Bleaching-driven reef community shifts drive pulses of increased reef sediment generation
Perry, Chris; Morgan, Kyle; Lange, Ines; Yarlett, Rob (2020), Bleaching-driven reef community shifts drive pulses of increased reef sediment generation, Dryad, Dataset, https://doi.org/10.5061/dryad.08kprr4zc
Benthic cover data was collected along replicate 10 m transects (n= 5) in January and September 2016, March 2017 and January 2019, from the south-western margins of five uninhabited atoll interior reefs in Gaafu Dhaalu atoll, southern Maldives. All data were collected from sites along the outer reef flat/upper reef front (~2 m depth contour) using the ReefBudget methodology. Recorded groups included scleractinian corals to the genera and morphological level e.g., Acropora branching, Porites massive etc.; crustose coralline algae (CCA); turf algae; fleshy macroalgae; Halimeda spp.; sediment; rubble; and other benthic organisms. All data were collected as a function of the true 3-dimensional surface of the reefs, thus including cover on overhangs and vertical surfaces.
Parrotfish abundance (ind. ha-1) was quantified via underwater visual census (UVC) along eight 30 m x 4 m belt transects in the same region of each reef in each time period, with all surveys completed by the same experienced observer (K.M.M.). Details on parrotfish species, life phase (juvenile, initial and terminal) and total length (in size classes of 10 cm) were recorded for each individual. Parrotfish biomass (kg ha-1) for each species and size class was then calculated using established length-weight relationships and multiplied by fish abundance, following the approach described in: Januchowski-Hartley FA, Graham NA, Wilson SK, Jennings S, Perry CT. (2017) Drivers and predictions of coral reef carbonate budget trajectories. Proc Royal Soc B. 284:20162533 (doi.org/10.1098/rspb.2016.2533)
Table 1: Mean transect level cover (% cover) data for corals, turf and filamentous algae, and Halimeda from 5 southern Maldives reef sites from Jan 2016, Sept 2016, March 2017 and Jan 2019.
Table 2: Mean transect level (n = 8) data on parrotfish abundance (ind./30 x 4 m belt transect) and biomass (kg ha-1) from the 5 southern Maldives reef sites from Jan 2016, Sept 2016, March 2017 and Jan 2019
Leverhulme Trust, Award: RF-2015-152
Fondation Bertarelli, Award: Bertarelli Programme in Marine Science