Accounting for variation in temperature and oxygen availability when quantifying marine ecosystem metabolism

Given human modification of Earth’s ecosystems, it is essential to understand how these changes are influencing ecosystem functioning, including net and gross community production and community respiration. These responses are often estimated by measuring oxygen production in the light (net community production) and consumption in the dark (community respiration). These values can then be combined to estimate gross community production. However, the method used to create “dark” conditions – either experimental darkening during the day or conducting measurements at night – could result in different estimates of respiration and production. These data were used to test this prediction and include measurements of oxygen concentrations under daytime “ambient” light conditions, in darkened tide pools during the day, and during nighttime low tides. We made measurements every 1-3 months over one year in southeastern Alaska. We found that daytime respiration rates were substantially higher than ...鉴于人类活动对地球生态系统的改造，阐明此类变化如何影响生态系统功能至关重要，相关研究需涵盖群落净生产力（net community production）、群落总生产力（gross community production）以及群落呼吸作用（community respiration）这几项核心指标。这类生态响应通常可通过测定光照条件下的氧气释放量（即净群落生产力）与黑暗条件下的氧气消耗量（即群落呼吸作用）来估算。将上述两项数值结合后，即可推算得到群落总生产力。然而，用于营造“黑暗”实验环境的两种主流手段——日间实施实验遮光或于夜间开展测量——可能会导致呼吸作用与生产力的估算结果产生显著差异。本数据集即用于验证这一推测，其中包含日间“环境光照（ambient light）”条件下、日间遮光潮池内以及夜间低潮时段的氧气浓度测定数据。研究团队于阿拉斯加东南部开展了为期一年的野外观测，每1至3个月进行一次数据采集。研究发现，日间群落呼吸速率显著高于……