Tidal Influences on Biotic and Abiotic Factors in the Seomjin River Estuary and Gwangyang Bay, Korea

2018 ◽  
Vol 41 (7) ◽  
pp. 1977-1993 ◽  
Author(s):  
Minji Lee ◽  
Bum Soo Park ◽  
Seung Ho Baek
Keyword(s):  
Abiotic Factors ◽  
River Estuary ◽  
Biotic And Abiotic Factors ◽  
Seomjin River ◽  
Gwangyang Bay

"A Study on Water Quality to Understand the Cause of Bloom of Potamocorbula amurensis in Seomjin River Estuary Wetland"

2018 ◽  
Vol 19 (4) ◽  
pp. 322-327
Author(s):  
Hyoung Gon Kim ◽  
Cheong Jo Cheong ◽  
Seon Woo Cheong ◽  
Hyeong Su Kim ◽  
Young Sik Lee
Keyword(s):  
Water Quality ◽  
River Estuary ◽  
Potamocorbula Amurensis ◽  
Seomjin River

scholarly journals Flow cytometric measurements as a proxy for sporulation intensity in the cultured macroalga Ulva (Chlorophyta)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Omri Nahor ◽  
Cristina F. Morales-Reyes ◽  
Gianmaria Califano ◽  
Thomas Wichard ◽  
Alexander Golberg ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Life Cycle ◽  
Abiotic Factors ◽  
Physiological Status ◽  
Seaweed Cultivation ◽  
Reproductive Growth ◽  
Biotic And Abiotic Factors ◽  
Flow Cytometric ◽  
Abiotic Stimuli ◽  
Fundamental Shift

Abstract Controlling the life cycle of the green macroalga Ulva (Chlorophyta) is essential to maintain its efficient aquaculture. A fundamental shift in cultivation occurs by transforming the thallus cells into gametangia and sporangia (sporulation), with the subsequent release of gametes and zoids. Sporulation occurrence depends on algal age and abiotic stimuli and is controlled by sporulation inhibitors. Thus, quantification of sporulation intensity is critical for identifying the biotic and abiotic factors that influence the transition to reproductive growth. Here, we propose to determine the sporulation index by measuring the number of released gametes using flow cytometry, in proportion to the total number of thallus cells present before the occurrence of the sporulation event. The flow cytometric measurements were validated by manually counting the number of released gametes. We observed a variation in the autofluorescence levels of the gametes which were released from the gametangia. High autofluorescence level correlated to phototactically active behaviour of the gametes. As autofluorescence levels varied between different groups of gametes related to their mobility, flow cytometry can also determine the physiological status of the gametes used as feedstock in seaweed cultivation.

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