Multifactor diagnostic chart
This building block helps to identify the factors that threaten sea lion populations with a spatially-explicit, multifactorial approach. The outcome is a set of prescribed actions for each population in the same geographic realm, depending on their diagnostic characteristics, avoiding an “all-purpose” general, possibly ineffective solution.
For each colony or population of sea lions, a set of environmental factors is selected and described with a historical perspective. Examples of relevant factors are: sea temperature, upwelling index, pH, chlorophyll, diet composition of sea lions, microbial load, heavy metals. Next, a group of drivers are identified as influencing the region of interest and for a given year, their influence in factors is determined and qualified. Drivers can be: ENSO, climate change, over-fishing, pollution. The end result could be that only a few or several colonies could be affected, even in the same geographical region or sub-region.
1. Information about population: total number of individuals; numbers of pups; numbers of females, diet information for sea lions, pollution data.
2. Availability of environmental variables. All the time series of environmental variables were fetched from internet specialized public sites.
Because this Building Block requires a fair amount of data, some basic information might not be available. At the end, using a data-poor approach, one has to use a set of available environmental variables, namely temperature, chlorophyll and upwelling.