Distribution characteristics of seagrass,algae,and attached organisms in the seagrass beds of Changshan Islands,Dalian
Seagrass beds not only provide ecological services such as biological habitat,water purification,carbon sequestration,and climate regulation,but also are internationally recognised as one of the"blue carbon"ecosystems due to their large carbon sequestration,high carbon sequestration efficiency,and long carbon storage cycle.In order to investigate the ecological characteristics,biological communities and regional differences of seagrass beds in Changshan Islands,Dalian City,a survey was conducted in August 2022 on the ecosystems of eight seagrass beds in Changshan Islands.A total of 54 survey stations were deployed,and the ecological survey determined the seagrass species composition,distribution area,ecological characteristics,and relevant information on macroalgae and attached animals in the region,while the characteristics of attached animal communities were analyzed by Shannon-Wiener diversity index(H'),Pielou homogeneity index(J),and K-means clustering.The results showed that the distribution of seagrass beds in Changshan Islands was characterized by a wide area and uneven distribution.Three species of Zostera marina,Z.caespitosa,and Z.japonica were distributed around Guanglu Island,Dachangshan Island,Zhangzi Island and Saili Island.The seagrass beds around Shicheng Island and Haxian Island showed a single species of seagrass,only Zostera marina.The area of seagrass beds was the largest around Xiaochangshan Island and it was the smallest for Haiyang Island.In addition to the distributed seagrasses in the survey area,Ulva pertusa,a macroalga,was found to be absolutely dominant in all seven survey areas except for Shicheng Island.The mean value(H')of large-attached organisms in each survey subarea was 0.88,and the mean value of J was 0.27.Overall,H'and J of large-attached organisms were at a low level in the seagrass beds of survey areas.In the seagrass beds of Changshan Islands,27 species of large attached organisms from 5 classes were collected,among which the largest number of species of large attached organisms appeared in the seagrass beds of Xiaochangshan Island,and the attached organism with the largest biomass and average biodensity in the rest of the islands was Homalopoma amussitatum.It is recommended to continuously investigate and observe the dynamic changes of seagrass beds in order to provide reference data for exploring the successional mechanism of seagrass beds in Dalian Changshan Islands,a typical seagrass bed ecosystem in northern China.
万方数据
维普
