Analysis of the Basic Characteristics of Red Tide Disasters in the Coastal Seawater of Guangdong Province

Abstract

This paper collected the data on red tide disasters from 2013 to 2022 in the Guangdong Provincial Marine Disaster Bulletin, and comprehensively analyzed the basic characteristics of the spatiotemporal distribution of red tide disasters in the coastal seawater of Guangdong Province in the past ten years by statistical methods, in order to provide a reference for the early warning and prevention of red tide disasters. The analysis results show that a total of 95 red tides occurred in the coastal seawater of Guangdong Province in the past ten years, with an annual average of 9.5 times, the total area of red tides was 3624.76km2, red tide mainly occurrs between January to April, and the average duration of each red tide was 8.8 days. The locations with the highest frequency of red tide was in the coastal seawater of the Pearl River Delta, while the largest area of red tide was occurred in the western Guangdong Sea. There are 26 species of organisms that cause red tides, including 13 species of Bacillariophyta, 10 species of Dinophyta, and 1 species each of Coccolithophore, Xanthophyta and Protozoa, Noctiluca scintillans and Akashiwo sanguinea are the most frequent cause of red tides, and Phaeocystis globosa is the largest area occurrence of red tides, the species that cause red tides have shown a trend of diversification in recent years.

Keywords

• red tide
• basic characteristics
• coastal seawater of guangdong province