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Detecting subtle shifts in ecosystem functioning in a dynamic estuarine environment

(2015) PLOS ONE. 10(7).
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Abstract
Identifying the effects of stressors before they impact ecosystem functioning can be challenging in dynamic, heterogeneous 'real-world' ecosystems. In aquatic systems, for example, reductions in water clarity can limit the light available for photosynthesis, with knock-on consequences for secondary consumers, though in naturally turbid wave-swept estuaries, detecting the effects of elevated turbidity can be difficult. The objective of this study was to investigate the effects of shading on ecosystem functions mediated by sandflat primary producers (microphytobenthos) and deep-dwelling surface-feeding macrofauna (Macomona liliana; Bivalvia, Veneroida, Tellinidae). Shade cloths (which reduced incident light intensity by similar to 80%) were deployed on an exposed, intertidal sandflat to experimentally stress the microphytobenthic community associated with the sediment surface. After 13 weeks, sediment properties, macrofauna and fluxes of oxygen and inorganic nutrients across the sediment-water interface were measured. A multivariate metric of ecosystem function (MF) was generated by combining flux-based response variables, and distance-based linear models were used to determine shifts in the drivers of ecosystem function between non-shaded and shaded plots. No significant differences in MF or in the constituent ecosystem function variables were detected between the shaded and non-shaded plots. However, shading reduced the total explained variation in MF (from 64% in non-shaded plots to 15% in shaded plots) and affected the relative influence of M. liliana and other explanatory variables on MF. This suggests that although shade stress may shift the drivers of ecosystem functioning (consistent with earlier investigations of shading effects on sandflat interaction networks), ecosystem functions appear to have a degree of resilience to those changes.
Keywords
SEDIMENT-WATER INTERFACE, INTERTIDAL SANDFLATS, INTERACTION NETWORKS, MARINE ECOSYSTEMS, COASTAL, BIODIVERSITY, MACROFAUNA, BIVALVES, BIOTURBATION, COMMUNITIES

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Citation

Please use this url to cite or link to this publication:

MLA
Pratt, Daniel R et al. “Detecting Subtle Shifts in Ecosystem Functioning in a Dynamic Estuarine Environment.” PLOS ONE 10.7 (2015): n. pag. Print.
APA
Pratt, D. R., Lohrer, A. M., Thrush, S. F., Hewitt, J. E., Townsend, M., Cartner, K., Pilditch, C. A., et al. (2015). Detecting subtle shifts in ecosystem functioning in a dynamic estuarine environment. PLOS ONE, 10(7).
Chicago author-date
Pratt, Daniel R, Andrew M Lohrer, Simon F Thrush, Judi E Hewitt, Michael Townsend, Katie Cartner, Conrad A Pilditch, Rachel J Harris, Carl Van Colen, and Iván F Rodil. 2015. “Detecting Subtle Shifts in Ecosystem Functioning in a Dynamic Estuarine Environment.” Plos One 10 (7).
Chicago author-date (all authors)
Pratt, Daniel R, Andrew M Lohrer, Simon F Thrush, Judi E Hewitt, Michael Townsend, Katie Cartner, Conrad A Pilditch, Rachel J Harris, Carl Van Colen, and Iván F Rodil. 2015. “Detecting Subtle Shifts in Ecosystem Functioning in a Dynamic Estuarine Environment.” Plos One 10 (7).
Vancouver
1.
Pratt DR, Lohrer AM, Thrush SF, Hewitt JE, Townsend M, Cartner K, et al. Detecting subtle shifts in ecosystem functioning in a dynamic estuarine environment. PLOS ONE. 2015;10(7).
IEEE
[1]
D. R. Pratt et al., “Detecting subtle shifts in ecosystem functioning in a dynamic estuarine environment,” PLOS ONE, vol. 10, no. 7, 2015.
@article{6892375,
  abstract     = {Identifying the effects of stressors before they impact ecosystem functioning can be challenging in dynamic, heterogeneous 'real-world' ecosystems. In aquatic systems, for example, reductions in water clarity can limit the light available for photosynthesis, with knock-on consequences for secondary consumers, though in naturally turbid wave-swept estuaries, detecting the effects of elevated turbidity can be difficult. The objective of this study was to investigate the effects of shading on ecosystem functions mediated by sandflat primary producers (microphytobenthos) and deep-dwelling surface-feeding macrofauna (Macomona liliana; Bivalvia, Veneroida, Tellinidae). Shade cloths (which reduced incident light intensity by similar to 80%) were deployed on an exposed, intertidal sandflat to experimentally stress the microphytobenthic community associated with the sediment surface. After 13 weeks, sediment properties, macrofauna and fluxes of oxygen and inorganic nutrients across the sediment-water interface were measured. A multivariate metric of ecosystem function (MF) was generated by combining flux-based response variables, and distance-based linear models were used to determine shifts in the drivers of ecosystem function between non-shaded and shaded plots. No significant differences in MF or in the constituent ecosystem function variables were detected between the shaded and non-shaded plots. However, shading reduced the total explained variation in MF (from 64% in non-shaded plots to 15% in shaded plots) and affected the relative influence of M. liliana and other explanatory variables on MF. This suggests that although shade stress may shift the drivers of ecosystem functioning (consistent with earlier investigations of shading effects on sandflat interaction networks), ecosystem functions appear to have a degree of resilience to those changes.},
  articleno    = {e0133914},
  author       = {Pratt, Daniel R and Lohrer, Andrew M and Thrush, Simon F and Hewitt, Judi E and Townsend, Michael and Cartner, Katie and Pilditch, Conrad A and Harris, Rachel J and Van Colen, Carl and Rodil, Iván F},
  issn         = {1932-6203},
  journal      = {PLOS ONE},
  keywords     = {SEDIMENT-WATER INTERFACE,INTERTIDAL SANDFLATS,INTERACTION NETWORKS,MARINE ECOSYSTEMS,COASTAL,BIODIVERSITY,MACROFAUNA,BIVALVES,BIOTURBATION,COMMUNITIES},
  language     = {eng},
  number       = {7},
  pages        = {16},
  title        = {Detecting subtle shifts in ecosystem functioning in a dynamic estuarine environment},
  url          = {http://dx.doi.org/10.1371/journal.pone.0133914},
  volume       = {10},
  year         = {2015},
}

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