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True size matters for conservation: a robust method to determine the size of deep-sea coral reefs shows they are typically small on seamounts in the Southwest Pacific Ocean

Citation

Williams, A and Althaus, F and Green, M and Maguire, K and Untiedt, C and Mortimer, N and Jackett, CJ and Clark, M and Bax, N and Pitcher, R and Schlacher, T, True size matters for conservation: a robust method to determine the size of deep-sea coral reefs shows they are typically small on seamounts in the Southwest Pacific Ocean, Frontiers in Marine Science, 7, (APR) Article 187. ISSN 2296-7745 (2020) [Refereed Article]


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Copyright Statement

Copyright 2020 Williams, Althaus, Green, Maguire, Untiedt, Mortimer, Jackett, Clark, Bax, Pitcher and Schlacher. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3389/fmars.2020.00187

Abstract

Protection of vulnerable marine ecosystems (VME) is a critical goal for marine conservation. Yet, in many deep-sea settings, where quantitative data are typically sparse, it is challenging to correctly identify the location and size of VMEs. Here we assess the sensitivity of a method to identify coral reef VMEs based on bottom cover and abundance of the stony coral Solenosmilia variabilis on deep seamounts, using image data from a survey off Tasmania, Australia, in 2018. Whilst there was some detectable influence from varying coral cover and the abundance of live coral heads, the distribution of coral reef VMEs was not substantially shifted by changing these criteria or altering the attributes of a moving window used to spatially aggregate coral patches. Whilst applying stricter criteria for classifying VMEs predictably produced smaller areas of coral reef VME, these differences were not sizeable and were often negligible. Coral reef VMEs formed large contiguous "blankets," mainly on the peaks and flanks of seamounts, but were absent from the continental slope where S. variabilis occurred at low abundance (cover) and/or had no living colonies. The true size of the Tasmanian coral reef VMEs ranged from 0.02 to 1.16 km2; this was relatively large compared to reefs of S. variabilis mapped on New Zealand seamounts, but is small compared to the scales used for regional model predictions of suitable habitat (typically 1 km2 grid cell), and much smaller than the smallest units of management interest (100s1000s km2). A model prediction of the area of suitable habitat for coral reef in the Tasmanian area was much greater than the area of coral reef estimated in this study. That the method to estimate VME size is not overly sensitive to the choice of criteria is highly encouraging in the context of designing spatial conservation measures that are robust, although its broader application, including to other VME indicator taxa, needs to be substantiated by scenario testing in different environments. Importantly, these results should give confidence for stakeholder uptake and form the basis for better predictive VME models at larger spatial scales and beyond single taxa.

Item Details

Item Type:Refereed Article
Keywords:vulnerable marine ecosystem, VME, Solenosmilia, seamount, towed-camera, deep sea, coral, fisheries management
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Natural Resource Management
Objective Division:Environment
Objective Group:Environmental Policy, Legislation and Standards
Objective Field:Coastal and Marine Management Policy
UTAS Author:Bax, N (Professor Nicholas Bax)
ID Code:139553
Year Published:2020
Deposited By:Directorate
Deposited On:2020-06-22
Last Modified:2020-07-31
Downloads:1 View Download Statistics

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