Flyjack posts:
Tom Kaye found a diatom on 377's Cooper bill, Georger Id'd it as Asterionella.
Asterionella is common in the Columbia River..
However, Asterionella japonoca is a spring and summer species while Asterionella formosa is a winter species...
So which one is it?
Coulmbia River diatoms...
Plankton:
Phytoplankton communities consist of a diverse assemblage of diatoms and dinoflagellates have seasonally variable standing stocks and productivities. Common winter diatom species include Asterionella Formosa, Melosira islandica, and Thallassionema nitzschoides. Spring and summer assemblages are represented by Chaetoceros compressus, Asterionella japonica, and Rhizoselenia alata. Annual primary productivities range from approximately 200 mgC/m3/hr in spring to less than 5 mgC/m3/hr in winter. (Anderson, 19720)