Lakes and ponds are important components of mountain ecosystems. Mountain lakes are mainly formed by volcanic craters, landslides and glaciers, which create beautiful alpine and subalpine landscapes and thus attract many tourists and hikers (cover photo). Such aquatic habitats also harbor rich and unique biodiversity including plants, animals, fungi and microbes. In addition to the ecological importance, the geomorphological, hydrological and biogeochemical significance of mountain lakes are also known, as they integrate the upstream watershed processes and influences the natural and human ecosystems located downstream in their embedded catchments. Therefore, lakes are now considered to provide high ecosystem service values in mountainous landscapes. Field sampling in a subalpine mountain lake (Daigaku-numa Pond) located in the Daisetsu-Kogen swamp, Hokkaido, Japan. Lake water and plankton samples were collected from an inflatable boat using samplers. Ecologists have long recognized the strong coupling between terrestrial and aquatic food webs. For example, in small headwater streams...
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