The Role of Fog in the Ecohydrology and Biogeochemistry of the Namib Desert

A key finding from the Namib Sand Sea study reveals that Welwitschia mirabilis, a long-lived gymnosperm and national symbol, does not rely on fog water for survival despite its hyper-arid environment. Stable isotope analysis of fog, groundwater, plant water, and soil water (2007–2009) showed that W. mirabilis exhibits a depleted water isotope signal similar to plants in the Kuiseb River, contradicting the long-held belief that it thrives on fog. This challenges assumptions about its survival strategy and underscores its potential vulnerability to mining activities. The study also highlights regional variations in carbon (δ13C) and nitrogen (δ15N) isotopes, suggesting microhabitat influences on photosynthesis and nutrient cycling. Methods included isotopic analysis of water and plant material, providing novel insights into the ecohydrology and biogeochemistry of this UNESCO World Heritage Site.

Soderberg, K. S. (2010). The Role of Fog in the Ecohydrology and Biogeochemistry of the Namib Desert [University of Virginia]. https://doi.org/10.18130/V3KZ88