A study on seasonal dynamics of species diversity of fishes in tidal waters of creeks within the mangroves of Yingluo Bay, Guangxi
广西英罗港红树林潮沟鱼类多样性季节动态研究

Based on seasonal investigations by block net in 1999, the dynamics of species diversity of fi-shes in creek tidal waters within mangrove swamps of Yingluo Bay, Guangxi, were studied. Fifty fourspecies of fishes, belonging to 44 genera and 29 families, were recorded. The numbers of species occur-ring in one to four seasons were 27, 8, 11 and 8, respectively. The dominant species in each season wereyery obvious, but the most dominant species differed in different seasons. The most dominant specieswere Clupanodon punctatus in spring, Osteomugil ophuyseni in summer, Ambassis gymnocephalus in au-tumn and Leiognathus ruconius in winter. As to their temperature tolerances, the warm-water species ab-solutely occupied the largest percentage. Numbers of demersal species were greater than other ecologicaltypes. Thirty species in spring, 30 in summer, 26 in autumn, and 22 in winter were captured in thecreek waters. Twenty species were shared between summer and autumn, which was higher than that be-tween any other pairs of seasons. This was also reflected in the similarity index between the two seasons,which reached 55. 6% for the summer-autumn comparison. The indices of richness D, diversity H', andevenness J, were all higher in autumn than in other seasons. Numbers of fish species and the three biodi-versity indices in creek tidal waters were all higher than that in mangrove-fringed tidal waters. The spe-cies diversity of the fish community in these waters was low in comparison with that in tropical mangroveareas.