Human pressures have been intensely modifying freshwater ecosystems worldwide. Water and Life > Conservation, Management, and AwarenessĪquatic scientists are poised to take advantage of widely available datasets and freely‐available modeling tools to apply the functional information gained through ecosystem metabolism to help inform environmental management.Despite challenges associated with modeling metabolism in rivers and lakes, rapid developments in this field have moved us closer to utilizing real‐time estimates of GPP, ER, and G to improve the assessment and management of environmental change. Finally, we discuss research needed to overcome current conceptual limitations of applying metabolism in management settings. We then review existing data types and provide a short guide for implementing field measurements and modeling of ecosystem metabolic processes using currently available tools. We highlight new applications of diel DO data and metabolism in regulatory settings and explore how they can be applied to managing and monitoring ecosystems. We review the current approaches for using DO data in environmental management with a focus on the United States, but briefly describe management frameworks in Europe and Canada. Benefitting from new instrumental and modeling tools, it is now relatively straightforward to extend routine monitoring of dissolved oxygen (DO) to dynamic measures of aquatic ecosystem function (GPP and ER) and key physical processes such as gas exchange with the atmosphere (G). Historically, several logistical and conceptual factors have limited the widespread application of metabolism in management settings. Aquatic scientists are poised to take advantage of widely available datasets and freely‐available modeling tools to apply functional information gained through ecosystem metabolism to help inform environmental management. Thus, even when the quota on a parent collection is changed, it is not necessarily required to change the quota on every child or descendant collection.Recent advances in high‐frequency environmental sensing and statistical approaches have greatly expanded the breadth of knowledge regarding aquatic ecosystem metabolism-the measurement and interpretation of gross primary productivity (GPP) and ecosystem respiration (ER). This allows the space used by /~milele/public/ to be as large as the quota on /~milele/ allows (depending on the other contents of /~milele/) even if the quota on /~milele/ is changed. For example, the quota on /~milele/ may be 100 MB, but the quota on /~milele/public/ may be unlimited. On some systems where quota is counted by collection and not by user, a quota on a sub-collection may be larger than the quota on the parent collection that contains it.For example a server that implements user-based quotas, DAV:quota-used-bytes usually will be the same for a collection and it's members. Additionally, because there may be a number of distinct but overlapping sets of resources for which a DAV:quota-used-bytes is maintained ( Section 4), there may be no correlation between the size of the resources in a collection and DAV:quota-used-bytes. Since there are many factors that affect the storage used by a set of resources, including automatic compression, the size of associated metadata, and server-inserted content (such as that created by PHP code) in the on-the-wire representation of resources, clients are advised to not depend on the value of DAV:quota-used-bytes being the sum of the DAV:getcontentlength properties for resources contained by a collection. If deleting a resource does not free up any space, the file may have been moved to a "trash" folder or "recycle bin", or retained as in versioning systems ( ).
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