Spatial-temporal distribution of Lateolabrax japonicus larvae,juveniles and young in Spartina alterniflora salt mash of Rudong
The invasion of Spartina alterniflora seriously affects the diversity and stability of salt marsh ecosystems.Japanese sea bass(L.japonicus)is an economically important species along the coast of China,which is also the dominant species in salt marsh habitats.To understand the effect of S.alterniflora invasion on L.japonicus nursery,a continuous survey was carried out from March 2023 to February 2024 during the spring tide in a tidal flat located in Rudong,Jiangsu Province.A total of 12 sampling sites belonging to four habitats,including tidal creek,mudflat,S.alterniflora salt marsh and artificial pond were designed.The results showed that a total of 2 419 L.japonicus were caught throughout the year,with a total biomass of 18273.20 g.The peak of the population occurred in May and the peak of the biomass presented in June.The catch per unit effort(CPUE)of larvae and juveniles of L.japonicus was comparable between the tidal creek and the artificial ponds,while the CPUE of the young in the artificial ponds was significantly lower than that in the tidal creek.It suggested that the swimming ability gradually strengthened over time,resulting in a more autonomous selection of habitat.Among the four habitats,the priority of habitat utilization was in the order of tidal creek,artificial pond,mudflat and S.alterniflora salt marsh.Thus,it is concluded that the invasion of S.alterniflora has damaged the conservation function of salt marsh habitats for L.japonicus,while micro-topography manipulations facilitate the improvement of its conservation capacity.
万方数据
维普
