In science news this week: Clams and Water Pumping Explain Phytoplankton Decline in San Francisco Estuary:  “A combination of invasive clams and water pumping explains the drastic suppression of phytoplankton in the San Francisco Estuary, according to a study from the University of California, Davis.  Previous studies linked fish declines in the estuary in part to a limited supply of phytoplankton. These tiny microscopic algae make up the base of the food web: Fish eat zooplankton, which eat phytoplankton.  The … Continue reading SCIENCE NEWS: Clams and water pumping explain phytoplankton decline in the Delta; Falling levels of air pollution drove decline in California’s tule fog; One river remains; Mountain glaciers are major contributors to rising seas; and more …