Ecosystem metabolism of freshwater ecosystems has been studied for several decades, with theory and synthesis largely derived from temperate streams and rivers in North America and Europe. Advances in sensor technology and modeling have opened a wider range of streams to be included to test theories beyond temperate streams. In this paper, we review and synthesize ecosystem metabolism data from tropical streams and rivers to determine to what extent the constraints of metabolism measured in temperate streams are similar in tropical streams. We compiled 202 measurements of gross primary productivity (GPP) and ecosystem respiration (ER) from 83 tropical streams spanning 22.2°S to 18.4°N. Overall, tropical streams were heterotrophic (ER > GPP), with GPP ranging from 0.01 to 11.7 g O₂ m⁻² d⁻¹ and ER ranging from −0.2 to −42.1 g O₂ m⁻² d⁻¹, similar on average to rates reviewed from temperate streams, but with higher maximum ER in tropical streams. Gross primary productivity increased with watershed area; a result also observed in temperate streams. ER decreased with elevated phosphorus and higher annual rainfall. We constructed a structural equation model that explained greater variation of ER (74%) than GPP (26%), and reflects similar drivers, such as land-use and watershed area, as in temperate streams. We conclude that tropical stream ecosystem metabolism has similar drivers as temperate streams, and a warmer and wetter climate and human use of tropical lands will influence metabolic rates in streams.

中文翻译：

---

热带溪流中的生态系统新陈代谢：综述与综合

淡水生态系统的生态系统代谢已经研究了数十年，其理论和合成方法主要来自北美和欧洲的温带河流和河流。传感器技术和建模技术的进步已经开放了更多的流，其中包括温带流以外的测试理论。在本文中，我们回顾并综合了热带河流和河流的生态系统代谢数据，以确定在温带河流中测量的代谢限制在多大程度上与热带河流相似。我们对跨越22.2°S到18.4°N的83条热带河流的202项基本总生产力（GPP）和生态系统呼吸（ER）进行了测量。总体而言，热带流是异养的（ER> GPP），GPP范围为0.01至11.7 g O ₂ m ^-2d ^-1和ER在-0.2至-42.1 g O ₂ m ^-2 d ^-1范围内，平均与温带水流测得的速率相似，但热带流中的最大ER较高。总初级生产力随着流域面积的增加而增加；在温带溪流中也观察到结果。ER随磷含量升高和年降水量增加而降低。我们构建了一个结构方程模型，该模型解释了ER（74％）比GPP（26％）更大的变化，并反映了类似的驱动因素，例如温带河流中的土地利用和集水区。我们得出的结论是，热带河流生态系统的新陈代谢与温带河流具有相似的驱动力，而且气候变暖和潮湿以及人类对热带土地的利用将影响河流的新陈代谢速率。