Tvs harish

Environmental Stresess

Environmental stress refers to physical, chemical, and biological constraints on the productivity of species and on the development of ecosystems. When the exposure to environmental stressors increases or decreases in intensity, ecological responses result. Stressors can be natural environmental factors, or they may result from the activities of humans. Some environmental stressors exert a relatively local influence, while others are regional or global in their scope. Stressors are challenges to the integrity of ecosystems and to the quality of the environment.

Species and ecosystems have some capacity to tolerate changes in the intensity of environmental stressors. This is known as resistance, but there are limits to this attribute, which represent thresholds of tolerance. When these thresholds are exceeded by further increases in the intensity of environmental stress, substantial ecological changes are caused.

Environmental stressors can be grouped into the following categories:

Physical stress refers to brief but intense exposures to kinetic energy. This is a type of ecological disturbance because of its acute, episodic nature. Examples include volcanic eruptions, windstorms, and explosions. Wildfire is also a disturbance, during which much of the biomass of an ecosystem is combusted, and the dominant species may be killed. Pollution occurs when chemicals are present in concentrations large enough to affect organisms and thereby cause ecological changes. Toxic pollution can be caused by gases such as sulfur dioxide and ozone, by elements such as arsenic, lead, and mercury, and by pesticides such as DDT. Inputs of nutrients such as phosphate and nitrate can influence productivity and other ecological processes, causing a type of pollution known as eutrophication. Thermal stress occurs when releases of heat influence ecosystems, as happens in the vicinity of natural hot-water vents on the ocean floor, and near industrial discharges of heated water. Radiation stress is associated with excessive loads of ionizing energy. This can occur on mountain tops where there are intense exposures to ultraviolet radiation, and in places where there are exposures to radioactive materials. Climatic stress is associated with excessive or insufficient regimes of temperature, moisture, solar radiation, and combinations of these. Tundra and deserts are examples of climatically stressed ecosystems, while tropical rainforests occur under a relatively benign climatic regime. Biological stresses are associated with the diverse interactions that occur among organisms of the same or different species. Biological stresses can result from competition, herbivory, predation, parasitism, and disease. The harvesting and management of species and ecosystems by humans is a type of biological stress. The introduction of invasive, non-native species may be regarded as a type of biological pollution. Various types of ecological responses occur when the intensity of environmental stress causes significant changes. For example, disruption of an ecosystem by an intense disturbance causes mortality of organisms and other ecological damage, followed by recovery through succession.

More permanent ecological adjustments occur in response to longer-term increases in the intensity of environmental stress, associated perhaps with chronic pollution or climate change. The resulting effects can include reductions in the abundance of vulnerable species, their elimination from sites stressed over the longer term, and replacement by species that are more tolerant of the changed environmental conditions. Other commonly observed responses to longer-term increases in stress include a simplification of species richness and decreased rates of productivity, decomposition, and nutrient cycling. In total, these changes represent a longer-term change in the character of the ecosystem, or an ecological conversion. Tvs harish (talk) 16:19, 17 May 2017 (UTC)

Your submission at Articles for creation: Monna Dreams (May 21)

Your recent article submission to Articles for Creation has been reviewed! Unfortunately, it has not been accepted at this time. The reason left by TheSandDoctor was: Please check the submission for any additional comments left by the reviewer. You are encouraged to edit the submission to address the issues raised and resubmit when they have been resolved.

• If you would like to continue working on the submission, go to Draft:Monna Dreams and click on the "Edit" tab at the top of the window.
• If you need any assistance, you can ask for help at the Articles for creation help desk or on the reviewer's talk page.
• You can also use Wikipedia's real-time chat help from experienced editors.

TheSandDoctor (talk) 08:06, 21 May 2017 (UTC)

Hello! Tvs harish, I noticed your article was declined at Articles for Creation, and that can be disappointing. If you are wondering why your article submission was declined, please post a question at the Articles for creation help desk. If you have any other questions about your editing experience, we'd love to help you at the Teahouse, a friendly space on Wikipedia where experienced editors lend a hand to help new editors like yourself! See you there! TheSandDoctor (talk) 08:06, 21 May 2017 (UTC)

Proposed deletion of James Erskine (director)

The article James Erskine (director) has been proposed for deletion because it appears to have no references. Under Wikipedia policy, this biography of a living person will be deleted after seven days unless it has at least one reference to a reliable source that directly supports material in the article.

If you created the article, please don't be offended. Instead, consider improving the article. For help on inserting references, see Referencing for beginners, or ask at the help desk. Once you have provided at least one reliable source, you may remove the {{prod blp/dated}} tag. Please do not remove the tag unless the article is sourced. If you cannot provide such a source within seven days, the article may be deleted, but you can request that it be undeleted when you are ready to add one. Melcous (talk) 12:57, 27 May 2017 (UTC)

Draft:Monna Dreams concern

Hi there, I'm HasteurBot. I just wanted to let you know that Draft:Monna Dreams, a page you created, has not been edited in 5 months. The Articles for Creation space is not an indefinite storage location for content that is not appropriate for articlespace.

If your submission is not edited soon, it could be nominated for deletion. If you would like to attempt to save it, you will need to improve it.

You may request Userfication of the content if it meets requirements.

If the deletion has already occured, instructions on how you may be able to retrieve it are available at WP:REFUND/G13.

Thank you for your attention. HasteurBot (talk) 01:37, 22 October 2017 (UTC)

Your draft article, Draft:Monna Dreams

Hello, Tvs harish. It has been over six months since you last edited the Articles for Creation submission or Draft page you started, "Monna Dreams".

In accordance with our policy that Wikipedia is not for the indefinite hosting of material deemed unsuitable for the encyclopedia mainspace, the draft has been nominated for deletion. If you plan on working on it further, or editing it to address the issues raised if it was declined, simply and remove the {{db-afc}}, {{db-draft}}, or {{db-g13}} code.

If your submission has already been deleted by the time you get there, and you wish to retrieve it, you can request its undeletion by following the instructions at this link. An administrator will, in most cases, restore the submission so you can continue to work on it.

Thanks for your submission to Wikipedia, and happy editing. TKK! bark with me! 03:16, 9 December 2017 (UTC)