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Recovery pathways from small-scale disturbance in a temperate Australian seagrass

Citation

Smith, TM and York, PH and Macreadie, PI and Keough, MJ and Ross, DJ and Sherman, CDH, Recovery pathways from small-scale disturbance in a temperate Australian seagrass, Marine Ecology - Progress Series, 542 pp. 97-108. ISSN 0171-8630 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 Inter-Research

DOI: doi:10.3354/meps11531

Abstract

Recovery from disturbance is a key element of ecosystem persistence, and recovery can be influenced by large-scale regional differences and smaller local-scale variations in environmental conditions. Seagrass beds are an important yet threatened nearshore habitat and recover from disturbance by regrowth, vegetative extension and dispersive propagules. We described recovery pathways from small-scale disturbances in the seagrass Zostera nigricaulis in Port Phillip Bay, a large embayment in southeastern Australia, and tested whether these pathways differed between 5 regions with different hydrodynamic conditions and water quality, and between sites within those regions. Recovery pathways were broadly consistent. When aboveground biomass was removed, recovery, defined as the point at which disturbed areas converged with undisturbed controls, took from 2 to 8 mo, but when we removed above- and below-ground biomass, it took between 2 and 13 mo. There was no evidence of recovery resulting from sexual reproduction at any sites regardless of the presence of seeds in the sediment or flower production. We found no differences in recovery at the regional scale, but we found substantial differences between local sites. At some sites, rapid recovery occurred because seagrasses grew quickly, but at others, apparent recovery occurred because regrowth coincided with overall declines in cover of undisturbed areas. Recovery time was unrelated to seagrass canopy height, biomass, percentage cover, stem density, seed bank density, epiphyte cover or sediment organic matter in seagrass adjacent to disturbance experiments. This study highlights the importance of understanding fine-scale variation in local recovery mechanisms, which may override or obscure any regional signal.

Item Details

Item Type:Refereed Article
Keywords:Zostera nigricaulis, Port Phillip Bay, sexual reproduction, asexual reproduction, resilience, spatial scales, Heterozostera nigricaulis
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
Author:Ross, DJ (Dr Jeff Ross)
ID Code:107853
Year Published:2016
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2016-03-30
Last Modified:2017-04-10
Downloads:0

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