Publications by authors named "Guido Mancilla-Gutierrez"
Article Synopsis
- Harmful algal blooms (HABs), especially those from toxin-producing microalgae like Prorocentrum micans, are a recurring issue in Patagonian fjords, and a significant HB-HAB occurred in Northwest Chilean Patagonia during February-March 2022.
- Observations showed a dramatic increase in P. micans cell density from low levels in January to a peak of over 8.3 x 10 cells/mL by mid-February, associated with warmer sea temperatures and varying salinity.
- Satellite images and oceanographic modeling revealed that water currents and temperature variations in the Gulf of Ancud supported the development and maintenance of this harmful algal bloom, indicating a hotspot for both HABs and HB-HAB
Article Synopsis
- There has been a global increase in Harmful Algae Blooms (HABs) over recent decades, linked to environmental exploitation, enhanced monitoring, and rising maritime transport.
- HAB species, such as those causing paralytic shellfish poisoning and producing yessotoxins, pose serious public health and socioeconomic risks.
- Recent observations in the Biobio region suggest a northward movement of these HABs into more open waters, with studies indicating that factors like deep-water turbulence and the presence of toxic resting cysts could trigger harmful events in the environment.
Protoceratium reticulatum is the main yessotoxin-producer along the Chilean coast. Thus far, the yessotoxin levels recorded in this region have not posed a serious threat to human health. However, a bloom of P.
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- * In March 2021, H. akashiwo caused heavy salmon mortality in Comau Fjord, with nearly 6000 tons of biomass lost in just 15 days, driven by a bloom reaching extremely high cell densities.
- * Environmental factors, including high-pressure systems, dry conditions, and local hydrodynamics in the fjord, played a crucial role in the development and intensity of this harmful algal bloom.
Fish-killing blooms of Heterosigma akashiwo and Pseudochattonella verruculosa have been devastating for the farmed salmon industry, but in Southern Chile the conditions that promote the growth and toxicity of these microalgae are poorly understood. This study examined the effects of different combinations of temperature (12, 15, 18 °C) and salinity (10, 20, 30 psu) on the growth of Chilean strains of these two species. The results showed that the optimal growth conditions for H.
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