2012 Assessment of Near Shore Marine Resources at Farallon De Medinilla, Commonwealth of the Northern Marina
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SITE SPECIFIC REPORT SSR-NAVFAC-EXWC-EV-1307 APRIL 2013 CALENDAR YEAR 2012 ASSESSMENT OF NEAR SHORE MARINE RESOURCES AT FARALLON DE MEDINILLA, COMMONWEALTH OF THE NORTHERN MARIANA ISLANDS By Stephen H. Smith Donald E. Marx Jr. Lee H. Shannon Distribution authorized to U.S. Government agencies and their contractors; Administrative/Operational Use; April 2013. Other requests for this document shall be referred to NAVFAC EXWC or NAVFAC PAC. Printed on recycled paper This page is intentionally left blank. REPORT DOCUMENTATION PAGE (SF 298) Form Approved OMB No. 0704-0811 The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information, it if does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 3. DATES COVERED (From – To) APRIL 2013 Site Specific Report 6-12 August 2012 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER CALENDAR YEAR 2012 ASSESSMENT OF NEAR SHORE MARINE RESOURCES AT FARALLON DE MEDINILLA, 5b. GRANT NUMBER COMMONWEALTH OF THE NORTHERN MARIANA ISLANDS 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER Stephen H. Smith 16940-57-001001 Donald E. Marx Jr. 5e. TASK NUMBER Lee H. Shannon 5f. WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESSES 8. PERFORMING ORGANIZATION REPORT NUMBER NAVFAC-EXWC SDS SSR-NAVFAC-EXWC-EV-1307 1100 23rd Ave Port Hueneme, CA 93043 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITORS ACRONYM(S) PACIFIC FLEET ENVIRONMENTAL PAC FLT 11. SPONSOR/MONITOR’S REPORT NUMBER(S) N/A 12. DISTRIBUTION/AVAILABILITY STATEMENT Distribution authorized to U.S. Government agencies and their contractors; Administrative/Operational Use; April 2013. Other requests for this document shall be referred to NAVFAC EXWC or PAC FLT. 13. SUPPLEMENTARY NOTES 14. ABSTRACT. Farallon De Medinilla (FDM) is an uninhabited island in the Mariana Archipelago; it has been used by DoD as a live and inert range since 1971. As a result of the NMFS Biological Opinion (1998) and subsequent agreements, the Navy has conducted annual marine ecological surveys of the near shore marine resources from 1999 through 2012 (except for 2011). NAVFAC EXWC Scientific Diving Services with support from EOD Detachment Marianas has performed all the surveys since 2004. Although minor impacts have been detected, which could be clearly associated with military training, no significant or substantial impacts to the physical or biological environment have been detected between 1999 and 2012. This conclusion is based on four criteria: 1) very few areas of disturbance have been detected, 2) most of the disturbed areas have been in natural rubble environments, 3) the size of the disturbed areas were generally less than 2 sq. m and 4) substantial or complete recovery has occurred within one year. The restricted access to FDM has resulted in a de-facto preserve effect, with the result that marine natural resources at FDM are comparable to or superior to those any of the other islands within the Mariana Archipelago. There was strong evidence during the 2012 survey that FDM has become subject to commercial spear fishing; this has resulted in changes to the numbers and behavior of some key fishery target species. An infestation of coral barnacles was observed in 2012, but this is not related to training activities. The greatest threat to FDM’s marine resources is overfishing. 15. SUBJECT TERMS Farallon De Medinilla live fire range, De-Facto Marine Protected Area 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF 18.NUMBER OF 19a. NAME OF RESPONSIBLE PERSON ABSTRACT PAGES a. REPORT b. ABSTRACT c. THIS PAGE Stephen H. Smith U U U Unlimited 108 19b. TELEPHONE NUMBER (include area code) (808) 472-1405 iii This page is intentionally left blank. iv EXECUTIVE SUMMARY Farallon De Medinilla (FDM) is an uninhabited island in the Mariana Archipelago. The island is approximately 1.6 kilometers (km) long and is located 278 km north of Guam. FDM has been used by the Department of Defense (DoD) as a live and inert range since 1971. Under the direction of the U.S. Pacific Fleet, the Navy has conducted 13 annual marine ecological surveys of near shore marine resources at FDM between 1999 and 2012 (no survey was performed in 2011). The 1999 – 2004 surveys were completed by a Navy contractor and a representative from the U.S. Fish and Wildlife Service, the National Marine Fisheries Service and the Commonwealth of the Northern Mariana Islands. All surveys since 2004 have been performed by the Naval Facilities Engineering and Expeditionary Warfare Center’s Scientific Diving Services (SDS). Explosive Ordnance Disposal Detachment Marianas provided oversight for all surveys. This report presents the findings of the calendar year 2012 survey and compares those findings with the previous 12 surveys. Although minor ecological impacts, which could be attributed to military training, were detected in 2012 and previous surveys, no significant or substantial impacts to the physical or biological environment have been detected between 1999 and 2012. This conclusion was reached by all the investigators (1999 – 2012) and was based upon four criteria: 1) very few areas of disturbance have been detected, 2) most of the disturbed areas have been located in natural rubble environments, 3) the size of the disturbed areas were generally less than 2 m2 and, 4) substantial or complete recovery has occurred within one year. The restricted access to FDM has resulted in a de-facto preserve effect. The marine natural resources at FDM are comparable to or superior to those of any of the other islands within the Mariana Archipelago. There was strong evidence during the 2012 survey that FDM has become subject to commercial spear fishing. This has resulted in changes to the estimated total numbers of some key fishery target species and changes in the behavior of those species towards divers. An infestation of coral barnacles was observed in 2012, but this is not related to DoD training activities. The greatest threat to FDM’s marine resources is overfishing. v This page is intentionally left blank. vi ACRONYMS AND ABBREVIATIONS BDU Bomb, Dummy Unit BRT Biological Review Team CCA Crustose Coralline Algae cm Centimeters CNMI Commonwealth of the Northern Mariana Islands COTS Crown-of-thorns starfish CRED Coral Reef Ecosystem Division DoD Department of Defense DoN Department of the Navy DPV Diver Propulsion Vehicles EIS Environmental Impact Statement EOD Explosive Ordnance Disposal EOD DET MARI Explosive Ordnance Disposal Detachment Marianas ERW Expanding Regional Warning ESA Endangered Species Act FDM Farallon De Medinilla GP General Purpose H2O Water ha Hectare HIG Hawaiian Institute of Geophysics ID Identification IO Indian Ocean Watch Bulletin IRIS Incorporated Research Institutions for Seismology IUCN International Union for the Conservation of Nature JMA Japan Meteorological Agency km Kilometers lb. Pound LPI Line Point Intercept LT Lieutenant m Meter mi Mile(s) MK Mark MPA Marine Protected Area MRAMP Mariana Reef Assessment Monitoring Program MT Motor Tug Boat Mw Moment Magnitude NAVFAC Naval Facilities Engineering Command NAVFAC EXWC Naval Facilities Engineering and Expeditionary Warfare Center NAVFAC PAC Naval Facilities Engineering Command Pacific NMFS National Marine Fisheries Service NOAA National Oceanic and Atmospheric Administration nm Nautical Mile PIFSC Pacific Islands Fisheries Science Center vii RHIB Rigid Hull Inflatable Boat SCUBA Self-contained Underwater Breathing Apparatus SDS Scientific Diving Services TIB Tsunami Information Bulletin TL Total length TWI Tsunami Watch Information viii TABLE OF CONTENTS EXECUTIVE SUMMARY .............................................................................................................v ACRONYMS AND ABBREVIATIONS .................................................................................... VII 1.0 INTRODUCTION ................................................................................................................1 1.1 General Geography and Geology ......................................................................................... 2 1.1.1 EARTHQUAKES .............................................................................................................3 1.1.2 TSUNAMIS ......................................................................................................................3 1.1.3 VOLCANIC ACTIVITY ..................................................................................................5 1.1.4 TYPHOONS......................................................................................................................7 1.2 Biological Environment ......................................................................................................