Shreya Gupta
In recent decades, northern fish coastal waters have been observed to be major hotspots for fishbloom. A bottom trawling survey in summer 2021 will investigate the spatial distribution of large fish abundance and biomass in this area. Nemopilema nomuroi, Cyanea spp. and Urmaryidae (undefined species) were identified during the survey. Realized niches for the three most common species (N. nomuroi, Cyanea spp., and A. nomuroi coerulea) were measured using a maximum entropy model (MaxEnt) to describe its spatial distribution pattern. Nemopilema nomurai was used as a representative species to estimate the feeding rate and feeding pressure of large fish on zooplankton. During flowering of N. nomuroi, the potential zooplankton consumption by N. nourai was enormous and exceeded the zooplankton productivity of the area where N. nourai was flowering. Nomurai gathered in this study. For dwarf copepods, reduced absolute and relative abundances were observed in mid-flowering and flowering stations compared to non-flowering stations. The niches of large fish identified in this study and their relationship with zooplankton help us to understand their biogeographic distribution and ecological role in northern China coastal waters under future climate change scenarios.
KeywordsFish bloom; Geographical distribution; Realized niches; Ecological roles
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