جستجوی مقالات مرتبط با کلیدواژه « mangrove forest » در نشریات گروه « محیط زیست »

In this study, we reviewed the state of knowledge of mangrove vulnerability and responses to predicted climate change impacts. It would be complex and difficult to identify response to sea level rise, increasing temperature and precipitation pattern changes. Mangrove ecosystems are expected to exhibit a synergistic response to a combination of the climatic, anthropogenic and natural impacts

Among all climate change impacts, relative sea-level rise may be the greatest threat to mangroves. Tidal gauge renege and the rate of sediment supply are the most important factors in mangroves forest response to the sea level rise.

If the compensation factors like surface sediment elevation augment did not work, mangroves seaward might depredate. On the other hand, the larger tide range in an area would result the lower mangrove damage. These responses would relate to the site-specific topographic properties which could determine possibility of mangrove landward migration. Most of the mangroves responses to the impact of climate change will be site-specific, also it would be impossible to extrapolate these responses from one place to other places.

Some of the adaptation measures in coastal areas against the climate change impacts include designing coastal defense systems such as embankments, planting and constructing mangrove forests, building flood facilities, retreating from the shoreline and managing the new shoreline, mapping risk and warnings and awareness to residents.

This study aimed to identify and determine the species diversity of fish in the Arizin creek in the east of Hormozgan province for one year in 1395. Sampling of fish by trawls boat and was done seasonally. In this study, 41 species belonging to 30 genus and 26 families were identified. The greatest abundance and diversity were related to Leiognathidae and Clupeidae families with 19.2 and 15.3 percent respectively. The most frequent species in the spring season, Thryssa vitrirostris 45.8 %, Summer leiognathus fasciatus 36.3 %, autumn, Gerres filamentosus 20.8% and in winter leiognathus fasciatus13.2 %, respectively. The abundance of fish in the spring with other seasons, there was a significant difference (p <0.05) planktonic feeder species were the most frequent in the spring. In other seasons, fish with small carnivorous diet and Hunter were more abundant. Families Leiognathidae, Platycephalidae, Gerreidae, Sillaginidae and Haemulidae samples were collected in all seasons. Shannon diversity index was highest and lowest values in winter and spring with 1.33 and 0.86, respectively. Also the highest richness index was 4.5 and 2.64, respectively, in the winter and spring and maximum value evenness were 0.42 and 0.31 in the winter and spring.

Introdoction: The Qeshm Island Mangrove forests are located at southern coast of Iran, near the highest latitude of Mangrove in Southeast of Asia. Due to the importance of all aspects of mangrove forest and to prompte it as one of the most significant world ecosystems the ever increasing destruction of thease natural resources, it is essential to preserve, restore and develop thease forest in Iran.
Material & In this study, mangrove forest areas were determined for 1988, 1998 and 2008; then, the changes were detected by comparing satellite data related to two periods of 1988-1998 and 1998-2008 in the northwest of Qeshm Island.
Result & diction: The results showed that over the past two decades, significant changes have occurred in this area. In the first period, the total forest area increased from 5160.52 ha in 1988 into 5308.32 ha in 1998, i. e., the forest area had developed 181.7 ha (about 5/3%) during 10 years. In other words, the annual average growth rate of these forests was 0.35 percent, equivalent to 18.7 ha per year during that 10 year period. In the second period, the forest area of developed from 5308.32 ha in 1998 into 5512.7 ha in 2008, i. e., the forest area has been developed 204.4 ha, (3.8 %) in the second period 10 year. In other words, the annual average growth rate of the forest 0.38 percent (20.4 ha) per year during the second period. In this study,the main factor for the development of area has been causes natural regeneration and in cases of Afforestation mangrove forests in these areas.