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Scale characteristics of the bloom event: A case study in the Iranian coastal waters of the Southern Caspian Sea

محل انتشار: مجله علوم شیلات ایران، دوره: 18، شماره: 1
سال انتشار: 1397
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 90

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لینک ثابت به این مقاله:
https://civilica.com/doc/1396923

شناسه ملی سند علمی:

JR_JIFRO-18-1_010

تاریخ نمایه سازی: 23 بهمن 1400

چکیده مقاله:

Nutrient enrichment in water and sediments due to excessive anthropogenic activities in recent years has caused excessive algal growth in the Caspian Sea. The current study was conducted to determine the abundance of phytoplankton community, the dominant species and chlorophyll-a [Chl-a] concentration during algal blooms in the Iranian coastal waters of Caspian Sea through four seasons from ۲۰۱۳ to ۲۰۱۴. The minimum and maximum phytoplankton abundance recorded were ۷۳±۳۱ and ۵۰۵±۵۵ million cells m-۳ in summer and winter, respectively. The median concentration of Chl-a increased to ۵.۸۱ mg m-۳ in autumn, as compared to the annual median value (۲.۴۳ mg m-۳). The results indicated that the bloom started in autumn and it continued falling with a low concentration during winter (Chl-a: ۲.۵۹ mg m-۳). The three species Stephanodiscus socialis, Binuclearia lauterbornii and Thalassionema nitzschioides were classified in medium bloom class (۱۰۰-۱۰۰۰ million cells m-۳) in spring, summer and autumn, respectively. While in winter Pseudonitzschia seriata (harmful species) and Dactyliosolen fragilissima were classified in medium bloom class with high relative frequency. The scaling of bloom abundance revealed that bloom initiation coincided with ۱۰ million cells m-۳ of the dominant phytoplankton species. The bloom at the regions with more than ۱۰۰ million cells m-۳ of total phytoplankton abundance and dominant species was overlapped with the bloom regions based on Chl-a concentration. 

کلیدواژه ها:

Phytoplankton ، Bloom ، Scale characteristics ، Caspian Sea ، Iran

نویسندگان

A. Makhlough

Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Iran

H. Nasrollahzadeh Saravi

Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Iran

F. Eslami

Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Iran

A.R. Keyhansani

Caspian Sea Ecology Research Center (CSERC), Iranian Fisheries Science Research Institute (IFSRI), Agricultural Research, Education and Extension Organization (AREEO), Sari, Iran

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