Efecto de factores abióticos en el crecimiento vegetativo de Alexandrium catenella proveniente de quistes en laboratorio

Avila, Marcela; Zarate, Constanza De; Clément, Alejandro; Carbonell, Pamela; Pérez, Felipe

doi:10.4067/s0718-19572015000200004

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…However, frequency of A. catenella blooms in the northwestern Chilean Inland Sea was weakly associated with lower temperatures but not with salinity (Díaz et al, 2014). Cultures of A. catenella isolated from Patagonian waters and maintained under controlled conditions have also shown complex relationships between temperature/salinity, growth rate and cell yields (Uribe et al, 2010;Aguilera-Belmonte et al, 2013;Avila et al, 2015). The optimal growth of Chilean strains of A. catenella (i.e., highest growth rate and highest maximal cell density) was reached within a narrow thermal range (12-15 • C), while optimal growth salinity (20-30) showed a broader range (Paredes-Mella et al, 2020).…”

Section: Oceanic and Climatic Influence?mentioning

confidence: 99%

Blooms of Alexandrium catenella in Coastal Waters of Chilean Patagonia: Is Subantarctic Surface Water Involved?

2021

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At the southern tip of South America, evidence of shellfish toxicity has been recorded in the accounts of early explorers and shipwreck survivors since the late 16th Century. Blooms of the toxic dinoflagellate Alexandrium catenella were described in the western Magellan Strait in the early 1970s and have since shown a northward progression through Chilean Patagonia, culminating in a catastrophic toxic event around Chiloé Island in 2016. This shift has taken place through coastal areas of extremely sparse human population density, and anthropogenically driven eutrophication is therefore unlikely to be significantly involved, at least in the south. However, human activities – such as salmon cultivation – may play a role in the intensification of blooms in the more densely populated areas of northern Patagonia. In the fjords and channels of Chilean Patagonia, phytoplankton assemblages are shaped by complex interactions between freshwater (FW) run-off and intrusions of subantarctic surface water (SASW). In the context of blooms of A. catenella, we review the properties of SASW – transformed in coastal waters into modified subantarctic water (MSAW). FW input is characterized by very low concentrations of dissolved inorganic nitrogen (DIN) and phosphorus (DIP), but relatively high concentrations of silicic acid (DSi); DIN and DIP are instead supplied predominantly by SASW which is severely deficient in DSi. These waters therefore show strong vertical gradients in DIN, DIP and DSi, but also potentially in dissolved trace metals and CO2. Large scale shifts in the relative inputs of SASW or FW can modify these vertical gradients, potentially forcing competitive changes in phytoplankton assemblages with latitude, with implications for growth and toxicity of A. catenella and other harmful species. The northward shift of blooms of A. catenella could be associated with anomalies in the Southern Annular Mode (SAM) that modify the influence of MSAW through variations in FW input to coastal waters. The historical presence of blooms in southern Patagonia and Tierra del Fuego, combined with the strongly contrasting conditions with latitude and depth, mean that southern Chile represents an ideal natural laboratory to study climatic and oceanographic influences on dynamics of A. catenella populations.

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Section: Oceanic and Climatic Influence?mentioning

confidence: 99%

Blooms of Alexandrium catenella in Coastal Waters of Chilean Patagonia: Is Subantarctic Surface Water Involved?

2021

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“…The effect of temperature, salinity, L:D cycle, cyst or vegetative strains, and nutrients on the growth of A. catenella from diverse regions of Chile have been determined (Table 4) (Navarro et al, 2006;Aguilera-Belmonte et al, 2011Ávila et al, 2015). In general, this species tolerates temperatures between 10 and 16 • C, producing cell concentrations above 50,000 cell mL −1 at 15 • C with growth rates from 0.54 to 0.73 div day −1 (Navarro et al, 2006;Aguilera-Belmonte et al, 2011; indicating that growth is temperature-dependent.…”

Section: Alexandrium Catenellamentioning

confidence: 99%

Paralytic Toxin Producing Dinoflagellates in Latin America: Ecology and Physiology

et al. 2019

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In this review we summarize the current state of knowledge regarding taxonomy, bloom dynamics, toxicity, autoecology, and trophic interactions, of saxitoxin producing dinoflagellates in this region. The dinoflagellates Gymnodinium catenatum, Pyrodinium bahamense and several species of Alexandrium are saxitoxin producers, and have been responsible of paralytic shellfish poisoning in different regions of Latin America, causing intoxications and important fisheries losses. The species distribution differ; most harmful algal blooms of G. catenatum are from the northern region, however this species has also been reported in central and southern regions. Blooms of P. bahamense are mostly reported in North and Central America, while blooms of Alexandrium species are more common in South America, however this genus is widely spread in Latin America. Species and regional differences are contrasted, with the aim to contribute to future guidelines for an international scientific approach for research and monitoring activities that are needed to increase our understanding of paralytic toxin producing dinoflagellates in this region.

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Quantifying harmful algal bloom thresholds for farmed salmon in southern Chile

et al. 2018

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Efecto de factores abióticos en el crecimiento vegetativo de Alexandrium catenella proveniente de quistes en laboratorio

Cited by 5 publications

References 15 publications

Blooms of Alexandrium catenella in Coastal Waters of Chilean Patagonia: Is Subantarctic Surface Water Involved?

Blooms of Alexandrium catenella in Coastal Waters of Chilean Patagonia: Is Subantarctic Surface Water Involved?

Paralytic Toxin Producing Dinoflagellates in Latin America: Ecology and Physiology

Quantifying harmful algal bloom thresholds for farmed salmon in southern Chile

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