Microbial food web structural and functional responses to oyster and fish as top predators
The impact of fish and oysters on components of the pelagic microbial food web (MFW) was studied in a 10 d mesocosm experiment using Mediterranean coastal waters. Two mesocosms contained natural water only ('Controls'), 2 contained natural water with Crassostrea gigas ('Oyster'),...
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ftarchimer:oai:archimer.ifremer.fr:39489 2023-05-15T15:58:58+02:00 Microbial food web structural and functional responses to oyster and fish as top predators Mostajir, Behzad Roques, Cecile Bouvier, Corinne Bouvier, Thierry Fouilland, Eric Got, Patrice Le Floc'H, Emilie Nouguier, Jean Mas, Sebastien Sempere, Richard Sime-ngando, Telesphore Troussellier, Marc Vidussi, Francesca 2015-09 application/pdf https://archimer.ifremer.fr/doc/00284/39489/73675.pdf https://doi.org/10.3354/meps11429 https://archimer.ifremer.fr/doc/00284/39489/ eng eng Inter-research https://archimer.ifremer.fr/doc/00284/39489/73675.pdf doi:10.3354/meps11429 https://archimer.ifremer.fr/doc/00284/39489/ info:eu-repo/semantics/openAccess restricted use Marine Ecology Progress Series (0171-8630) (Inter-research), 2015-09 , Vol. 535 , P. 11-27 Microbial food web Virioplankton Bacterioplankton Phytoplankton Protozooplankton Crassostrea Atherina Autotrophy Heterotrophy text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.3354/meps11429 2021-09-23T20:26:41Z The impact of fish and oysters on components of the pelagic microbial food web (MFW) was studied in a 10 d mesocosm experiment using Mediterranean coastal waters. Two mesocosms contained natural water only ('Controls'), 2 contained natural water with Crassostrea gigas ('Oyster'), and 2 contained natural water with Atherina spp. ('Fish'). Abundances and biomasses of microorganisms (viruses, bacteria, phytoplankton, heterotrophic flagellates, and ciliates) were measured to estimate their contribution to the total microbial carbon biomass. Two MFW indices, the microbial autotroph: heterotroph C biomass ratio (A:H) structural index and the gross primary production: respiration ratio (GPP:R) functional index, were defined. In the Fish mesocosms, selective predation on zooplankton led to a trophic cascade with 51% higher phytoplankton C biomass and consequently higher A: H and GPP: R than in the Controls. By the end of the experiment, the Oyster mesocosms had a bacterial C biomass 87% higher and phytoplankton C biomass 93% lower than the Controls, giving significantly lower A: H and GPP: R (<1). Overall, the results showed that wild zooplanktivorous fish had a cascading trophic effect, making the MFW more autotrophic (both indices >1), whereas oyster activities made the MFW more heterotrophic (both indices <1). These MFW indices can therefore be used to assess the impact of multiple local and global forcing factors on the MFW. The results presented here also have implications for sustainable management of coastal environments, suggesting that intense cultivation of filter feeders can be coupled with management to encourage wild local zooplanktivorous fishes to maintain a more resilient system and preserve the equilibrium of the MFW. Article in Journal/Newspaper Crassostrea gigas Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Marine Ecology Progress Series 535 11 27 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Microbial food web Virioplankton Bacterioplankton Phytoplankton Protozooplankton Crassostrea Atherina Autotrophy Heterotrophy |
spellingShingle |
Microbial food web Virioplankton Bacterioplankton Phytoplankton Protozooplankton Crassostrea Atherina Autotrophy Heterotrophy Mostajir, Behzad Roques, Cecile Bouvier, Corinne Bouvier, Thierry Fouilland, Eric Got, Patrice Le Floc'H, Emilie Nouguier, Jean Mas, Sebastien Sempere, Richard Sime-ngando, Telesphore Troussellier, Marc Vidussi, Francesca Microbial food web structural and functional responses to oyster and fish as top predators |
topic_facet |
Microbial food web Virioplankton Bacterioplankton Phytoplankton Protozooplankton Crassostrea Atherina Autotrophy Heterotrophy |
description |
The impact of fish and oysters on components of the pelagic microbial food web (MFW) was studied in a 10 d mesocosm experiment using Mediterranean coastal waters. Two mesocosms contained natural water only ('Controls'), 2 contained natural water with Crassostrea gigas ('Oyster'), and 2 contained natural water with Atherina spp. ('Fish'). Abundances and biomasses of microorganisms (viruses, bacteria, phytoplankton, heterotrophic flagellates, and ciliates) were measured to estimate their contribution to the total microbial carbon biomass. Two MFW indices, the microbial autotroph: heterotroph C biomass ratio (A:H) structural index and the gross primary production: respiration ratio (GPP:R) functional index, were defined. In the Fish mesocosms, selective predation on zooplankton led to a trophic cascade with 51% higher phytoplankton C biomass and consequently higher A: H and GPP: R than in the Controls. By the end of the experiment, the Oyster mesocosms had a bacterial C biomass 87% higher and phytoplankton C biomass 93% lower than the Controls, giving significantly lower A: H and GPP: R (<1). Overall, the results showed that wild zooplanktivorous fish had a cascading trophic effect, making the MFW more autotrophic (both indices >1), whereas oyster activities made the MFW more heterotrophic (both indices <1). These MFW indices can therefore be used to assess the impact of multiple local and global forcing factors on the MFW. The results presented here also have implications for sustainable management of coastal environments, suggesting that intense cultivation of filter feeders can be coupled with management to encourage wild local zooplanktivorous fishes to maintain a more resilient system and preserve the equilibrium of the MFW. |
format |
Article in Journal/Newspaper |
author |
Mostajir, Behzad Roques, Cecile Bouvier, Corinne Bouvier, Thierry Fouilland, Eric Got, Patrice Le Floc'H, Emilie Nouguier, Jean Mas, Sebastien Sempere, Richard Sime-ngando, Telesphore Troussellier, Marc Vidussi, Francesca |
author_facet |
Mostajir, Behzad Roques, Cecile Bouvier, Corinne Bouvier, Thierry Fouilland, Eric Got, Patrice Le Floc'H, Emilie Nouguier, Jean Mas, Sebastien Sempere, Richard Sime-ngando, Telesphore Troussellier, Marc Vidussi, Francesca |
author_sort |
Mostajir, Behzad |
title |
Microbial food web structural and functional responses to oyster and fish as top predators |
title_short |
Microbial food web structural and functional responses to oyster and fish as top predators |
title_full |
Microbial food web structural and functional responses to oyster and fish as top predators |
title_fullStr |
Microbial food web structural and functional responses to oyster and fish as top predators |
title_full_unstemmed |
Microbial food web structural and functional responses to oyster and fish as top predators |
title_sort |
microbial food web structural and functional responses to oyster and fish as top predators |
publisher |
Inter-research |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00284/39489/73675.pdf https://doi.org/10.3354/meps11429 https://archimer.ifremer.fr/doc/00284/39489/ |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
Marine Ecology Progress Series (0171-8630) (Inter-research), 2015-09 , Vol. 535 , P. 11-27 |
op_relation |
https://archimer.ifremer.fr/doc/00284/39489/73675.pdf doi:10.3354/meps11429 https://archimer.ifremer.fr/doc/00284/39489/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3354/meps11429 |
container_title |
Marine Ecology Progress Series |
container_volume |
535 |
container_start_page |
11 |
op_container_end_page |
27 |
_version_ |
1766394743010361344 |