Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton
We examined the response of North Atlantic plankton population dynamics to rapid re-stratification of surface waters following a deep mixing event during spring. Over the 4-day occupation of a station, we measured phytoplankton growth and grazer/virus-induced mortality rates in dilution assays condu...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1722 2024-09-15T18:23:04+00:00 Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton Morison, Francoise Harvey, Elizabeth Franzè, Gayantonia Menden-Deuer, Susanne 2019-09-01T07:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/755 https://doi.org/10.3389/fmars.2019.00608 https://digitalcommons.uri.edu/context/gsofacpubs/article/1722/viewcontent/fmars_06_00608.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/755 doi:10.3389/fmars.2019.00608 https://digitalcommons.uri.edu/context/gsofacpubs/article/1722/viewcontent/fmars_06_00608.pdf http://creativecommons.org/licenses/by/4.0/ Graduate School of Oceanography Faculty Publications text 2019 ftunivrhodeislan https://doi.org/10.3389/fmars.2019.00608 2024-08-21T00:09:33Z We examined the response of North Atlantic plankton population dynamics to rapid re-stratification of surface waters following a deep mixing event during spring. Over the 4-day occupation of a station, we measured phytoplankton growth and grazer/virus-induced mortality rates in dilution assays conducted across a range of light intensities. Rates were estimated from changes in chlorophyll a and the abundance of three phytoplankton groups identified by flow cytometry. Initially, biological and physical water column properties were homogeneous down to >200 m, followed by rapid shoaling of the mixed layer to 20–30 m. Initial in situ chlorophyll a concentration was 0.4 μg L–1, and phytoplankton biomass accumulated at an average rate of 0.4 d–1 over the next 2 days. When mixed layer depth was maximal, there were no mortality losses and phytoplankton growth rates increased with increased light intensity. After shoaling, grazing rates increased, but never matched the magnitude of phytoplankton growth rates. When the mixed layer was shallowest, growth rates exceeded >1 d–1 at all non-dark light intensities. Chlorophyll a based grazing rates were consistent across light levels (∼0.3 d–1) and were highest on Synechococcus (0.3–0.6 d–1) and lowest on pico-eukaryotes (∼0.2 d–1). The delay with which grazing resumed resulted in growth exceeding losses and consumption of an average of 30% of primary production. Virus-induced mortality rates were minimal across all mixing profiles and light intensities. Overall, both chlorophyll a and group-specific phytoplankton accumulation rates predicted from the shipboard experiments matched those in situ, suggesting that incubation conditions faithfully captured the growth and loss processes governing in situ population dynamics. The observations made here indicate that transient deepening of the mixed layer followed by rapid stratification provided conditions under which phytoplankton escape protistan grazing and accumulate biomass. During the physically ... Text North Atlantic University of Rhode Island: DigitalCommons@URI Frontiers in Marine Science 6 |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
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description |
We examined the response of North Atlantic plankton population dynamics to rapid re-stratification of surface waters following a deep mixing event during spring. Over the 4-day occupation of a station, we measured phytoplankton growth and grazer/virus-induced mortality rates in dilution assays conducted across a range of light intensities. Rates were estimated from changes in chlorophyll a and the abundance of three phytoplankton groups identified by flow cytometry. Initially, biological and physical water column properties were homogeneous down to >200 m, followed by rapid shoaling of the mixed layer to 20–30 m. Initial in situ chlorophyll a concentration was 0.4 μg L–1, and phytoplankton biomass accumulated at an average rate of 0.4 d–1 over the next 2 days. When mixed layer depth was maximal, there were no mortality losses and phytoplankton growth rates increased with increased light intensity. After shoaling, grazing rates increased, but never matched the magnitude of phytoplankton growth rates. When the mixed layer was shallowest, growth rates exceeded >1 d–1 at all non-dark light intensities. Chlorophyll a based grazing rates were consistent across light levels (∼0.3 d–1) and were highest on Synechococcus (0.3–0.6 d–1) and lowest on pico-eukaryotes (∼0.2 d–1). The delay with which grazing resumed resulted in growth exceeding losses and consumption of an average of 30% of primary production. Virus-induced mortality rates were minimal across all mixing profiles and light intensities. Overall, both chlorophyll a and group-specific phytoplankton accumulation rates predicted from the shipboard experiments matched those in situ, suggesting that incubation conditions faithfully captured the growth and loss processes governing in situ population dynamics. The observations made here indicate that transient deepening of the mixed layer followed by rapid stratification provided conditions under which phytoplankton escape protistan grazing and accumulate biomass. During the physically ... |
format |
Text |
author |
Morison, Francoise Harvey, Elizabeth Franzè, Gayantonia Menden-Deuer, Susanne |
spellingShingle |
Morison, Francoise Harvey, Elizabeth Franzè, Gayantonia Menden-Deuer, Susanne Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton |
author_facet |
Morison, Francoise Harvey, Elizabeth Franzè, Gayantonia Menden-Deuer, Susanne |
author_sort |
Morison, Francoise |
title |
Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton |
title_short |
Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton |
title_full |
Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton |
title_fullStr |
Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton |
title_full_unstemmed |
Storm-Induced Predator-Prey Decoupling Promotes Springtime Accumulation of North Atlantic Phytoplankton |
title_sort |
storm-induced predator-prey decoupling promotes springtime accumulation of north atlantic phytoplankton |
publisher |
DigitalCommons@URI |
publishDate |
2019 |
url |
https://digitalcommons.uri.edu/gsofacpubs/755 https://doi.org/10.3389/fmars.2019.00608 https://digitalcommons.uri.edu/context/gsofacpubs/article/1722/viewcontent/fmars_06_00608.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/755 doi:10.3389/fmars.2019.00608 https://digitalcommons.uri.edu/context/gsofacpubs/article/1722/viewcontent/fmars_06_00608.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fmars.2019.00608 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
_version_ |
1810463185038213120 |