title: Small-scale early aggregation of green tide macroalgae observed on the Subei Bank, Yellow Sea.
abstract: Massive green algae blooms became an environmental disaster in the Yellow Sea from 2008 to 2013. Recent studies suggested that recurrences of early aggregates of macroalgae were found over the Subei Bank, a unique shallow radial sand ridge system off the Jiangsu coast, China. Yearly field surveys have been carried out over this bank during the past five years (2009-2013), with an aim at identifying and qualifying the physical-biological mechanism for the early aggregation of algae. Data synthesis showed that early aggregation of macroalgae usually occurred from April-May as small-scale patches either over the intertidal mudflat of the Subei Bank or along local isobaths in the northern coastal area north of the bank. Both hydrographic and current measurements were performed by tracking a narrow patchy area of floating macroalgae (nearly 4 km in length and 5-10 m in width) on April 26, 2013, and the results showed that the algae aggregation was mainly caused by tide-induced convergence. This convergence was produced by the local geometrically controlled interaction of tidal currents with mudflats, which is believed to be a key physical mechanism for the early development of algal blooms in addition to marine ecosystem responses and human aquaculture activities.
authors.affiliation: International Center for Marine Studies, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China. Electronic address: shu@shou.edu.cn.
authors.forename: Song
authors.initials: S
authors.lastname: Hu
authors.affiliation: International Center for Marine Studies, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Yang
authors.affiliation: College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China.
authors.forename: Jianheng
authors.initials: J
authors.lastname: Zhang
authors.affiliation: International Center for Marine Studies, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China; School for Marine Science and Technology, University of Massachusetts-Dartmouth, MA 02744, USA.
authors.forename: Changsheng
authors.initials: C
authors.lastname: Chen
authors.affiliation: College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China.
authors.forename: Peimin
authors.initials: P
authors.lastname: He
mesh_terms: D002681:China; D017753:Ecosystem; D005068:Eutrophication; D009792:Oceans and Seas; D012624:Seaweed
keywords: Banded structure; Early aggregation; Green algal bloom; Subei Bank