Sharks as exfoliators: widespread chafing between marine organisms suggests and unexplored ecological role

• Main Authors: Lacey Williams, Alexandra Anstett, Victor Bach Muñoz, John Chisholm, Chris Fallows, Jonathan Green, Jesús Erick Higuera Rivas, Gregory Skomal, Megan Winton, Neil Hammerschlag
• Format: Dataset
• Language: unknown
• Published: Knowledge Network for Biocomplexity 2021
• Subjects: behavior; chafing; cleaning station; dermal denticles; ecological function; fish; microbiome; parasite; predation risk; shark; skin; symbiosis; Carcharhinus amblyrhynchos; Carcharhinus perezi; Carcharodon carcharias; Cetorhinus maximus; Prionace glauca; Carcharhinus falciformis; Carcharhinus longimanus; Rhincodon typus; Caranx hippos; Caranx ruber; Caranx sexfasciatus; Elagatis bipinnulata; Lichia amia; Morone saxatilis; Pomatomus saltatrix; Seriola lalandi; Thunnus albacares; Thunnus thynnus; Trachurus symmetricus; Cat Island; Darwin Island; Dyer; False Bay; Galapagos; Jupiter; Seal Island
• Online Access: https://search.dataone.org/view/urn:uuid:960862c4-b13a-4044-9937-2c02b4fbafb1

This dataset is associated to the article “Sharks as exfoliators: widespread chafing between marine organisms suggests and unexplored ecological role” by Williams et al. (2021), to be published in Ecology's The Scientific Naturalist. Specifically, these are the video and jpeg files used to generate Table 1 in the Appendix and Figures 1 and 3 as well as the metadata master table which includes all documented chafing incidents and the file names for the associated video or photograph. These data are the results of collating 47 video, photographic and anecdotal observations from thirteen different locations across the world's oceans. This appears to be the only phenomenon whereby a prey actively seeks out and rubs up against a predator. Of the 47 recorded incidents, 25 were recorded using a drone; six incidents were recorded subsurface by divers; five were documented photographically; the rest were anecdotal observations. Given the logistical difficulties in observing sharks in the wild, the prevalence of reports of chafing involving multiple species in multiple locations around the world raises several ecological questions. We hypothesize several ecological implications and suggest future research to better understand this phenomenon. We conducted research in accordance with research permits no. CN32-31-7168 and RES2019/24, issued by CapeNature and the South African Department of Environmental Affairs, respectively. Drone data from Plettenberg Bay, South Africa was collected during the 2019 field season of the first author’s ongoing Masters thesis, which is funded by the Isermann Family Foundation, Give Back Brands Foundation, and the Shark Research and Conservation (SRC) lab at the University of Miami’s Rosenstiel School of Marine and Atmospheric Science. Authors LHW and AA wrote the manuscript. All authors contributed to data collection, analysis and manuscript revisions. The zip file contains: • Metadata Master Table.csv (Metadata table containing all collated observations used in analysis and associated file names for incidents that were recorded photographically or by video.) • Chafing Photos (folder containing all photographically documented chafing incidents included in the manuscript; figure lables correspond to each incident's entry in the master table.) • Chafing Videos (folder containing all video recorded chafing incidents included in the manuscript; figure lables correspond to each incident's entry in the master table.)