Monitoring
Natural resource monitoring is another form of assessment that provides land managers with information essential to making well-informed management decisions. Monitoring can play a vital role in invasive plant management and prevention—it provides the justification and knowledge needed for evaluating management actions, and adjusting them if necessary, to reach invasive plant management objectives and sustainable land management goals more effectively and efficiently.
The USFWS defines monitoring as a survey repeated through time to determine changes in the status and demographics of abiotic resources, species, habitats, or ecological communities (701 FW 2 Policy on Inventory and Monitoring).
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The terms monitoring and inventory/survey are sometimes used interchangeably but they have specific purposes. Elzinga et al. (1998) make the following useful distinction:
“Inventory can be described as a point-in-time measurement of the resource . . . Information collected during an inventory may provide a baseline, or the first measurement, for a monitoring study. Often, however, the necessary type and intensity of monitoring will not be known until the inventory is completed. The information collected during inventory, while useful for the development of a monitoring study, may not be useful for monitoring itself.”
Monitoring
- is conducted on a regular or systematic basis
- follows the trend over time of an indicator or variable of the resource compared to predetermined management objectives
- involves collecting data by sampling or on the entire resource if financially and logistically feasible
Monitoring can play an essential role in managing invasive plants—it provides nonbiased information to make well-informed management decisions. As discussed in the Planning module, monitoring is a key component when employing an Adaptive Management framework. Monitoring results can be used to demonstrate where management actions (e.g., control treatments) are effectively and successfully meeting invasive plant management objectives, and to more quickly detect and modify actions that are ineffective.
For example, if an invasive plant management objective is to determine the effectiveness of a chemical herbicide and prescribed burning treatment in reducing stem density by 35%, a monitoring protocol or plan could be developed to measure the treatment’s effectiveness. If monitoring results indicate that the objective (reduction in stem density) is not being achieved, the management or treatment would be adjusted appropriately and monitoring would again be implemented.
In some management situations, formal monitoring may not be necessary when the outcome of an action is well known (Williams et al. 2007).
Monitoring can also be used to
- detect new populations
- determine the status and temporal trends in population sizes and distributions over time (e.g., evaluate invasiveness)
- determine effects of invasive plant species on biota and processes of the ecosystem
- measure success of restoration and revegetation projects
- measure success of best management practices (e.g., during road and building construction, fire-fighting, etc.) that are meant to prevent the introduction and spread of invasive plants into and throughout a management area
The type of monitoring to implement in a management program will depend upon the management strategy (i.e., prevention, early detection, control, restoration). Below, four types of invasive plant monitoring are described and examples of agency and university projects are provided.
1. Monitoring for Early Detection
Purpose
Early detection monitoring is implemented before unwanted species have arrived in an area. It is the most cost-effective monitoring because when rapid eradication takes place, control efforts are minimal.
Description
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Considerations
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Example
Early Detection of Target Populations |
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2. Monitoring for the Effect of Management Actions on Target Invasive Plants
Purpose
Monitoring the effects of management actions (i.e., a control treatment) on the target invasive plant populations is implemented unless the effects of that management action are already well understood and predictable. Such monitoring helps determine the most effective control method.
Description
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Considerations
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Example
Monitoring Effect of Herbicide Treatments on Perennial Pepperweed |
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Monitoring Effect of Treatments on Prioritized Noxious Weeds |
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3. Monitoring for the Effect of Management Actions on Nontarget Species and the Environment
Purpose
Monitoring for the effect of management actions on nontarget species and the environment is ideally employed when management actions are being implemented. Given time and money considerations, this type of monitoring can be used when it is suspected that native species or ecological processes may be negatively impacted. It can also help determine whether it is better to leave the invasive plant species untreated rather than risk damage to the ecosystem.
Description
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Considerations
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Example
Effect of Management Treatments on Native Plant Species |
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4. Monitoring for the Status and Trends of Target Species Populations
Purpose
The current status and trends of target species populations can be monitored when management actions are not being implemented. Such monitoring determines when a threshold has been reached for a particular population, and at which point a management action may begin (e.g., if species is increasing) or end (e.g., if species is decreasing).
Description
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Considerations
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Example
Evaluating and Monitoring Invasive Plant Processes |
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When a decision is made to implement monitoring in an invasive plant management program on a refuge, a monitoring plan (or protocol) is developed. This plan may be integrated into larger planning documents. Like any planning document, a monitoring plan provides the blueprint to reach invasive plant management objectives and facilitates continuity in the program from implementation, to evaluation, to adapting management if needed.
Developing a monitoring plan generally occurs after an inventory/survey of the management area is conducted, threats to high-value ecological sites/resources are identified, target plant species or populations are prioritized, and invasive plant management objectives are developed. Collectively, this information provides the foundation from which the plan is developed.
Invasive Plant Monitoring
In a management plan:
- San Pablo Bay NWR Lepidium latifolium Control Plan (3 MB PDF)
- Noxious Weed Monitoring at the US Air Force Academy - Year 1 Results (5.7 MB PDF)
Stand alone plan:
Elements of a monitoring plan include
- statement of problem and invasive plant management objectives
- monitoring objectives for target species (level of accuracy and precision)
- sampling design (to achieve monitoring objectives)
- field sampling methods
- data management and analyses
- evaluation of monitoring results in achieving invasive plant management objectives
- adjustment of management actions or invasive plant management objectives if needed
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