Image-derived indicators of phytoplankton community responses to Pseudo-nitzschia blooms - Institut de la mer de Villefranche
Article Dans Une Revue Harmful Algae Année : 2024

Image-derived indicators of phytoplankton community responses to Pseudo-nitzschia blooms

Résumé

Phytoplankton populations in the natural environment interact with each other. Despite rising global concern with Pseudo-nitzschia blooms, which can produce the potent neurotoxin domoic acid, we still do not fully understand how other phytoplankton genera respond to the presence of Pseudo-nitzschia. Here, we used a 4-year high-resolution imaging dataset for 9 commonly found phytoplankton genera in Narragansett Bay, alongside environmental data, to identify potential interactions between phytoplankton genera and their response to elevated Pseudo-nitzschia abundance. Our results indicate that Pseudo-nitzschia tends to bloom either concurrently with or right after other phytoplankton genera. Such bloom periods coincide with higher water temperatures and lower salinity. Pseudo-nitzschia image abundance tends to increase the most from March-May and peaks during May-Jun, whereas the image-derived biovolume and width of Pseudo-nitzschia chains increase the most during Jan-Feb. For most phytoplankton genera, their relationship with Pseudo-nitzschia abundance is noticeably different from their relationship with Pseudo-nitzschia image features. Despite the complexity in the phytoplankton community, our analysis suggests several ecological indicators that may be used to determine the risk of harmful algal blooms.
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hal-04681007 , version 1 (30-08-2024)

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Vitul Agarwal, Virginie Sonnet, Keisuke Inomura, Audrey Ciochetto, Colleen Mouw. Image-derived indicators of phytoplankton community responses to Pseudo-nitzschia blooms. Harmful Algae, 2024, 138, pp.102702. ⟨10.1016/j.hal.2024.102702⟩. ⟨hal-04681007⟩
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