Serotiny and the Serotinous Cone

Some tree species delay seed fall because their cones are dependent on a brief blast of heat to release seed. This dependency on heat during the seed production cycle is called serotiny and becomes a heat trigger for seed drop that may take decades to occur. Natural fire has to happen to complete the seed cycle. Although serotiny is primarily caused by fire, there are other seed release triggers that may work in tandem including periodic excess moisture, conditions of increased solar heat, atmospheric drying and parent plant death. Trees that have a serotinous tenancy in North America include some species of conifers including pine, spruce, cypress and sequoia. Serotinous trees in the southern hemisphere include some angiosperms like eucalyptus in fire-prone parts of Australia and South Africa. The Process of Serotiny Most trees drop their seeds during and just after the ripening period. Serotinous trees store their seeds in the canopy via cones or pods and wait for an environmental trigger. This is the process of serotiny. Desert shrubs and succulent plants depend on periodic rainfall for seed drop but the most common trigger for serotinous trees is periodic fire. Natural periodic fires occur globally, and on average, between 50 to 150 years. With naturally occurring periodic lightning fires over millions of years, trees evolved and developed the ability to resist high heat and eventually began using that heat in their reproduction cycle. The adaptation of thick and flame-resistant bark insulated the trees internal cells to direct flame and used the rising indirect heat from fire on cones to drop seed. In serotinous conifers, mature cone scales are naturally sealed shut with resin. Most (but not all) seeds stay in the canopy until the cones are heated to 122-140 degrees Fahrenheit (50 to 60 degrees Celsius). This heat melts the resin adhesive, the cone scales open to expose the seed that then drop or drift after several days to a burned but cool planting bed. These seeds actually do best on the burnt soil available to them. The site provides reduced competition, increased light, warmth and a short term increase of nutrients in the ash. The Canopy Advantage Seed storage in the canopy uses the advantage of height and breeze to distribute seed at the appropriate time onto a good, clear seedbed in satiating quantities enough for seed-eating critters. This masting effect increases the predator seed food supply to overabundance. With this abundance of newly added seed along with adequate germination rates, more seedlings than necessary will grow when moisture and temperature conditions are seasonally average or better. It is interesting to note that there are seeds that drop annually and are not a part of the heat-induced crop. This seed leakage seems to be a natural insurance policy against rare seed failures when conditions are adverse just after a burn and result in a full crop failure. What is Pyriscence? Pyriscence is often a word misused for serotiny. Pyriscence is not as much a heat-induced method for plant seed release, as it is an organisms adaptation to a fire-prone environment. It is the ecology of an environment where natural fires are common and where post-fire conditions offer the best seed germination and seedling survival rates for the adaptive species. A great example of pyriscence can be found in a southeastern United States longleaf pine forest ecosystem. This once large habitat is shrinking in size as fire is more and more excluded as land use patterns have changed. Although Pinus palustris is not a serotinous conifer, it has evolved to survive by producing seedlings that go through a protective grass stage. The initial shoot bursts in a brief bushy growth spurt and just as suddenly stops most top growth. Over the next few years, longleaf develops a significant tap root along with dense needle tufts. A compensating resumption of fast growth returns to the pine sapling around age seven.

The War Of The Cold War - 1804 Words

After WW2 came to an end the world was thrown into a new conflict, the Cold War. This was primarily between the free democratic nations led by the USA and the communist countries led by the USSR, It was a battle between capitalism and communist ideology. An Iron Curtain (As can be seen in the image below) was formed, Winston Churchill labelled this the ‘Iron Curtain’ because of the split in European countries. The split could clearly be seen in east and west Berlin. Germany was split into two countries after their WW2 defeat. Over time, the discrepancy between the two sides was obvious with differences in living standards in West Germany and the living conditions in East Germany. Many tried to avoid communism with the Soviets invading and occupying many European countries such as Poland, Czechoslovakia and Hungary. A lot of people attempted to flee East Germany in the search of a better life in West Germany, but any chances were ceased when a four-metre high and 100km+ long fence was built. Several civilians were mistreated by the leaders of the USSR and without doubt Joseph Stalin was one of those leaders, he sent his own civilians to Gulag camps were most people spent their entire lives working. The capitalist system of government allowed citizens to live a free-flowing life. The capitalist society develops a social hierarchy and allows freedom. An example of the difference in social hierarchy is a rubbish man earning $35000 compared to a doctor earningShow MoreRelatedThe War Of The Cold War1644 Words   |  7 PagesThe Cold War was a state of political and military tension stemming from World War II fought primarily between the United States and the Soviet Union. Although the start and end dates of the Cold War are frequently disputed over, it is generally accepted that the conflict started at the conclusion of the Second World War and stemmed from the social climate and lingering tensions in Europe and the increasing power struggles between the Soviet Union and the United States. Along with economic separationRead MoreThe War Of The Cold War Essay1525 Words   |  7 PagesOne major war ended and another to begin. The Cold war lasted about 45 years. There were no direct m ilitary campaigns between the United States and Soviet Union. However, billions of dollars and millions of lives were lost. The United States emerged as the greatest power from World War 2. (Give Me Liberty 896) The country boasted about having the most powerful navy and air force. The United states accounted for about half of the world’s manufacturing capacity, which it alone created the atomic bombRead MoreThe War Of The Cold War886 Words   |  4 Pagesin an infamous battle against ideologies: The Cold War. Even though war took place during this time, both powers were not involved in battle directly, hence the name cold war. The war mainly consisted of assumed and implied threats of nuclear attacks and political control over states in Europe. Even before 1945, the beginning of the Cold War, tension brewed between the U.S and the U.S.S.R. Both sides had differing views on Europe s state after the war. For instance, programs like the Marshall PlanRead MoreThe War Of The Col d War757 Words   |  4 PagesAs tensions continued to augment profoundly throughout the latter half of the Cold War period, they brought forth a movement from a previous bipolar conflicting course, to one of a more multipolar nature. These tensions were now not only restricted to the Soviet Union and United states, but amongst multiple other nations of the globe. It became a general consensus that a notion of ‘peace’ was sought globally, hence, the emergence of dà ©tente. The nature of this idea in the short term conveyed itselfRead MoreThe War Of The Cold War961 Words   |  4 Pages1945, beginning year of the Cold War. The development of cold war just started after the end of world War ||. The cold war was the result of conflict between two powerful country Soviet Union and United State. The war was regarding to the lead the world after the World War ||. The Soviet Union wanted to emerge its power to the world and so do the United States too. The research paper m ainly focused on various reasons of opposition of two great power of the world Soviets and United States of AmericaRead MoreThe War Of The Cold War1737 Words   |  7 Pages Cold War The Cold War, which is often dated from 1945 to 1989, was a constant state of political and military tension between powers in the West, dominated by the United States with NATO among its allies, and powers in the East, dominated by the Soviet Union along with the Warsaw Pact. The development of Nuclear Weapons and long range shooting missiles by the United States gave a lot of fear and caused mass destruction. The Cold War came about after World War II when America used their atomic bombsRead MoreThe War Of The Cold War1123 Words   |  5 PagesThe Cold War consist of tensions between the Soviets and the U.S. vying for dominance, and expansion throughout the world. Their complete different ideologies and vision of the postwar prevented them from working together. Stalin wants to punish Germany and make them pay outrageous sum of money for reparation. However, Truman has a different plan than Stalin. Truman believes that industrialization and democracy in Germany and throughout th e world would ensure postwar stability. Stalin also wantedRead MoreThe War Of The Cold War942 Words   |  4 PagesFeelings Do Matter At the close of World War Two in 1945, the United States entered another kind of war, the Cold War, which did not involve two adversaries in open battle fields using bullets against the Soviet Union. Throughout the Cold War, incidents fueled feelings of anxiety, mistrust and pride. Often pride is defined as â€Å"a feeling that you are more important or better than other people† (Pride). Mistrust on the other hand is the â€Å"feeling that someone is not honest and cannot be trusted†,Read MoreThe War Of The Cold War1636 Words   |  7 PagesThe U.S. learned greatly after having been declared the victor of the Cold War. Retired four-star U.S. Army general Colin Powell said, â€Å"The long bitter years of the Cold War are over. America and her allies have won; totally, decisively, and overwhelmingly† (Reed 343). The Cold War started after World War II in 1947 and ended in 1991. The U.S. underwent a political war with the Soviet Union in hopes of advancing more rapidly in certain fields, such as nuclear weapons and space crafts. Avoiding nuclearRead MoreThe War Of The Cold War1244 Words   |  5 PagesBoos echoed throughout the streets of Harlem, New York in great waves of disapproval. Hippies holding up signs supporting peace, and posters opposing the Vietnam War, otherwise known as the Cold War, greeted the tired and injured soldiers. The familiarity of their hometown created a sense of peace and warmth, despite the angry cries of protest from the enraged nonconformists. As loved ones embraced their fighters, chants of outrage broke out from the hippies, and the soldiers, relieved to be home

Fundamental Change of American Society Free Essays

The American War for Independence was brought on due to the subconscious aversion to British control. Americans increasingly wanted nothing to do with Great Britain and developed different societal Ideas from them constantly. America was growing as a nation, but to grow even further, they needed liberation from the Crown. We will write a custom essay sample on Fundamental Change of American Society or any similar topic only for you Order Now Patriots took supremacy over all Tories in favor of the Crown and the rest of those remaining impartial. They felt strongly about getting rid of British existence by he time the war had commenced, and in 1779, a newspaper stated, â€Å"Instantly banish every Tory from among you†¦ [And] send them to the Island of Britain† (Doc. B). Because of the war, American society was changed in numerous ways. American fundamentals were altered by the American Revolution in regard to class differences economically, the growing trend of a strong central government politically, and the granting of more freedoms socially. Before the war, America’s economy was controlled by Britain’s mercantilist system; therefore, America was comprised of farmers in the south and merchants in the orth. Without the mercantilist system, disputes arose on whether the new country should be based primarily on agriculture or manufacturing and trade. Those In favor of the Jeffersonian idea believed that farming was, indeed, a very important occupation (Doc. F). Thomas Jefferson, a Democratic-Republican, believed farmers were so virtuous because they were economically independent and were self- sustaining. Because of the new land ordinances, there was plentiful land for farming utilization, too. Alexander Hamilton, a Federalist and first Secretary of the Treasury, n the other hand, believed that imports and exports was the best way to better the economy and develop as a country. He also pressed for a national bank to stabilize and Improve the nation’s credit, whereas Hamilton was strongly opposed as he sought a more stately-governed nation. The post-war economy gave the citizens many hardships, though, and there was serious civil unrest in some areas (Doc. G). The classes differed in America greatly due to the poor economy, making a huge gap between the rich and the poor. Rebellions arose, including the Shays Rebellion, hich took place In Massachusetts from 1786-1787. It occurred because of the financial diffculties the lower-class people were going through, the lack of credit in the new paper money, and harsh policies to decrease the debt. A militia had to be formed instantaneously and the government power eventually won, but It showed that a strong military was needed for the government to be successful and reduce the amount of rebellions. Under the Articles of Confederation, the American government had little success. Federalists and Anti-Federalists existed, where Federalists generally pursued a strong entral government as the Ann-Federalists wanted the opposite. The Articles of Confederation gave a state-supported government, but It wasnt successful In many ways. There were many rebellions arising due to the weak government as a new 1 OF3 nation, so tne Idea 0T a strong central government Degan to arlse . Ine reaerallst papers addressed many aspects of why the Constitution should be ratified. The main ideas included the following: including the fact that a strong government would better defeat the rising up of factions and other rebellions. The Annapolis Convention occurred in 1786 and resulted in a call for a Constitutional Convention. In September of 1787, the Convention took place to revise the Articles of Confederation, but Alexander Hamilton and James Madison schemed to propose a new government all together: the Constitution. James Madison’s main idea resulted in the Virginia Plan with a very powerful, proportionate bicameral legislature, an executive, and a judiciary. After the Constitution, the paper Federalist No. 51 was published in February 1788 and created by Madison to get across to the people the structure of he government planned by the Constitution Convention. The main ideas were: dependency and encroachment to assert that each department should be as independent as possible, the legislature to assert that it is the strongest branch with equally powerful individual branches, usurpations and security to guard from usurpations because it is divided into distinct and separate departments, and factions to end any political uprisings. Basically, the Federalist Papers advocated a means by which checks and balances can be created and a separation of powers. The government had more power than the Articles of Confederation now, but Madison still feared the Constitution gave too limited of federal government power (Doc. l). Since the Constitution was implemented, the Federalists and Ann-Federalists were now disputing about loose and strict interpretations of the document. For example, if a law came about that wasn’t specifically stated in the Constitution that the Federalists wanted, the Anti-Federalists deemed it unconstitutional. The Federalists argued that if a law was not expressly stated against, the law was constitutional. From being a divided, state-governed nation under the Articles of Confederation, to a united nation under the U. S. Constitution, the United States was now under the control of a strong central government and on the road to being one of the most powerful countries in the world. During the American Revolution, many social changes were brought about. In the war, women were taking part in activities that men typically only performed. Deborah Sampson was one of the women that participated in the war to assert her importance as a woman. She disguised as a man in order to serve in the Continental Army. Other women who were said to participate in battles were given the nickname â€Å"Molly Pitcher. The phrase â€Å"Patriot Woman† came into existence, and before the war, both terms were always separated (Doc. A). Daughters of Liberty used their home skills to create a home manufacturing system for all the soldiers to support the war. Molly Wallace stated her claim that since women were allowed to read, then they should be allowed to speak (Doc. J). She wanted for women’s voices to be heard since they were just as educated and active as men in society. Unfortunately, this speech signified that, although women contributed very much in the war, women’s rights were not significantly changed. As far as Native American relations, they were hoping to have peaceful relations with Americans since the King told them to â€Å"take [the Americans] by the hand as friends and brothers† (Doc. C). The Native Americans were not included in the Treaty of Paris of 1783, however, as the United States were making pollcles 0T separate treatles wltnln trlDes. I ne Natlves were quite apprenenslve, ana they stated, â€Å"we thought that [the treaty’s] conclusion would have promoted a friendship between the United States and the Indians† (Doc. E). The whites were moving west now, as the Proclamation Line of 1783 was eliminated (Doc. H). The Northwest Ordinance was declared to let the Americans move westerly as long as they did not bring any slavery into the areas with them. The Indians were in no place mentioned in the laws of the Northwest Ordinance and were again trying to be disregarded by the Americans. On the other hand, the northern slavery opposition started growing even more, which was a huge step in social change for the blacks. They were also accounted for in Congress due to the Three-fifths Compromise allowing the slave population to be represented in the southern states in the House. Religious freedom came about as well during the American Revolution as the Virginia Statutes stated, â€Å"no man shall be compelled to frequent or support any religious worship, place, or ministry whatsoever† (Doc. D). This promoted religious diversity in the United States; thus, encouraging the American Identity. The First Amendment of the Bill of Rights also established freedom of religion, as well as freedom of speech, the right to assemble, and freedom of the press. These new freedoms escalated to the fundamental idea of a free country. The fundamentals of American society were changed by the American Revolution. Economic change in class differences, political change in the strong central government trend, and social change in the spreading idea of freedom. Egalitarianism was an overall change in the society, too, meaning everyone is equal. The main effect of the revolution was a new strong federal government brought about by the Constitution, which gave everyone equal rights. This is a main foundation for the United States of America’s prospering. Without the ideal of equal rights for all, America would be a completely different society all together, without â€Å"life, liberty, or the pursuit of happiness. â€Å" How to cite Fundamental Change of American Society, Papers

Aer Lingus free essay sample

Aer Lingus is the national airline of Ireland. It is headquartered at Dublin Airport, Ireland. †¢The airline operates 43 aircraft and carries on average 10 million passengers per annum. †¢The airlines primary mission is to connect Ireland with the world and the world to Ireland by offering its customers the best product in the Irish airline market at a competitive price. The airline’s primary markets are Ireland, the United Kingdom, Europe and the United States. The Irish people typically undertake several overseas flights a year. This is partly driven by Ireland’s status as an island nation but also reflects the inherent propensity among the Irish to travel to visit overseas destinations. tgp2012 1 Marketing orientation Marketing orientation In 2001 after the 9/11 effect on the airline industry Aer Lingus introduces their first model of low fares to compete with other low fare In 2001 after the 9/11 effect on the airline industry Aer Lingus introduces their first model of low fares to compete with other low fare airlines. We will write a custom essay sample on Aer Lingus or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The airline was close to bankruptcy and they had to find new waysairlines. how to keep the company afloat. They carried out numerous to see The airline was close tosurveys within the industry to find new what was needed/wantedtheorder to prosper. They carried out numerous bankruptcy and they had to identify ways to see how to keep in company afloat. So after the initial surveys they lowered their fares and altered/removed/added new destinations. Since prosper. ompany’s marketing surveys within the industry to identify what was needed/wanted in order to then the So after the initial surveys they loweredupdated/upgraded many times putting the customer in theSince then the company’s marketing orientation has been their fares and altered/removed/added new destinations. driving seat. orientation has been updated/upgraded many times putting the customer in the driving seat. Marketing mix Marketing mix