Canadian Migration Monitoring Network

The results on this page are only showing the population indices for the project "Canadian Migration Monitoring Network". To view population indices from additional projects, you can use this page.

Beaverhill Bird Observatory, AB Bruce Peninsula Bird Observatory, ON Delta Marsh Bird Observatory, MB Haldimand Bird Observatory, ON Inglewood Bird Sanctuary, AB Innis Point Bird Observatory, ON Last Mountain Bird Observatory, SK Lesser Slave Lake Bird Observatory, AB Long Point Bird Observatory, ON Mackenzie Nature Observatory, BC McGill Bird Observatory, QC Observatoire d'oiseaux de Tadoussac, QC Pelee Island Bird Observatory, ON Prince Edward Point Bird Observatory, ON Rocky Point Bird Observatory, BC Thunder Cape Bird Observatory, ON ----------------- Select species ----------------- Season All Fall Spring Earliest year: 19601965197019751980198519901995200020052010 Latest year: 2015201020052000199519901985198019751970 Trend line: LOESS Smooth No trend line

The Population trends tool allows you to display estimated annual indices of population size over time, with an optional loess smoothed trend line, for a selected time period and season (note however that trend is only calculated on the entire sampling period at each site). Plots for multiple locations and species can be displayed at once. You can start by selecting a project, and then one or more area, and one or more species (you can select multiple areas or species by holding the CTRL key), as well as the other optional features. For more information about this tool, click here. How to read the population trend graphs The trend is presented as an estimate of % change per year over the period analyzed. For instance, a trend value of -1.7 % as in our example refers to an estimated loss of 1.7% in the population every year between 1996 and 2014. There is a 95% probability that the true trend falls within the 95% credible intervals shown An * suggests that the posterior probability that the trend falls above zero (for an estimated positive trend) or below zero (for an estimated negative trend) is greater than or equal to 0.95. The annual population index is a relative measure of the population calculated each year, based on the statistical model. Higher values simply indicate a larger estimated population on a given year. The indices are usually first calculated on a logarithmic scale, and sometimes converted to a more understandable unit, such as an average number of individuals counted per hour or per day. A logarithmic scale can easily be identified by the presence of negative annual population indices. The population trajectory (blue line) shows a visualization of the general population trend over time. Depending on which option you selected, you may see no trend line or a LOESS smooth (a regression function that produces a general population trajectory based on the average around a given year).