York, Paul H., Scott, Abbi L., Smith, Timothy M., Davey, Peter A., Carter, Alex B., and Rasheed, Michael A. (2022) Megaherbivory is a major force driving seagrass structure on the Great Barrier Reef. In: [Presented at the Australian Marine Sciences Association Conference 2022]. 445. From: AMSA 2022: 58th Australian Marine Sciences Association Conference, Cairns, QLD, Australia, 7-11 August 2022.

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Abstract

Herbivory is a key mechanism controlling ecosystem stability, function and diversity globally. Tropical seagrass ecosystems are susceptible to large scale grazing from megaherbivores (turtles and dugongs) but research on the impact of grazing on seagrass structure and function is only beginning to receive attention. We established a network of megaherbivore exclusion cages at ten sites across 1200 km of the Great Barrier Reef to assess broad scale patterns and impacts of megaherbivore grazing on seagrasses. Sites covered a range of seagrass habitat types (e.g. coastal, reef top, deep-water), species and latitudes that were monitored periodically for between 2 and 15 months. Grazing impacted seagrass meadows at seven of the ten sites and there as an overall reduction in above ground biomass and canopy height. A change in seagrass species composition was detected in exclusion cages at two sites. The duration and extent of grazing impacts on seagrass structure however varied across sites. These results demonstrate the broad impact of megaherbivores on regulating the structure, composition and potentially the function of seagrass meadows on the Great Barrier Reef.

Item ID:	88747
Item Type:	Conference Item (Abstract / Summary)
Related URLs:	Organisation
Date Deposited:	08 Sep 2025 03:00
FoR Codes:	31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 50% 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 50%
SEO Codes:	18 ENVIRONMENTAL MANAGEMENT > 1802 Coastal and estuarine systems and management > 180299 Coastal and estuarine systems and management not elsewhere classified @ 100%
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