Latitudinal distribution of microbial communities in anaerobic biological stabilization ponds: effect of the mean annual temperature

Summary Considering wide utilization and high methane fluxes from anaerobic biological stabilization ponds ( ABSP s), understanding the methanogenesis in ABSP s is of fundamental importance. Here we investigated the variation and impact factors of methanogenesis in seven ABSP s that spanned from the north to the south of China. Results showed that methanogen abundance (7.7 × 10 9 –8.7 × 10 10 copies g −1 dry sediment) and methanogenic activities (2.2–21.2 μmol CH 4 g −1 dry sediment h −1 ) were considerable for all sediments. Statistical analysis demonstrated that compared with other factors (ammonium, pH , COD and TOC ), mean annual temperature ( MAT ) showed the lowest P value and thus was the most important influencing factor for the methanogenic process. Besides, with the increasing MAT , methanogenic activity was enhanced mainly due to the shift of the dominant methanogenic pathway from acetoclastic (49.8–70.7%) in low MAT areas to hydrogenotrophic (42.0–54.6%) in high MAT areas. This shift of methanogenic pathway was also paralleled with changes in composition of bacterial communities. These results suggested that future global warming may reshape the composition of methanogen communities and lead to an increasing methane emission from ABSP s. Therefore, further research is urgently needed to globally estimate methane emissions from ABSP s and re‐examine the role of ABSP s in wastewater treatment.