جستجوی مقالات مرتبط با کلیدواژه "khark" در نشریات گروه "محیط زیست"

Considering the importance of corals in different dimensions of human life, their investigation and study will become more necessary. Kharg and Khargo islands are very important from the point of view of the environment, especially the unique coral covers. In the past few decades, many potential threats such as destructive human activities related to the oil industry and the resulting wastes in coastal environments, oil and hydrocarbon pollution, industrial and urban pollution, air pollution, discharge of municipal effluents and sewage, thermal stresses caused by changes Climatic and fluctuating middle and upper water levels, fishing with nets by fishermen and hunting fish by divers in coral areas, as well as carelessness of divers, have faced many challenges in coral habitats. One of the activities that is in relative conflict with the ecosystem of Khark Island and especially the location of the coral beaches, is the activities and movements related to fishing in Khark and Khargo Island. These activities date back several decades. Extreme poverty in many areas has caused a large number of people to go fishing. Therefore, the purpose of this study is to examine the various aspects of the fishing challenge that threatens the geographical territory of coral reefs. The aim of this study is to emphasize the investigation of human-environmental challenges.

In this research, for evaluate and investigate the threats created in the geographical area the first step we investigated the challenges of fishing activity of Khark Island. Then these challenges were classified and finally analyzed and investigated the contribution of each of its aspects in the fishing communities near the coral habitat of Kharg and Khargo islands. In order to investigate fishing and fishing challenges, using the statistical method of Cronbach’s alpha analysis and Likert scale. For trust final results and analyzes must the confidence percentage was calculated and confirmed. The weights of each of the criteria were finalized by the SWARA fuzzy-numerical test. In this questionnaire, there are 21 questions and Cronbach’s alpha is at an acceptable and good level of 0.72.

In the questionnaire of this research, there are 21 questions and the Cronbach's alpha level is at an acceptable and good level of 0.72. It was found that trust in the content of the questionnaire confirms. The effectiveness and weight of each of the criteria showed that the highest percentage of fishing is done by motor boats in the winter season and early in the morning (93%). The results showed that more than 85% of fishermen have not received any necessary training for fishing in coral areas, and this challenge is considered serious and fundamental. The results showed that more than 85% of fishermen have not received any necessary training for fishing in coral areas, and this challenge is considered serious and fundamental.

The output indicates that the fishing tool is valued as a criterion with the first rank, in other words, it explains 31% of the weight of the items. On the other hand, fishing time has the lowest weight in the criteria definition with 23%. These statistical processes show that human-environmental factors should be prioritized in examining the challenges and threats of the coral reef in Khark Island. In other words, the control and management of man-made challenges and related factors can create safe coral environments.

Environmental contamination of biorecomedatoin, based using microorganisms have found spread usage today. According to diversity’s metabolic microorganism and ability of their utilize from environmental contaminant as food. Microorganism also can contamination as food and convert them to material with high permanent and low toxin. If we have appropriate selection about them, we can analysis, absorption and delete various contamination by the microorganisms. We take sample from water and sediment from 7 stations on intertidal zone in Coast of Khark Island for obtains bacteria that live in sea and decrease heavy metal such as nickel and vanadium. Collected specimen cultured in environment culture of Nutrient Agar salted and environment culture of rich sea water. We evaluate by two quantity and quality with inoculated with the liquid environment BHI Broth for measurement resistance and uptake of heavy metals nickel and vanadium. We evaluate growth rate bacteria in 300 ppm of nickel and 250 ppm vanadium by Spectrophotometer UV device and absorption atomic device evaluate measurement rate of uptake vanadium and nickel by bacteria. Then, using biochemical tests both Bacillus sp. PGS4 and Bacillus sp. PGS10 were identified that were resistant. Bacillus sp. PGS4 and Bacillus sp. PGS10 had % 80.61 and %77.99 absorption of nickel 300 ppm respectively. These organisms had%70.80 and %67.58 absorption of vanadium 250 ppm.