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

Smith, Timothy M., York, Paul H., Macreadie, Peter I., Keough, Michael J., Ross, D. Jeff and Sherman, Craig D.H. 2016, Recovery pathways from small-scale disturbance in a temperate Australian seagrass, Marine ecology progress series, vol. 542, pp. 97-108, doi: 10.3354/meps11531.

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Title Recovery pathways from small-scale disturbance in a temperate Australian seagrass
Author(s) Smith, Timothy M.
York, Paul H.
Macreadie, Peter I.ORCID iD for Macreadie, Peter I.
Keough, Michael J.
Ross, D. Jeff
Sherman, Craig D.H.ORCID iD for Sherman, Craig D.H.
Journal name Marine ecology progress series
Volume number 542
Start page 97
End page 108
Total pages 12
Publisher Inter-Research
Place of publication Amelinghausen, Germany
Publication date 2016
ISSN 0171-8630
Keyword(s) Zostera nigricaulis
Port Phillip Bay
Sexual reproduction
Asexual reproduction
Spatial scales
Heterozostera nigricaulis
Science & Technology
Life Sciences & Biomedicine
Physical Sciences
Marine & Freshwater Biology
Environmental Sciences & Ecology
Summary 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.
Language eng
DOI 10.3354/meps11531
Field of Research 060701 Phycology (incl Marine Grasses)
050102 Ecosystem Function
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
0602 Ecology
Socio Economic Objective 960903 Coastal and Estuarine Water Management
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Inter-Research
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