Research Article: Spatial distribution and structure of benthic polychaete communities in shallow waters of the south Caspian Sea, Iran
- سال انتشار: 1401
- محل انتشار: مجله علوم شیلات ایران، دوره: 22، شماره: 1
- کد COI اختصاصی: JR_JIFRO-22-1_004
- زبان مقاله: انگلیسی
- تعداد مشاهده: 253
نویسندگان
۱Department of Marine Biology, Faculty of Marine Science and Oceanography, Khorramshahr University of Marine Science and Technology, Khorramshahr, ۶۶۹, Iran.
Khorramshahr University of Marine Science and Technology, Khorramshahr
Khorramshahr University of Marine Science and Technology, Khorramshahr
۳Fisheries Department, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
۴Hormoz Strait Oceanography Center, Iranian National Institute for Oceanography and Atmospheric Science, Iran
چکیده
Polychaetes are the most abundant taxon in benthic communities. The polychaete assemblages on the Iranian Caspian Sea coast were studied during the summer of ۲۰۱۶ and winter of ۲۰۱۷ to examine the spatial-temporal variability in diversity and community structure, as well as their relationships with the main environmental variables. As a representative of the study area, fifteen stations at ۱, ۳, and ۵ m depths were chosen. Capitella capitata was reported for the first time in the Caspian Sea. Four species were found: Streblospio gynobranchiata, Alitta succinea, Hypania invalida, and Capitella capitata. The eastern transect (Gorgan Bay) had the highest total abundance of polychaetes (۱۵۱۴۶ ind.m۲) with increasing in the abundance of S. gynobranchiata. Furthermore, S. gynobranchiata appears to be well-distributed in this sea and plays the most prominent role in the community structure. A. succinea, S. gynobranchiata, and C. capitata showed an increasing trend from the western to the eastern parts of the shoreline. Changes in polychaetes abundance can be attributed to changes in the sediment type, with western transects containing more sand and eastern transects comprising silt-loam. Total polychaete abundance was correlated with salinity, water temperature, depth, dissolved oxygen, Total Organic Matter and sediment characteristics in the summer and winter seasons, according to the Canonical correlation analysis. S. gynobranchiata and C. capitata, as invasive species, may have altered the current polychaete community distribution, structure, and diversity in the southeast Caspian Sea. The disappearance of some species and the decrease in species richness could be due to the success of S. gynobranchiata in the competition for resources and space. Other conditions such as environmental factors and pollutants can also affect the presence of sensitive and tolerant organisms.کلیدواژه ها
Capitella capitata, Community diversity, Environmental parameters, Sediment analysis, Streblospio gynobranchiataاطلاعات بیشتر در مورد COI
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