Impacts of El Niño-Southern Oscillation (Enso) Events on Trophodynamic Structure and Function Around the Taiwan Bank Marine Ecosystem

• DOI: 10.2139/ssrn.4700008
• Publication Date: 2024-01-19T07:21:07Z
• Authors: Po-Yuan Hsiao; Kuo-Wei Lan; Wen-Hao Lee; Cheng-Hsin Liao; Nan-Jay Su; Ting-Yu Liang
• Keywords: Marine ecosystem; Thunnus

Taiwan Bank (TB) is located in the southern Strait (TS), where uplifted continental slope and bottom currents result formation of upwelling areas, which serve as crucial fishing grounds. Climate-induced fluctuations fish populations occur TS. However, how predation competition affect interspecies relationships TB ecosystem warrants clarification. In this study, we collected high-grid resolution data on fishery activity (2013–2019) constructed models by using Ecopath with Ecosim (EwE). Three mass-balanced for influence El Niño–Southern Oscillation (ENSO) events were EwE. Functional groups including representative pelagic, benthic, reef species analyzing relationship between migratory sedentary terms structure variation due to climate change. The results demonstrated that total system throughput (TST) was 10556–11122 t km−2year−1, an average transfer efficiency 12.26%. According keystoneness index calculated through mixed trophic impact analysis, Polydactylus sextarius, Scomber japonicus key top–down control relatively high normal year. keystone also shift predator Thunnus albacares Katsuwonus pelamis during Niño La Niña events, respectively. Moreover, biomass, TST, consumption, respiration noted increase ENSO events. diversity connectance indexes low but pelagic biomass high, whereas most benthic