Impact of nutrient enrichment on productivity of coastal water along the SE Mediterranean shore of Israel - A bioassay approach

Eyal Rahav; Ofrat Raveh; Or Hazan; Nurit Gordon; Nurit Kress; Jacob Silverman; Barak Herut

doi:10.1016/j.marpolbul.2017.12.048

Impact of nutrient enrichment on productivity of coastal water along the SE Mediterranean shore of Israel - A bioassay approach

Eyal Rahav, Ofrat Raveh, Or Hazan, Nurit Gordon, Nurit Kress, Jacob Silverman, Barak Herut

Israel Oceanographic & Limnological Research Ltd.

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The coastal waters of the southeastern Mediterranean-Sea (SEMS) are routinely enriched with naturally-occurring and anthropogenic land-based nutrient loads. These external inputs may affect autotrophic and heterotrophic microbial biomass and activity. Here, we conducted 13 microcosm bioassays with different additions of inorganic NO₃-(N), PO₄-(P) and Si(OH)₄-(Si) in different seasons along the Mediterranean coast of Israel. Our results indicate that cyanobacteria are mainly N-limited, whereas N or Si (or both) limit pico-eukaryotes. Furthermore, the degree to which N affects phytoplankton depends on the ambient seawater's inorganic N and N:P characteristics. Heterotrophic bacteria displayed no response in all treatments, except when all nutrients were added simultaneously, suggesting a possible co-limitation by nutrients. These results contrast the N + P co-limitation of phytoplankton and the P-limitation of bacteria in the open waters of the SEMS. These observations enable the application for a better science-based environmental monitoring and policy implementation along the SEMS coast of Israel.

Original language	English
Pages (from-to)	559-567
Number of pages	9
Journal	Marine Pollution Bulletin
Volume	127
DOIs	https://doi.org/10.1016/j.marpolbul.2017.12.048
State	Published - Feb 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd

Funding

We thank the research assistants of the Marine Chemistry Department at IOLR for the nutrient analyses and the crew of the R/V Etziona for their work at sea. We also thank Lilach Baumer for English editing. This work was supported by grants awarded by the Ministry of National Infrastructures, Energy and Water Resources (grant number 3-11519) to E.R, by the Ministry of Environmental Protection (grant number 145–1–2) to N·K, B·H, J.S and E.R, by the Israeli National Monitoring Program to B·H and E.R and by the PERSEUS project (EC Contract 287600) to B.H. This work is in partial fulfillment of the M.Sc. thesis of Ofrat Raveh (Haifa University). We thank the research assistants of the Marine Chemistry Department at IOLR for the nutrient analyses and the crew of the R/V Etziona for their work at sea. We also thank Lilach Baumer for English editing. This work was supported by grants awarded by the Ministry of National Infrastructures, Energy and Water Resources (grant number 3-11519) to E.R, by the Ministry of Environmental Protection (grant number 145–1–2 ) to N·K, B·H, J.S and E.R, by the Israeli National Monitoring Program to B·H and E.R and by the PERSEUS project (EC Contract 287600 ) to B.H. This work is in partial fulfillment of the M.Sc. thesis of Ofrat Raveh (Haifa University).

Funders	Funder number
Ministry of Environmental Protection	145–1–2
European Commission	287600
Ministry of Environmental Protection
Ministry of National Infrastructure, Energy and Water Resources	3-11519

Keywords

Bacterial-production
Chlorophyll-a
Nutrients
Primary-production
SE Mediterranean-Sea

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10.1016/j.marpolbul.2017.12.048

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abstract = "The coastal waters of the southeastern Mediterranean-Sea (SEMS) are routinely enriched with naturally-occurring and anthropogenic land-based nutrient loads. These external inputs may affect autotrophic and heterotrophic microbial biomass and activity. Here, we conducted 13 microcosm bioassays with different additions of inorganic NO3-(N), PO4-(P) and Si(OH)4-(Si) in different seasons along the Mediterranean coast of Israel. Our results indicate that cyanobacteria are mainly N-limited, whereas N or Si (or both) limit pico-eukaryotes. Furthermore, the degree to which N affects phytoplankton depends on the ambient seawater's inorganic N and N:P characteristics. Heterotrophic bacteria displayed no response in all treatments, except when all nutrients were added simultaneously, suggesting a possible co-limitation by nutrients. These results contrast the N + P co-limitation of phytoplankton and the P-limitation of bacteria in the open waters of the SEMS. These observations enable the application for a better science-based environmental monitoring and policy implementation along the SEMS coast of Israel.",

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doi = "10.1016/j.marpolbul.2017.12.048",

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AU - Silverman, Jacob

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AB - The coastal waters of the southeastern Mediterranean-Sea (SEMS) are routinely enriched with naturally-occurring and anthropogenic land-based nutrient loads. These external inputs may affect autotrophic and heterotrophic microbial biomass and activity. Here, we conducted 13 microcosm bioassays with different additions of inorganic NO3-(N), PO4-(P) and Si(OH)4-(Si) in different seasons along the Mediterranean coast of Israel. Our results indicate that cyanobacteria are mainly N-limited, whereas N or Si (or both) limit pico-eukaryotes. Furthermore, the degree to which N affects phytoplankton depends on the ambient seawater's inorganic N and N:P characteristics. Heterotrophic bacteria displayed no response in all treatments, except when all nutrients were added simultaneously, suggesting a possible co-limitation by nutrients. These results contrast the N + P co-limitation of phytoplankton and the P-limitation of bacteria in the open waters of the SEMS. These observations enable the application for a better science-based environmental monitoring and policy implementation along the SEMS coast of Israel.

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Impact of nutrient enrichment on productivity of coastal water along the SE Mediterranean shore of Israel - A bioassay approach

Abstract

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Keywords

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