SANTA CRUZ, California, Dec. 22 -- The University of California Santa Cruz campus issued the following news: * * * New study finds fishing-fleet movements can reveal marine-ecosystem shifts * Key takeaways * This study introduces the concept of fishing fleets as "ecosystem sentinels," which are living sensors that indicate changing conditions in a natural habitat. * Researchers found that near-real-time data from the global Vessel Monitoring System can detect climate-driven ecosystem disru  more