LME Map

The indicators on this website are sorted three ways: Thematically, Regionally, and as a National Status. The Regional pages are broken down at the "Large Marine Ecosystem" scale, as seen in the figure above.

 

(Click to enlarge)

This website is designed to provide users with an “at-a-glance” view of important ecosystem indicators at the  large marine ecosystem and national scales. Thus, the website is broken into three main sections: Themes, Regions, and National.

 

For users interested in a specific type of indicator, the Themes menu allows you to select and view the indicators that exist within each of the thematic categories: Biological, Climatological, Physical-Chemical, and Human Dimension. Each page displays long-term time series for the indicator at the large marine ecosystem scale as well as gauges and arrows that display the indicator’s recent trends relative to the entire data set. More information can be found on the “Indicator Graphics” tab. Specific information about each indicator as well as plain language descriptions can be found by clicking on any time series graphic. Additionally, users can find more in-depth information about the indicators as well as download the data for themselves using the links in the Additional Resources section.

 

The Regional pages organize information for users interested in a specific area of the U.S. marine ecosystem. Each Regional page contains the same indicator information listed above for all indicators that could be identified for a given region. Regionally-specific resources are listed below, allowing users to identify organizations and data portals that work in their large marine ecosystem of interest. Finally, indicators that have data available for all regions are organized into a National Status that provides long-term time series and trends for a given indicator throughout the entire U.S. marine environment.

 Understanding the Gauge plots

The gauge plots that accompany the indicator time series are meant to reflect the current status of that ecosystem component at the regional or national level. The numerical scores are determined as the percentile rank of the average (mean) value of that indicator over the last five years of the time series, relative to the series as a whole. The values typically represent quantitative score, with more desirable conditions in the darker blue.  Thus, some gauges are "right-handed" with the higher values being in darker blue, whereas other gauges are "left-handed" with lower values being in darker blue (indicating that lower values are preferable). In some instances (e.g. climate measures), the scores represented are unitless and are presented as two-way gauges, indicating that either high or low scores are observed, implying neither higher nor lower values are necessarily preferred.

 

examples of righthand, lefthand, and 2-way gauges

                Lefthand gauge                                          Righthand gauge                                   Two-way gauge

 

Understanding the Time series plots

Time series plots show the changes in each indicator as a function of time, over the period 1980-present. Each plot also shows horizontal lines that indicate the median (middle) value of that indicator, as well as the 10th and 90th percentiles, each calculated for the entire period of measurement. Time series plots were only developed for datasets with at least 10 years of data. Two symbols located to the right of each plot describe how recent values of an indicator compare against the overall series. A black circle indicates whether the indicator values over the last five years are on average above the series 90th percentile (plus sign), below the 10th percentile (minus sign), or between those two values (solid circle). Beneath that an arrow reflects the trend of the indicator over the last five years; an increase or decrease greater than one standard deviation is reflected in upward or downward arrows respectively, while a change of  less than one standard deviation is recorded by a left-right arrow.

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