Diversity and Distribution of Duckweed in Kasetsart University, Kamphaeng Saen Campus

Abstract

Aquatic duckweed plants are commonly found in natural freshwater habitats with clear and still water, particularly in warm climates with high sunlight exposure. They grow in clusters, floating on the water surface, and may coexist with other aquatic plants. Duckweeds are characterized by rapid growth and wide dispersal, and their development is influenced by several environmental factors, including nutrient availability, pH, and temperature. Ecologically, duckweeds provide multiple benefits, such as wastewater treatment, animal feed, and potential sources of biofuel. Kasetsart University, Kamphaeng Saen Campus is surrounded by canals and also contains water bodies within the university area. A previous observation found many duckweeds spreading on the water. Therefore, this study aims to record duckweed species and their distribution in Kasetsart University, Kamphaeng Saen Campus. The study focused on the distribution of three genera of duckweeds, namely Spirodela, Lemna, and Wolffia, to establish
a baseline database on their distribution. Field sampling was conducted at five sites during the peak growth period of duckweeds. For each sample, morphological characteristics, species identification, sampling location, and photographic records were documented, followed by an analysis of distribution patterns. The results indicated that Lemna and Wolffia were present at all sampling sites, whereas Spirodela was detected only at certain locations. This variation may be attributed to environmental conditions, habitat diversity, and waterbody size, which influence the occurrence of particular genera. These findings can support further applications of duckweeds in ecological and economic contexts, as well as their potential use as bioindicators.