Seasonal hydrologic and geologic forcing drive hot spring geochemistry and microbial biodiversity
Seasonal hydrologic and geologic forcing drive hot spring geochemistry and microbial biodiversity
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DOI：
10.1111/1462-2920.15617
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发表时间：
2021-06-10
影响因子：
5.1
通讯作者：
Boyd, Eric S.
中科院分区：
文献类型：
--
作者：
Colman, Daniel R.;Lindsay, Melody R.;Boyd, Eric S.
温泉综合了在短期和长期时间尺度上变化的水文和地质过程。然而，时间水文和地质变化对温泉生物多样性的影响是未知的。在这里，我们协调近每周，跨季节（类似于140天）的地球化学和微生物群落分析的三个广泛研究的温泉与当地的降水数据在黄石国家公园。一个春天（“HFS”）表现出统计上显着的，耦合微生物和地球化学的变化与最近的降水模式在整个季节。另外两个春季社区，“CP”和“DS”，表现出最小的跨季节变化。泉水季节性响应的变化是由于降水氧化近地表水对含水层补给的时间和程度不同。这种氧化水的流入与群落组成的变化有关，特别是，可以酸化沃茨的好氧硫化物/硫氧化剂的丰度。在采样过程中，一个新的泉形成后，一段时间的强降水和其演替动态也受到地表水补给。总的来说，这些结果表明，与降水相关的短期水文变化会影响温泉地球化学和微生物生物多样性。这些结果表明，某些温泉及其生物多样性对持续、长期水文变化的潜在敏感性。
Hot springs integrate hydrologic and geologic processes that vary over short- and long-term time scales. However, the influence of temporal hydrologic and geologic change on hot spring biodiversity is unknown. Here, we coordinated near-weekly, cross-seasonal (similar to 140 days) geochemical and microbial community analyses of three widely studied hot springs with local precipitation data in Yellowstone National Park. One spring ('HFS') exhibited statistically significant, coupled microbial and geochemical variation across seasons that was associated with recent precipitation patterns. Two other spring communities, 'CP' and 'DS', exhibited minimal to no variation across seasons. Variability in the seasonal response of springs is attributed to differences in the timing and extent of aquifer recharge with oxidized near-surface water from precipitation. This influx of oxidized water is associated with changes in community composition, and in particular, the abundances of aerobic sulfide-/sulfur-oxidizers that can acidify waters. During sampling, a new spring formed after a period of heavy precipitation and its successional dynamics were also influenced by surface water recharge. Collectively, these results indicate that changes in short-term hydrology associated with precipitation can impact hot spring geochemistry and microbial biodiversity. These results point to potential susceptibility of certain hot springs and their biodiversity to sustained, longer-term hydrologic changes.