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Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production

Predictions of how salt marsh primary production and carbon storage will respond to environmental change can be improved through detailed datasets documenting responses to real‐world environmental variation. To address a shortage of detailed studies of natural variation, we examined drivers of Spart...

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Autores principales: Hill, Troy D., Roberts, Brian J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5696422/
https://www.ncbi.nlm.nih.gov/pubmed/29187999
http://dx.doi.org/10.1002/ece3.3494
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author Hill, Troy D.
Roberts, Brian J.
author_facet Hill, Troy D.
Roberts, Brian J.
author_sort Hill, Troy D.
collection PubMed
description Predictions of how salt marsh primary production and carbon storage will respond to environmental change can be improved through detailed datasets documenting responses to real‐world environmental variation. To address a shortage of detailed studies of natural variation, we examined drivers of Spartina alterniflora stem allometry and productivity in seven marshes across three regions in southern Louisiana. Live‐stem allometry varied spatially and seasonally, generally with short stems weighing more (and tall stems weighing less) in the summer and fall, differences that persist even after correcting for flowering. Strong predictive relationships exist between allometry parameters representing emergent stem mass and mass accumulation rates, suggesting that S. alterniflora populations navigate a trade‐off between larger mass at emergence and faster rates of biomass accumulation. Aboveground production and belowground production were calculated using five and four approaches, respectively. End‐of‐season aboveground biomass was a poor proxy for increment‐based production measures. Aboveground production (Smalley) ranged from 390 to 3,350 g m(−2 )year(−1) across all marshes and years. Belowground production (max–min) was on average three times higher than aboveground; total production ranged from 1,400 to 8,500 g m(−2 )year(−1). Above‐ and belowground production were both positively correlated with dissolved nutrient concentrations and negatively correlated to salinity. Synthesis: Interannual variation in water quality is sufficient to drive above‐ and belowground productivity. The positive relationship between nutrients and belowground production indicates that inputs of nutrients and freshwater may increase salt marsh carbon storage and ecosystem resilience to sea level rise.
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spelling pubmed-56964222017-11-29 Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production Hill, Troy D. Roberts, Brian J. Ecol Evol Original Research Predictions of how salt marsh primary production and carbon storage will respond to environmental change can be improved through detailed datasets documenting responses to real‐world environmental variation. To address a shortage of detailed studies of natural variation, we examined drivers of Spartina alterniflora stem allometry and productivity in seven marshes across three regions in southern Louisiana. Live‐stem allometry varied spatially and seasonally, generally with short stems weighing more (and tall stems weighing less) in the summer and fall, differences that persist even after correcting for flowering. Strong predictive relationships exist between allometry parameters representing emergent stem mass and mass accumulation rates, suggesting that S. alterniflora populations navigate a trade‐off between larger mass at emergence and faster rates of biomass accumulation. Aboveground production and belowground production were calculated using five and four approaches, respectively. End‐of‐season aboveground biomass was a poor proxy for increment‐based production measures. Aboveground production (Smalley) ranged from 390 to 3,350 g m(−2 )year(−1) across all marshes and years. Belowground production (max–min) was on average three times higher than aboveground; total production ranged from 1,400 to 8,500 g m(−2 )year(−1). Above‐ and belowground production were both positively correlated with dissolved nutrient concentrations and negatively correlated to salinity. Synthesis: Interannual variation in water quality is sufficient to drive above‐ and belowground productivity. The positive relationship between nutrients and belowground production indicates that inputs of nutrients and freshwater may increase salt marsh carbon storage and ecosystem resilience to sea level rise. John Wiley and Sons Inc. 2017-10-16 /pmc/articles/PMC5696422/ /pubmed/29187999 http://dx.doi.org/10.1002/ece3.3494 Text en © 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Hill, Troy D.
Roberts, Brian J.
Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production
title Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production
title_full Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production
title_fullStr Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production
title_full_unstemmed Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production
title_short Effects of seasonality and environmental gradients on Spartina alterniflora allometry and primary production
title_sort effects of seasonality and environmental gradients on spartina alterniflora allometry and primary production
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5696422/
https://www.ncbi.nlm.nih.gov/pubmed/29187999
http://dx.doi.org/10.1002/ece3.3494
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