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The concept of essential ecosystem service variables (EESVs) is fundamental in understanding the intricate dynamics of ecosystem services provided by mountain and hill ecosystems. These variables are quantifiable biophysical or social indicators that capture the functioning, provisioning, regulating, cultural, and supporting services that ecosystems offer. In the context of mountain ecosystems, EESVs are particularly significant due to the ecological complexity, altitudinal gradients, fragile terrain, and the unique biodiversity these ecosystems host. Moreover, mountain and hill ecosystems provide essential services not only to the people living within them but also to downstream and lowland populations. Mountains cover approximately 22% of the Earth’s land surface and are home to around 13% of the world’s population. These regions also host a wide variety of flora and fauna, many of which are endemic. They function as the planet's water towers, carbon sinks, biodiversity hotspots, and climate regulators. However, due to their vulnerability to climate change, land degradation, deforestation, and unsustainable human interventions, it becomes critical to monitor and evaluate ecosystem services through specific essential variables. Provisioning Services Variables Provisioning services are the products that people obtain from ecosystems. In the mountain and hill context, the primary provisioning services include freshwater, food (such as cereals, fruits, medicinal plants), fuelwood, fodder, and fiber. 1. Water Yield and Flow: One of the most critical provisioning services in mountain regions is the supply of freshwater. Measuring water yield from snowmelt, glaciers, springs, and rivers is an essential ecosystem service variable. Changes in precipitation patterns, glacial ___ ____ ______ __________ _________ ________ _______ _________ _____ ________ ______ _____.
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