Impact of anoxia and oyster mortality on nutrient and microbial planktonic components: A mesocosm study

Ray, Le; Bec,; Fiandrino,; Lagarde, Emmanuel; Cimiterra,; Raimbault, Vincent; Roques,; Rigaud,; Régis,; Mostajir,; Mas,; Richard, Richard

doi:10.1016/j.aquaculture.2022.739171

Cited by 1 publication

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“…Therefore, the findings of the present study suggest that consecutive HWs could result in short-term (a timescale of a few days) deoxygenation of the water column. This could contribute to the strengthening of hypoxic and/or anoxic events that have already occurred in Mediterranean coastal lagoons 52 , 53 .…”

Section: Discussionmentioning

confidence: 99%

Functional and structural responses of plankton communities toward consecutive experimental heatwaves in Mediterranean coastal waters

Soulié

Vidussi

Mas

et al. 2023

Sci Rep

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The frequency of marine heatwaves (HWs) is projected to increase in the Mediterranean Sea over the next decades. An in situ mesocosm experiment was performed in a Mediterranean lagoon for 33 days. Three mesocosms were used as controls following the natural temperature of the lagoon. In three others, two HWs of + 5 °C compared to the controls were applied from experimental day (d) 1 to d5 (HW1) and from d11 to d15 (HW2). High-frequency data of oxygen, chlorophyll-a (chl-a), temperature, salinity and light from sensors immersed in all mesocosms were used to calculate gross primary production (GPP), respiration (R) and phytoplankton growth (µ) and loss (L) rates. Nutrients and phytoplankton community structure from pigments were also analyzed. HW1 significantly increased GPP, R, chl-a, µ and L by 7 to 38%. HW2 shifted the system toward heterotrophy by only enhancing R. Thus, the effects of the first HW resulted in the attenuation of those of a second HW on phytoplankton processes, but not on community respiration, which was strongly regulated by temperature. In addition, natural phytoplankton succession from diatoms to haptophytes was altered by both HWs as cyanobacteria and chlorophytes were favored at the expense of haptophytes. These results indicate that HWs have pronounced effects on Mediterranean plankton communities.

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Section: Discussionmentioning

confidence: 99%