Friday, January 24, 2020

Tropical Rain Forest Soils of La Selva Essay -- Ecology Wildlife Natur

Tropical Rain Forest Soils of La Selva Tropical rain forests across the globe are currently threatened by massive deforestation for logging, grazing, and cultivation (Otzen 1993). Such land-use practices alter temperature regimes (Fernandes and Sanford 1995) as well as ground, soil, and surface water, flora, fauna, and microorganisms (Otzen 1993). These changes may result in a loss of soil organic matter, a decrease in soil fertility (Garcia-Oliva et al. 1994, Tissen et al. 1994), severe soil erosion (Otzen 1993), and changes in soil structure and chemistry (Fernandes and Sanford 1995, Sollins et al. 1995, Montgagnini and Sancho 1994.) The response of tropical rain forest soils to deforestation depends upon the specific properties of the soils as well as the type of use they are subject to. La Selva Biological Station, located in north-central Costa Rica and containing a mixture of pasture, second growth, and intact forest, provides an excellent opportunity to study the effects of deforestation on examples of three soil orders--Entisols, Inceptisols, and Ultisols. Although limited studies have been conducted on the impact of deforestation on soils in this area, a knowledge of their properties may help predict the nature of the changes that would occur due to deforestation. Such changes will determine whether or not rejuvenation of the rain forest is possible. All soils at La Selva are derived from volcanic parent material. This material came primarily from eroded lava flows, although some material was carried in lahars. At higher elevations, soil parent material consists of lava weathered in place. Both alluvial and colluvial deposits cover the lower elevations, however, which include river terraces of various ages. Mos... ...s: Biogeochemistry (Dordrecht) 6: 181-89. Sollins P., Sancho, Freddy, Mata, Rafael, Sanford, Robert L. Jr., 1994, Soils and soil process research, pages 34-53 in McDade, L. A.; K.S. Bawa; H.A. Hespenheide; and G.S. Hartshorn (eds.), La Selva Ecology and Natural History of a Neotropical Rain Forest: Chicago, University of Chicago Press, 486 p. Tidall, J.M. and J.M. Oades, 1982, Organic matter and water-stable aggregates in soil: Journal of Soil Science 33: 141-63. Tissen, H., E. Cuevas, P. Chacon. 1994. The role of soil organic matter in sustaining soil fertility. Nature 371: 783-785. Uehara, G. and G. Gillman, 1981, The Mineralogy, Chemistry, and Physics of Tropical Soils with Variable Charge Clays: Boulder, Colorado, Westview press. Vitousek, P.M. 1984. Litterfall nutrients cycling and nutrient limitation in tropical forests. Ecology 65: 285-298.

Thursday, January 16, 2020

Duffy: The Real ‘Painful Case’ Essay

In â€Å"A Painful Case,† by James Joyce, the central character is cold, intellectual, and emotionless. The narrator of this story adopts a pessimistic and scathingly negative view of the central character, Mr. Duffy. Duffy is, figuratively speaking, dead. He is dead to the world of passionate emotions that make others ‘alive,’ and he shuns most contact with other humans, especially emotional and intimate contact. He argues that ‘every bond is a bond of sorrow,’ and uses this as justification for not engaging in any relationships of an intimate nature. He has ‘neither companions nor friends, church nor creed.’ Duffy’s room is very telling of his personality as well. â€Å"The lofty walls of his uncarpeted room were free from pictures† (Joyce, 118). It is customary to put up pictures in one’s home of one’s family or friends, but Duffy does not associate with either. He has no joyous memories to immortalize in film and frame on his bedroom wall. His room mirrors the state of his mind: orderly and austere, uncluttered by anything resembling passion. In many respects Duffy is dead. The only intimacy Duffy may have ever felt in his life was with Mrs. Sinico, but even when she dies he initially feels nothing but disgust that he had shared intimate parts of himself with someone who degraded herself with an alcoholic suicide. â€Å"The whole narrative of her death revolted him and it revolted him to think that he had ever spoken to her of what he held sacred. [She had] a commonplace vulgar death. Not only had she degraded herself; she had degraded him. He saw the squalid tract of her voice, miserable and malodorous. His soul’s companion!† (Joyce, 126-127) The extent of Duffy’s aloof fear of intimacy is such that even when Mrs. Sinico dies the only thing he can think about is how her death cheapened him. Eventually, Duffy realizes that ‘he had withheld life from her,’ and ‘he had sentenced her to death.’ He realizes that he, at least in large part, had been responsible for her descent, alcoholism, and eventual suicide. He left her to loneliness when he stopped seeing her, and that loneliness was what prompted her death. â€Å"Now that she was gone he realized how lonely her life must have been, sitting night after night alone in that room† (Joyce, 128). With the realization that he was responsible for Sinico’s death, Duffy realizes that he too will die someday, and, like Mrs. Sinico, become nothing more than a memory. The reason why Mrs. Sinico left memories with Duffy is because she reached out and attempted to become emotionally intimate with him. Unlike Sinico, Duffy never made any such attempts, and recoiled when he realized that their relationship was becoming too close. Because of his lack of warmth and passion, when Duffy dies it is likely that no one will even remember him, and he realizes this. â€Å"His life would be lonely too until he, too, died, ceased to exist, became a memory- if anyone remembered him†¦ He gnawed the rectitude of his life; he felt that he had been outcast from life’s feast†¦ no one wanted him† (Joyce, 128-127) However, even after Duffy comes to this painful realization he still has little hope of altering his lifestyle to be more passionate and ‘alive.’ This is shown by Duffy’s thoughts of Sinico near the end of the story. Initially, he can feel her presence. â€Å"She seemed to be near him in the darkness. At moments he seemed to feel her voice touch his ear, her hand touch his† (Joyce, 128). Later, he sees a goods train emerging from the Knightsbridge station, and imagines the ‘laborious drone of the engine reiterating the syllables of her name.’ In this manner he personifies her spirit with the train. After the train leaves, so does his feeling that she is still there next to him; after the train leaves he feels utterly alone again. â€Å"He listened again: perfectly silent. He felt that he was alone.† Duffy dismisses Sinico’s spirit, and by dismissing her, he also dismisses any hope he had of learning to live. In this manner the narrator provides a pessimistic view of Duffy, while showing the reader how Duffy has little hope of learning to feel passion even after Sinico’s death. The newspaper refers to Mrs. Sinico’s death as ‘a most painful case.’ However, the title of the story really refers to Mr. Duffy. He is, in fact, the real painful case.

Wednesday, January 8, 2020

8 Stages of Psychosocial Dilemmas - 1757 Words

In Dr. Eric Erikson’s 8 Stages of Psychosocial Dilemmas he stated that conflict between personal impulse and the social world. Erikson also believed that a sense of competence also motivates behaviors and actions. Each stage in Erikson’s theory is concerned with becoming competent in an area of life. If the stage is handled well, the person will feel a sense of mastery. Being able to master the dilemma during each stages of Erikson’s psychosocial development creates a sense of success and well development accomplishment. Being able to strive for a healthy growth and future endeavors in later stages. On the contrary if you are unable to fully develop in the early stages will make it harder to deal with later stages. Erikson’s 8 Stages of†¦show more content†¦Through social interactions, children begin to develop a sense of pride in their accomplishments and abilities. During the industry versus inferiority the children begin to perform complex task and upon completion the child feels empowered and a sense of accomplishment which gives him confidence to try even more grueling intricate tasks. While on the contrary if a child is unable to receive encouragement from their parents, teachers, and peers they feel a sense doubt about there success. An example of stage four close to my life is my little cousin Marcos. The little dude is amazingly smart due to the fact he is encouraged by his parents and his peers. He is sincerely able to take on new tasks and be a leader in his own mind. Every task that Marcos is able to accomplish begins by his parents’ push him to strive for success and he tackles all his task head on. During the fifth stage of Erikson’s psychosocial development it is considered the adolescence identity versus role confusion occurs. Teens need to develop a sense of self- discovery and personal identity. The teen usual does this by aligning yourself with other peers with similar interested either in music, hobbies, or other activities. As they make the transition from childhood to adulthood, teens may begin to feel confused or insecure about themselves and how they fit in to society. I found this to be true while growing up and going through my adolescent years I found it difficultShow MoreRelatedAdolescence Is A Critical Time For A Human1405 Words   |  6 Pagesunfulfilled (p. 317). Many theories have been established in regard to development focusing on the psychosocial, moral, and faith development of the human. These theories can simply be viewed as offering a lens to study human development and why the development is important for the outcome of a one’s mental health. 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