Zooplankton includes 34 species (species) of protozoa, 38 species (species) of rotifers, 26 species (species) of cladocera and 49 species (species) of copepods, totaling 147. Number and biomass of zoobenthos: 198 1 year (individual/m2) 249.1.1981year (g/m2) 29.654, 1982. Subtropical evergreen broad-leaved forest grows without equatorial vegetation, but there are many tropical ones. Although today's natural vegetation has disappeared due to artificial reclamation, tropical tree species, such as Eucalyptus rubra and Aquilaria sinensis, can still be seen in the "feng shui forest" and "miscellaneous forest" around some villages, indicating that the ancient hilly platform is a tropical monsoon rainforest vegetation distribution area. There are also alocasia alopecuroides and plantains in the valley, and shrubs, vines and herbs under the forest are mainly subtropical species, each of which becomes a dominant community. Ficus carica, kapok, Solanaceae, Platanus acerifolia, etc., which are widely distributed today, are also subtropical trees. There are Kandelia candel and Bruguiera gymnorrhiza in mangrove forests in the Pearl River Estuary. There are sword beans, sweet potatoes, date trees, salt-tolerant plants, such as mouse reeds. Shanghai beach, distributed in Dongguan, Baoan, Shenzhen and Zhuhai. According to 65438+.
There are more than 500 species in the delta, which also reflect the subtropical characteristics, belonging to 130 families and 373 genera (Chen Shupei, 1984), of which pure tropical genera account for 42% and even pantropical genera account for 53%. Tropical genera account for 62% and tropical species account for 56% in Dinghushan area, namely 129 1 species. Among the genera of Luofushan 146, the pantropical genus accounts for 9 1% (Zheng Zhiqing, 1987). Evergreen vegetation in monsoon forest is mostly geomantic forest and miscellaneous forest, mostly secondary, which is mainly subtropical flora (Wang Zhuhao, 1982) with a small area. Most of the hills on the platform are evergreen shrubs. Grass slope with tropical elements is prone to soil erosion because it grows on latosol soil layer. Insect-eating plants such as Nepenthes are subtropical plants. The ecological characteristics of subtropical plants are also fully reflected in common cultivated trees, such as banyan, air root and column root, which can form a forest independently; Flowering on the old stems can be seen in carambola and pineapple. Annual flowers are found in Prynne and Hibiscus; The leaves of pliers exist in mangoes; Rotting leaves exist in mangoes and lychees; Drip-pointed leaves are found in bodhi trees. The ecological characteristics of these subtropical plants are consistent with the distribution area of subtropical monsoon rain forest here. Among them, Aquilaria sinensis (Aquilaria sinensis) was widely planted in Dongguan County in the Ming Dynasty and became a famous product in Dongguan, known as "Vientiane". This shows that the Pearl River Delta is a subtropical delta. △9 Cities: Guangzhou, Shenzhen, Foshan, Zhaoqing, Huizhou, Zhuhai, Jiangmen, Dongguan and Zhongshan. This is a water network area, dominated by swamps, depressions and low-lying forests, so there are also many typical subtropical giant animals, which also reflects the original subtropical characteristics of the delta. Such as Asian elephants, Malay crocodiles, peacocks, etc. There are many descriptions in ancient books, even with fossils as evidence. For example, during the Three Kingdoms period, crocodiles were still growing in Guangzhou. Water mirror Nott said: "The giant crocodile is a rare and strange thing, there are thousands of kinds, I can't remember." Today, Pingzhou fishermen also extracted crocodile skulls from the river, indicating that there are crocodiles in Guangzhou. Another crocodile skeleton was unearthed in Shunde and Xinhui. Dalin (Tangxia) 14C is 3020 80 years, and Liu Le is 2540105 years. There are also records of elephants harming crops in Nanhan, Dongguan. The author once collected the tibia of an elephant in the mud layer of Guxihu District, Guangzhou. The Annals of the South China Sea (Yuan Dynasty) still records the existence of elephants. There are records of Peacock in Kaiping in Jin Dynasty and Xinhui in Tang Dynasty. It can be seen that the Pearl River Delta has been a place where tropical animals are distributed since ancient times, in which ivory is hunted and used as a commodity. The Tang Dynasty's "North Household Record" contains: "The teeth are small and red, comparable to cutting, not inferior to imported ones." Crocodiles are recorded as eating people and animals, which is very different from Chinese alligators in the Yangtze River, and is consistent with porous crocodiles and crocodiles. In today's Nanyang Islands. Elephants are Asian elephants. Today, due to the continuous development of the delta, the increase of population and the destruction of trees, they have been hunted to death.
The main economic fish are shad, silver carp, silver carp, silver carp, eel, flower eel, herring, grass carp, mandarin fish, red-eyed trout, Hainan red squid and big-eyed squid. Guangdong, Hong Kong and Macao metropolitan areas are respectively composed of abbreviations of Guangdong, Hong Kong and Macao, and the so-called "Greater Pearl River Delta" is "Guangdong, Hong Kong and Macao". 9 cities including Guangzhou, Shenzhen, Foshan, Zhaoqing, Huizhou, Zhuhai, Jiangmen, Dongguan and Zhongshan. It is decided to propose "building a high-quality living circle in the Greater Pearl River Delta" and "building the most dynamic and internationally competitive urban agglomeration in the Asia-Pacific region" to build the core metropolitan areas of Shenzhen, Hong Kong, Guangzhou and Zhuhai. Guangzhou, Shenzhen, Foshan, Zhaoqing, Huizhou, Zhuhai, Jiangmen, Dongguan and Zhongshan are mentioned in the Opinions. Promote the cooperation between Guangdong, Hong Kong and Macao from the aspects of urban planning and financial services, speed up the construction of world-class urban agglomerations, and build a greater Pearl River Delta urban agglomeration region with international competitiveness. By 20 12, Guangdong, Hong Kong and Macao will strive to form one of the most core competitive metropolitan areas in the world and promote the cooperation between Guangdong, Hong Kong and Macao to build a world-class urban agglomeration. Today, Guangdong, Hong Kong and Macao metropolitan area has surpassed London metropolitan area and become the third largest metropolitan area in the world.