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A global estimate of terrestrial net secondary production of primary consumers
Global Ecology and Biogeography ( IF 6.4 ) Pub Date : 2019-09-17 , DOI: 10.1111/geb.12989
Garrett M. Street 1, 2 , Gordon G. McNickle 3, 4
Affiliation  

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

中文翻译:

初级消费者陆地净二次生产的全球估计

目标:净二次生产 (NSP) 来自所有异养生物对净初级生产 (NPP) 的消耗。人们对 NSP 的重要性有零星的兴趣,但没有产生全球估计。在这里,我们检查 NSP 并尝试使用当代 NPP 数据结合现代代谢标度理论对消费率进行全球估计。我们将潜在的 NSP(作为 NPP 可以支持的二次生产的数量)和已实现的 NSP(作为人为栖息地破坏后剩余的数量)进行区分。地点:全球。时间段:2000-2014。方法:我们提出了 NSP 的代谢模型,实现了消费率的 II 类功能响应,其中搜索效率和处理时间是根据消费者质量和环境温度计算的。我们使用 NPP (MOD17A3) 和地表温度 (MOD11C3) 作为数据输入,为全球陆地生物圈中的每个 0.05 度像素求解该模型。我们汇总了全球土地覆盖分类 (MCD12C1) 中的估计值,以获得 NSP 的特定覆盖和全球估计值。我们还根据《2014 年地球生命力报告》中报告的消费者丰度下降更正了我们的估计。 结果:我们估计全球潜在 NSP 为 4.74 Pg C/年(95% CI:3.75–5.75)。当我们校正全球消费者人口下降时,实现的 NSP 估计为 2.37 Pg C/年(95% CI:1.86–2.89),通过二级消费者的碳通量率损失 50%。主要结论:我们的估计不应被视为 NSP 的最终结论,但足以表明通过消费者的碳通量与对全球碳循环至关重要的许多其他通量具有相似的幅度。我们认为这是一个有待检验的假设,表明 NSP 在地球系统、宏观生态学和生物地球化学研究中值得更多关注。
更新日期:2019-09-17
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