Habitats and fish communities at mesophotic depths in the Mexican Pacific
Hollarsmith, Jordan A. et al. (2020), Habitats and fish communities at mesophotic depths in the Mexican Pacific, Dryad, Dataset, https://doi.org/10.5061/dryad.pnvx0k6j3
All surveys were conducted using a small (roughly 1 m3 and 11 kg) and highly portable ROV (BlueRobotics BlueROV2) capable of diving to 100 m and equipped with four 1500 lumen lights, two cameras that filmed in 1080 p resolution (one 8MP Raspberry Pi v2 Camera and one GoPro HERO3 or HERO4), a Measurement Specialties MS5837-30BA sensor that measured depth and temperature, and a 250 m tether (see Appendix S1 in Supporting Information for image of ROV). At each site, the ROV operator would descend the ROV directly to the benthos and begin roving swim surveys. The duration of surveys ranged from 7 to 65 minutes, depending on weather and ocean conditions, battery duration, and cruise schedules. Video, depth, and temperature were continuously recorded and saved for later analysis. Footage from the GoPro and Raspberry Pi cameras were synchronized for each dive and cut into 5-minute transects, starting at the time the ROV reached the benthos. In each video, all fish were identified to the lowest possible taxonomic level using Robertson and Allen (2015). Biotic and abiotic habitat characteristics of each transect were also noted. Biogenic habitat represented the dominant foundation species group (sensuDayton 1972) that contributed to three-dimensional habitat, including coral, unidentified filamentous algae, rhodolith beds (also termed maërl, comprised of colonies of slow-growing, free-living coralline algae [Foster 2001]), turf (broadly encompassing encrusting organisms such as algae, bryozoans, hydroids, and crustose coralline algae), and burrows in sand (see Appendix S2 for representative images of habitat classifications). Substrate classifications included reef (continuous hard substrate or large semi-continuous boulders), and non-reef (small patches of unconsolidated hard substrate over sand or sand). Depth (m) and temperature (°C) for each transect were averaged and rounded to the nearest integer.
This dataset only records the presence of a given species in a transect, not the abundance.
National Geographic Society, Award: Committee for Research and Exploration, CP-095ER-17
The Explorers Club, Award: Exploration Fund Grant
American Philosophical Society, Award: Lewis and Clark Fund for Exploration and Field Research
University of California Institute for Mexico and the United States, Award: Small Grant Program
National Science Foundation, Award: Graduate Research Fellowship Program 1650042
Consejo Nacional de Ciencia y Tecnología, Award: Fellowship Program 266599