Why Are Amphibians in Decline

In recent years, scientists and conservationists have been working to raise public awareness of a global decline in amphibian populations. Herpetologists first started noting that amphibian populations were falling at many of their study sites in the 1980s; however, those early reports were anecdotal, and many experts doubted that the observed declines were cause for concern (the argument was that populations of amphibians fluctuate over time and the declines could be attributed to natural variation). See also 10 Recently Extinct Amphibians But by 1990, a significant global trend had emerged—one that clearly overstepped normal population fluctuations. Herpetologists and conservationists started voicing their concern about the worldwide fate of frogs, toads and salamanders, and their message was alarming: of the estimated 6,000 or so known species of amphibians that inhabit our planet, nearly 2,000 were listed as endangered, threatened or vulnerable on the IUCN Red List (Global Amphibian Assessment 2007). Amphibians are indicator animals  for environmental health: these vertebrates have delicate skin that readily absorbs toxins from their environment; they have few defenses (aside from poison) and can easily fall prey to non-native predators; and they rely on the proximity of aquatic and terrestrial habitats at various times during their life cycles. The logical conclusion is that if amphibians populations are in decline, it is likely that habitats in which they live are also degrading. There are numerous known factors that contribute to amphibian declines—habitat destruction, pollution, and newly introduced or invasive  species, to name just three. Yet research has revealed that even in pristine habitats—those that lie beyond the reach of bulldozers and crop-dusters—amphibians are disappearing at shocking rates. Scientists are now looking to global, rather than local, phenomena for an explanation of this trend. Climate change, emerging diseases, and increased exposure to ultraviolet radiation (due to ozone depletion) are all additional factors that could be contributing to falling amphibian populations. So the question Why are amphibians in decline? has no simple answer. Instead, amphibians are disappearing thanks to a complex mixture of factors, including: Alien Species.  Native amphibian populations can suffer decline when alien species are introduced into their habitats. An amphibian species may become the prey of the introduced species. Alternatively, the introduced species may compete for the same resources required by the native amphibian. It is also possible for introduced species to form hybrids with native species, and so reduce the prevalence of the native amphibian within the resulting gene pool.Over-Exploitation.  Amphibian populations in some parts of the world are declining  because frogs, toads and salamanders are captured for the pet trade or are harvested for human consumption.Habitat Alteration and Destruction.  Alteration and destruction of habitat has devastating effects on many organisms, and amphibians are no exception. Changes to water drainage, vegetation structure, and habitat composition all impact the ability of amphibians to survive and reproduce. For example, the drainage of wetlands for agricultural use directly reduces the range of habitat available for amphibian  breeding and foraging.Global Changes (Climate, UV-B, and Atmospheric Changes).  Global climate change presents a serious threat to amphibians, because altered precipitation patterns usually result in changes to wetland habitats. Additionally, increases in UV-B radiation due to ozone depletion have been found to severely impact some amphibian species.Infectious Diseases.  Significant amphibian declines have been associated with infectious agents such as the chytrid fungus and iridoviruses. A chytrid fungal infection known as chytridiomycosis was first discovered in populations of amphibians in Australia, but also has been found in Central America and North America.Pesticides and Toxins.  The widespread use of pesticides, herbicides, and other synthetic chemicals and pollutants has severely impacted  amphibian populations. In 2006, scientists at the University of California, Berkeley found that mixtures of p esticides were causing amphibian deformities, reducing reproductive success, harming development of juveniles, and increasing amphibians susceptibility to diseases such as bacterial meningitis. Edited on February 8, 2017 by Bob Strauss

Essay about The Downfall of Macbeth - 1001 Words

Macbeth, written by William Shakespeare, is the tragic tale of Macbeth, a virtuous man, corrupted by power and greed. This tragedy can be classified by one of two theories. One theory suggests that the tragic hero, Macbeth, is led down an unescapable road of doom by an outside force; namely the three witches. The second suggests that there is no supernatural force working against Macbeth, which therefore makes him responsible for his own actions and inevitable downfall. Macbeth is indeed responsible for his own actions which are provoked by Lady Macbeth, the witches, his ambition, and an unwillingness to listen to his own conscience. These forces had no direct control over his actions but simply pointed†¦show more content†¦Macbeth then had to make a decision. He willingly chose to follow the path of death and destruction. Lady Macbeth simply showed him that path. It is easy to believe that the witches controlled Macbeth and made him follow a path of doom. The predictions they give, coupled with their unholy ways suggest that they are in control of him. They are not. It is admittedly strange that the weird sisters first address Macbeth with,All hail, Macbeth! Hail to thee Thane of Cawdor!(I, iii, 49), a title which not even Macbeth is aware he has been awarded. Even stranger is the third witch calling to Macbeth,All hail, Macbeth, that shalt be king hereafter!(I, iii, 50). Here it may seem as if the witches are using their supernatural powers to control Macbeths future. All they have done is foretold his future. A prophecy is hardly an invitation to murder. Banquo hears the witches words and tells Macbeth: The instruments of darkness tell us truths, Win us with honest trifles, to betrays In deepest consequence (I, iii, 124-126) He is telling Macbeth not to be swayed by the witches even though one of the prophecies has come true. It is a warning that Macbeth ignores. He is so enraptured by the prophecies of the witches that he consciously follows a path of darkness in an effort to fulfil theShow MoreRelatedMacbeths Downfall1691 Words   |  7 PagesMacbeths Downfall In the beginning of the play Macbeth, Macbeth is a successful and noble Thane of Glamis. The witches tell Macbeth prophecies that guide him to his downfall, but in the end it was his own selfish decisions that caused his demise. The other person that is blamed for Macbeth’s destruction was his wife Lady Macbeth because she was able to manipulate and control his self-esteem by playing with his courage and bravery. However, Macbeth was only guided by his wife; he chose to play outRead MoreDownfall of Macbeth1659 Words   |  7 PagesThe tragedy of â€Å"Macbeth, by William Shakespeare, follows the fall of Macbeth from a man in a position of power with a contented life, to a man with nothing but â€Å"mouth honor† and a corrupted soul. In this essay, I wish to show to what extent Macbeth’s tragedy was his own fault. The downfall of Macbeth begins early on in the play when he and Banquo (a fellow Scottish noble) meet the witches. The witches waylay Macbeth and Banquo whilst they were on their way to meet Duncan, King of Scotland. TheyRead MoreThe Downfall of Macbeth865 Words   |  3 PagesThe Downfall of Macbeth Many of people have heard the tragedy of Macbeth by William Shakespeare. The story revolves on a sequence of misfortunate events that take place when Macbeth makes immoral decisions to be king. In the play, Shakespeare shows how power can cause corruption in a human’s brain. Macbeth himself was not a very confident person, though he had a kind soul to begin with, he was easily influenced and gullible. Through the prophecies of the evil beings, an insignificant seed was plantedRead More Macbeths Downfall Essay668 Words   |  3 Pages In William Shakespeare’s Macbeth, the main character, Macbeth, is a brave and loyal subject to the King of Scotland, but as the play progresses, his character begins to change drastically. Evil and unnatural powers, as well as his own passion to become king, take over his better half and eventually lead to his downfall. The three main factors that intertwine with one another that contribute to Macbeth’s tragic end are the prophecie s told by the three witches, Lady Macbeth’s influence, and finallyRead MoreCauses of Macbeths Downfall1445 Words   |  6 Pagesï » ¿Causes of Macbeths Downfall – Essay By Jordan Koorey Shakespeare’s Macbeth, based on a play written in 1605 explores the life journey of Macbeth as he climbs the ladder of the social hierarchy. Determined to become King, Macbeth will kill any and all that get in his way. Driven by ambition, Macbeth puts his faith in the words and prophecies of three witches after a prediction that Macbeth would gain the new title of Thane of Cawdor. Alongside with ambition, Lady Macbeth, is a key instrument toRead MoreThe Downfall of Macbeth Essay1239 Words   |  5 PagesThe Downfall of Macbeth All through the play Macbeth strives for power. This motivation affects every aspect of his life and eventually leads to his demise. Many different factors come together in deciding his ill-fated future. With his wifes cajoling and the three witches foretelling of his future, Macbeth, will stop at nothing to gain the position as King of Scotland. The witches and their prophecies are the first major influence which trigger MacbethsRead MoreMacbeth and His Downfall1613 Words   |  7 PagesShakespeare’s Macbeth, there are two factors that contributed to Macbeths ruin. One of them being more to blame: The influential character of Lady Macbeth displaying temptation towards Macbeth, or Macbeths own ambitious and insecure nature. There are questions whether Macbeths downfall might have displayed more for his own blame. In closer examination, it will be come apparent that Macbeth is more to blame for his downfall. By first examining the influential acts of Lady Macbeth that made Macbeth commitRead MoreMacbeth Downfall Analysis911 Words   |  4 PagesMacbeth is a popular play that is known all over the world. William Shakespeares play Macbeth is about a nobleman named Macbeth whose ambition is responsible for his downfall. He is corrupted as a result of his rise to power. Shakespeare succeeds in getting the audience to love Macbeth despite the fact he is much less sinned against than sinn ing. The audience is drawn to Macbeth because he is pressured by the witches, does not have a malicious nature, is ambitious, agonizes between decisions,Read MoreThe Downfall of Lady Macbeth1371 Words   |  6 PagesIn Shakespeare’s Macbeth, Lady Macbeth’s desire and ambition leads to her eventual downfall. When Lady Macbeth hears of Macbeth’s prophecy she dreams of the glory and high-standing that awaits being queen. She cannot withhold her ambitions and she is willing to manipulate fate to bring about Macbeth’s prophecy. She invokes evil spirits to be filled from head to toe with cruelty to do the evil actions necessary to make Macbeth king and to remove all remorse and pity for her action from her heart.Read MoreEssay on The Downfall of Macbeth1474 Words   |  6 PagesThe Downfall of Macbeth      Ã‚  Ã‚   Macbeth is victorious; he has just returned from the battle ground as a brutal warrior; courageous, but what is more, heroic.   At this point in the play, Macbeths reputation is rapidly growing with the rampant spread of the word of his good deeds at war.   This climaxes when his actions are acknowledged and rewarded by the title given to him by King Duncan,    No more that thane of Cawdor doth deceive our bosom interest. - Go, pronounce his present

International Business for Theory and Practice- myassignmenthelp

Question: Discuss about theInternational Business for Theory, Process and Practice. Answer: Oral Presentationrepresents the best platforms for combining the non verbal cues with the effective verbal skills which adds a broader aspect to the communication. In a way, this form of communication allows the individuals in presenting their views and thoughts towards a live audience (Luthans and Doh 2018). This aspect makes be quite interested towards an oral presentation topic. The topic that I have chosen for my Oral presentation is Quantas Airline, an Australian carrier with the largest fleet size. For the presentation I had to collect the necessary material and information and organizing them so that the presentation has a flow. For instance, I had to do analysis on the company vision, industry structure, external and internal analysis, compare the revenue with its competitors and understand whether it has a competitive advantage. The process in way thus helped in enhancing the knowledge of accounting, management and finance. The sources of research from the oral presentation topic have been mostly journals, textbooks and library. However, to get hold of the more recent updates I have also referred to the newspaper and internet. In most of the cases every participant in the group does not do their fair share of work which drives the necessity for the emergence of a leader for guiding a group (Katzenbach and Smith 2015). However, in my case all the group members contributed equally so that that they receive the same grade for the oral presentation. Moreover they also completed their assigned parts on time. Most of the work was performed individually by the group through the required research. However, for gaining certain practical overview regarding the company and to make the presentation more realistic, the group seek the overview of the family members and the friends. The layout, content and the visual aid seems to be perfectly fine and are prepared through adequate and proper research. The facts and figures also seem to be realistic and the will help the audience in getting an overview Quantas Airline. While preparing the oral presentation, the greatest strengths have been the enhanced efficiency of every member and the ability to focus on the same problem through different perspectives (Kuratko 2016). Audience will be really happy to see the visual aids used along with the facts, charts, graphs and figures. However, there were certain inherent weakness which I feel was evident. The slides presented could have been more colourful with more elaborate information which was the limitation of creativity of the team. While preparing for this Oral presentation I have learnt that it follows a more personal and less formal tone. One can discuss various aspects of an organization in a shorter period of time. This form of presentation creates a greater impact to the audience. The oral presentation usually have a linear nature in the form of slides that forces presenter in reducing the complex subjects to specified set of the bullet items that sometimes remain too weak for supporting the process of decision making(Hill, Jones and Schilling 2014). References: Hill, C.W., Jones, G.R. and Schilling, M.A., 2014.Strategic management: theory: an integrated approach. Cengage Learning. Katzenbach, J.R. and Smith, D.K., 2015.The wisdom of teams: Creating the high-performance organization. Harvard Business Review Press. Kuratko, D.F., 2016.Entrepreneurship: Theory, process, and practice. Cengage Learning. Luthans, F. and Doh, J.P., 2018.International management: Culture, strategy, and behavior. McGraw-Hill.