Role of nano-biochar in attenuating the allelopathic effect from Imperata cylindrica on rice seedlings

2020 ◽  
Vol 7 (1) ◽  
pp. 116-126 ◽  
Author(s):  
Yu Shen ◽  
Haiyan Tang ◽  
Wenhao Wu ◽  
Heping Shang ◽  
Di Zhang ◽  
...  
Keyword(s):  
Native Species ◽  
Chlorophyll Concentration ◽  
Rice Seedling ◽  
Imperata Cylindrica ◽  
Allelopathic Effect ◽  
Rice Seedlings ◽  
Negative Effects ◽  
Gene Expressions ◽  
Stress Gene

This study applies nano-BC to protect the native species, and reduce the negative effects of rice seedling growth and chlorophyll concentration, as well as oxidative stress, lipid peroxidation and stress gene expressions from invasive species.

scholarly journals Species Home-Making in Ecosystems: Toward Place-Based Ecological Metrics of Belonging

2021 ◽  
Vol 9 ◽  
Author(s):  
Susan Cordell ◽  
Celia Bardwell-Jones ◽  
Rebecca Ostertag ◽  
Amanda Uowolo ◽  
Nicole DiManno
Keyword(s):  
Ecosystem Services ◽  
Species Interactions ◽  
Native Species ◽  
Novel Species ◽  
Management Strategies ◽  
Negative Effects ◽  
Empirical Observation ◽  
Natural Systems ◽  
A Site

Globalization has undeniably impacted the Earth’s ecosystems, but it has also influenced how we think about natural systems. Three fourths of the world’s forests are now altered by human activity, which challenges our concepts of native ecosystems. The dichotomies of pristine vs. disturbed as well as our view of native and non-native species, have blurred; allowing us to acknowledge new paradigms about how humans and nature interact. We now understand that the use of militaristic language to define the perceived role of a plant species is holding us back from the fact that novel systems (new combinations of all species) can often provide valuable ecosystem services (i.e., water, carbon, nutrients, cultural, and recreation) for creatures (including humans). In reality, ecosystems exist in a gradient from native to intensely managed – and “non-nativeness” is not always a sign of a species having negative effects. In fact, there are many contemporary examples of non-native species providing critical habitat for endangered species or preventing erosion in human-disturbed watersheds. For example, of the 8,000–10,000 non-native species introduced to Hawai‘i, less than 10% of these are self-sustaining and 90 of those pose a danger to native biota and are considered invasive. In this paper, we explore the native/non-native binary, the impacts of globalization and the political language of invasion through the lens of conservation biology and sociology with a tropical island perspective. This lens gives us the opportunity to offer a place-based approach toward the use of empirical observation of novel species interactions that may help in evaluating management strategies that support biodiversity and ecosystem services. Finally, we offer a first attempt at conceptualizing a site-specific approach to develop “metrics of belonging” within an ecosystem.

scholarly journals Impact assessment of the introduction of Cichla kelberi in a large Neotropical reservoir and its lateral lagoons (Upper Paraná River Basin, Brazil)

2015 ◽  
Vol 75 (4) ◽  
pp. 1018-1026 ◽  
Author(s):  
M. Ferrareze ◽  
M. G. Nogueira
Keyword(s):  
Native Species ◽  
Continuous Monitoring ◽  
Fish Fauna ◽  
High Rate ◽  
Small Fish ◽  
Negative Effects ◽  
Complex Processes ◽  
Before And After ◽  
Carnivorous Species

Abstract This study aimed to understand how the introduction of Cichla kelberi in Rosana Reservoir (Paranapanema River) affected the native ichthyofauna. Data on the structure of the small fish fauna assemblage were obtained before and after the introduction of this carnivorous species. Samplings were carried out in February and September of 2004, previously to the register of Cichla kelberi in the reservoir, and after its introduction, November of 2004, January, March, May and August of 2005, February and June of 2006, February and July of 2007, February and October of 2008 and February of 2009. A total of 4,693 fish, belonging to 43 different species was sampled between 2004 and 2009. The order Characiformes was the most abundant, followed by Perciformes and Siluriformes. Comparative analyses, before and after the introduction, could not demonstrate significant changes in composition, richness, abundance, biomass, mean length and diversity of fish. Aquatic insects were the main feeding item of C. kelberi, followed by tetragonopterinae fish. Cannibalism was recorded during the whole study period. The results showed that Cichla cannot deeply affect the ichthyofauna assemblages of a large Neotropical reservoir, at least in a short or medium term period after its introduction. The results also allowed concluding that the introduction of C. kelberi in the reservoir is in the phase 3. In this phase, the specie can survive and reproduce in the new environment; however it is not totally established and disseminated. The reasons for the fact that Cichla is still not dominant in Rosana Reservoir could be related to feeding competition, high rate of cannibalism and the presence of large amount of aquatic macrophytes (refuge zones). In spite of the results, the continuous monitoring of the role of non-native species on the local fish fauna is absolutely necessary because the impacts caused by colonization of this undesirable species can be magnified by complex processes, usually correlated with other environmental disturb, especially the negative effects of damming.

Acacia holosericea (Fabaceae) litter has allelopathic and physical effects on mission grass (Cenchrus pedicellatus and C. polystachios) (Poaceae) seedling establishment

2014 ◽  
Vol 62 (3) ◽  
pp. 189 ◽  
Author(s):  
Muhammad S. Quddus ◽  
Sean M. Bellairs ◽  
Penelope A. S. Wurm
Keyword(s):  
Root Growth ◽  
Seedling Growth ◽  
Allelopathic Effect ◽  
Negative Effects ◽  
Litter Cover ◽  
Negative Effect ◽  
Acacia Holosericea ◽  
Aqueous Leaf Extract ◽  
Physical Effects

Invasion of grass weeds is a major threat for ecosystems. Mission grass (Cenchrus pedicellatus and C. polystachios) vigorously competes with native vegetation and has become a serious problem in northern Australian savanna. A lower density of mission grass has been observed under the canopy of stands of native Acacia holosericea. We used a series of laboratory and shade house experiments to assess the potential for allelopathy and the role of litter on germination, emergence and seedling growth of these two species of mission grass. Different concentrations of aqueous leaf extract of A. holosericea were used to assess allelopathic effects on germination. Various depths and types of litter were used to investigate the allelopathic and physical effects of litter on emergence and growth of mission grass seedlings in the shade house. Results indicate that extracts did not affect germination of either species of mission grass but root growth of seedlings was affected. Emergence of seedlings in the shade house was affected by physical litter treatments but not by allelopathy. After emergence no negative effects on seedling growth were detected. Overall we found that there was no allelopathic effect on germination and that the negative effect on emergence was due to the physical properties of the litter. This effect on emergence increased with increasing depth of litter. Allelopathy slightly inhibited root growth but once seedlings emerged, litter tended to facilitate growth. This has implications for the ecological management of mission grass on disturbed lands, using strategies such as manipulation of litter cover through Acacia establishment.

Can trust become a factor of economic growth? Dynamic changes in the level of trust of Russian youth

2020 ◽  
pp. 92-107 ◽  
Author(s):  
A. I. Bakhtigaraeva ◽  
A. A. Stavinskaya
Keyword(s):  
Institutional Environment ◽  
Negative Effects ◽  
Dynamic Changes ◽  
Generalized Trust ◽  
Level Of Education ◽  
Advantages And Disadvantages ◽  
The Future ◽  
Analysis Of Dynamics

The article considers the role of trust in the economy, the mechanisms of its accumulation and the possibility of using it as one of the growth factors in the future. The advantages and disadvantages of measuring the level of generalized trust using two alternative questions — about trusting people in general and trusting strangers — are analyzed. The results of the analysis of dynamics of the level of generalized trust among Russian youth, obtained within the study of the Institute for National Projects in 10 regions of Russia, are presented. It is shown that there are no significant changes in trust in people in general during the study at university. At the same time, the level of trust in strangers falls, which can negatively affect the level of trust in the country as a whole, and as a result have negative effects on the development of the economy in the future. Possible causes of the observed trends and the role of universities are discussed. Also the question about the connection between the level of education and generalized trust in countries with different quality of the institutional environment is raised.

High predatory efficiency and abundance drive expected ecological impacts of a marine invasive fish

2020 ◽  
Vol 637 ◽  
pp. 195-208 ◽  
Author(s):  
EM DeRoy ◽  
R Scott ◽  
NE Hussey ◽  
HJ MacIsaac
Keyword(s):  
Invasive Species ◽  
Native Species ◽  
Ecological Impact ◽  
Marine Species ◽  
Ecological Impacts ◽  
Negative Effects ◽  
Marine Predator ◽  
Eastern Gulf Of Mexico ◽  
Red Grouper ◽  
Per Capita

The ecological impacts of invasive species are highly variable and mediated by many factors, including both habitat and population abundance. Lionfish Pterois volitans are an invasive marine species which have high reported detrimental effects on prey populations, but whose effects relative to native predators are currently unknown for the recently colonized eastern Gulf of Mexico. We used functional response (FR) methodology to assess the ecological impact of lionfish relative to 2 functionally similar native species (red grouper Epinephelus morio and graysby grouper Cephalopholis cruentata) foraging in a heterogeneous environment. We then combined the per capita impact of each species with their field abundance to obtain a Relative Impact Potential (RIP). RIP assesses the broader ecological impact of invasive relative to native predators, the magnitude of which predicts community-level negative effects of invasive species. Lionfish FR and overall consumption rate was intermediate to that of red grouper (higher) and graysby grouper (lower). However, lionfish had the highest capture efficiency of all species, which was invariant of habitat. Much higher field abundance of lionfish resulted in high RIPs relative to both grouper species, demonstrating that the ecological impact of lionfish in this region will be driven mainly by high abundance and high predator efficiency rather than per capita effect. Our comparative study is the first empirical assessment of lionfish per capita impact and RIP in this region and is one of few such studies to quantify the FR of a marine predator.

Endangered Butterflies and their Non-Native Host Plants: Examining Shifting Values of Belonging in Restoration

2019 ◽  
Vol 3 (1) ◽  
pp. 1-9
Author(s):  
Robert M. Anderson ◽  
Amy M. Lambert
Keyword(s):  
Ecological Restoration ◽  
Native Species ◽  
Puget Sound ◽  
A Value ◽  
The Social ◽  
Remote Island ◽  
Scientific Truth ◽  
Native Host

The island marble butterfly (Euchloe ausonides insulanus), thought to be extinct throughout the 20th century until re-discovered on a single remote island in Puget Sound in 1998, has become the focus of a concerted protection effort to prevent its extinction. However, efforts to “restore” island marble habitat conflict with efforts to “restore” the prairie ecosystem where it lives, because of the butterfly’s use of a non-native “weedy” host plant. Through a case study of the island marble project, we examine the practice of ecological restoration as the enactment of particular norms that define which species are understood to belong in the place being restored. We contextualize this case study within ongoing debates over the value of “native” species, indicative of deep-seated uncertainties and anxieties about the role of human intervention to alter or manage landscapes and ecosystems, in the time commonly described as the “Anthropocene.” We interpret the question of “what plants and animals belong in a particular place?” as not a question of scientific truth, but a value-laden construct of environmental management in practice, and we argue for deeper reflexivity on the part of environmental scientists and managers about the social values that inform ecological restoration.

الإمام المصلح عبد الحميد بن باديس: حياته وجهوده التربوية Reformer Imam Abdal-hamid ibn Badis: His Life and Educational Reforms

2015 ◽  
Vol 12 (1) ◽  
pp. 105-152
Author(s):  
باي زكوب عبد العالي ◽  
سوهيرين محمد صوليحين
Keyword(s):  
Twentieth Century ◽  
Educational Reforms ◽  
Daily Routine ◽  
Journalism Education ◽  
Negative Effects ◽  
Educational Approach ◽  
Political Economic ◽  
Difficult Times

الملخّصيعدّ عبد الحميد بن باديس أحد العلماء الجزائريين المبرزين بالإصلاح الاجتماعي والدّيني والسّياسي والتربوي، عاش خمسين سنة في القرن العشرين الميلادي، حيث كانت ولادته سنة 1889م، وكانت وفاته سنة 1940م، ولقد فرض الواقع الجزائري إبّان فترة الاحتلال الفرنسي الذي كان يسعى إلى طمس ثوابت الأمّة الجزائرية، وخرق تاريخها، وهُويّتها، وثقافتها، ووحدتها الدينيّة، واللّغوية على ابن باديس أن يسلك نهج التربية والتعليم، قاصداً بذلك مواجهة الاحتلال الفرنسي الغاشم من خلال عدّة جبهات ومجالات كمثل مجال الصحافة، ومجال التربية والتعليم، ومجال الجمعيات، ومجال السياسة وغير ذلك، يهدف هذا البحث إلى إبراز دور عبد الحميد بن باديس في النّهوض بالأمّة الجزائريّة نحو تربيّة أفضل، وحياة أسعد، فيبدأ أوّلاً وبشكل موجز، بالتعرّف على الفترة الصعبة التي عايشها ابن باديس والمتمثلة في فترة الاحتلال الفرنسي الغاشم، وآثاره السلبية على الصعيد السياسي والاقتصادي والاجتماعي والثقافي والديني الجزائري وقتذاك، ثم يقوم ثانياً بتسليط الضّوء على حياة ابن باديس وتكوينه العلمي ورحلاته الداخلية وأسفاره الخارجية؛ ثم يسعى ثالثاً وبتعمّق، التعرّف على أعمال ابن باديس الاجتماعيّة وجهوده التربويّة التي أخذت حظّاً وافراً من حياته اليومية، والتي تركّزت على منبرين رئيسين، هما: منبر الصّحافة، ومنبر التربيّة والتعليم.الكلمات المفتاحيّة: الإمام عبد الحميد بن باديس، الاحتلال الفرنسي، التربية، الجزائر، الإصلاح.             AbstractImÉm ‘Abd al-×amÊd ibn BÉdÊs is an Algerian scientist, and eminent social, religious, political and educational reformer. He lived fifty years in the twentieth century. He was born in 1889 and died in 1940, and lived during the French occupation that attempted to distort and undermine the foundations of the Algerian nation by destroying its history, identity, culture, and religious and linguistic unity. Ibn BÉdÊs pursued an educational approach to face the brutal French occupation on several fronts, including journalism, education, civil associations, politics, etc. This paper highlights the role of ‘Abd al-×amÊd ibn BÉdÊs in the advancement of the Algerian nation toward better education and a happier life. The paper begins with a brief canvas of the difficult times in which Ibn BÉdÊs lived, and the negative effects of the brutal French occupation from political, economic, social, cultural and religious angles, besides highlighting the life of Ibn BÉdÊs, his education and his local and international travels. The focus of this research is an in-depth examination of Ibn BÉdÊs’ social and educational efforts that consumed much of his daily routine: journalism, and education.Keywords: ImÉm ‘Abd al-×amÊd ibn BÉdÊs, the French Occupation, Education, Algeria, Reform.

scholarly journals Sub-Inhibitory Concentrations of Ciprofloxacin Alone and Combinations with Plant-Derived Compounds against P. aeruginosa Biofilms and Their Effects on the Metabolomic Profile of P. aeruginosa Biofilms

Antibiotics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 414
Author(s):  
Didem Kart ◽  
Tuba Reçber ◽  
Emirhan Nemutlu ◽  
Meral Sagiroglu
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Quorum Sensing ◽  
Inhibitory Concentration ◽  
Molecular Level ◽  
Metabolomic Profile ◽  
Gene Expressions ◽  
New Agents ◽  
Qrt Pcr ◽  
Metabolomic Approach

Introduction: Alternative anti-biofilm agents are needed to combat Pseudomonas aeruginosa infections. The mechanisms behind these new agents also need to be revealed at a molecular level. Materials and methods: The anti-biofilm effects of 10 plant-derived compounds on P. aeruginosa biofilms were investigated using minimum biofilm eradication concentration (MBEC) and virulence assays. The effects of ciprofloxacin and compound combinations on P. aeruginosa in mono and triple biofilms were compared. A metabolomic approach and qRT-PCR were applied to the biofilms treated with ciprofloxacin in combination with baicalein, esculin hydrate, curcumin, and cinnamaldehyde at sub-minimal biofilm inhibitory concentration (MBIC) concentrations to highlight the specific metabolic shifts between the biofilms and to determine the quorum sensing gene expressions, respectively. Results: The combinations of ciprofloxacin with curcumin, baicalein, esculetin, and cinnamaldehyde showed more reduced MBICs than ciprofloxacin alone. The quorum sensing genes were downregulated in the presence of curcumin and cinnamaldehyde, while upregulated in the presence of baicalein and esculin hydrate rather than for ciprofloxacin alone. The combinations exhibited different killing effects on P. aeruginosa in mono and triple biofilms without affecting its virulence. The findings of the decreased metabolite levels related to pyrimidine and lipopolysaccharide synthesis and to down-regulated alginate and lasI expressions strongly indicate the role of multifactorial mechanisms for curcumin-mediated P. aeruginosa growth inhibition. Conclusions: The use of curcumin, baicalein, esculetin, and cinnamaldehyde with ciprofloxacin will help fight against P. aeruginosa biofilms. To the best of our knowledge, this is the first study of its kind to define the effect of plant-based compounds as possible anti-biofilm agents with low MBICs for the treatment of P. aeruginosa biofilms through metabolomic pathways.

scholarly journals Robots as intelligent assistants to face COVID-19 pandemic

2020 ◽  
Author(s):  
Valeria Seidita ◽  
Francesco Lanza ◽  
Arianna Pipitone ◽  
Antonio Chella
Keyword(s):  
Technological Progress ◽  
World Economy ◽  
The State ◽  
Research Groups ◽  
Negative Effects ◽  
The World ◽  
Intelligent Assistants

Abstract Motivation The epidemic at the beginning of this year, due to a new virus in the coronavirus family, is causing many deaths and is bringing the world economy to its knees. Moreover, situations of this kind are historically cyclical. The symptoms and treatment of infected patients are, for better or worse even for new viruses, always the same: more or less severe flu symptoms, isolation and full hygiene. By now man has learned how to manage epidemic situations, but deaths and negative effects continue to occur. What about technology? What effect has the actual technological progress we have achieved? In this review, we wonder about the role of robotics in the fight against COVID. It presents the analysis of scientific articles, industrial initiatives and project calls for applications from March to now highlighting how much robotics was ready to face this situation, what is expected from robots and what remains to do. Results The analysis was made by focusing on what research groups offer as a means of support for therapies and prevention actions. We then reported some remarks on what we think is the state of maturity of robotics in dealing with situations like COVID-19.

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