IWC Population Status
The IWC assesses cetacean status by population rather than by species. This is because the majority of species exist in several different areas and groups. Within a single species there may be one population that is feared to be close to extinction and one that is believed to be thriving. A good example of this is the North Pacific gray whale, considered healthy in the eastern North Pacific, but critically endangered in the west.
Within a single whale population, groups are further broken down into ‘stocks.’ Even within a single population some stocks may be healthy whilst others are not. For example, discussions are currently ongoing to decide whether there is cause for concern regarding one/some of the stocks that make up the population of common minke whales in the North Pacific.
In broad terms, the status of a population is assessed by comparing the current population size with its original, undisturbed size, and then predicting its future size based on identified trends and known threats. In the case of cetaceans, the main historical ‘disturbance’ that impacted on population size was whaling activity.
Understanding population status is vital to understanding whether a population is healthy or whether conservation action is required and if so, whether those actions should be considered a priority.