Abstract：
:The cause of persistent cyanobacteria scum formation in lakes is an unresolved subject. Scum refers to the event in which cyanobacteria are at the water surface of a lake. Factors like low turbulence levels, long day-light, high water temperatures and the buoyant capacity of cyanobacterial cells play a role in the occurrence of scums. However, they do not explain why scums are observed at periods during the day when according to theory they should have disappeared into the deeper water layers. In this study, we present an alternative explanation. The hypothesis we present here is that irreversible buoyancy of cyanobacteria colonies is created by the growth of gas bubbles on or within the mucilage of the colonies. These bubbles grow under oxygen super-saturated conditions. At low wind speed and high chlorophyll levels, the dissolved oxygen (DO) produced during photosynthesis by cyanobacteria, cannot escape sufficiently fast to the atmosphere hence a DO supersaturated condition arises in the water. At this stage, growth of oxygen bubbles may occur inside or attached to the mucilage. We present results of compression experiments to support our hypothesis. In a chamber, the pressure on lake water containing a natural cyanobacteria population is increased. At 3×105 and 4×105Pa the cyanobacteria colonies were not able to float anymore and sank. This pressure is lower than the 106Pa needed to collapse all gas vacuoles inside the cyanobacteria cells (Walsby, 1994). The observed change from floating to sinking colonies due to increased water pressure suggests that gas bubbles were present inside the colonies. In lakes, these gas bubbles may lead to permanent buoyancy, i.e. a persistent scum.
journal_name
Harmful Algaejournal_title
Harmful algaeauthors
Aparicio Medrano E,Uittenbogaard RE,van de Wiel BJ,Dionisio Pires LM,Clercx HJdoi
10.1016/j.hal.2016.10.002subject
Has Abstractpub_date
2016-12-01 00:00:00pages
27-35eissn
1568-9883issn
1878-1470pii
S1568-9883(15)30014-7journal_volume
60pub_type
杂志文章相关文献
HARMFUL ALGAE文献大全abstract：:Diarrhetic shellfish toxins (DSTs) are produced by the marine dinoflagellate, Dinophysis, as well as select species of benthic Prorocentrum. The DSTs can bioaccumulate in shellfish and cause gastrointestinal illness when humans consume high levels of this toxin. Although not routinely monitored throughout the U.S., re...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2019.101641
更新日期：2019-09-01 00:00:00
abstract：:The trophic mode of a phototrophic dinoflagellate is a critical factor in the dynamics of its harmful algal bloom. Recent discoveries of the mixotrophic capabilities of phototrophic dinoflagellates have changed the traditional view of bloom dynamics and prediction models. Here, mixotrophy in the harmful phototrophic d...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2018.03.009
更新日期：2018-04-01 00:00:00
abstract：:Karenia mikimotoi is a worldwide bloom-forming dinoflagellate in the genus Karenia. Blooms of this alga have been observed since the 1930s and have caused mass mortalities of fish, shellfish, and other invertebrates in the coastal waters of many countries, including Japan, Norway, Ireland, and New Zealand. This specie...
journal_title：Harmful algae
pub_type： 杂志文章,评审
doi：10.1016/j.hal.2019.101702
更新日期：2019-12-01 00:00:00
abstract：:Blooms of the marine diatom genus Pseudo-nitzschia that produce the neurotoxin domoic acid have been documented with regularity along the coast of southern California since 2003, with the occurrence of the toxin in shellfish tissue predating information on domoic acid in the particulate fraction in this region. Domoic...
journal_title：Harmful algae
pub_type： 杂志文章,评审
doi：10.1016/j.hal.2018.07.007
更新日期：2018-11-01 00:00:00
abstract：:Monterey Bay, California experiences near-annual blooms of Pseudo-nitzschia that can affect marine animal health and the economy, including impacts to tourism and commercial/recreational fisheries. One species in particular, P. australis, has been implicated in the most toxic of events, however other species within th...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2018.08.006
更新日期：2018-09-01 00:00:00
abstract：:Rising concentrations of atmospheric CO2 results in higher equilibrium concentrations of dissolved CO2 in natural waters, with corresponding increases in hydrogen ion and bicarbonate concentrations and decreases in hydroxyl ion and carbonate concentrations. Superimposed on these climate change effects is the dynamic n...
journal_title：Harmful algae
pub_type： 杂志文章,评审
doi：10.1016/j.hal.2019.03.012
更新日期：2020-01-01 00:00:00
abstract：:Mitigation of cyanobacterial or "blue-green algal" blooms is a challenging task for water managers across Australia. In the present study, a regional drinking water source (located in Central Queensland) was studied to identify the potential risks posed by cyanobacteria. Data were collected from the drinking water sou...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2018.04.010
更新日期：2018-06-01 00:00:00
abstract：:The parasitic dinoflagellate Amoebophrya infects broad range of marine organisms. Particularly, Amoebophrya infections in planktonic dinoflagellates can prevent or delay the formation of algal blooms, and recycle undergrazed planktonic dinoflagellates back to the microbial loop by disrupting host cells. Its ecological...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2016.12.003
更新日期：2017-02-01 00:00:00
abstract：:Athecate dinoflagellate Karlodinium veneficum is a universal toxic species possessing karlotoxins recognized especially as ichthyotoxic as well as cytotoxic and hemolytic. Blooms of K. veneficum, both single-species or accompanied with other species, occurred more frequently worldwide in recent years, including the co...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2018.12.001
更新日期：2019-01-01 00:00:00
abstract：:Blooms of ichthyotoxic microalgae pose a great challenge to the aquaculture industry world-wide, and there is a need for fast and specific methods for their detection and quantification in monitoring programs. In this study, quantitative real-time PCR (qPCR) assays for the detection and enumeration of three ichthyotox...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2018.04.007
更新日期：2018-05-01 00:00:00
abstract：:The spatio-temporal distribution of epiphytic and planktonic microalgae coupled with environmental factors was investigated for a one-year period in the Gulf of Tunis (northeastern Tunisia). Harmful microalgae assemblages were dominated by three toxic epiphytic dinoflagellates: Ostreopsis sp., Prorocentrum lima and Co...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2018.06.006
更新日期：2018-07-01 00:00:00
abstract：:The toxigenic diatom Pseudo-nitzschia multiseries Hasle, isolated from the U.S. Pacific Northwest, was examined in unialgal laboratory cultures and in natural assemblages during shipboard experiments, to examine cellular growth and domoic acid (DA) production as a function of nitrogen (N) substrate and availability ex...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2018.01.002
更新日期：2018-03-01 00:00:00
abstract：:The Gambierdiscus genus is a group of benthic dinoflagellates commonly associated with ciguatera fish poisoning (CFP), which is generally found in tropical or sub-tropical regions around the world. Morphologically similar species within the genus can vary in toxicity; however, species identifications are difficult or ...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2017.04.009
更新日期：2017-06-01 00:00:00
abstract：:Prey spectrum and feeding process of the mixotrophic thecate dinoflagellate Fragilidium mexicanum strain Fm-LOHABE01 were examined using a culture isolated from Masan Bay, Korea in 2011 during a summer bloom of the toxic dinoflagellate Alexandrium pacificum. The novel 18S and 28S rDNA sequences for F. mexicanum were a...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2017.02.007
更新日期：2017-03-01 00:00:00
abstract：:The dinoflagellate Alexandrium minutum is a toxic bloom-forming species distributed worldwide. The mechanisms driving and promoting the species blooms and their toxicity are studied and presented here. Most previously published work focuses on local and/or short-term scales. In this study, a broad temporal and spatial...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2017.05.005
更新日期：2017-07-01 00:00:00
abstract：:The red tide forming heterotrophic dinoflagellate Noctiluca scintillans is common in temperate to tropical waters around the world. Understanding the in situ prey of N. scintillans is essential for elucidating its role in marine microbial food webs. In this study, we applied two polymerase chain reaction (PCR)-based c...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2020.101928
更新日期：2020-11-01 00:00:00
abstract：:Four distinct coastal locations were sampled on a monthly basis near Long Key (Florida Keys, USA) over a 13-month period to study Gambierdiscus population dynamics on different substrates, including four macrophyte species (Dictyota spp., Halimeda spp., Laurencia spp., and Thalassia testudinum) and three artificial su...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2017.07.007
更新日期：2017-09-01 00:00:00
abstract：:This review summarizes the present state of knowledge regarding the toxic, bloom-forming cyanobacterium, Microcystis, with a specific focus on its geographic distribution, toxins, genomics, phylogeny, and ecology. A global analysis found documentation suggesting geographic expansion of Microcystis, with recorded bloom...
journal_title：Harmful algae
pub_type： 杂志文章,评审
doi：10.1016/j.hal.2015.12.007
更新日期：2016-04-01 00:00:00
abstract：:Extensive blooms of the toxic epiphytic/benthic dinoflagellate Ostreopsis cf. ovata are being reported with increasing frequency and spatial distribution in temperate coastal regions including the Mediterranean. These blooms are of human and environmental health concern due to the production of isobaric palytoxin and ...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2016.04.003
更新日期：2016-05-01 00:00:00
abstract：:A new species of toxic benthic dinoflagellate is described based on laboratory cultures isolated from two locations from Brazil, Rio de Janeiro and Bahia. The morphology was studied with SEM and LM. Cells are elliptical in right thecal view and flat. They are 37-44μm long and 29-36μm wide. The right thecal plate has a...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2017.11.001
更新日期：2017-12-01 00:00:00
abstract：:Shewanella sp. IRI-160 is an algicidal bacterium isolated from Delaware Inland Bays. It secretes water-soluble compounds that inhibit the growth of dinoflagellates. Previous research indicated that this bacterium does not have a negative impact on other algal species. In this research, Shewanella sp. IRI-160 was immob...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2020.101798
更新日期：2020-04-01 00:00:00
abstract：:Species of the benthic dinoflagellate Gambierdiscus produce polyether neurotoxins that caused ciguatera fish/shellfish poisoning in human. The toxins enter marine food webs by foraging of herbivores on the biotic substrates like macroalgae that host the toxic dinoflagellates. Interaction of Gambierdiscus and their mac...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2019.101671
更新日期：2019-11-01 00:00:00
abstract：:In this study, the extraction, identification, and antialgal activity of toxic organic substances from decaying green alga Ulva prolifera, a disaster-causing alga on green tides in the Yellow Sea, were investigated. The toxic organic substances of U. prolifera were isolated by a sequence of procedures, namely, liquid-...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2020.101786
更新日期：2020-03-01 00:00:00
abstract：:Harmful algal blooms are mainly caused by marine dinoflagellates and are known to produce potent toxins that may affect the ecosystem, human activities and health. Such events have increased in frequency and intensity worldwide in the past decades. Numerous processes involved in Global Change are amplified in the Arct...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2016.02.004
更新日期：2016-05-01 00:00:00
abstract：:Recent studies demonstrate that most cyanobacteria produce the neurotoxin beta-N-methylamino-L-alanine (BMAA) and that it can biomagnify in at least one terrestrial food chain. BMAA has been implicated as a significant environmental risk in the development of neurodegenerative diseases such as Alzheimer's disease, Par...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2010.05.002
更新日期：2010-09-01 00:00:00
abstract：:Most harmful algal blooms (HAB) originate away from the shore and, for them to endanger human health, they must be first transported to shore after which they must enter the surf zone where they can be feed upon by filter feeders. The last step in this sequence, entrance into the surf zone, depends on surf zone hydrod...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2016.03.004
更新日期：2016-05-01 00:00:00
abstract：:Taste and odor (T & O) episodes always cause strong effects on drinking water supply system. Luanhe River diversion into Tianjin City in China is an important drinking water resource. Massive growth of a benthic filamentous cyanobacterium with geosmin production in the open canal caused a strong earthy odor episode in...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2017.09.006
更新日期：2017-11-01 00:00:00
abstract：:The brown tides occurring in the coastal scallop cultivation area of Qinhuangdao, China, in recent years are caused by Aureococcus anophagefferens and significantly impact the scallop industry and the marine ecosystem in this region. Long-term investigations of phytoplankton and hydrological variables in the Qinhuangd...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2019.05.011
更新日期：2019-06-01 00:00:00
abstract：:The link between harmful algal blooms, phytoplankton community dynamics and global environmental change is not well understood. To tackle this challenging question, a new method was used to reveal how phytoplankton communities responded to environmental change with the occurrence of an harmful algae, using the coastal...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2017.12.005
更新日期：2018-02-01 00:00:00
abstract：:This work demonstrated a 10-day batch culture experiment to test the physiology and toxicity of harmful dinoflagellate Karenia mikimotoi in response to ocean acidification (OA) under two different phosphate concentrations. Cells were previously acclimated in OA (pH = 7.8 and CO2 = 1100 μatm) condition for about three ...
journal_title：Harmful algae
pub_type： 杂志文章
doi：10.1016/j.hal.2019.101621
更新日期：2019-07-01 00:00:00
