But instead of simply passing offshore, increasing numbers are now diverting into San Francisco Bay and lingering for days or even weeks inside the crowded estuary – a shift scientists increasingly link to climate change. Warming temperatures and shifts in sea ice in the Arctic are disrupting the food web gray whales rely on during summer feeding months, according to a 2023 study in Science, leaving many malnourished during migration.
Well, mebbe. Perhaps it is the omnicause. Another view is possible. Given that I’ve between little and no knowledge in this field this is, of course, just rampant speculation from an ignorant.
But what if it’s just that there are more whales?
The effort comes amid an alarming rise in gray whale deaths in the bay. Last year, 21 dead gray whales were found in the wider Bay Area – the highest number in 25 years, according to the Marine Mammal Center – with at least 40% killed by ship strikes. At least 10 more have died in the Bay Area so far this year.
Scientists say those figures probably underestimate the true toll as many whale carcasses sink or are swept back out to sea before they are ever found or reported.
There are indeed many more whales than there used to be. This is good – I do not think that wiping species out is a good idea. But there’s not much natural predation upon live and adult whales. It’s not like wildebeest, where there’s always a lion or five ready to take the one that first stumbles. The natural end of a species without such predation is to die of illness or starvation – as happens to lions in fact, to polar bears. So, if there are more whales around there are more to be hit by ships, more to shelter in SF bay and, yes, we’d expect the marginal member of the species to be malnourished.
Yes, agreed, not hitting them with ships is probably a good idea. But the why there are so many more is because there are so many more.
Thjere is the more general observation that cetacean starndings seem to be rising in number. But then there are more cetaceans – this is good – in general too.
And?