Effects of nutrient enrichment and shading on sediment primary production and metabolism in eutrophic estuaries

Stutes, Adrienne L.; Cebrián, Just; Corcoran, Alina A.

doi:10.3354/meps312029

Cited by 31 publications

(40 citation statements)

References 63 publications

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“…Light availability (represented by the attenuation coefficient) was the primary control on sediment GPP and NCP in our shallow study lagoons (Table 4), driving 24 and 31% of the variability in these rates, respectively, a pattern also reported in other shallow systems (Stutes et al 2006, Murrell et al 2009). Based on measurements by the component method, pelagic metabolism dominated the NEM signal (in a 1 m water column).…”

Section: Component Metabolismsupporting

confidence: 72%

“…The excretion of extracellular polymeric substances by MPB should reduce resuspension (MacIntyre et al 1996, Lucas et al 2001), but strong winds or tides can overcome this effect (Shaffer & Sullivan 1988, MacIntyre et al 1996. Without taxonomic distinction, we cannot be certain of the contribution of resuspended MPB to water column metabolism, but resuspended MPB can increase pelagic production and reduce sediment production through shading (MacIntyre et al 1996).Light availability (represented by the attenuation coefficient) was the primary control on sediment GPP and NCP in our shallow study lagoons (Table 4), driving 24 and 31% of the variability in these rates, respectively, a pattern also reported in other shallow systems (Stutes et al 2006, Murrell et al 2009). Based on measurements by the component method, pelagic metabolism dominated the NEM signal (in a 1 m water column).…”

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confidence: 71%

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Ecosystem metabolism in shallow coastal lagoons: patterns and partitioning of planktonic, benthic, and integrated community rates

Giordano¹,

Brush²,

Anderson³

2012

Mar. Ecol. Prog. Ser.

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Net ecosystem metabolism (NEM) provides a quantifiable and integrative method for assessing the ecological responses of aquatic ecosystems to anthropogenic disturbance and has been shown to positively relate to nutrient enrichment in some systems. We measured NEM to determine the trophic status of 4 coastal lagoons receiving a range of nutrient loads on the Virginia/ Maryland portion of the Delmarva Peninsula, USA. From July 2007 to July 2008, we used the component technique to assess NEM by developing photosynthesis−irradiance curves for both the water column and sediments approximately monthly; we added macroalgal incubations in the summer of 2008. We also measured in situ NEM by the open water method using 2 to 3 wk deployments of data sondes. Component incubations indicated net autotrophy in all 4 lagoons for March to October. No significant relationship existed between NEM and total nitrogen load overall, except for reduced autotrophy in the most enriched system. Light availability, sediment organic content, temperature and depth were all important regulators of NEM. Inclusion of macroalgal metabolism during summer 2008 had varied effects on system NEM. Open water and component methods gave divergent results. We attribute these differences to the adjacent marshes and the assumptions inherent in the 2 methods, demonstrating the need for careful attention to the method of choice for estimating system metabolism in these highly variable, shallow photic systems. Overall, NEM was net autotrophic, dominated by phytoplankton production across our study lagoons, and controlled by multiple factors.KEY WORDS: Net ecosystem metabolism · Primary production · Respiration · Coastal lagoon · Phytoplankton · Microphytobenthos · Macroalgae Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 458: 21-38, 2012 22 shellfish species (Beck et al. 2001, Able 2005, EPA 2008). The close proximity of shallow marine systems to land, their small volumes and relatively long residence times, and the penetration of light to the benthos make these systems particularly susceptible to nutrient enrichment (Duarte 1995, Bricker et al. 1999). Microphytobenthos (MPB), however, may help mediate the response of shallow systems to nutrient loading (Tobias et al. 2003, Anderson et al. 2010.Although nitrogen loads to coastal lagoons are of a magnitude similar to those of deeper estuaries, responses in shallow lagoons appear to be quite different, likely because of enhanced benthic− pelagic coupling (Nixon et al. 2001). An illuminated benthos results in a significant contribution of MPB, seagrasses and macroalgae to total system production. Under extremely high nitrogen loads, however, bloom-forming macroalgae and, ultimately, phytoplankton can dominate, shading out MPB, seagrasses and slow-growing macroalgae (Borum & Sand-Jensen, 1996, Valiela et al. 1997.Interactions between autotrophic communities are complex and predictive patterns between nutrient loading and a single component of the sys...

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Section: Component Metabolismsupporting

confidence: 72%

supporting

confidence: 71%

Ecosystem metabolism in shallow coastal lagoons: patterns and partitioning of planktonic, benthic, and integrated community rates

Giordano¹,

Brush²,

Anderson³

2012

Mar. Ecol. Prog. Ser.

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“…Weeks Bay, Alabama, in the northern Gulf of Mexico (30° 45' N, 87° 88' W), is a subestuary of Mobile Bay (Stutes et al 2006). Its surface area is 8 km².…”

Section: Methodsmentioning

confidence: 99%

Habitat Scale Mapping of Fisheries Ecosystem Service Values in Estuaries

O’Higgins¹,

Ferraro²,

Dantin³

et al. 2010

E&S

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ABSTRACT. Little is known about the variability of ecosystem service values at spatial scales most relevant to local decision makers. Competing definitions of ecosystem services, the paucity of ecological and economic information, and the lack of standardization in methodology are major obstacles to applying the ecosystem-services approach at the estuary scale. We present a standardized method that combines habitat maps and habitat-faunal associations to estimate ecosystem service values for recreational and commercial fisheries in estuaries. Three case studies in estuaries on the U.S. west coast (Yaquina Bay, Oregon), east coast (Lagoon Pond, Massachusetts), and the Gulf of Mexico (Weeks Bay, Alabama) are presented to illustrate our method's rigor and limitations using available data. The resulting spatially explicit maps of fisheries ecosystem service values show within and between estuary variations in the value of estuarine habitat types that can be used to make better informed resource-management decisions.

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“…Measurements taken 1 h after adding the nutrients revealed that immediate increases in nutrient concentration were variable (Table 3), ranging on average from 2-to 9-fold among experiments for DIN and from 2-to 5-fold for DIP. Discrepancies between targeted and realized increases in nutrient concentration often occur in fertilization experiments due to factors that are not well known and/or cannot be controlled with accuracy , Stutes et al 2006). Here, it is possible that nutrient efflux from the settling sediment into the overlying water within the aquaria may have contributed to the higher level of enrichment found in some of the experiments (Sundbäck et al 1991, Rizzo et al 1992, Hardison et al 2010.…”

Section: Methodsmentioning

confidence: 99%

Effects of grazing and fertilization on epiphyte growth dynamics under moderately eutrophic conditions: implications for grazing rate estimates

Cebrián¹,

Stutes²,

Christiaen³

2013

Mar. Ecol. Prog. Ser.

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The effects of grazing and nutrients on epiphyte biomass in seagrass beds have received much attention, yet less is known about effects on other metrics of epiphyte growth dynamics, such as epiphyte productivity and biomass turnover rates. To help address this gap, we present here a number of mesocosm experiments in which we manipulate grazer presence and nutrient concentrations under initially moderate eutrophic conditions. We also examine the potential bias contained in estimates of epiphyte grazing that disregard the effects of grazing on epiphyte productivity. The effects of grazing and nutrient enrichment on the epiphyte growth metrics examined were disparate. Namely, the effects of grazing on epiphyte biomass predominated over those of nutrient enrichment, but grazing and nutrients had similar importance as controls of epiphyte productivity and biomass turnover rates. The results illustrate that the effects of environmental and biological factors on one given metric of epiphyte growth dynamics can be quite different from those on other metrics. Thus, we suggest that the biomass-centered view mostly used to date in studies of epiphyte dynamics should perhaps shift toward a broader approach including other metrics of epiphyte growth, such as productivity and turnover rates, to better understand epiphyte dynamics in coastal systems and cascading functional consequences in the system. Another risk of biomass-centered studies lies in the calculation of grazing rates since, as also shown here, estimates of grazing rates derived as the difference in biomass accrual rates between non-grazed and grazed conditions can be highly biased.

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Effects of nutrient enrichment and shading on sediment primary production and metabolism in eutrophic estuaries

Cited by 31 publications

References 63 publications

Ecosystem metabolism in shallow coastal lagoons: patterns and partitioning of planktonic, benthic, and integrated community rates

Ecosystem metabolism in shallow coastal lagoons: patterns and partitioning of planktonic, benthic, and integrated community rates

Habitat Scale Mapping of Fisheries Ecosystem Service Values in Estuaries

Effects of grazing and fertilization on epiphyte growth dynamics under moderately eutrophic conditions: implications for grazing rate estimates

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