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Submerged macrophytes play a structuring role in the shallow freshwater ecosystem by increasing the heterogeneous state in freshwaters. The macrophytes in genus  Ottelia  were featured for their broad leaves, which might consequently produce specialized functions that differed from other submerged species. To explore the potential ecological role of  Ottelia , a field investigation was conducted on leaf traits in eight populations of  Ottelia  ranging from the southwestern Yunnan–Guizhou plateau to the southern Hainan island in China covering a distance of >1,700 km. The eight populations included all the extant  Ottelia  species and varieties in China except the well-documented  O. alismoides . Carbon-related traits [bicarbonate usage, photosynthetic characteristics, capability of Crassulacean acid metabolism (CAM)], pigment content and parameters of chlorophyll fluorescence, morphology and mass of the leaves were determined. The different populations showed distinct functional traits of mature leaves;  O. acuminata  var.  songmingensis  had the thickest and longest leaf with CaCO 3  precipitation on the both sides of the leaf, and  O. cordata  showed putative CAM activity with the highest diel acidity changes 12.5 μequiv g -1  FW. Our results indicated an important role of  Ottelia  populations in carbon cycling as the dominant species in karst freshwaters in China.

The Analysis of Leaf Traits of Eight Ottelia Populations and Their Potential Ecosystem Functions in Karst Freshwaters in China