Small-scale early aggregation of green tide macroalgae observed on the Subei Bank, Yellow Sea

Song Hu; Hong Yang; Jianheng Zhang; Changsheng Chen; Peimin He

doi:10.1016/j.marpolbul.2014.02.001

Small-scale early aggregation of green tide macroalgae observed on the Subei Bank, Yellow Sea

Mar Pollut Bull. 2014 Apr 15;81(1):166-73. doi: 10.1016/j.marpolbul.2014.02.001. Epub 2014 Feb 22.

Authors

Song Hu¹, Hong Yang², Jianheng Zhang³, Changsheng Chen⁴, Peimin He³

Affiliations

¹ International Center for Marine Studies, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China. Electronic address: shu@shou.edu.cn.
² International Center for Marine Studies, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China.
³ College of Fisheries and Life Sciences, Shanghai Ocean University, Shanghai 201306, China.
⁴ 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.

PMID: 24569106
DOI: 10.1016/j.marpolbul.2014.02.001

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.

Keywords: Banded structure; Early aggregation; Green algal bloom; Subei Bank.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

China
Ecosystem*
Eutrophication*
Oceans and Seas*
Seaweed*