Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia
Large blooms of the marine cyanobacterium Lyngbya majuscula in Moreton Bay, Australia (27 degrees 05'S, 153 degrees 08'E) have been re-occurring for several years. A bloom was studied in Deception Bay (Northern Moreton Bay) in detail over the period January-March 2000. In situ data loggers...
Published in: | Harmful Algae |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2005
|
Subjects: | |
Online Access: | https://espace.library.uq.edu.au/view/UQ:74645 |
id |
ftunivqespace:oai:espace.library.uq.edu.au:UQ:74645 |
---|---|
record_format |
openpolar |
spelling |
ftunivqespace:oai:espace.library.uq.edu.au:UQ:74645 2023-05-15T17:37:13+02:00 Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia Watkinson, AJ ONeil, JM Dennison, WC S.E. Shumway T. Smayda 2005-01-01 https://espace.library.uq.edu.au/view/UQ:74645 eng eng Elsevier doi:10.1016/j.hal.2004.09.001 issn:1568-9883 Marine & Freshwater Biology Lyngbya Majuscula Moreton Bay Cyanobacteria C-14 Incorporation Pam Fluorometry Nutrient Natural Organic-matter Nutrient Concentrations Primary Productivity Estuarine Gradient North-atlantic N-2 Fixation Iron Phytoplankton Coastal Growth 270702 Marine and Estuarine Ecology (incl. Marine Ichthyology) C1 770399 Other Journal Article 2005 ftunivqespace https://doi.org/10.1016/j.hal.2004.09.001 2020-10-26T23:36:34Z Large blooms of the marine cyanobacterium Lyngbya majuscula in Moreton Bay, Australia (27 degrees 05'S, 153 degrees 08'E) have been re-occurring for several years. A bloom was studied in Deception Bay (Northern Moreton Bay) in detail over the period January-March 2000. In situ data loggers and field sampling characterised various environmental parameters before and during the L. majuscula bloom. Various ecophysiological experiments were conducted on L. majuscula collected in the field and transported to the laboratory, including short-term (2h) C-14 incorporation rates and long-term (7 days) pulse amplitude modulated (PAM) fluorometry assessments of photosynthetic capacity. The effects of L. majuscula on various seagrasses in the bloom region were also assessed with repeated biomass sampling. The bloom commenced in January 2000 following usual December rainfall events, water temperatures in excess of 24 degrees C and high light conditions. This bloom expanded rapidly from 0 to a maximum extent of 8 km(2) over 55 days with an average biomass of 210 g(dw)(-1) m(-2) in late February, followed by a rapid decline in early April. Seagrass biomass, especially Syringodium isoetifolium, was found to decline in areas of dense L. majuscula accumulation. Dissolved and total nutrient concentrations did not differ significantly (P > 0.05) preceding or during the bloom. However, water samples from creeks discharging into the study region indicated elevated concentrations of total iron (2.7-80.6 mu M) and dissolved organic carbon (2.5-24.7 mg L-1), associated with low pH values (3.8-6.7). C-14 incorporation rates by L. majuscula were significantly (P < 0.05) elevated by additions of iron (5 mu M Fe), an organic chelator, ethylenediaminetetra-acetic acid (5 mu M EDTA) and phosphorus (5 mu M PO4-3). Photosynthetic capacity measured with PAM fluorometry was also stimulated by various nutrient additions, but not significantly (P > 0.05). These results suggest that the L. majuscula bloom may have been stimulated by bioavailable iron, perhaps complexed by dissolved organic carbon. The rapid bloom expansion observed may then have been sustained by additional inputs of nutrients (N and P) and iron through sediment efflux, stimulated by redox changes due to decomposing L. majuscula mats. (c) 2004 Elsevier B.V. All rights reserved. Article in Journal/Newspaper North Atlantic The University of Queensland: UQ eSpace Moreton ENVELOPE(-46.033,-46.033,-60.616,-60.616) Moreton Bay ENVELOPE(-117.952,-117.952,75.734,75.734) Harmful Algae 4 4 697 715 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Marine & Freshwater Biology Lyngbya Majuscula Moreton Bay Cyanobacteria C-14 Incorporation Pam Fluorometry Nutrient Natural Organic-matter Nutrient Concentrations Primary Productivity Estuarine Gradient North-atlantic N-2 Fixation Iron Phytoplankton Coastal Growth 270702 Marine and Estuarine Ecology (incl. Marine Ichthyology) C1 770399 Other |
spellingShingle |
Marine & Freshwater Biology Lyngbya Majuscula Moreton Bay Cyanobacteria C-14 Incorporation Pam Fluorometry Nutrient Natural Organic-matter Nutrient Concentrations Primary Productivity Estuarine Gradient North-atlantic N-2 Fixation Iron Phytoplankton Coastal Growth 270702 Marine and Estuarine Ecology (incl. Marine Ichthyology) C1 770399 Other Watkinson, AJ ONeil, JM Dennison, WC Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia |
topic_facet |
Marine & Freshwater Biology Lyngbya Majuscula Moreton Bay Cyanobacteria C-14 Incorporation Pam Fluorometry Nutrient Natural Organic-matter Nutrient Concentrations Primary Productivity Estuarine Gradient North-atlantic N-2 Fixation Iron Phytoplankton Coastal Growth 270702 Marine and Estuarine Ecology (incl. Marine Ichthyology) C1 770399 Other |
description |
Large blooms of the marine cyanobacterium Lyngbya majuscula in Moreton Bay, Australia (27 degrees 05'S, 153 degrees 08'E) have been re-occurring for several years. A bloom was studied in Deception Bay (Northern Moreton Bay) in detail over the period January-March 2000. In situ data loggers and field sampling characterised various environmental parameters before and during the L. majuscula bloom. Various ecophysiological experiments were conducted on L. majuscula collected in the field and transported to the laboratory, including short-term (2h) C-14 incorporation rates and long-term (7 days) pulse amplitude modulated (PAM) fluorometry assessments of photosynthetic capacity. The effects of L. majuscula on various seagrasses in the bloom region were also assessed with repeated biomass sampling. The bloom commenced in January 2000 following usual December rainfall events, water temperatures in excess of 24 degrees C and high light conditions. This bloom expanded rapidly from 0 to a maximum extent of 8 km(2) over 55 days with an average biomass of 210 g(dw)(-1) m(-2) in late February, followed by a rapid decline in early April. Seagrass biomass, especially Syringodium isoetifolium, was found to decline in areas of dense L. majuscula accumulation. Dissolved and total nutrient concentrations did not differ significantly (P > 0.05) preceding or during the bloom. However, water samples from creeks discharging into the study region indicated elevated concentrations of total iron (2.7-80.6 mu M) and dissolved organic carbon (2.5-24.7 mg L-1), associated with low pH values (3.8-6.7). C-14 incorporation rates by L. majuscula were significantly (P < 0.05) elevated by additions of iron (5 mu M Fe), an organic chelator, ethylenediaminetetra-acetic acid (5 mu M EDTA) and phosphorus (5 mu M PO4-3). Photosynthetic capacity measured with PAM fluorometry was also stimulated by various nutrient additions, but not significantly (P > 0.05). These results suggest that the L. majuscula bloom may have been stimulated by bioavailable iron, perhaps complexed by dissolved organic carbon. The rapid bloom expansion observed may then have been sustained by additional inputs of nutrients (N and P) and iron through sediment efflux, stimulated by redox changes due to decomposing L. majuscula mats. (c) 2004 Elsevier B.V. All rights reserved. |
author2 |
S.E. Shumway T. Smayda |
format |
Article in Journal/Newspaper |
author |
Watkinson, AJ ONeil, JM Dennison, WC |
author_facet |
Watkinson, AJ ONeil, JM Dennison, WC |
author_sort |
Watkinson, AJ |
title |
Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia |
title_short |
Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia |
title_full |
Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia |
title_fullStr |
Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia |
title_full_unstemmed |
Ecophysiology of the marine cyanobacterium, Lyngbya majuscula (Oscillatoriaceae) in Moreton Bay, Australia |
title_sort |
ecophysiology of the marine cyanobacterium, lyngbya majuscula (oscillatoriaceae) in moreton bay, australia |
publisher |
Elsevier |
publishDate |
2005 |
url |
https://espace.library.uq.edu.au/view/UQ:74645 |
long_lat |
ENVELOPE(-46.033,-46.033,-60.616,-60.616) ENVELOPE(-117.952,-117.952,75.734,75.734) |
geographic |
Moreton Moreton Bay |
geographic_facet |
Moreton Moreton Bay |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
doi:10.1016/j.hal.2004.09.001 issn:1568-9883 |
op_doi |
https://doi.org/10.1016/j.hal.2004.09.001 |
container_title |
Harmful Algae |
container_volume |
4 |
container_issue |
4 |
container_start_page |
697 |
op_container_end_page |
715 |
_version_ |
1766137008142417920 |