Data Descriptor: Seagrass morphometrics at species level in Moreton Bay, Australia from 2012 to 2013 Jimena Samper-Villarreal 1,2,3 , Chris Roelfsema 4 , Eva M. Kovacs 4 , Novi S. Adi 5 , Mitchell Lyons 6 , Peter J. Mumby 1,7 , Catherine E. Lovelock 7 , Megan I. Saunders 1,8 & Stuart R. Phinn 4 Seagrass above, below and total biomass, density and leaf area, length and width were quantified at a species level for 122 sites over three sampling periods in Moreton Bay, Australia. Core samples were collected in two regions: (1) a high water quality region with varying species assemblages and canopy complexity (98 sites); and (2) along a turbidity gradient in the bay (24 sites within four locations). Core samples were collected using a 15 cm diameter × 20 cm long corer. Seagrass dry biomass per component was quantified per species present in each sample. A total of 220 biomass and density data records are included, 130 from the high water quality region and 90 from the turbidity gradient. These data provide a detailed assessment of biomass, density and leaf metrics per species sampled from Moreton Bay over 2012–2013. In future, these can be used as a baseline to assess seasonal and spatial variation within the bay, within the region and among regions. Design Type(s) observation design • time series design • biodiversity assessment objective Measurement Type(s) morphometry Technology Type(s) morphology measurement Factor Type(s) environmental condition • spatiotemporal_interval Sample Characteristic(s) Alismatales • Moreton Bay 1 Marine Spatial Ecology Lab and ARC Centre of Excellence for Coral Reef Studies, University of Queensland, St Lucia, Queensland 4072, Australia. 2 CSIRO Ocean and Atmosphere Flagship, Ecosciences Precinct, Brisbane, Queensland 4001, Australia. 3 Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) & Escuela de Biología, Universidad de Costa Rica, San Pedro, 11501-2060 San José, Costa Rica. 4 Remote Sensing Research Centre, School of Earth and Environmental Sciences, University of Queensland, St Lucia, Queensland 4072, Australia. 5 Centre for Marine Research, Ministry of Marine Affairs and Fisheries, Jl. Pasir Putih 2, Ancol Timur, Jakarta 14430, Indonesia. 6 Centre for Ecosystem Science, University of New South Wales, Sydney, New South Wales 2052, Australia. 7 School of Biological Sciences, University of Queensland, St Lucia, Queensland 4072, Australia. 8 Global Change Institute, University of Queensland, St Lucia, Queensland 4072, Australia. Correspondence and requests for materials should be addressed to J.S.-V. (email: jimena.sampervillarreal@ucr.ac.cr). OPEN Received: 28 November 2016 Accepted: 3 April 2017 Published: 9 May 2017 www.nature.com/scientificdata SCIENTIFIC DATA | 4:170060 | DOI: 10.1038/sdata.2017.60 1