The aim of my study was to monitor environmental conditions and distributions of jellyfish and to reveal its ecological features, and also to study relationship between environmental conditions (water temperature, salinity, sigma-t, DO, COD, SS and Chl-a) and jellyfishes at two sampling stations for...
The aim of my study was to monitor environmental conditions and distributions of jellyfish and to reveal its ecological features, and also to study relationship between environmental conditions (water temperature, salinity, sigma-t, DO, COD, SS and Chl-a) and jellyfishes at two sampling stations for one year. Biweekly sampling was carried out at coastal waters (Soho dong: Stn. 1, Jonghwa dong: Stn. 2) in Yeosu from October 2008 to September 2009. The difference in environmental conditions at two sampling stations was less. But Stn. 1 had more stable features. The number of jellyfish species was 4 species (Aurelia aurita, Muggiaea sp., Sarsia tubulosa, Spirocodon saltatrix) at Stn. 1 and 10 species (Aurelia aurita, Clytia sp., Cynanea nozakii, Liriope tetraphylla, Muggiaea sp., Olinias formosa, Pandeidae sp., Phialellidae sp., Aglantha digitale, Spirocodon saltatrix) at Stn. 2. The opened area (Stn. 2) appeared to be with more species diversity than the semi-enclosed bay (Stn. 1). Hence, the number of individuals at Stn. 1 was much higher than Stn. 2. Spirocodon saltatrix was dominant in water temperature from 8 → to 12 → both stations. When the water temperature rises, A. aurita begins to appear and the size was larger (dimeter >10cm) at 20 → at Stn. 1. Almost all species were correlated with physical factors and DO, but only two species correlated to Chl-a, and each species had separate tolerance in water temperature and salinity.
Aurelia aurita blooming in Korean coastal waters becomes a serious problem. This bloom is caused by outbreak in early stages. This study has been focused on settlement of planulae larvae in life stages. Hence, studies about settlement of planulae were carried out related to water temperature and salinity, substrate choice and settlement preferences. Experiment set up was made with 6 combinations, water temperature set up 20, 25 → and salinity 30, 32, 34 psu. It was revealed that the preferred temp. & sal. is 20 → and 30 psu. Respectively, the number of settlement at 20 → was higher than at 25 →, there were not on settled planulae at 34 psu. Settlement and growth at 32 psu were more preferred than at 30 psu during early days, the figures showed life strategy in unsuited salinity conditions. To reveal the settlement preferences, was made 5 settling plates (polyethylene terephthalate, acrylic, rubber, glass, machined wood). PET was the most preferred settling site than others. Almost all settling plates was preferred settlement on undersides. But in about 10 days, percentage of settlement on topsides increases. The reason why planulae dropped from surface water to plates is unknown. It might be due to diverse environmental factors, sometimes they may affect settlement of planulae. Hence, it is imperative to study about other environmental factors and wide ranges in physical factors as a future research.
The aim of my study was to monitor environmental conditions and distributions of jellyfish and to reveal its ecological features, and also to study relationship between environmental conditions (water temperature, salinity, sigma-t, DO, COD, SS and Chl-a) and jellyfishes at two sampling stations for one year. Biweekly sampling was carried out at coastal waters (Soho dong: Stn. 1, Jonghwa dong: Stn. 2) in Yeosu from October 2008 to September 2009. The difference in environmental conditions at two sampling stations was less. But Stn. 1 had more stable features. The number of jellyfish species was 4 species (Aurelia aurita, Muggiaea sp., Sarsia tubulosa, Spirocodon saltatrix) at Stn. 1 and 10 species (Aurelia aurita, Clytia sp., Cynanea nozakii, Liriope tetraphylla, Muggiaea sp., Olinias formosa, Pandeidae sp., Phialellidae sp., Aglantha digitale, Spirocodon saltatrix) at Stn. 2. The opened area (Stn. 2) appeared to be with more species diversity than the semi-enclosed bay (Stn. 1). Hence, the number of individuals at Stn. 1 was much higher than Stn. 2. Spirocodon saltatrix was dominant in water temperature from 8 → to 12 → both stations. When the water temperature rises, A. aurita begins to appear and the size was larger (dimeter >10cm) at 20 → at Stn. 1. Almost all species were correlated with physical factors and DO, but only two species correlated to Chl-a, and each species had separate tolerance in water temperature and salinity.
Aurelia aurita blooming in Korean coastal waters becomes a serious problem. This bloom is caused by outbreak in early stages. This study has been focused on settlement of planulae larvae in life stages. Hence, studies about settlement of planulae were carried out related to water temperature and salinity, substrate choice and settlement preferences. Experiment set up was made with 6 combinations, water temperature set up 20, 25 → and salinity 30, 32, 34 psu. It was revealed that the preferred temp. & sal. is 20 → and 30 psu. Respectively, the number of settlement at 20 → was higher than at 25 →, there were not on settled planulae at 34 psu. Settlement and growth at 32 psu were more preferred than at 30 psu during early days, the figures showed life strategy in unsuited salinity conditions. To reveal the settlement preferences, was made 5 settling plates (polyethylene terephthalate, acrylic, rubber, glass, machined wood). PET was the most preferred settling site than others. Almost all settling plates was preferred settlement on undersides. But in about 10 days, percentage of settlement on topsides increases. The reason why planulae dropped from surface water to plates is unknown. It might be due to diverse environmental factors, sometimes they may affect settlement of planulae. Hence, it is imperative to study about other environmental factors and wide ranges in physical factors as a future research.
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#jellyfish Aurelia aurita
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