The ephemeral San Felipe Creek in Anza Borrego Desert (A). Samples were collected from the surface of boulders found in the bed of the desiccated creek (C and E). Samples imaged under a dissecting scope (B, D, and F) show characteristic features of stromatolites including endolithic cyanobacteria underneath a layer of calcite (arrows in panels B and D) and multiple laminate layers of organic and inorganic materials (asterisks in panels D and F). DNA was isolated from the stromatolites shown in panels B and E. Our article describing the microbial metagenome of calcareous stromatolite formations in the Anza Borrego desert in California, led by talented NSF REU scholars from Summer 2022/2023 has now been published in the American Society for Microbiology's Resource Announcements. Read the article here!
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Arun Sethuraman
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