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Ulvaria obscura is a common marine algae, typically identified in algal blooms referred to as "Green Tides". [3] [4] The species is distinct in its ability to produce the neurotransmitter dopamine as a herbivore defense mechanism.
The green tides caused by the overgrowth of Ulva prolifera in the Yellow Sea of China have been occurring every summer since 2007. The green tide is a major environmental concern that involves the impacts from natural, anthropogenic, physicochemical and algae factors along with the warming of local water.
Green tide, a phenomenon of excessive green algae in a certain area, is mainly caused by Ulva spp. [22] In Jeju Island and its coastal areas of South Korea, Ulva australis, a specie of Ulva spp., has caused serious ecological and marine pollution. Therefore, it is imminent to resolve the issue.
Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, sometimes called a red tide in marine environments, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to ...
McFeeters index: If looking for water bodies or change in water level (e.g. flooding), then it is advisable to use the green and NIR spectral bands [18] or green and SWIR spectral bands. Modification of normalised difference water index (MNDWI) has been suggested for improved detection of open water by replacing NIR spectral band with SWIR. [19]
Although most contemporary ulvophytes are marine macroalgae , ancestral ulvophytes may have been freshwater, unicellular green algae. Molecular phylogenetic evidence suggests that macroscopic growth was achieved independently in the various major lineages of Ulvophyceae ( Ulvales - Ulotrichales , Trentepohliales , Cladophorales , Bryopsidales ...
English: A schematic of the water surface level changes with the tides. Average low water spring or average low water neap tide; used as a reference, which one is used depends on whether LWN or LWS is lowest. The schematic was hand drawn based on an image from the book "Leidraad voor het Stuurbrevet" by Richard Vooren, Paul Van den Keybus.
Water-borne diseases are also present as our drinking waters can be contaminated by cyanotoxins. If the HAB event results in a high enough concentration of algae the water may become discoloured or murky, varying in colour from purple to almost pink, normally being red or green. Not all algal blooms are dense enough to cause water discolouration.