Study on Chlorophyll a （Chl. a） distribution and bloom patterns is essential in the upwelling areas that constitute the main fishery grounds of Vietnam. Based on high resolution satellite imagery and monthly in-situ...Study on Chlorophyll a （Chl. a） distribution and bloom patterns is essential in the upwelling areas that constitute the main fishery grounds of Vietnam. Based on high resolution satellite imagery and monthly in-situ data in period from 2007 to 2008, the spatial and temporal variations ofChl, a in the upwelling region including algal blooms have been detected. Anomalies of higher Chl. a concentration and bloom patterns occurred at different periods, locations, and bloom shapes in coastal waters of Southern Center of Vietnam. The appearances of these bloom are related to four difference reasons, such as： （i） Their locations coincided to main center of upwelling phenomena that usually occur during southwest monsoon （SWM）; （ii） Effect of northeast monsoon （NEM） that brings and attaches the nutrient into the coast and created ＂floating＂ algae bloom patches in coastal zones; （iii） The algae blooms can be potentially associated with Harmful Algae Bloom （HAB） during the SWM or local eddies during NEM and （iv） Their appearances are also as a result of distinctive nutrient inflow fi＇om Mekong delta and pumping of nutrients by internal waves in coastal shallow waters.展开更多
We measured the concentrations and distribution of major polyamines(spermine, putrescine and spermidine) in seawater during successive spring algal blooms in an area of frequent harmful blooms in the East China Sea. S...We measured the concentrations and distribution of major polyamines(spermine, putrescine and spermidine) in seawater during successive spring algal blooms in an area of frequent harmful blooms in the East China Sea. Spermine, putrescine, and spermidine concentrations were analyzed by high performance liquid chromatography and ranged from 1–64, 7–81, and 0–19 nmol/L. Spermine was present at the highest concentrations, followed by putrescine and spermidine. In late April, when a diatom bloom dominated by Skeletonema costatum dispersed, polyamine concentrations increased, presumably as a result of diatom decomposition. In early May, when a dinoflagellate bloom dominated by Prorocentrum donghaiense occurred, the polyamine concentration decreased from the level seen in late April. The abundant polyamines that decomposed and were released during the diatom bloom in late April may have promoted the growth of P. donghaiense, resulting in its dominance.展开更多
文摘Study on Chlorophyll a （Chl. a） distribution and bloom patterns is essential in the upwelling areas that constitute the main fishery grounds of Vietnam. Based on high resolution satellite imagery and monthly in-situ data in period from 2007 to 2008, the spatial and temporal variations ofChl, a in the upwelling region including algal blooms have been detected. Anomalies of higher Chl. a concentration and bloom patterns occurred at different periods, locations, and bloom shapes in coastal waters of Southern Center of Vietnam. The appearances of these bloom are related to four difference reasons, such as： （i） Their locations coincided to main center of upwelling phenomena that usually occur during southwest monsoon （SWM）; （ii） Effect of northeast monsoon （NEM） that brings and attaches the nutrient into the coast and created ＂floating＂ algae bloom patches in coastal zones; （iii） The algae blooms can be potentially associated with Harmful Algae Bloom （HAB） during the SWM or local eddies during NEM and （iv） Their appearances are also as a result of distinctive nutrient inflow fi＇om Mekong delta and pumping of nutrients by internal waves in coastal shallow waters.
基金Supported by the National Basic Research Program of China(973 Program)(No.2010CB428701)the National Natural Science Foundation of China(Nos.40976047,42176118)
文摘We measured the concentrations and distribution of major polyamines(spermine, putrescine and spermidine) in seawater during successive spring algal blooms in an area of frequent harmful blooms in the East China Sea. Spermine, putrescine, and spermidine concentrations were analyzed by high performance liquid chromatography and ranged from 1–64, 7–81, and 0–19 nmol/L. Spermine was present at the highest concentrations, followed by putrescine and spermidine. In late April, when a diatom bloom dominated by Skeletonema costatum dispersed, polyamine concentrations increased, presumably as a result of diatom decomposition. In early May, when a dinoflagellate bloom dominated by Prorocentrum donghaiense occurred, the polyamine concentration decreased from the level seen in late April. The abundant polyamines that decomposed and were released during the diatom bloom in late April may have promoted the growth of P. donghaiense, resulting in its dominance.
