The role of physico-chemical interactions in the seasonality of toxic dinoflagellate cyst assemblages: The case of the NW Patagonian fjords system

Rodríguez-Villegas, Camilo; Díaz, Patricio A.; Salgado, Pablo; Tomasetti, Stephen J.; Díaz, Manuel; Marín, Sandra L.; Baldrich, Ángela M.; Niklitschek, Edwin; Pino, Loreto; Matamala, Thamara; Espinosa, Katherine; Figueroa, Rosa Isabel

doi:10.1016/j.envpol.2022.119901

Cited by 11 publications

(3 citation statements)

References 95 publications

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“…Marine dinoflagellates are one of the major groups of marine phytoplankton with different features in morphology, reproduction, toxin production, and nutrient demand in different waters [1][2][3]. They are important primary producers and indispensable in marine ecosystems, especially in coastal environments [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Dinoflagellate composition and environmental conditions in the Xuan Dai Bay, South-Central Vietnam

Huynh,

Tran,

Tran

et al. 2024

VJMST

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The dinoflagellate community was investigated in association with environmental factors using a data set in April 2021 and April 2022 in Xuan Dai Bay, South-Central Viet Nam. Environmental variables, including physical parameters and dissolved inorganic nutrients, were measured in April 2022. Seventy-three dinoflagellate taxa were identified for Xuan Dai Bay. There was a significant difference in the number and abundance of dinoflagellates between two parts of the bay, the upper and lower bay. The study showed that dinoflagellates favored an area with good water exchange and were less affected by aquaculture activities. Principal component analysis (PCA) was used to explore the relative abundances of different phytoplankton groups, their diversity indices, and environmental variables at the surface and bottom layers of the two parts of the bay. The results showed that dinoflagellates correlated to physical parameters (e.g., PAR, salinity, temperature) at the surface layer and nutrients at the bottom layer. Dinoflagellates and diatoms are mixotrophic and strongly correlated at the bottom layer in Xuan Dai Bay. This strong relationship in the bay was because of the dominance of a heterotrophic genus, Protoperidinium. The present study provided characteristics of the dinoflagellates in Xuan Dai Bay and the possible impacts of environmental parameters on their abundance. The results can be used for further studies and possibly managing of dinoflagellate blooms in coastal waters.

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Section: Introductionmentioning

confidence: 99%

“…Journal of MarineSystems, 73(3)(4), 323-337. doi: 10.1016/ j.jmarsys.2006.10.012 [14] Li, Y., Lü, S., Jiang, T., Xiao, Y., and You, S., 2011. Environmental factors and seasonal dynamics of Prorocentrum populations in Nanji Islands National Nature Reserve, East China Sea.…”

mentioning

confidence: 99%

Dinoflagellate composition and environmental conditions in the Xuan Dai Bay, South-Central Vietnam

Huynh,

Tran,

Tran

et al. 2024

VJMST

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“…Among the bloom-forming species of concern is toxin-producing Alexandrium catenella , responsible for paralytic shellfish poisoning (PSP), which has been geographically expanding from south to north, blooming in previously unaffected areas. Moreover, this expansion is being consolidated in the sediments of these new areas, where resting stages of this species have been found, guaranteeing a “seed bank” for potential new blooms [ 3 , 4 , 5 , 6 ]. Changing climatic conditions and increasing water temperatures are expected to promote the expansion of A. catenella [ 7 , 8 ] and of other ichthyotoxic species, such as Heterosigma akashiwo and Pseudochattonella verruculosa , outbreaks of which have also occurred under conditions associated with climate change [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Toxic Algal Bloom Recurrence in the Era of Global Change: Lessons from the Chilean Patagonian Fjords

Díaz

Figueroa

2023

Microorganisms

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Toxic and harmful algal blooms (HABs) are a global problem affecting human health, marine ecosystems, and coastal economies, the latter through their impact on aquaculture, fisheries, and tourism. As our knowledge and the techniques to study HABs advance, so do international monitoring efforts, which have led to a large increase in the total number of reported cases. However, in addition to increased detections, environmental factors associated with global change, mainly high nutrient levels and warming temperatures, are responsible for the increased occurrence, persistence, and geographical expansion of HABs. The Chilean Patagonian fjords provide an “open-air laboratory” for the study of climate change, including its impact on the blooms of several toxic microalgal species, which, in recent years, have undergone increases in their geographical range as well as their virulence and recurrence (the species Alexandrium catenella, Pseudochattonella verruculosa, and Heterosigma akashiwo, and others of the genera Dinophysis and Pseudo-nitzschia). Here, we review the evolution of HABs in the Chilean Patagonian fjords, with a focus on the established connections between key features of HABs (expansion, recurrence, and persistence) and their interaction with current and predicted global climate-change-related factors. We conclude that large-scale climatic anomalies such as the lack of rain and heat waves, events intensified by climate change, promote the massive proliferation of these species by creating ideal conditions for their growth and persistence, as they affect water-column stratification, nutrient inputs, and reproductive rates.

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Small and patchy is enough: An example about how toxic HAB events can spread through low resting cyst loads

Rodríguez-Villegas,

Figueroa,

Baldrich

et al. 2023

Harmful Algae

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The role of physico-chemical interactions in the seasonality of toxic dinoflagellate cyst assemblages: The case of the NW Patagonian fjords system

Cited by 11 publications

References 95 publications

Dinoflagellate composition and environmental conditions in the Xuan Dai Bay, South-Central Vietnam

Dinoflagellate composition and environmental conditions in the Xuan Dai Bay, South-Central Vietnam

Toxic Algal Bloom Recurrence in the Era of Global Change: Lessons from the Chilean Patagonian Fjords

Small and patchy is enough: An example about how toxic HAB events can spread through low resting cyst loads

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