hamid rezai - Academia.edu (original) (raw)

Papers by hamid rezai

Estuarine Coastal and Shelf Science, 2008

Fiddler crabs are known as the most conspicuous bioturbating animals in mangrove forest, which by... more Fiddler crabs are known as the most conspicuous bioturbating animals in mangrove forest, which by their burrowing activities promote nutrient cycling in ecosystems. Mangroves, crabs and bacteria are connected in the form of positive feedback loop, whereby an increase in the activity of any participant will tend to increase the activity of all others as well. Population structure, growth, mortality, recruitment, biomass and production of fiddler crabs as dominant species of deposit-feeder crabs have been investigated from May 2005 to March 2006 in the Sirik mangrove estuary in the eastern part of Strait of Hormuz. Ten 1 m 2 squares of the substrate were randomly sampled during low tide. There was a significant change in organic content in the sampling area during study period. The sex ratio was significantly deviated from 1:1 ratio in large sizes, where males were dominated year around. Fiddler crabs showed seasonal growth pattern during a year, which the maximum growth was observed during autumn and early summer and ceased during winter by low temperature. Growth parameters were estimated by Appeldoorn's method and fitted with seasonalized von Bertalanffy growth models. The Kimura likelihood ratio test revealed significant differences in the overall growth curves between males and females, originated from the differences in k and L between sexes. Males were found to exhibit higher growth rate and larger size than females, this could be attributed to the higher investment of energy for reproduction in females. Reproduction was restricted to spring and early summer, while recruitment occurs at the end of summer. Total annual production of males and females was 37.90 and 10.05 g dry weight/10 m 2 respectively and major production took place during early summer. Because of impact of temperature on the activity of fiddler crabs in subtropical regions, density of crabs has significant positive correlation with temperature ( P < 0.01), while growth rate shows significant negative correlation with organic matter of sediment ( P < 0.05). In conclusion these crabs showed lower mortality and production rate with the seasonal growth and recruitment in comparison with tropical species.

Journal of the Persian Gulf, 2010

Field surveys pertaining to coral reef studies were performed from November 2010 to August 2011 a... more Field surveys pertaining to coral reef studies were performed from November 2010 to August 2011 around Larak Island in the Persian Gulf. The Line Intercept Transect (LIT) method was applied to record biotic and abiotic components of the coral reefs at two sites around Larak Island: North East (NE) and South West (SW) with two stations per site. Mean "Live Coral Coverage" (LCC) and “Dead Coral Coverage” (DCC) at SW 21.74% ± 1.92%, 4.58% ± 0.65% and NE sites were 5.69% ± 0.54%, 35.64% ± 3.28% respectively. Dead Coral Coverage was more prevalent in the NE than in SW. Based on Mann-Whitney U-test LCC and DCC showed significant difference (p< 0.05) among these two sites, (p< 0.05); The Kruskal-Wallis test also showed significant difference (p< 0.05) among four stations within two sites. This study indicated that coral communities of the NE site have been more destroyed by human impacts such as municipal run-off, breakwater construction, trap fishing, over-fishing and s...

International Aquatic Research, 2015

This report summarises the status of coral reefs in the ROPME Sea Area which includes Bahrain, Ir... more This report summarises the status of coral reefs in the ROPME Sea Area which includes Bahrain, Iran, Kuwait, Oman, Qatar, Saudi Arabia and United Arab Emirates (UAE); there are no coral reefs in Iraq. The region can be split into three parts according to the local marine climate, which strongly influences the nature of the coral communities: the Persian/Arabian Gulf

Journal of Coastal Conservation, 2014

Galaxea, Journal of Coral Reef Studies, 2011

Hydrobiologia, 1999

A submarine pipeline, constructed in 1997–1998 to provide water to Redang Island, Malaysia traver... more A submarine pipeline, constructed in 1997–1998 to provide water to Redang Island, Malaysia traverses an area covered with corals. Biological studies were conducted before and following pipeline construction to monitor the changes in the biota at selected sites. Benthic invertebrates (including corals) were used as monitoring tools. Student's t-test and one-way ANOVA macroinvertebrates in pre- and post-construction analyses revealed that

Estuarine, Coastal and Shelf Science, 2008