Publications
Why Plants Harbor Complex Endophytic Fungal Communities: Insights From Perennial Bunchgrass Stipagrostis sabulicola in the Namib Sand Sea
Researchers have uncovered that perennial plants, such as the Namib Sand Sea's Stipagrostis sabulicola, harbor complex endophytic fungal communities primarily composed of latent saprophytes. These fungi, dormant within living plants, play a crucial role in nutrient recycling by initiating decomposition of standing litter shortly after senescence, often triggered by non-rainfall moisture events like fog or dew. Through laboratory and field experiments, the study demonstrated that tillers with endophytes decomposed twice as fast as sterilized ones, with 59–70% of the fungal community comprising these dual-niche saprophytes. This finding provides a plausible explanation for why plants tolerate complex endophyte communities, highlighting their role in maximizing nutrient recycling and contributing to the nutrient island effect in drylands.
Non-Rainfall Moisture Activates Fungal Decomposition of Surface Litter in the Namib Sand Sea
A mesophilic Ascomycete fungal community plays a crucial role in the decomposition of surface litter in the hyper-arid Namib Sand Sea, despite minimal rainfall (0-17 mm annually). These fungi respond rapidly to non-rainfall moisture sources like fog and dew, which occur every 3 days on average. Key traits enabling their survival include darkly-pigmented hyphae, a broad thermal range including low temperatures during fog events, and resilience to extreme desiccation and UV radiation (up to 50°C for five hours). The fungi significantly reduce the carbon-to-nitrogen (C/N) ratio of litter, making it more palatable for detritivores like termites. This discovery challenges the long-held assumption that detritivores alone drive decomposition in this ecosystem and underscores the importance of fungal activity in energy flow and biogeochemical cycling, with potential implications for climate change impacts on precipitation, dew, and fog regimes.
Morphometric analysis of aeolian bedforms in the Namib Sand Sea using ASTER data
A morphometric analysis of aeolian bedforms in the Namib Sand Sea, leveraging the ASTER Global Digital Elevation Model (GDEM), reveals that relationships between dune height, spacing, and equivalent sand thickness are broadly consistent with prior field-based studies. Despite the 30-meter spatial resolution of GDEM data, which underestimates dune height due to crest smoothing and omits smaller dunes, the study confirms established patterns while adding finer details. The research highlights the utility of GDEM for large-scale morphometric analysis, offering new insights into the dynamics of this UNESCO World Heritage Site.
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