While doing field work this morning (18 June 2019), we observed quite a bit of bleached algae in the mid-to-high zone (see below). These seaweeds are usually darker green and brown — the whites and reds are abnormal for these species. [In this photo, much of the white algae in the foreground is Mazzaella sp., while the reddish looking species is Dwarf Rockweed (Pelvetiopsis limitata).]
There has also been a significant die-off of California Mussels (Mytilus californianus). A large percentage of the mussels were open and gaping, some were empty and some still had tissue inside. Here's one example:
We're curious about how widespread this mussel die-off was. If you see large patches of open, gaping, dead mussels in the intertidal zone and you'd be willing to share a photo, I'd be interested in hearing about your observations.