Six years of demography data for 11 reef coral species

Scleractinian corals are colonial animals with a range of life history strategies that make up diverse species assemblages that contribute to coral reef growth. We tagged and tracked approximately 30 colonies from each of 11 species for six years (2009-2015) in order to measure their vital rates and competitive interactions on the reef crest at Trimodal Reef, Lizard Island, Australia. Pairs of species were chosen from five growth forms (massive [Goniastrea pectinata and G. retiformis], digitate [Acropora humilis and A. cf. digitifera], corymbose [A. millepora and A. nasuta], tabular [A. cytherea and A. hyacinthus] and arborescent [A. robusta and A. intermedia]) where one species of the pair was locally rare and the other abundant. (An extra corymbose species, A. spathulata was included when it became apparent that A. millepora was too rare to work with on the reef crest, making the 11 species in total.) The tagged colonies were visited each year in the weeks prior to mass spawning. During visits, photographs were taken by two or more observers from directly above and on the horizontal plane with a scale plate to track planar area. Dead or missing colonies were recorded and new colonies tagged in order to maintain approximately 30 colonies per species throughout the six years of the study. In addition to tracking tagged corals, 30 fragments were collected from neighboring untagged colonies of each species for counting numbers of eggs per polyp (fecundity); and fragments of untagged colonies were brought into the laboratory where spawned eggs were collected for size and energy measurements. We also conducted surveys at the study site to generate size structure data for each species in several of the years. Each tagged colony photograph was digitized by at least two people. Therefore, we could examine sources of error in planar area for both photographers and outliners. Competitive interactions were recorded for a subset of species by measuring the margins of tagged colony outlines interacting with neighboring corals. The study was abruptly ended by Tropical Cyclone Nathan that killed all but nine of the over 300 tagged colonies in early 2015. Nonetheless, these data will be of use to other researchers interested in coral demography and coexistence, functional ecology, and parametrizing population, community and ecosystem models.