Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation
Continental margins are disproportionally important for global primary production, fisheries and CO2 uptake. However, across the Northeast Atlantic shelves, there has been an ongoing summertime decline of key biota—large diatoms, dinoflagellates and copepods—that traditionally fuel higher tropic lev...
Published in: | Global Change Biology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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John Wiley & Sons Inc
2020
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Online Access: | http://plymsea.ac.uk/id/eprint/8977/ http://plymsea.ac.uk/id/eprint/8977/1/gcb.15161.pdf https://doi.org/10.1111/gcb.15161 |
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ftplymouthml:oai:plymsea.ac.uk:8977 2023-05-15T15:13:21+02:00 Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation Schmidt, K Birchill, AJ Atkinson, A Brewin, RJW Clark, JR Hickman, AE Johns, DG Lohan, MC Milne, A Pardo, S Polimene, L Smyth, TJ Tarran, GA Widdicombe, CE Woodward, EMS Ussher, SJ 2020-06-06 text http://plymsea.ac.uk/id/eprint/8977/ http://plymsea.ac.uk/id/eprint/8977/1/gcb.15161.pdf https://doi.org/10.1111/gcb.15161 en eng John Wiley & Sons Inc http://plymsea.ac.uk/id/eprint/8977/1/gcb.15161.pdf Schmidt, K; Birchill, AJ; Atkinson, A; Brewin, RJW; Clark, JR; Hickman, AE; Johns, DG; Lohan, MC; Milne, A; Pardo, S; Polimene, L; Smyth, TJ; Tarran, GA; Widdicombe, CE; Woodward, EMS; Ussher, SJ. 2020 Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation. Global Change Biology. https://doi.org/10.1111/gcb.15161 <https://doi.org/10.1111/gcb.15161> cc_by_4 CC-BY Ecology and Environment Publication - Article PeerReviewed 2020 ftplymouthml https://doi.org/10.1111/gcb.15161 2022-09-13T05:49:48Z Continental margins are disproportionally important for global primary production, fisheries and CO2 uptake. However, across the Northeast Atlantic shelves, there has been an ongoing summertime decline of key biota—large diatoms, dinoflagellates and copepods—that traditionally fuel higher tropic levels such as fish, sea birds and marine mammals. Here, we combine multiple time series with in situ process studies to link these declines to summer nutrient stress and increasing proportions of picophytoplankton that can comprise up to 90% of the combined pico‐ and nanophytoplankton biomass in coastal areas. Among the pico‐fraction, it is the cyanobacterium Synechococcus that flourishes when iron and nitrogen resupply to surface waters are diminished. Our field data show how traits beyond small size give Synechococcus a competitive edge over pico‐ and nanoeukaryotes. Key is their ability to grow at low irradiances near the nutricline, which is aided by their superior light‐harvesting system and high affinity to iron. However, minute size and lack of essential biomolecules (e.g. omega‐3 polyunsaturated fatty acids and sterols) render Synechococcus poor primary producers to sustain shelf sea food webs efficiently. The combination of earlier spring blooms and lower summer food quantity and quality creates an increasing period of suboptimal feeding conditions for zooplankton at a time of year when their metabolic demand is highest. We suggest that this nutrition‐related mismatch has contributed to the widespread, ~50% decline in summer copepod abundance we observe over the last 60 years. With Synechococcus clades being prominent from the tropics to the Arctic and their abundances increasing worldwide, our study informs projections of future food web dynamics in coastal and shelf areas where droughts and stratification lead to increasing nutrient starvation of surface waters. Article in Journal/Newspaper Arctic Northeast Atlantic Zooplankton Copepods Plymouth Marine Science Electronic Archive (PlyMSEA - Plymouth Marine Laboratory, PML) Arctic Global Change Biology 26 10 5574 5587 |
institution |
Open Polar |
collection |
Plymouth Marine Science Electronic Archive (PlyMSEA - Plymouth Marine Laboratory, PML) |
op_collection_id |
ftplymouthml |
language |
English |
topic |
Ecology and Environment |
spellingShingle |
Ecology and Environment Schmidt, K Birchill, AJ Atkinson, A Brewin, RJW Clark, JR Hickman, AE Johns, DG Lohan, MC Milne, A Pardo, S Polimene, L Smyth, TJ Tarran, GA Widdicombe, CE Woodward, EMS Ussher, SJ Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation |
topic_facet |
Ecology and Environment |
description |
Continental margins are disproportionally important for global primary production, fisheries and CO2 uptake. However, across the Northeast Atlantic shelves, there has been an ongoing summertime decline of key biota—large diatoms, dinoflagellates and copepods—that traditionally fuel higher tropic levels such as fish, sea birds and marine mammals. Here, we combine multiple time series with in situ process studies to link these declines to summer nutrient stress and increasing proportions of picophytoplankton that can comprise up to 90% of the combined pico‐ and nanophytoplankton biomass in coastal areas. Among the pico‐fraction, it is the cyanobacterium Synechococcus that flourishes when iron and nitrogen resupply to surface waters are diminished. Our field data show how traits beyond small size give Synechococcus a competitive edge over pico‐ and nanoeukaryotes. Key is their ability to grow at low irradiances near the nutricline, which is aided by their superior light‐harvesting system and high affinity to iron. However, minute size and lack of essential biomolecules (e.g. omega‐3 polyunsaturated fatty acids and sterols) render Synechococcus poor primary producers to sustain shelf sea food webs efficiently. The combination of earlier spring blooms and lower summer food quantity and quality creates an increasing period of suboptimal feeding conditions for zooplankton at a time of year when their metabolic demand is highest. We suggest that this nutrition‐related mismatch has contributed to the widespread, ~50% decline in summer copepod abundance we observe over the last 60 years. With Synechococcus clades being prominent from the tropics to the Arctic and their abundances increasing worldwide, our study informs projections of future food web dynamics in coastal and shelf areas where droughts and stratification lead to increasing nutrient starvation of surface waters. |
format |
Article in Journal/Newspaper |
author |
Schmidt, K Birchill, AJ Atkinson, A Brewin, RJW Clark, JR Hickman, AE Johns, DG Lohan, MC Milne, A Pardo, S Polimene, L Smyth, TJ Tarran, GA Widdicombe, CE Woodward, EMS Ussher, SJ |
author_facet |
Schmidt, K Birchill, AJ Atkinson, A Brewin, RJW Clark, JR Hickman, AE Johns, DG Lohan, MC Milne, A Pardo, S Polimene, L Smyth, TJ Tarran, GA Widdicombe, CE Woodward, EMS Ussher, SJ |
author_sort |
Schmidt, K |
title |
Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation |
title_short |
Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation |
title_full |
Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation |
title_fullStr |
Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation |
title_full_unstemmed |
Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation |
title_sort |
increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation |
publisher |
John Wiley & Sons Inc |
publishDate |
2020 |
url |
http://plymsea.ac.uk/id/eprint/8977/ http://plymsea.ac.uk/id/eprint/8977/1/gcb.15161.pdf https://doi.org/10.1111/gcb.15161 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Northeast Atlantic Zooplankton Copepods |
genre_facet |
Arctic Northeast Atlantic Zooplankton Copepods |
op_relation |
http://plymsea.ac.uk/id/eprint/8977/1/gcb.15161.pdf Schmidt, K; Birchill, AJ; Atkinson, A; Brewin, RJW; Clark, JR; Hickman, AE; Johns, DG; Lohan, MC; Milne, A; Pardo, S; Polimene, L; Smyth, TJ; Tarran, GA; Widdicombe, CE; Woodward, EMS; Ussher, SJ. 2020 Increasing picocyanobacteria success in shelf waters contributes to long-term food web degradation. Global Change Biology. https://doi.org/10.1111/gcb.15161 <https://doi.org/10.1111/gcb.15161> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1111/gcb.15161 |
container_title |
Global Change Biology |
container_volume |
26 |
container_issue |
10 |
container_start_page |
5574 |
op_container_end_page |
5587 |
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1766343912181465088 |