Cruise Report ASRAMP 2018 May 31 August 19, 2018

Transcription

1 Cruise Report ASRAMP 2018 May 31 August 19, 2018 Contributing Authors Dr. Stuart Sandin 1 Dr. Brian Zgliczynski 1 Lindsay Bonito 1 1 Scripps Institution of Oceanography Report prepared on 17 September 2018

2 Scripps Photomosaic Dive Team Leg 1 (Howland, Baker, Swains) Christopher Sullivan, Staff Researcher Leg 2 (Tutuila, Ofu & Olosega,Ta u, Rose Atoll ) Samantha Clements, Staff Researcher Leg 3 (Jarvis, Palmyra, Kingman) Nicole Pedersen, Staff Researcher Executive Summary The 100 Island Challenge team from Dr. Stuart Sandin s laboratory at Scripps Institution of Oceanography collaborated with NOAA s Pacific Islands Fisheries Science Center s (PIFSC) Ecosystem Sciences Division (ESD) during the most recent cruise throughout the American Samoan archipelago, Line Islands and Pacific Remote Islands in summer of The mission aboard the NOAA ship Hi ialakai embarked to study coral reef ecosystems across islands for continued monitoring efforts and to asess the recent bleaching event of To complement the long-term monitoring of the CREP program, the 100 Island Challenge team utilized the large-scale imaging techniques to survey over 56 sites across the Pacific. Nearly all photomosaics collected were at established NCRMP sites, with some images archiving locations of various monitoring units, including CAUs, ARMs, and BMUs. The large-scale imagery is currently being processed in-house at SIO, where raw data and data products will be made available. These products include the 2D orthoprojections and 3D model reconstructions of every reef imaged during the ASRAMP cruise. In total, the ASRAMP photomosaics imaged an area nearly 5.5km 2 over across the Samoan and Line archipelagos and remote island areas.

3 ASRAMP Photomosaic Survey Locations Figure 1. Locations of surveyed archipelagos during ASRAMP 2018

4 ASRAMP Photomosaic Survey Locations Figure 2. Survey locations in the Pacific Remote Islands region (Leg 1)

5 ASRAMP Photomosaic Survey Locations Figure 3. Survey locations in American Samoa (Leg 2)

6 ASRAMP Photomosaic Survey Locations Figure 4. Map of survey sites within the Line Islands (Leg 3)

7 ASRAMP Photomosaic Survey Metadata Table 1. ASRAMP 2018 photomosaic survey sites. Leg Date Island Station Latitude Longitude Area (m 2 ) Reef Type Mosaic Divers 100IC Site Resurvey Leg 1 6/8/2018 Howland HOW_ Forereef CJS, AH Yes Yes Leg 1 6/10/2018 Howland HOW_ Forereef CJS, AH Yes No Leg 1 6/10/2018 Howland HOW_ Forereef CJS, HB Yes Yes Leg 1 6/11/2018 Howland HOW_SIO Forereef CJS, CC Yes No Leg 1 6/11/2018 Howland HOW_SIO Forereef CJS, CC Yes No Leg 1 6/12/2018 Baker BAK_ Forereef CJS, AH Yes No Leg 1 6/13/2018 Baker BAK_ Forereef CJS Yes No Leg 1 6/14/2018 Baker BAK_ Forereef CJS Yes No Leg 1 6/15/2018 Baker BAK_ Forereef CJS, AH Yes Yes Leg 1 6/19/2018 Swains SWA_ Forereef CJS, AH Yes No Leg 1 6/19/2018 Swains SWA_ Forereef CJS, NP Yes No Leg 1 6/20/2018 Swains SWA_ Forereef CJS, HB Yes No Leg 1 6/20/2018 Swains SWA_ Forereef CJS, AH Yes No Leg 1 6/21/2018 Swains SWA_ Forereef CJS, NP Yes No Leg 1 6/21/2018 Swains SWA_SIO Forereef CJS, HB Yes No Leg 1 6/21/2018 Swains SWA_SIO Forereef CJS, AH Yes No Leg 2 6/28/2018 Tutuila TUT_ Forereef SMC, AH, HB, CK Yes No Leg 2 6/29/2018 Tutuila TUT_ Forereef SMC, AH, CK, HB Yes No Leg 2 7/1/2018 Tutuila TUT_ Forereef SMC, HB Yes No Leg 2 7/2/2018 Tutuila TUT_ Forereef SMC, AH Yes No Leg 2 7/2/2018 Tutuila TUT_ Forereef SMC, CK, SC Yes No Leg 2 7/3/2018 Tutuila TUT_ Forereef SMC, HB Yes No Leg 2 7/3/2018 Tutuila TUT_ Forereef SMC, AH Yes No Leg 2 7/6/2018 Tutuila TUT_ Forereef SMC, AH, HB, CK, SC Yes No Leg 2 7/6/2018 Tutuila TUT_ Forereef SMC, HB, SC Yes No Leg 2 7/7/2018 Ofu OFU_ Forereef SMC, AH, HB, CK, SC Yes No

8 Leg Date Island Station Latitude Longitude Area (m 2 ) Reef Type Mosaic Divers 100IC Site Resurvey Leg 2 7/9/2018 Ofu OFU_ Forereef SMC, CK, SC, AH Yes No Leg 2 7/10/2018 Ofu OFU_ Forereef SMC, HB, SC Yes No Leg 2 7/10/2018 Olosega OLO_ Forereef SMC, CK, SC Yes No Leg 2 7/11/2018 Ta'u TAU_ Forereef SMC, BV, HB, SC Yes No Leg 2 7/11/2018 Ta'u TAU_Big Mama NA Forereef SMC, BV, HB, SC No No Leg 2 7/12/2018 Ta'u TAU_ Forereef SMC, AH, HB, SC Yes No Leg 2 7/12/2018 Ta'u TAU_ Forereef SMC, AH, SC Yes No Leg 2 7/14/2018 Rose Atoll ROS_ Forereef SMC, HB, SC Yes No Leg 2 7/14/2018 Rose Atoll ROS_ Forereef SMC, AH, CK, SC Yes No Leg 2 7/16/2018 Ta'u TAU_ Forereef SMC, AH, CK, SC Yes No Leg 3 7/28/2018 Jarvis JAR_ Forereef NEP, CK, TO, KG Yes Yes Leg 3 7/28/2018 Jarvis JAR_SIO Forereef AH, CK Yes No Leg 3 7/29/2018 Jarvis JAR_ Forereef NEP, CK, AH, KG, TO Yes Yes Leg 3 7/29/2018 Jarvis JAR_ Forereef NEP, CK, AH, KG, TO Yes Yes Leg 3 7/30/2018 Jarvis JAR_ Forereef NEP, KG, AH, TO Yes Yes Leg 3 7/30/2018 Jarvis JAR_SIO Forereef NEP, CK, KG Yes Yes Leg 3 7/30/2018 Jarvis JAR_SIO Forereef NEP, AH Yes No Leg 3 7/31/2018 Jarvis JAR_ Forereef NEP, CK, KG, AH Yes Yes Leg 3 8/2/2018 Palmyra PAL_ Forereef NEP, CK, KG, TO No No Leg 3 8/3/2018 Palmyra PAL_ Forereef NEP, CK, KG, AH No No Leg 3 8/4/2018 Palmyra PAL_ Forereef NEP, CK, KG, AH No No Leg 3 8/5/2018 Palmyra PAL_ Forereef NEP, CK, KG, AH No No Leg 3 8/5/2018 Palmyra PAL_ Forereef NEP, KG, AH, TO No No Leg 3 8/6/2018 Palmyra PAL_ Forereef NEP, KG, AH, TO, EB No No Leg 3 8/8/2018 Kingman KIN_ Lagoon NEP, KG, AH, TO, EB No No Leg 3 8/8/2018 Kingman KIN_ Lagoon NEP, KG, CK, AH, TO No No Leg 3 8/9/2018 Kingman KIN_ Forereef NEP, KG, CK, AH, TO Yes No Leg 3 8/10/2018 Kingman KIN_ Forereef NEP, KG, CK, AH, TO Yes No Leg 3 8/10/2018 Kingman KIN_ Forereef NEP, KG, AH, TO, EB Yes No

9 Leg Date Island Station Latitude Longitude Area (m 2 ) Reef Type Mosaic Divers 100IC Site Resurvey Leg 3 8/11/2018 Kingman KIN_ Forereef NEP, MW, AG, JG Yes No 1 Divers: AG- Austin Greene; AH- Ari Halperin; BV- Bernardo Vargas; CC- Chelsea Counsell; CK- Courtney Klepac; CJS- Chris Sullivan; EB- Evan Barba; HB- Hannah Barkely; KG- Kevin Green; JG- Joao Gariqques; MW- Morgan Winston; NP- Noah Pomeroy; NEP- Nicole Pedersen; SC- Sandy Calhoun; SMC- Samantha Clements; TO- Tom Oliver

10 100 Island Challenge This research initiative employs novel approaches for studying coral reef community dynamics through the application of underwater photomosaic technology. Working with colleagues from the University of Miami, we have built a camera system that allows us to capture images of large swaths of the reef surface. Further, by re-visiting exact locations multiple times and replicating photography, we have an unprecedented opportunity to track the dynamics of corals and algae. Particularly, with advanced image analysis we can track how a reef community changes, addressing questions of coral growth, death, and competition that are currently unresolved. We have field-trialed this photomosaic equipment and are developing a reliable image analysis protocol. We are now poised to apply this tool to generate the large-scale data of reef community dynamics that have, to date, been unavailable. Further, by combining these imagebased data with reliable information about the composition of the fish community, the general oceanography, and the human situation of each location, we can begin to elucidate the conditions that are more (or less) conducive to the maintenance of growing and so-called healthy coral reefs. Relevance to NOAA monitoring program: The photomosaic technology complements the long-term efforts of the NOAA CREP monitoring program by collecting equivalent benthic ecological data, in addition to archiving high-resolution imagery of the reefs. From these photomosaics, the extraction of comparable benthic ecological data to current standard methods is achievable and allows for the flexibility of additional research topics to be explored (i.e. juvenile coral demography and distribution, largescale spatial ecology, temporal projections of reef change, etc). The photomosaic and 3D model reconstruction technology is a huge step forward in terms of ecological data collection, and in terms of outreach and communication. The visualization products have been pivotal in translating the science to a multitude of stakeholders. The collaborative efforts between NOAA and SIO have been well-established through the post-processing of the traditional benthic photoquadrat data, and can expand further through this new avenue. For more information, visit

11 Benthic Photomosaic Survey Methods Benthic photomosaics were completed to collect a permanent record of reef habitat on a larger scale (100m 2 ). The benthic photomosaic system consists of a diver operating a camera system including dual SLR cameras and video camera mounted to a custom frame. The first still camera is setup to use a wide-angle 18 mm focal length lens to sure high overlap among adjacent images while the second still camera uses a 55 mm focal length lens to capture images with sub-cm resolution. To obtain the large image covering 10m x10m the diver operating the camera system swims a gridded pattern approximately 1.5 m above the benthos recording images at 1 sec intervals throughout the plot. Images are later stitched together analytically using custom algorithms to create a single image file representative of the 100m 2 plot. Figure 3. Photomosaic Data Collection Method. Each mosaic is stitched together from ~2000 photos acquired by swimming back and forth over the reef in the pattern on the left. Figure 4. Photomosaic Processing Method. Once stitched, each mosaic is ecologically post-processed by tracing individual coral colonies and algae species of interest. Once individual colonies are traced and identified (E), data is exported and run through custom algorithms to evaluate both standard metrics including percent coral cover and more complex spatial statistics.

12 Photomosaic Results & Products All mosaic products will be available online both on the 100 Island Challenge website and through our Public Google Drive folder. 3D model videos are also available for viewing through our 100 Island Challenge YouTube channel. Sample Photomosaic Site: KIN_11 Island: Kingman

13 Trip Photos