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• W4308986899 endingPage "102921" @default.
• W4308986899 startingPage "102921" @default.
• W4308986899 abstract "The Patagonian fjords have experienced intense harmful algal blooms (HABs) in the last decade, affecting important aquaculture areas in southern Chile. Climatic anomalies have recently triggered ‘super blooms’ of opportunistic toxic microalgal genera, especially due to persistent thermal stratification which likely provides an optimal niche for HABs development in fjord systems. In March-April 2021, an intense and widespread bloom of the raphidophyte Heterosigma akashiwo caused high salmon mortalities (>6,000 t) in the Comau fjord, Los Lagos Region. A climate variability analysis showed the effects of the positive phase of the Southern Annular Mode (SAM > 1.2 hPa) overcame those of La Niña (Niño3.4 = -0.9 °C) leading to an intense drought on the northern part of Patagonia with record low rainfall (the 2nd driest summer in the last 70 years) and increased water temperature. A regional satellite analysis revealed an extreme and persistent shallow Mixed Layer Depth (MLD) during summer periods since 2019 within the inland seas. In situ vertical fine-resolution measurements during the bloom event showed high cell abundances in the first 3 m of the water column (max. ∼ 70,000 cells mL−1), associated with warmer water temperature (∼15.5 – 17.5 °C), low salinity (∼25–30 psu), moderate to high dissolved oxygen (5 – 8.5 mg/L) and extremely high fluorescence signals in dense superficial cell aggregations (max. 74.9 µg/L). A 18S rRNA metabarcoding analysis formally confirmed the presence of H. akashiwo and its almost monospecific bloom development at the water surface. HPLC pigment analysis showed the carotenoid fucoxanthin in high proportion (48.8 %) compared to other photosynthetic pigments, becoming a potential pigment biomarker for early satellite H. akashiwo detection. Cell growth and cytotoxic in vitro experiments revealed high phenotypic plasticity of Chilean H. akashiwo against sudden changes in salinity. An RTgill-W1 gill cell assay revealed high cytotoxic activity (viability down to ∼ 50 – 30 % of controls) only at high cell abundances (>40,000H. akashiwo cells mL−1), which was in accordance with histological examination of moribund salmon that showed gill damage and circulatory disorders mainly due to long-term exposure to hypoxic conditions and not to potent cytotoxic effects. The Party-MOSA particles dispersion model revealed a high retention of water masses within the Comau fjord during the H. akashiwo outbreak, a scenario that may have boosted fish kills due to enhanced cells patchiness, ichthyotoxins persistence and hypoxic conditions. A historical dissolved inorganic nutrient data analysis showed that inner Patagonian fjords maintain low N and P concentrations including those environments considered of high eutrophication risk. Low N:P (<16:1) ratios measured at Comau fjord during the 2021 suggests that toxic flagellates growth could be favored over diatoms; however, low N:Si (<1:1 – N deficiency) evidences a clear need for better understanding of the role of mixotrophy in the persistence of the 2021H. akashiwo bloom for several weeks. These results highlight the fact that HABs responses against climate drivers and potential eutrophication are not universal and need to be assessed yearly and locally, particularly because extreme droughts and intensive aquaculture in northern Patagonia are expected to continue throughout the 21st century." @default.
• W4308986899 created "2022-11-20" @default.
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• W4308986899 date "2023-01-01" @default.
• W4308986899 modified "2023-10-18" @default.
• W4308986899 title "Extreme harmful algal blooms, climate change, and potential risk of eutrophication in Patagonian fjords: Insights from an exceptional Heterosigma akashiwo fish-killing event" @default.
• W4308986899 cites W1640292837 @default.
• W4308986899 cites W1855339574 @default.
• W4308986899 cites W1872237796 @default.
• W4308986899 cites W1904781970 @default.
• W4308986899 cites W1914782372 @default.
• W4308986899 cites W1965604900 @default.
• W4308986899 cites W1967295423 @default.
• W4308986899 cites W1969072475 @default.
• W4308986899 cites W1976739259 @default.
• W4308986899 cites W1979152490 @default.
• W4308986899 cites W1984043851 @default.
• W4308986899 cites W1984285357 @default.
• W4308986899 cites W1984457321 @default.
• W4308986899 cites W1994867647 @default.
• W4308986899 cites W2000216577 @default.
• W4308986899 cites W2004888940 @default.
• W4308986899 cites W2005911513 @default.
• W4308986899 cites W2006688677 @default.
• W4308986899 cites W2013588816 @default.
• W4308986899 cites W2015915918 @default.
• W4308986899 cites W2020624512 @default.
• W4308986899 cites W2021855981 @default.
• W4308986899 cites W2022638219 @default.
• W4308986899 cites W2033829073 @default.
• W4308986899 cites W2038896901 @default.
• W4308986899 cites W2040689391 @default.
• W4308986899 cites W2042006876 @default.
• W4308986899 cites W2051073779 @default.
• W4308986899 cites W2053273950 @default.
• W4308986899 cites W2058914669 @default.
• W4308986899 cites W2059197393 @default.
• W4308986899 cites W2061413830 @default.
• W4308986899 cites W2062843945 @default.
• W4308986899 cites W2063277868 @default.
• W4308986899 cites W2066758597 @default.
• W4308986899 cites W2070429449 @default.
• W4308986899 cites W2073834256 @default.
• W4308986899 cites W2075326754 @default.
• W4308986899 cites W2077059665 @default.
• W4308986899 cites W2077163522 @default.
• W4308986899 cites W2080823382 @default.
• W4308986899 cites W2090185669 @default.
• W4308986899 cites W2091112280 @default.
• W4308986899 cites W2092122980 @default.
• W4308986899 cites W2102634271 @default.
• W4308986899 cites W2103296919 @default.
• W4308986899 cites W2118812765 @default.
• W4308986899 cites W2124565737 @default.
• W4308986899 cites W2131919423 @default.
• W4308986899 cites W2134877126 @default.
• W4308986899 cites W2137015675 @default.
• W4308986899 cites W2145506695 @default.
• W4308986899 cites W2148633086 @default.
• W4308986899 cites W2152473128 @default.
• W4308986899 cites W2158205825 @default.
• W4308986899 cites W2168916838 @default.
• W4308986899 cites W2173251738 @default.
• W4308986899 cites W2179080957 @default.
• W4308986899 cites W2264618847 @default.
• W4308986899 cites W2317983011 @default.
• W4308986899 cites W2401404581 @default.
• W4308986899 cites W2410782170 @default.
• W4308986899 cites W2546835608 @default.
• W4308986899 cites W2751385606 @default.
• W4308986899 cites W2782951156 @default.
• W4308986899 cites W2783482278 @default.
• W4308986899 cites W2788379540 @default.
• W4308986899 cites W2811276287 @default.
• W4308986899 cites W2903890181 @default.
• W4308986899 cites W2914093843 @default.
• W4308986899 cites W2943192541 @default.
• W4308986899 cites W2943633724 @default.
• W4308986899 cites W2950674490 @default.
• W4308986899 cites W2963158293 @default.
• W4308986899 cites W2990962578 @default.
• W4308986899 cites W2996378224 @default.
• W4308986899 cites W3022410926 @default.
• W4308986899 cites W3080593679 @default.
• W4308986899 cites W3093821945 @default.

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