High ammonium availability amplifies the adverse effect of low salinity on eelgrass Zostera marina

Beatriz Villazán, Tiina Elina Salo, Fernando G. Brun, Juan J. Vergara, Morten Foldager Pedersen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Climate change intensifies the frequency and intensity of rainfall events, which increases the discharge of freshwater and nutrients to coastal areas. This may lower salinity and increase nutrient availability and, thus, affect estuarine eelgrass populations. We studied the interactive effect of increasing NH4+ levels and low salinity on estuarine eelgrass Zostera marina, grown in microcosm at various combinations of NH4+ enrichment (0, 10 and 25 µM) and salinity (5, 12.5 and 20). Increasing NH4+ had a positive effect on eelgrass performance as long as salinity was kept at ambient level (20). N enrichment was followed by an increase in pigments, photosynthesis and various growth variables and a decrease in stored carbon concentrations (sucrose and starch). Low salinity had an overall negative effect on plant fitness; pigment concentration, photosynthesis and growth were reduced while mortality increased. Exposure to low salinity was also followed by a decrease in sucrose, suggesting that it was used as an osmolyte and/or that photosynthesis could not cover energy requirements needed for osmoregulation or repairing processes. Concomitant exposure to high NH4+ and low salinity turned the positive effect of NH4+ into a strong, negative synergistic effect. Several growth-related variables were affected significantly and mortality increased substantially. We suggest that this simultaneous exposure intensified competition for energy and C skeletons affecting other metabolic processes (e.g. growth, repair processes) negatively. Our results suggest that climate change driven alterations in precipitation and NH4+ loading might seriously impact estuarine eelgrass communities
OriginalsprogEngelsk
TidsskriftMarine Ecology - Progress Series
Vol/bind536
Sider (fra-til)146-162
ISSN0171-8630
DOI
StatusUdgivet - 29 sep. 2015

Citer dette

Villazán, Beatriz ; Salo, Tiina Elina ; Brun, Fernando G. ; Vergara, Juan J. ; Pedersen, Morten Foldager. / High ammonium availability amplifies the adverse effect of low salinity on eelgrass Zostera marina. I: Marine Ecology - Progress Series. 2015 ; Bind 536. s. 146-162.
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abstract = "Climate change intensifies the frequency and intensity of rainfall events, which increases the discharge of freshwater and nutrients to coastal areas. This may lower salinity and increase nutrient availability and, thus, affect estuarine eelgrass populations. We studied the interactive effect of increasing NH4+ levels and low salinity on estuarine eelgrass Zostera marina, grown in microcosm at various combinations of NH4+ enrichment (0, 10 and 25 µM) and salinity (5, 12.5 and 20). Increasing NH4+ had a positive effect on eelgrass performance as long as salinity was kept at ambient level (20). N enrichment was followed by an increase in pigments, photosynthesis and various growth variables and a decrease in stored carbon concentrations (sucrose and starch). Low salinity had an overall negative effect on plant fitness; pigment concentration, photosynthesis and growth were reduced while mortality increased. Exposure to low salinity was also followed by a decrease in sucrose, suggesting that it was used as an osmolyte and/or that photosynthesis could not cover energy requirements needed for osmoregulation or repairing processes. Concomitant exposure to high NH4+ and low salinity turned the positive effect of NH4+ into a strong, negative synergistic effect. Several growth-related variables were affected significantly and mortality increased substantially. We suggest that this simultaneous exposure intensified competition for energy and C skeletons affecting other metabolic processes (e.g. growth, repair processes) negatively. Our results suggest that climate change driven alterations in precipitation and NH4+ loading might seriously impact estuarine eelgrass communities",
author = "Beatriz Villaz{\'a}n and Salo, {Tiina Elina} and Brun, {Fernando G.} and Vergara, {Juan J.} and Pedersen, {Morten Foldager}",
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High ammonium availability amplifies the adverse effect of low salinity on eelgrass Zostera marina. / Villazán, Beatriz; Salo, Tiina Elina; Brun, Fernando G.; Vergara, Juan J.; Pedersen, Morten Foldager.

I: Marine Ecology - Progress Series, Bind 536, 29.09.2015, s. 146-162.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - High ammonium availability amplifies the adverse effect of low salinity on eelgrass Zostera marina

AU - Villazán, Beatriz

AU - Salo, Tiina Elina

AU - Brun, Fernando G.

AU - Vergara, Juan J.

AU - Pedersen, Morten Foldager

PY - 2015/9/29

Y1 - 2015/9/29

N2 - Climate change intensifies the frequency and intensity of rainfall events, which increases the discharge of freshwater and nutrients to coastal areas. This may lower salinity and increase nutrient availability and, thus, affect estuarine eelgrass populations. We studied the interactive effect of increasing NH4+ levels and low salinity on estuarine eelgrass Zostera marina, grown in microcosm at various combinations of NH4+ enrichment (0, 10 and 25 µM) and salinity (5, 12.5 and 20). Increasing NH4+ had a positive effect on eelgrass performance as long as salinity was kept at ambient level (20). N enrichment was followed by an increase in pigments, photosynthesis and various growth variables and a decrease in stored carbon concentrations (sucrose and starch). Low salinity had an overall negative effect on plant fitness; pigment concentration, photosynthesis and growth were reduced while mortality increased. Exposure to low salinity was also followed by a decrease in sucrose, suggesting that it was used as an osmolyte and/or that photosynthesis could not cover energy requirements needed for osmoregulation or repairing processes. Concomitant exposure to high NH4+ and low salinity turned the positive effect of NH4+ into a strong, negative synergistic effect. Several growth-related variables were affected significantly and mortality increased substantially. We suggest that this simultaneous exposure intensified competition for energy and C skeletons affecting other metabolic processes (e.g. growth, repair processes) negatively. Our results suggest that climate change driven alterations in precipitation and NH4+ loading might seriously impact estuarine eelgrass communities

AB - Climate change intensifies the frequency and intensity of rainfall events, which increases the discharge of freshwater and nutrients to coastal areas. This may lower salinity and increase nutrient availability and, thus, affect estuarine eelgrass populations. We studied the interactive effect of increasing NH4+ levels and low salinity on estuarine eelgrass Zostera marina, grown in microcosm at various combinations of NH4+ enrichment (0, 10 and 25 µM) and salinity (5, 12.5 and 20). Increasing NH4+ had a positive effect on eelgrass performance as long as salinity was kept at ambient level (20). N enrichment was followed by an increase in pigments, photosynthesis and various growth variables and a decrease in stored carbon concentrations (sucrose and starch). Low salinity had an overall negative effect on plant fitness; pigment concentration, photosynthesis and growth were reduced while mortality increased. Exposure to low salinity was also followed by a decrease in sucrose, suggesting that it was used as an osmolyte and/or that photosynthesis could not cover energy requirements needed for osmoregulation or repairing processes. Concomitant exposure to high NH4+ and low salinity turned the positive effect of NH4+ into a strong, negative synergistic effect. Several growth-related variables were affected significantly and mortality increased substantially. We suggest that this simultaneous exposure intensified competition for energy and C skeletons affecting other metabolic processes (e.g. growth, repair processes) negatively. Our results suggest that climate change driven alterations in precipitation and NH4+ loading might seriously impact estuarine eelgrass communities

U2 - 10.3354/meps11435

DO - 10.3354/meps11435

M3 - Journal article

VL - 536

SP - 146

EP - 162

JO - Marine Ecology - Progress Series

JF - Marine Ecology - Progress Series

SN - 0171-8630

ER -