The Impact

ABSTRACT Five months after the impact of oil on the shores of Dawhat ad Dafi and Dawhat al Musallamiya, long-term biological monitoring was initiated on permanent transects (PTL) on representative habitats and similar but uncontaminated control habitats outside the area. Upper shore biota was virtually eliminated on all oiled shores, while lower shores showed a 60 to 90 percent mortality, depending on the substrate type. By September 1994, species diversity comparable to that of controls was present on the mid and lower regions of impacted shores. Abundances are still generally lower for most species on affected shores, and abnormal population density fluctuations for some species are still apparent.

scholarly journals Long-term invasion dynamics of Spartina increase vegetation diversity and geomorphological resistance of salt marshes against sea level rise

2020 ◽  
Author(s):  
Dirk Granse ◽  
Sigrid Suchrow ◽  
Kai Jensen
Keyword(s):  
Salt Marsh ◽  
Species Diversity ◽  
Sea Level Rise ◽  
Sea Level ◽  
Salt Marshes ◽  
High Marsh ◽  
Marsh Vegetation ◽  
Vegetation Diversity ◽  
The Impact

AbstractThe cordgrass Spartina anglica C.E. Hubbard (Poaceae) is an invasive transformer in many salt marsh ecosystems worldwide. Relatively little is known about the capacity of Spartina to accelerate salt marsh succession and to protect salt marshes against sea level rise. We analyzed long-term changes in vegetation and elevation in mainland salt marshes of the European Wadden Sea in Schleswig-Holstein, Germany, to estimate the impact of non-native Spartina on the geomorphological resistance of salt marshes to sea level rise and on changes in species diversity. From 1989 to 2019, the Spartina-zone shifted and expanded upwards to elevations of the high marsh zone and Spartina increased in frequency in several salt marsh vegetation communities. At sites where Spartina dominated the vegetation already three decades ago, elevation and species diversity increased with a higher rate compared to sites lacking Spartina. The median change rates reached for elevation MHT +8.6 versus +1.5 mm per year, for species richness +3 versus $$\pm$$ ± 0 species per three decades, and for evenness +0.04 versus −0.08 per three decades, regarding plots with versus without former Spartina dominance, respectively. Invasion of salt marshes by Spartina and its continued, long-term presence were associated with increased elevation and species diversity in the face of sea level rise.

scholarly journals Dominant Species Abundance, Vertical Structure and Plant Diversity Response to Nature Forest Protection in Northeastern China: Conservation Effects and Implications

Forests ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 295 ◽  
Author(s):  
Yuanyuan Wang ◽  
Jinghua Yu ◽  
Lu Xiao ◽  
Zhaoliang Zhong ◽  
Qiong Wang ◽  
...  
Keyword(s):  
Species Diversity ◽  
Forest Structure ◽  
Structural Equation ◽  
Dominant Species ◽  
Tree Density ◽  
Equation Modeling ◽  
Forest Protection ◽  
Natural Reserve ◽  
The Impact

The conservation of species diversity and improvement of forest structure are essential roles of the Natural Reserve Policy and the Natural Forest Protection Program (NFPP) in China. However, the long-term effects of NFPP are still not well-defined, and a natural reserve (Liangshui) and surrounding region were surveyed as a proxy of NFPP for approaching the protection effects. Our results showed that long-term conservation significantly altered the dominant species in the herb layer (80% of species), followed by shrub (58%) and tree layers (50%); there was a 1.6-8.0-fold increase in abundance in Corylus shrubs, Acer trees and Carex grass, but a 1.3–10.0-fold abundance decrease in larch trees, Athyrium herbs and Lonicera shrubs. In contrast, tree species diversity and distribution evenness increased by 31% and 23.4% in the reserve, respectively. Forest protection in the reserve also led to the forest structural alteration with the observation of larger-sized trees and shorter herbs, but relatively sparse forests (smaller tree density). Structural equation modeling manifested that the reserve directly altered forest structure, at a coefficient of 0.854, nearly two-fold higher than its impact on diversity (0.459) and dominant species (−0.445). The most affected parameters were plant size (trees and herbs) and tree density related to forest structure, tree diversity, herb richness and evenness for diversity traits, and Oxalidaceae and Rosaceae for dominant species. This study provides basic data that can be used to evaluate the impact of the nature reserve in NE China, and these findings can be used to guide the implementation of NFPP in the long-term in the future.

Harvesting Natural Resources

2019 ◽  
pp. 104-125
Author(s):  
Emily W. B. Russell Southgate
Keyword(s):  
Land Use ◽  
Species Diversity ◽  
Natural Resources ◽  
Historical Research ◽  
Historical Records ◽  
Hunting And Gathering ◽  
History Of ◽  
History Of Use ◽  
The Impact

People have always had to rely on hunting and gathering for food, fuel and shelter. The first evidence for possible major impact of these activities is the early Holocene extinction of most megafauna on all continents except Africa. Multidisciplinary historical research indicates that both climate and human impact interacted to cause these extinctions. This chapter also discusses historical records which have elucidated some of the long-term impacts of harvesting fish and other creatures of seas and estuaries on aspects such as population numbers, age structure, and species diversity of these organisms. On land, hunting has continued to affect many species. Agriculture, rather than decreasing the use of natural resources, has altered land use and increased demand so that the impact on natural resources has increased worldwide. Industrialization further accelerated this trend. Even those sites removed from active use by inclusion in preserves continue to change, in part because of a complex history of use before they were preserved. Understanding this history can help set appropriate goals for preservation as well as indications of management that may assist in evaluating changes.

scholarly journals Impending conservation crisis for Southeast Asian amphibians

2009 ◽  
Vol 6 (3) ◽  
pp. 336-338 ◽  
Author(s):  
Jodi Rowley ◽  
Rafe Brown ◽  
Raoul Bain ◽  
Mirza Kusrini ◽  
Robert Inger ◽  
...  
Keyword(s):  
Species Diversity ◽  
Population Monitoring ◽  
Southeast Asian ◽  
Conservation Action ◽  
Amphibian Species ◽  
Deforestation Rate ◽  
Ecological Information ◽  
Taxonomic Research ◽  
The Impact

With an understudied amphibian fauna, the highest deforestation rate on the planet and high harvesting pressures, Southeast Asian amphibians are facing a conservation crisis. Owing to the overriding threat of habitat loss, the most critical conservation action required is the identification and strict protection of habitat assessed as having high amphibian species diversity and/or representing distinctive regional amphibian faunas. Long-term population monitoring, enhanced survey efforts, collection of basic biological and ecological information, continued taxonomic research and evaluation of the impact of commercial trade for food, medicine and pets are also needed. Strong involvement of regional stakeholders, students and professionals is essential to accomplish these actions.

scholarly journals Current Status of the Manya River Ecosystem

2014 ◽  
pp. 75-91
Author(s):  
Keyword(s):  
Species Diversity ◽  
Gold Deposits ◽  
Fine Sediment ◽  
Current Status ◽  
Mountain River ◽  
River Ecosystem ◽  
Mining Sites ◽  
Quantitative Characteristics ◽  
The Impact

The article presents the results of studies on the impact of long-term development of placer gold deposits on the ecosystem of the small mountain river in Subpolar Urals (basin of the Ob River) where whitefish species spawn. Significant reduction in species diversity and quantitative characteristics of epiliton and invertabrate communities in the regions located directly below the mining sites have been found. It is shown that an increased intake of fine sediment leads to a violation of the conditions of valuable whitefish species spawn incubation of as a result of siltation of spawning grounds.

Suppressed, but Not Forgotten

2011 ◽  
Vol 70 (1) ◽  
pp. 5-11 ◽  
Author(s):  
Beat Meier ◽  
Anja König ◽  
Samuel Parak ◽  
Katharina Henke
Keyword(s):  
Memory Trace ◽  
Thought Suppression ◽  
Test Phase ◽  
Indirect Test ◽  
Final Test ◽  
Test Experiment ◽  
And Control ◽  
Cue Words ◽  
The Impact

This study investigates the impact of thought suppression over a 1-week interval. In two experiments with 80 university students each, we used the think/no-think paradigm in which participants initially learn a list of word pairs (cue-target associations). Then they were presented with some of the cue words again and should either respond with the target word or avoid thinking about it. In the final test phase, their memory for the initially learned cue-target pairs was tested. In Experiment 1, type of memory test was manipulated (i.e., direct vs. indirect). In Experiment 2, type of no-think instructions was manipulated (i.e., suppress vs. substitute). Overall, our results showed poorer memory for no-think and control items compared to think items across all experiments and conditions. Critically, however, more no-think than control items were remembered after the 1-week interval in the direct, but not in the indirect test (Experiment 1) and with thought suppression, but not thought substitution instructions (Experiment 2). We suggest that during thought suppression a brief reactivation of the learned association may lead to reconsolidation of the memory trace and hence to better retrieval of suppressed than control items in the long term.

Examining the Impact of the Disabled Youth Peer Development Initiative: What are the Long-Term Outcomes?

2003 ◽  
Author(s):  
Teresa Garate-Serafini ◽  
Jose Mendez ◽  
Patty Arriaga ◽  
Larry Labiak ◽  
Carol Reynolds
Keyword(s):  
Long Term Outcomes ◽  
The Disabled ◽  
The Impact
Sign in / Sign up

Export Citation Format

Share Document