The abundance and health of scleractinian coral communities of Hormuz Island were investigated.For this purpose,we employed 20 m line intercept transects—12 in the intertidal zone and 15 subtidally to evaluate coral ...The abundance and health of scleractinian coral communities of Hormuz Island were investigated.For this purpose,we employed 20 m line intercept transects—12 in the intertidal zone and 15 subtidally to evaluate coral cover and community composition.The estimated dead coral coverage was 6.21%±0.81%,while live coral coverage was 16.93%±1.81%,considered as very poor.Totally,12 genera were recorded,of which Porites with 11.9%±1.4%live cover was the dominant,while Goniopora had the least cover(0.07%±0.08%).Based on Mann-Whitney U-test,live coral coverage,dead coral coverage,algal coverage,cover of other benthic organisms and abiotic components showed significant univariate differences between zones(p<0.05).The Spearman correlation test between the abundance of biotic and abiotic components indicated significant negative correlation of live coral and sand with zoantharian and significant positive correlation of algae and other benthic organisms with rubble.The reef health indices used for the corals indicated that,in general,the environmental conditions were not suitable,which could be attributed to both natural and anthropogenic factors,the most important of which was zoantharian’overgrowth on the scleractinian corals in this region.展开更多
The spatial and temporal distribution patterns of the zooplankton of Chabahar Bay, Gulf of Oman were investigated. Zooplankton sampling was collected twice a season at five stations in Chabahar Bay. Sampling was done ...The spatial and temporal distribution patterns of the zooplankton of Chabahar Bay, Gulf of Oman were investigated. Zooplankton sampling was collected twice a season at five stations in Chabahar Bay. Sampling was done during July-August 2007 （SW-monsoon）, October-November 2007 （post-monsoon）, January-February 2008 （NE-monsoon）, and March-May 2008 （pre-monsoon）. Five stations were investigated throughout Chabahar Bay. Four species of Oncaeidae （Oncaea media, Oncaea minuta, Oncaea venusta and Oncaea clevei） were identified. The abundance of Oncaea media was maximum in the post-monsoon （〉 700 ind..m3） and disappeared in pre-monsoon while Oncaea minuta was maximum in post-monsoon （〉 130 ind..m3） and disappeared in NE-monsoon and pre-monsoon. Oncaea venusta showed the highest abundance in post-monsoon （〉 370 ind..m3） and the lowest in pre-monsoon （〈 55 ind..m-3）. The highest abundance of Oncaea clevei was in post-monsoon （〈 240 ind..m-3） and lowest in NE-monsoon. Overall, the highest abundance of Oncaeidae was observed in post-monsoon. The results showed that depth was the most important factor controlling abundance of the Oncaeidae. Spatially, the highest abundance of Oncaeidae species was found in off shore stations. Four species of this family showed positive correlation with depth. Also, O. venusta showed negative correlation with salinity that showed this species prefers low saline water.展开更多
文摘The abundance and health of scleractinian coral communities of Hormuz Island were investigated.For this purpose,we employed 20 m line intercept transects—12 in the intertidal zone and 15 subtidally to evaluate coral cover and community composition.The estimated dead coral coverage was 6.21%±0.81%,while live coral coverage was 16.93%±1.81%,considered as very poor.Totally,12 genera were recorded,of which Porites with 11.9%±1.4%live cover was the dominant,while Goniopora had the least cover(0.07%±0.08%).Based on Mann-Whitney U-test,live coral coverage,dead coral coverage,algal coverage,cover of other benthic organisms and abiotic components showed significant univariate differences between zones(p<0.05).The Spearman correlation test between the abundance of biotic and abiotic components indicated significant negative correlation of live coral and sand with zoantharian and significant positive correlation of algae and other benthic organisms with rubble.The reef health indices used for the corals indicated that,in general,the environmental conditions were not suitable,which could be attributed to both natural and anthropogenic factors,the most important of which was zoantharian’overgrowth on the scleractinian corals in this region.
文摘The spatial and temporal distribution patterns of the zooplankton of Chabahar Bay, Gulf of Oman were investigated. Zooplankton sampling was collected twice a season at five stations in Chabahar Bay. Sampling was done during July-August 2007 （SW-monsoon）, October-November 2007 （post-monsoon）, January-February 2008 （NE-monsoon）, and March-May 2008 （pre-monsoon）. Five stations were investigated throughout Chabahar Bay. Four species of Oncaeidae （Oncaea media, Oncaea minuta, Oncaea venusta and Oncaea clevei） were identified. The abundance of Oncaea media was maximum in the post-monsoon （〉 700 ind..m3） and disappeared in pre-monsoon while Oncaea minuta was maximum in post-monsoon （〉 130 ind..m3） and disappeared in NE-monsoon and pre-monsoon. Oncaea venusta showed the highest abundance in post-monsoon （〉 370 ind..m3） and the lowest in pre-monsoon （〈 55 ind..m-3）. The highest abundance of Oncaea clevei was in post-monsoon （〈 240 ind..m-3） and lowest in NE-monsoon. Overall, the highest abundance of Oncaeidae was observed in post-monsoon. The results showed that depth was the most important factor controlling abundance of the Oncaeidae. Spatially, the highest abundance of Oncaeidae species was found in off shore stations. Four species of this family showed positive correlation with depth. Also, O. venusta showed negative correlation with salinity that showed this species prefers low saline water.
