A Study Of The Structure And Diversity Of Fish Community In Nanling Stream,guangdong Province

The Nanling Mountain,Guangdong Province is located in the Tropic of Cancer,and it is the birthplace of the Beijiang River in the Pearl River tributary.This study analyzes the structural characteristics of the fish resources of the forest streams in the Nanling Mountain,Guangdong Province from the perspective of ecology.The management of the fish resources and the biological resources of the forest streams in Nanling Mountain,Guangdong Province The protection of the use of diversity to provide theoretical basis.The species composition,species diversity,community structure and food resources of the fish species in the area were investigated by surveying the fish resources in Nanling,Guangdong Province in 2014 and 2015.The main findings are as follows:1.A total of 3463 fish samples were collected,identified by belonging to 3 orders 8families and 29 genera and 38 species.The results showed that the dominant species in the area were Cyprinidae,including 16 subfamilies of 14 subfamilies,accounting for42% of the total species.The fish in this area can be divided into five floristic complexes,in which the tropical plain complex forms the main body of the fish in the Nanling Mountain,Guangdong Province.The catches were dominated by small fish,with an average tail weight of 27.44 g.2.From the perceptual type,it is mainly in the lower body of fish in the water,from the type of food,omnivorous fish accounted for a large proportion of Guangdong Nanling fish species,followed by phytophagous fish.3.Fish species diversity index was higher,including Simpson,Shannon-Wiener,Margalef index were 0.925,2.944,4.54.The results showed that the species diversity and richness of fish community in Nanling area of Guangdong were higher,the uniformity was lower,the community structure was stable,and the index was higher at300-600 m above sea level.4.The results showed that the fish species in Nanling,Guangdong Province were in moderate disturbance state.Small fish with fast growth and short maturity had the main species of fish species in Nanling,Guangdong Province.5.Guangdong Nanling region is rich in food resources.There are 378 species of phytoplankton,241 species of phytoplankton,of which 6% of phytoplankton species are phytoplankton species,26% of phytoplankton species and 26% of phytoplankton species.12% of the plant species;algae and algae are also distributed but less species.Zooplankton identified a total of four categories,a total of 77 species.To protozoa,31%of the zooplankton species;rotifers and cloves are also distributed,both accounted for25% of the floating species;copepods accounted for at least 19%.A total of 50 species of benthic fauna were found: Vallisneria asiatca,Hydrilla varticillata,Potamogeton malainus,Potamogeton pectinatus,Ruppia rostellata,Najas marina,Najas minor,Nyriopdyllum spicatum,M.verticillatum,Ceratophyllum oryzeiorum.At about 500 meters above sea level,the most abundant food resources.