Paul Johnson, of the University of Washington School of Oceanography, will be speaking on sponge reefs on Wednesday, May 7 at the Orcas Senior Center as part of San Juan Nature Institute’s Orcas Island Spring Lecture Series.

The lecture will take place at 7 p.m.Free, refreshments will be served.

For information, call 378-3646 or go to www.sjnature.org.