BIOTOXINAS MARINAS PDF
Centro de Investigación y Control de la Calidad (CICC) · Centro Nacional de Alimentación (CNA); Laboratorio Nacional de Referencia de Biotoxinas Marinas. Actividades del Laboratorio Comunitario de Referencia de Biotoxinas Marinas. In : Avances y Tendencias en Fitoplancton Tóxino y Biotoxinas (ISBN. XIII Reunión Ibérica de Algas Tóxicas y biotoxinas marinas Vigo (Spain), th June CLIMATE CHANGE DRIVERS IMPACTS.
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These toxins are secondary metabolites with no explicit role in the internal economy of the organisms that produce them and with very specific activities in mammals.
Furthermore, there are micro-algal species about 75 which have the mqrinas to produce potent toxins called phycotoxins that can find their way through levels of the food chain e. These cysts sink to the bottom of the sea and accumulate at the borderline of water and sediment where marunas over-winter.
Shellfish grazing on these algae can accumulate the toxins but the shellfish itself is rather resistant to the harmful effects of these toxins. The second group, neutral toxins, consists of polyether-lactones of the pectenotoxin group PTXs. This diatom was consumed by anchovies that in turn were eaten by the birds.
Principales biotoxinas marinas, fuente de exposición y toxin by Samatha Benavides on Prezi
There are no reasons to assume that shellfish intoxication can be predicted by the properties of the regional area. The PSP toxins are produced mainly by dinoflagellates belonging to the genus Alexandrium, which may occur both in the tropical and moderate climate zones. Most regulations are set for PSP toxins as a group.
These neurotoxic symptoms were quite different from typical DSP biootxinas Satake et al.
DSP incidences, or at least the presence of DSP toxins, appear to be increasing biotoixnas DSP toxins producing algae and toxic bivalves are frequently reported from new areas. The explosive growths sometimes appear during changes in weather conditions but important contributing causes may be variations in upwellings, temperature, transparency, turbulence or salinity of the water, the concentration of dissolved nutrients, wind or surface illumination Bower et al.
The most important marine phycotoxins are shellfish toxins and ciguatoxins.
Ciguatera fish poisoning CFP has been known for centuries. Fast-growing algae quickly strip away nutrients in the upper layer, leaving nitrogen maginas phosphorus only below the interface of the layers, called the pycnocline. Other algal species can be harmful to fish and invertebrates especially in intensive aquaculture systems by damaging or clogging their gills. In Octoberextracts of razor clams from the coast of Oregon were found to induce DA acid-like symptoms in mice.
In the past, the ciguatera food poisoning in humans was highly localized to coastal, often island communities of indigenous peoples.
The known organisms producing DSP toxins were not observed in water samples collected at that time. In general, red tides often occur when heating or freshwater runoff creates a stratified surface layer above colder, nutrient-rich waters. Neurologic or neurotoxic shellfish poisoning Marinaz is caused by polyether brevetoxins produced by the unarmoured dinoflagellateGymnodinium breve also called Ptychodiscus breve, since called Karenia brevis.
These marinxs prompted the biotoxinad authorities in the United States to conduct a massive survey of many marine species for the presence of DA. However, as yet it is unclear whether the increase is real, whether it could be a marinaz of improved identification, detection and medical registration, or whether it is due to expanded shellfish culture and consumption. DSP symptoms are diarrhoea, nausea, vomiting and abdominal pain starting 30 minutes to a few hours after ingestion and complete recovery occurs within three days.
At this time, ASP caused three deaths and cases of acute human poisoning following the consumption of blue mussels. Some species produce basically harmless water discolorations. The number of dinoflagellate cells per litre of water needed to contaminate shellfish is also variable.
Boitoxinas earlymore than human shellfish poisonings were reported from New Zealand caused by an organism similar to G. Ina major Florida bloom event was dispersed by the Gulf Stream northward into North Carolina waters where it has since continued to be present.
However, with the increases in seafood trade, increased worldwide seafood consumption and international tourism, the target populations have become international. It is not clear why some micro-algal species produce toxins. At present, ciguatera is the most common type of marine food poisoning worldwide and, with an estimated 10 to 50 people worldwide suffering from the disease annually, it constitutes a global health problem De Fouw et al.
However, mid-water exchange within regional seas for example the North Sea, Irish Sea or English Channel is less efficient than within oceanic waters.
Symptoms of human PSP intoxication vary from a slight tingling or numbness to complete respiratory paralysis. It was then that azaspiracid formerly called Killary Toxin-3 or KT3 was identified and the new toxic syndrome was called azaspiracid poisoning AZP.
Until now, five groups of shellfish toxins have been distinguished, namely:. The conditions for an algal bloom are not yet fully elucidated but the phenomenon is probably influenced by climatic and hydrographic circumstances Van Egmond and Speijers, Some algal species already produce toxins at low abundances of some hundreds of cells per litre, while other algal species mrinas occur in some millions of cells per litre in order to cause any harm.
The symptoms included abdominal cramps, vomiting, disorientation and memory loss amnesia. The toxin was found widely from California to Washington, and was also found unexpectedly in crabs, the first time this toxin was demonstrated in a crustacean. In addition, a slowly progressing paralysis was observed in the mouse assay using the mussel extracts. It is even possible that algal species which are normally not toxic may be rendered toxic when exposed to atypical nutrient regimes e.
The transportation of dinoflagellate resting cysts, especially from paralytic shellfish poisoning toxin producers McMinn et al. DSP toxins can be divided into different groups depending on chemical structure. Acid precipitation can further increase the mobility of humic substances and trace metals in soils Hallegraeff, Since these incidents, global awareness of DA and viotoxinas producing sources has been raised Wright and Quilliam, Incomplete elimination of harmful organisms is caused by the incomplete discharge of water and sediments in the ballast tank during reballasting Zhang and Dickman, During the last 20 years, there seems to have been an increase in intoxications caused by PSP.
An unusual feature of Gymnodinium breve is bitoxinas formation by wave action of toxic aerosols which can lead to asthma-like symptoms in humans.