A global estimate of terrestrial net secondary production of primary consumers

摘要: AIM: Net secondary production (NSP) emerges from the consumption of net primary (NPP) by all heterotrophic organisms. There has been sporadic interest in importance NSP, but no global estimates have produced. Here, we examine NSP and attempt a estimate using contemporary NPP data combined with modern metabolic scaling theory for rates. We distinguish between potential as amount that could be supported NPP, realized remaining after anthropogenic habitat disruption. LOCATION: Global. TIME PERIOD: 2000–2014. METHODS: present model implementing type II functional response rates, wherein search efficiency handling time are calculated based on consumer mass ambient temperature. solve this each 0.05‐decimal‐degree pixel terrestrial biosphere, inputs (MOD17A3) land‐surface temperature (MOD11C3). aggregate within land‐cover classifications (MCD12C1) to obtain cover‐specific NSP. also correct our declines abundance reported Living planet report 2014. RESULTS: is 4.74 Pg C/year globally (95% CI: 3.75–5.75). When population declines, estimated at 2.37 Pg C/year CI: 1.86–2.89), loss 50% rate carbon flux through consumers. MAIN CONCLUSIONS: Our should not viewed last word sufficient suggest consumers similar magnitude many other fluxes crucial cycle. view hypothesis tested suggests deserves significantly more attention Earth systems, macroecology biogeochemical research.