This really isn’t a Transient/Resident issue but rather two families of Residents both of which are fish eaters,one of which is doing well, the other not.The SRKW are literally swimming through schools of salmon in order to return to former fishing areas where there is less abundance, more noise and more pollution. This makes no sense given we equate the Whales with superior intelligence, surely they can figure out after several years (or sooner)that things have changed. Think about it, they pass through a quiet area at the mouth of Juan de Fuca, where there is little competition for the salmon they eat and in fact this area would be where the highest abundance of salmon is.They continue to head towards the approaches of the Fraser, where these same salmon numbers have significantly declined,some have now turned south to Puget Sound and some caught by fishermen, many by seals,so clearly less abundant.
Any animal that forages is hardwired to move on when there is no longer a food source in a specific area, hence the great migrations. I just don’t believe Orcas ,who, although called Resident, are actually quite mobile, can’t figure out,what even a cow could. I personally believe we are selling these whales short and feel the refuges are more based on trying to keep the whales within viewing range than on their well being . Are we encouraging them to exist in areas of high vessel traffic and pollutants for selfish reasons?