Effect of geomorphological setting and rainfall on nutrient exchange in mangroves during tidal inundation

2010 ◽  
Vol 61 (10) ◽  
pp. 1197 ◽  
Author(s):  
María Fernanda Adame ◽  
Bernardino Virdis ◽  
Catherine E. Lovelock
Keyword(s):  
Soluble Reactive Phosphorus ◽  
Nutrient Retention ◽  
Nutrient Concentrations ◽  
Tidal Inundation ◽  
Nutrient Exchange ◽  
Tidal Cycles ◽  
Negative Impacts ◽  
Reactive Phosphorus ◽  
Riverine Mangroves

One of the key ecosystem services provided by mangroves is their role in mediating nutrient exchange, thereby protecting coastal ecosystems from negative impacts of nutrient enrichment. In this study, we tested whether geomorphological setting and level of rainfall affect the intensity and direction of nutrient exchange. Our hypotheses were that tidal mangroves retain more nutrients than riverine mangroves and that nutrient retention is stronger during periods of high rainfall. Concentrations of soluble reactive phosphorus (SRP), nitrogen oxides (NOx–-N) and ammonium (NH4+) were measured from water entering and leaving the mangroves during tidal cycles. Our results show that nutrient concentrations were higher in the flood tide compared with the ebb tide by up to 28% for NOx–-N, 51% for SRP and 83% for NH4+, suggesting retention by the mangroves. Geomorphological setting determined nutrient exchange to some extent, with some riverine sites receiving more nutrients than tidal sites and thus, being more important in nutrient retention. Rainfall was important in determining nutrient exchange as it enhanced SRP and NH4+ retention. These results show that mangroves can improve water quality of creeks and rivers, and underscore the need for conservation of mangroves over a range of geomorphological settings.

Nutrient exchange of extensive cyanobacterial mats in an arid subtropical wetland

2012 ◽  
Vol 63 (5) ◽  
pp. 457 ◽  
Author(s):  
Maria Fernanda Adame ◽  
Ruth Reef ◽  
Alistair Grinham ◽  
Glen Holmes ◽  
Catherine E. Lovelock
Keyword(s):  
Intertidal Zone ◽  
Soluble Reactive Phosphorus ◽  
N Fixation ◽  
Tidal Inundation ◽  
Cyanobacterial Mats ◽  
Cyanobacterial Mat ◽  
Nutrient Exchange ◽  
Reactive Phosphorus ◽  
Exmouth Gulf ◽  
N Incorporation

Cyanobacterial mats cover extensive areas of subtropical arid coastal wetlands and are sites of active nutrient exchange. To assess spatial (low v. high in the intertidal zone) and temporal (day v. night) variability in nitrogen (N) exchange in arid Exmouth Gulf, Western Australia, we measured nutrient exchange (NOx–-N, NH4+ and soluble reactive phosphorus) during tidal inundation and N fixation of cyanobacterial mats before and during an unusual period of heavy rainfall. Additionally, we investigated the species composition within the cyanobacterial mat. We hypothesised that nutrients are released to the floodwater during tidal inundation, that N fixation is a significant path of N incorporation, that highest N fixation rates occur in the low intertidal zone at night, and that the cyanobacterial mat community composition varies across the intertidal zone. Our results showed that nutrients were removed from the floodwater during tidal inundation. N fixation accounted for 34% of N incorporation, with highest rates in the lower intertidal zone during the day. The cyanobacterial mat was dominated by Microcoleus chthonoplastes, but composition varied across the intertidal zone. The present study provided evidence of temporal and spatial variability in nutrient exchange and implied an important role of cyanobacterial mats in coastal production.

scholarly journals Impacts of drying and reflooding on water quality of a tropical semi-arid reservoir during an extended drought event

2019 ◽  
Vol 31 ◽  
Author(s):  
Jéssica Nayara de Carvalho Leite ◽  
Vanessa Becker
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Chlorophyll A ◽  
Total Phosphorus ◽  
Algal Biomass ◽  
Soluble Reactive Phosphorus ◽  
Drought Event ◽  
Reactive Phosphorus ◽  
Semi Arid

Abstract Aim The aim of this study was to analyze the water quality of a tropical, semi-arid reservoir after a reflooding. In terms of impact on water quality after a drought event, it is expected that there will be improvements with the reflooding. Less algal biomass, increased water transparency, decreased turbidity and low nutrient concentration. Methods This study was performed in a tropical, semi-arid man-made lake (Dourado Reservoir), during an extended drought period. This study consisted of a comparison of three distinct periods determined by water accumulation. The limnological variables, including water transparency, turbidity, electrical conductivity, pH, total phosphorus, soluble reactive phosphorus, and chlorophyll-a were analyzed. A principal component analysis (PCA) was also performed to verify the patterns of the variables in relation to the sample units in the studied periods. Results After water renewal, there was an expressive reduction in chlorophyll-a. Electrical conductivity, pH, and turbidity variables also reduced after the reflooding, indicating an improvement in water quality. There was no reduction in total phosphorus and soluble reactive phosphorus after the reflooding compared to the previous periods. Conclusions The significant reduction in algal biomass after reflooding in Dourado indicates water quality improvement in terms of eutrophication due to the change of the trophic state from eutrophic to mesotrophic.

scholarly journals Primary production and phosphorus modelling in LakeVegoritis, Greece

2014 ◽  
Vol 5 (1) ◽  
pp. 18
Author(s):  
Soultana K. Gianniou ◽  
Vassilis Z. Antonopoulos
Keyword(s):  
Water Quality ◽  
Primary Production ◽  
Model Simulation ◽  
Soluble Reactive Phosphorus ◽  
Quality Model ◽  
Lake Water Quality ◽  
Phytoplankton Primary Production ◽  
Reactive Phosphorus ◽  
Phosphorus Modelling

Primary production and phosphorus are two of the most important determinants of the water quality of lakes. Phytoplankton primary production and phosphorus cycling were modelled within a one-dimensional lake water quality model. The model was calibrated and applied to Lake Vegoritis in Greece for two different years (1981 and 1993) using daily meteorological variables and inflow rates as input data. Monthly profiles of temperature, chlorophyll-a, and oxygen concentration for these two years were used to calibrate the model. Simulation results indicate that the thermal regime of the lake strongly affects phosphorus profiles and that phytoplankton concentrations throughout the year are tightly correlated with soluble reactive phosphorus concentrations. The significant decrease in the depth and the volume of the lake from 1981 to 1993 resulted in important changes in phytoplankton and phosphorus concentrations. A sensitivity analysis was conducted to estimate the errors resulting from the uncertainty in the biochemical variables of the model and the limited data on phosphorus and phytoplankton.

scholarly journals Nutrients retention in a small subtropical wetland (México)

2016 ◽  
Vol 75 (s1) ◽  
Author(s):  
Martha B. Rendón-López ◽  
M. Luisa Suarez Alonso ◽  
Gloria L. Ayala-Ramirez ◽  
Yazmin Hernández-Linares ◽  
Alberto Gómez-Tagle Chavez ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Hydrological Cycle ◽  
Soluble Reactive Phosphorus ◽  
Nutrient Retention ◽  
Dry Period ◽  
Rainy Period ◽  
Subtropical Wetland ◽  
Macrophyte Community ◽  
Tropical Areas ◽  
Reactive Phosphorus

<p>In tropical areas very few studies have analysed wetlands’ ability to control nutrients. We analysed the efficiency of the Pátzcuaro subtropical wetland in Mexico to retain nutrients (total phosphorus: TP; soluble reactive phosphorus: PO<sub>4</sub><sup>3-</sup>, nitrite: NO<sub>2</sub><sup>-</sup> and nitrate: NO<sub>3</sub><sup>-</sup>) and total suspended solids (TSS) and its temporal variability from November 2011 to October 2012, where two hydrological different periods (dry and wet periods) were included. The results indicate that, annually, this wetland reduced TP, 30.4%; PO<sub>4</sub><sup>3-</sup>, 19.2%; NO<sub>2</sub><sup>-</sup>, 2.5%; NO<sub>3</sub><sup>-</sup>, 17.6%; and TSS, 14.7%. However, the reduction % rose to 55.3% for TP and to 47.3% for PO<sub>4</sub><sup>3-</sup> during the dry period and to 14.1 % for NO<sub>2</sub><sup>-</sup>, 49% for NO<sub>3</sub><sup>-</sup> and 44.5% for TSS during the rainy period. These results show dependence on the hydrological cycle, although P retention is also related with uptake by a dense macrophyte community and with organic matter accumulation. The results obtained suggest that removal of N is due mainly to denitrification. TSS retention seems to respond to low speed hydraulics and the resistance generated by macrophytes roots and floating plants. Like other studies in temperate environments, this wetland seems to remove more efficiently P than N. Unlike that  in temperate environments where the highest nutrient retention occurs in autumn, we found the highest retention values for both NO<sub>2</sub><sup>-</sup> and NO<sub>3</sub><sup>-</sup> during summer (rainy period), and the lowest for P, probably due to release of P for the senescence of wetland plants during this period.   </p>

scholarly journals Dissolved Organic Matter Quality and Biofilm Composition Affect Microbial Organic Matter Uptake in Stream Flumes

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3246
Author(s):  
Gabriele Weigelhofer ◽  
Tania Sosa Jirón ◽  
Tz-Ching Yeh ◽  
Gertraud Steniczka ◽  
Matthias Pucher
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Algal Growth ◽  
Soluble Reactive Phosphorus ◽  
Single Pulse ◽  
Interactive Effects ◽  
Nutrient Concentrations ◽  
Cow Dung ◽  
Organic Matter Quality ◽  
Reactive Phosphorus

Agriculture delivers significant amounts of dissolved organic matter (DOM) to streams, thereby changing the composition and biodegradability of the aquatic DOM. This study focuses on the interactive effects of DOM quality and biofilm composition on the degradation of DOM in a laboratory flume experiment. Half of the flumes were exposed to light to stimulate algal growth, the other half was shaded. Leachates of deciduous leaves, maize leaves, and cow dung were added to the flumes in a single pulse and changes of DOC (dissolved organic carbon) and nutrient concentrations, DOM composition (absorbance and fluorescence data), chlorophyll-a concentrations, bacterial abundances, and enzymatic activities were recorded over a week. DOM was taken up with rates of 50, 109, and 136 µg DOC L−1 h−1 for dung, leaf, and maize leachates, respectively, in the light flumes and 37, 80, and 170 µg DOC L−1 h−1 in the dark flumes. DOC uptake correlated strongly with initial SRP (soluble reactive phosphorus) and DOC concentrations, but barely with DOM components and indices. Algae mostly stimulated the microbial DOC uptake, but the effects differed among differently aged biofilms. We developed a conceptual model of intrinsic (DOM quality) and external (environmental) controlling factors on DOM degradation, with the microbial community acting as biotic filter.

scholarly journals Nutrient concentrations and fluxes for podzolic and gley soils at Plynlimon, mid-Wales: implications for modelling inorganic nitrogen and phosphorus in upland UK environments

2002 ◽  
Vol 6 (3) ◽  
pp. 403-420
Author(s):  
C. Neal
Keyword(s):  
Inorganic Nitrogen ◽  
Soluble Reactive Phosphorus ◽  
Sitka Spruce ◽  
Nutrient Concentrations ◽  
Nitrogen And Phosphorus ◽  
Podzolic Soils ◽  
Forestry Management ◽  
Order Of Magnitude ◽  
Reactive Phosphorus ◽  
Stream Nitrate

Abstract. The effect of felling on stream nitrate, ammonium and soluble reactive phosphate (SRP) concentrations is examined for acidic and acid sensitive Sitka Spruce afforested catchments with podzolic and gley soils in mid-Wales. For the streams draining the felled podzolic areas, the concentrations of nitrate can be up to an order of magnitude higher than pre-fell values and post-fell concentrations can even be lower than the pre-fell values. Felling for the podzolic soils barely leads to any changes in ammonium or SRP concentration. For the gley soils, felling results in an order of magnitude increase in nitrate, ammonium and SRP for a small drainage ditch, but the pulse is much reduced before it reaches the main Nant Tanllwyth channel. Rather, within-catchment and within-stream processes not only imbibe nitrate, ammonium and SRP fluxes generated, but in the case of nitrate, concentrations with- and post-felling are lower than pre-felling concentrations. The flux changes involved are described in terms of (a) input-output relationships and (b) "felling disruption" and "felling recovery responses". The findings are linked to issues of hydrobiological controls and forestry management. Keywords: Plynlimon, Hafren, Hore, streams, nitrate, ammonium, SRP, phosphorus, soluble reactive phosphorus, phosphate, orthophosphate, Sitka spruce, forestry, felling, podzol, gley

scholarly journals Driving Factors of Geosmin Appearance in a Mediterranean River Basin: The Ter River Case

2021 ◽  
Vol 12 ◽  
Author(s):  
Carmen Espinosa ◽  
Meritxell Abril ◽  
Èlia Bretxa ◽  
Marta Jutglar ◽  
Sergio Ponsá ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
River Basin ◽  
Algal Blooms ◽  
Inorganic Nitrogen ◽  
Soluble Reactive Phosphorus ◽  
Drinking Water Treatment ◽  
Nutrient Concentrations ◽  
Mediterranean River

In recent decades, human activity coupled with climate change has led to a deterioration in the quality of surface freshwater. This has been related to an increase in the appearance of algal blooms, which can produce organic compounds that can be toxic or can affect the organoleptic characteristics of the water, such as its taste and odor. Among these latter compounds is geosmin, a metabolite produced by certain cyanobacteria that confers an earthy taste to water and which can be detected by humans at very low concentrations (nanogram per liter). The difficulty and cost of both monitoring the presence of this compound and its treatment is a problem for drinking water treatment companies, as the appearance of geosmin affects consumer confidence in the quality of the drinking water they supply. In this field study, the evaluation of four sampling sites with different physicochemical conditions located in the upper part of the Ter River basin, a Mediterranean river located in Catalonia (NE Spain), has been carried out, with the aim of identifying the main triggers of geosmin episodes. The results, obtained from 1 year of sampling, have made it possible to find out that: (i) land uses with a higher percentage of agricultural and industrial activity are related to high nutrient conditions in river water, (ii) these higher nutrient concentrations favor the development of benthic cyanobacteria, (iii) in late winter–early spring, when these cyanobacteria are subjected to both an imbalance of the dissolved inorganic nitrogen and soluble reactive phosphorus ratio, guided by a phosphorus concentration increase, and to cold–mild temperatures close to 10°C, they produce and release geosmin, and (iv) 1–2 weeks after cyanobacteria reach a high relative presence in the whole biofilm, an increase in geosmin concentration in water is observed, probably associated with the cyanobacteria detachment from cobbles and consequent cell lysis. These results could serve as a guide for drinking water treatment companies, indicating under what conditions they can expect the appearance of geosmin episodes and implement the appropriate treatment before it reaches consumers’ tap.

Biogeochemical Asynchrony: Ecosystem Drivers of Seasonal Concentration Regimes across the Great Lakes Basin

2020 ◽  
Author(s):  
Kimberly Van Meter ◽  
Nandita Basu ◽  
Danyka Byrnes
Keyword(s):  
Land Use ◽  
Phase Behavior ◽  
Nutrient Dynamics ◽  
Soluble Reactive Phosphorus ◽  
Low Flow ◽  
Nutrient Concentrations ◽  
Stream Metabolism ◽  
Great Lakes Basin ◽  
Discharge Data ◽  
Reactive Phosphorus

&lt;p&gt;Changes in seasonal climate regimes, and related changes in seasonal nutrient dynamics, are occurring across a range of climates and land use types. Although it is known that seasonal patterns in nutrient availability are key drivers of both stream metabolism and eutrophication, there has been little success in developing a comprehensive understanding of seasonal variations in nutrient export across watersheds or of the relationship between nutrient seasonality and watershed characteristics. In the present study, we have used concentration and discharge data from more than 200 stations across US and Canadian watersheds to identify (1) archetypal seasonal concentration regimes for nitrate, soluble reactive phosphorus, and total phosphorus, and (2) dominant watershed controls on these regimes across a gradient of climate, land use, and topography. Our analysis shows that less impacted watersheds, with more forested and wetland area, most commonly exhibit concentration regimes that are in phase with discharge, with concentration lows occurring during summer low-flow periods. Agricultural watersheds also commonly exhibit in-phase behavior, though the seasonality is usually muted compared to that seen in less impacted areas. With increasing urban area, however, nutrient concentrations frequently become essentially aseasonal or even exhibit clearly out-of-phase behavior. In addition, our data indicate that seasonal SRP concentration patterns may be strongly influenced by proximal controls such as the presence of dams and reservoirs. In all, these results suggest that human activity is significantly altering nutrient concentration regimes, with large potential consequences for both in-stream metabolism and eutrophication risk in downstream water bodies.&lt;/p&gt;

scholarly journals Anthropogenic nutrient pollution of coral reefs in Southern Bahia, Brazil

2007 ◽  
Vol 55 (4) ◽  
pp. 265-279 ◽  
Author(s):  
Ozeas S. Costa Jr.
Keyword(s):  
Soluble Reactive Phosphorus ◽  
Nutrient Concentrations ◽  
Nutrient Input ◽  
Nutrient Distribution ◽  
The World ◽  
Southern Bahia ◽  
Reactive Silica ◽  
Reactive Phosphorus ◽  
Oxidised Nitrogen ◽  
Dry And Rainy Seasons

Spatial, temporal and anthropogenic controls on nutrient distribution were evaluated for nearshore and offshore reefs at Porto Seguro Bay, Southern Bahia. Water samples were analysed for total oxidised nitrogen (TON), soluble reactive phosphorus (SRP), reactive silica (DSi), and chlorophyll a (Chl). The results indicate that rainfall promotes a significant (F=19.873, p<0.001) increase in the load of nutrients to nearshore (average 12% increase) and offshore reefs (average 31% increase). Nutrient concentrations at the urbanized reef (TON=1.93-3.21µM; SRP=0.57-0.89µM; DSi=8.48-11.15µM) are on average 25% higher than at non-urban reefs and over 200% higher than the offshore reef. The urbanized reef also presented the highest rates of increase in nutrient input between dry and rainy seasons (TON=+0.36µM; SRP=+0.08µM; DSi=+0.70µM). Differences in nutrient concentration between nearshore and offshore reefs are more pronounced during dry season, when the bulk of land-based nutrient contribution is confined to the nearshore reefs. SRP values in the study area ranked among the highest in the world for coral reef areas and phytoplankton growth appears to be nitrogen-limited.

Phosphorus and Nitrogen Dynamics in Streams Associated With Wildfire: a Study of Immediate and Longterm Effects

1998 ◽  
Vol 8 (4) ◽  
pp. 183 ◽  
Author(s):  
FR Hauer ◽  
CN Spencer
Keyword(s):  
Soluble Reactive Phosphorus ◽  
Early Years ◽  
Nutrient Concentrations ◽  
Nutrient Loads ◽  
Background Levels ◽  
Nitrogen Concentrations ◽  
Paired Watersheds ◽  
Reactive Phosphorus ◽  
Steep Terrain ◽  
In Fire

Stream nutrient data were collected both during a wildfire and over a subsequent five-year period. Sampling was from a series of paired watersheds located within and outside of the wildfire. Phosphorus and nitrogen concentrations increased from 5 to 60 fold over background levels during the first few days of the month-long wildfire with maximum recorded concentrations as high as 135 μg/L soluble reactive phosphorus, 261 μg/L ammonium, and 61 μg/L nitrate. Total phosphorus and total nitrogen during this same time period increased up to 206 μg/L and 349 mμg/L, respectively. Nutrient concentrations declined to background levels (<5-10 μg/L) within a few weeks after the fire. Over the following five years we observed dissolved nutrient concentrations reaching >40 μg/L soluble reactive phosphorus and >125 μg/L nitrate in impacted streams, concentrations >5 fold over those observed in control streams. In high gradient watersheds, all nutrients were easily transported to the streams with most notable impact during the early years after the fire. In less steep terrain, soluble reactive phosphorus concentrations were significantly higher 3 to 5 years after the fire, which also corresponded to relatively high spring hydrographs. In contrast, nitrogen compounds were observed to be significantly higher in concentration in fire impact streams in the years immediately following the fire. We attribute these differences in the rate of nutrient loads to be the result of the different mobilization mechanisms of phosphorus and nitrogen and the different soil and geomorphic settings of the watersheds drained by the different streams.

Sign in / Sign up

Export Citation Format

Share Document