1 Assessing Trends in Abundance for Vaquita using Acoustic Monitoring: Within Refuge Plan and Outside Refuge Research Needs Workshop Report--October 19-23, 2009 Lorenzo Rojas Bracho 1 , Armando Jaramillo Legoretta 1 , Gustavo Cardenas 1 , Edwyna Nieto 1 , Paloma Ladrón de Guevara 1 Barbara Taylor 2 , Jay Barlow 2 , Tim Gerrodette 2 , Annette Henry 2 Nick Tregenza 3 , Rene Swift 4 , Tomonari Akamatsu 5 1 Instituto Nacional de Ecología 2 Southwest Fisheries Science Center, U.S. NOAA Fisheries 3 Chelonia Ltd., 4 St. Andrews University, 5 Fisheries Research Agency of Japan