Tides of Change: Past Trends…and Prospects for the Future in Rocky Intertidal Communities is a video of a report from Dr. Richard Ambrose discussing the results of studies at about 154 long-term monitoring sites, from Alaska to Mexico, under the auspices of MARINe, some of which have been studied for as long as 30 years.

Of particular interest here, because of their frequent occurrence in my 2014 survey, are Dr. Ambrose’ charts of the fluctuation of Rockweed, Endocladia and barnacle populations in monitored sites over a 20 year period, and the advance, retreat, then recovery of each of these species.

The talk also touches on the withering foot disease of abalone in the 1980s, and of seastar wasting disease starting around 2013, and speculates on changes coming to the rocky intertidal in future years.

The video is at https://www.youtube.com/watch?v=WWb_uIQJ80g.

The talk was sponsored by California’s Cabrillo Marine Aquarium.