Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia
There is a world-wide trend for deteriorating water quality and light levels in the coastal zone, and this has been linked to declines in seagrass abundance. Localized management of seagrass meadow health requires that water quality guidelines for meeting seagrass growth requirements are available....
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ftqueenslanddeaf:oai:jdecs1.ecs.soton.ac.uk:3856 2023-05-15T18:49:56+02:00 Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia Collier, C. J. Waycott, M. McKenzie, L. J. 2012-12 http://era.daf.qld.gov.au/id/eprint/3856/ unknown http://dx.doi.org/10.1016/j.ecolind.2012.04.005 http://era.daf.qld.gov.au/id/eprint/3856/ Collier, C. J., Waycott, M. and McKenzie, L. J. (2012) Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia. Ecological Indicators, 23 . pp. 211-219. ISSN 1470-160X Great Barrier Reef Seagrasses Fishery conservation Article PeerReviewed 2012 ftqueenslanddeaf https://doi.org/10.1016/j.ecolind.2012.04.005 2022-05-30T13:30:23Z There is a world-wide trend for deteriorating water quality and light levels in the coastal zone, and this has been linked to declines in seagrass abundance. Localized management of seagrass meadow health requires that water quality guidelines for meeting seagrass growth requirements are available. Tropical seagrass meadows are diverse and can be highly dynamic and we have used this dynamism to identify light thresholds in multi-specific meadows dominated by Halodule uninervis in the northern Great Barrier Reef, Australia. Seagrass cover was measured at similar to 3 month intervals from 2008 to 2011 at three sites: Magnetic Island (MI) Dunk Island (DI) and Green Island (GI). Photosynthetically active radiation was continuously measured within the seagrass canopy, and three light metrics were derived. Complete seagrass loss occurred at MI and DI and at these sites changes in seagrass cover were correlated with the three light metrics. Mean daily irradiance (I-d) above 5 and 8.4 mol m(-2) d(-1) was associated with gains in seagrass at MI and DI, however a significant correlation (R = 0.649, p < 0.05) only occurred at MI. The second metric, percent of days below 3 mol m(-2) d(-1), correlated the most strongly (MI, R = -0.714, p < 0.01 and DI, R = -0.859, p = <0.001) with change in seagrass cover with 16-18% of days below 3 mol m(-2) d(-1) being associated with more than 50% seagrass loss. The third metric, the number of hours of light saturated irradiance (H-sat) was calculated using literature-derived data on saturating irradiance (E-k). H-sat correlated well (R = 0.686, p <0.01; and DI, R = 0.704, p < 0.05) with change in seagrass abundance, and was very consistent between the two sites as 4 H-sat was associated with increases in seagrass abundance at both sites, and less than 4 H-sat with more than 50% loss. At the third site (GI), small seasonal losses of seagrass quickly recovered during the growth season and the light metrics did not correlate (p > 0.05) with change in percent cover, except ... Article in Journal/Newspaper Green Island Magnetic Island eRA (eResearch Archive - Queensland Department of Agriculture and Fisheries) Magnetic Island ENVELOPE(77.909,77.909,-68.543,-68.543) Ecological Indicators 23 211 219 |
institution |
Open Polar |
collection |
eRA (eResearch Archive - Queensland Department of Agriculture and Fisheries) |
op_collection_id |
ftqueenslanddeaf |
language |
unknown |
topic |
Great Barrier Reef Seagrasses Fishery conservation |
spellingShingle |
Great Barrier Reef Seagrasses Fishery conservation Collier, C. J. Waycott, M. McKenzie, L. J. Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia |
topic_facet |
Great Barrier Reef Seagrasses Fishery conservation |
description |
There is a world-wide trend for deteriorating water quality and light levels in the coastal zone, and this has been linked to declines in seagrass abundance. Localized management of seagrass meadow health requires that water quality guidelines for meeting seagrass growth requirements are available. Tropical seagrass meadows are diverse and can be highly dynamic and we have used this dynamism to identify light thresholds in multi-specific meadows dominated by Halodule uninervis in the northern Great Barrier Reef, Australia. Seagrass cover was measured at similar to 3 month intervals from 2008 to 2011 at three sites: Magnetic Island (MI) Dunk Island (DI) and Green Island (GI). Photosynthetically active radiation was continuously measured within the seagrass canopy, and three light metrics were derived. Complete seagrass loss occurred at MI and DI and at these sites changes in seagrass cover were correlated with the three light metrics. Mean daily irradiance (I-d) above 5 and 8.4 mol m(-2) d(-1) was associated with gains in seagrass at MI and DI, however a significant correlation (R = 0.649, p < 0.05) only occurred at MI. The second metric, percent of days below 3 mol m(-2) d(-1), correlated the most strongly (MI, R = -0.714, p < 0.01 and DI, R = -0.859, p = <0.001) with change in seagrass cover with 16-18% of days below 3 mol m(-2) d(-1) being associated with more than 50% seagrass loss. The third metric, the number of hours of light saturated irradiance (H-sat) was calculated using literature-derived data on saturating irradiance (E-k). H-sat correlated well (R = 0.686, p <0.01; and DI, R = 0.704, p < 0.05) with change in seagrass abundance, and was very consistent between the two sites as 4 H-sat was associated with increases in seagrass abundance at both sites, and less than 4 H-sat with more than 50% loss. At the third site (GI), small seasonal losses of seagrass quickly recovered during the growth season and the light metrics did not correlate (p > 0.05) with change in percent cover, except ... |
format |
Article in Journal/Newspaper |
author |
Collier, C. J. Waycott, M. McKenzie, L. J. |
author_facet |
Collier, C. J. Waycott, M. McKenzie, L. J. |
author_sort |
Collier, C. J. |
title |
Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia |
title_short |
Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia |
title_full |
Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia |
title_fullStr |
Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia |
title_full_unstemmed |
Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia |
title_sort |
light thresholds derived from seagrass loss in the coastal zone of the northern great barrier reef, australia |
publishDate |
2012 |
url |
http://era.daf.qld.gov.au/id/eprint/3856/ |
long_lat |
ENVELOPE(77.909,77.909,-68.543,-68.543) |
geographic |
Magnetic Island |
geographic_facet |
Magnetic Island |
genre |
Green Island Magnetic Island |
genre_facet |
Green Island Magnetic Island |
op_relation |
http://dx.doi.org/10.1016/j.ecolind.2012.04.005 http://era.daf.qld.gov.au/id/eprint/3856/ Collier, C. J., Waycott, M. and McKenzie, L. J. (2012) Light thresholds derived from seagrass loss in the coastal zone of the northern Great Barrier Reef, Australia. Ecological Indicators, 23 . pp. 211-219. ISSN 1470-160X |
op_doi |
https://doi.org/10.1016/j.ecolind.2012.04.005 |
container_title |
Ecological Indicators |
container_volume |
23 |
container_start_page |
211 |
op_container_end_page |
219 |
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1766243550734843904 |