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Nutrient supply controls picoplankton community structure during three contrasting seasons in the northwestern Mediterranean Sea

Nutrient supply controls picoplankton community structure during three contrasting seasons in the northwestern Mediterranean Sea
Nutrient supply controls picoplankton community structure during three contrasting seasons in the northwestern Mediterranean Sea
We investigated the influence of ocean mixing and nutrient supply dynamics on picoplankton community composition in the context of Margalef's Mandala (Margalef 1978). Simultaneous measurements of microturbulence, nutrient concentration, and autotrophic and heterotrophic picoplankton properties, were collected during 3 cruises carried out in the northwestern Mediterranean Sea in March (F1), April/May (F2) and September (F3) 2009. The 3 cruises sampled different oceanographic conditions, starting with early stages of the late winter-early spring bloom, followed by the late stage of the bloom, and finally summer stratification. As a result of the variability in vertical diffusivity and the nitrate gradient across the nitracline, nitrate vertical fluxes were higher during F1 (23 ± 35 mmol m-2 d-1), compared to F2 (0.4 ± 0.2 mmol m-2 d-1) and F3 (0.09 ± 0.09 mmol m-2 d-1). Prochlorococcus abundance was low when nitrate supply was high, Synechococcus exhibited the highest abundances at intermediate levels of nitrate supply and highest irradiance during F2, and large and small picoeukaryotic groups increased their abundance under high nutrient supply in F1. No significant relationships between the abundance of high and low nucleic acid heterotrophic bacteria and nitrate supply were found. In agreement with Margalef's model, our results show different responses of picophytoplankton groups to nitrate supply (probably reflecting differences in nutrient uptake abilities), and that the ratio of prokaryotic to picoeukaryotic photoautotrophic biomass decreases with increasing nitrate supply.
Margalef's Mandala, Mediterranean Sea, Nutrient supply, Picoplankton, Turbulence
0171-8630
Mouriño-Carballido, Beatriz
1bfd941d-9ec6-473f-94bd-bb6faac56fa5
Hojas, Elena
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Cermeño, Pedro
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Chouciño, Paloma
b0ebda43-f5f6-4c1a-a710-520be10023cd
Fernández-Castro, Bieito
8017e93c-d5ee-4bba-b443-9c72ca512d61
Latasa, Mikel
e8f88d8c-49e2-4e11-9ec1-a5f9b173a2fd
Marañón, Emilio
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Morán, Xosé Anxelu G.
ea2ef57b-b1e3-4e86-80f0-3feeabef355b
Vidal, Montserrat
00ed9d5f-e097-4e37-a0a4-012e0e4283ca
Mouriño-Carballido, Beatriz
1bfd941d-9ec6-473f-94bd-bb6faac56fa5
Hojas, Elena
87e980cc-e6e7-4eac-a92c-688b017d63ad
Cermeño, Pedro
c179b90c-98ed-48c9-9d0b-67ad75c971e5
Chouciño, Paloma
b0ebda43-f5f6-4c1a-a710-520be10023cd
Fernández-Castro, Bieito
8017e93c-d5ee-4bba-b443-9c72ca512d61
Latasa, Mikel
e8f88d8c-49e2-4e11-9ec1-a5f9b173a2fd
Marañón, Emilio
c1799c8b-0849-400f-88c3-7ba064feff5c
Morán, Xosé Anxelu G.
ea2ef57b-b1e3-4e86-80f0-3feeabef355b
Vidal, Montserrat
00ed9d5f-e097-4e37-a0a4-012e0e4283ca

Mouriño-Carballido, Beatriz, Hojas, Elena, Cermeño, Pedro, Chouciño, Paloma, Fernández-Castro, Bieito, Latasa, Mikel, Marañón, Emilio, Morán, Xosé Anxelu G. and Vidal, Montserrat (2016) Nutrient supply controls picoplankton community structure during three contrasting seasons in the northwestern Mediterranean Sea. Marine Ecology Progress Series, 543. (doi:10.3354/meps11558).

Record type: Article

Abstract

We investigated the influence of ocean mixing and nutrient supply dynamics on picoplankton community composition in the context of Margalef's Mandala (Margalef 1978). Simultaneous measurements of microturbulence, nutrient concentration, and autotrophic and heterotrophic picoplankton properties, were collected during 3 cruises carried out in the northwestern Mediterranean Sea in March (F1), April/May (F2) and September (F3) 2009. The 3 cruises sampled different oceanographic conditions, starting with early stages of the late winter-early spring bloom, followed by the late stage of the bloom, and finally summer stratification. As a result of the variability in vertical diffusivity and the nitrate gradient across the nitracline, nitrate vertical fluxes were higher during F1 (23 ± 35 mmol m-2 d-1), compared to F2 (0.4 ± 0.2 mmol m-2 d-1) and F3 (0.09 ± 0.09 mmol m-2 d-1). Prochlorococcus abundance was low when nitrate supply was high, Synechococcus exhibited the highest abundances at intermediate levels of nitrate supply and highest irradiance during F2, and large and small picoeukaryotic groups increased their abundance under high nutrient supply in F1. No significant relationships between the abundance of high and low nucleic acid heterotrophic bacteria and nitrate supply were found. In agreement with Margalef's model, our results show different responses of picophytoplankton groups to nitrate supply (probably reflecting differences in nutrient uptake abilities), and that the ratio of prokaryotic to picoeukaryotic photoautotrophic biomass decreases with increasing nitrate supply.

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e-pub ahead of print date: 3 February 2016
Keywords: Margalef's Mandala, Mediterranean Sea, Nutrient supply, Picoplankton, Turbulence

Identifiers

Local EPrints ID: 453893
URI: http://eprints.soton.ac.uk/id/eprint/453893
ISSN: 0171-8630
PURE UUID: 7feef6e7-b351-4245-a706-57edd521aa68
ORCID for Bieito Fernández-Castro: ORCID iD orcid.org/0000-0001-7797-854X

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Date deposited: 25 Jan 2022 17:45
Last modified: 08 Jun 2022 01:59

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Contributors

Author: Beatriz Mouriño-Carballido
Author: Elena Hojas
Author: Pedro Cermeño
Author: Paloma Chouciño
Author: Mikel Latasa
Author: Emilio Marañón
Author: Xosé Anxelu G. Morán
Author: Montserrat Vidal

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