A dynamic model describing the seasonal variations in growth and the distribution of eelgrass (Zostera marina L.) I. Model theory

Bach, Hanne

doi:10.1016/0304-3800(93)90125-c

Cited by 50 publications

(30 citation statements)

References 17 publications

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“…values for each studied plant species are shown in table I. The air temperature function is described in equation 4 (Bach, 1993):…”

Section: Modelmentioning

confidence: 99%

“…Because of increasing human fossil fuel use since the beginning of intensive industrial activity (Houghton, 1999), the world has experienced an increase in atmospheric CO 2 . It is widely believed that anthropogenic additions of CO 2 to the atmosphere are contributing to increase surface temperatures worldwide, a phenomenon known as the ''greenhouse effect'' (Bluemle et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Modelling the effects of global temperature increase on the growth of salt marsh plants

Couto

Martins²,

Duarte³

et al. 2014

Appl Ecol Env Res

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Abstract.Gradual increases in temperature and atmospheric CO 2 concentrations have resulted from the increased human use of fossil fuels since the beginning of industrial activity. In coastal wetland ecosystems, salt marshes constitute important habitats because they play important ecological roles, acting as carbon sinks by capturing atmospheric CO 2 and storing it in living plant tissue. Ecological models are important tools for understanding the results of anthropogenic impacts on a global scale. Global warming poses threats to salt marshes through different effects, e.g., increases in sea level. The objectives of this study were i) to assess how temperature increases will influence the growth of salt marsh plants, ii) to infer the carbon budget of salt marshes under temperature increase scenarios and iii) to predict how salt marsh plants will keep pace with increases in sea level. These goals were achieved by developing growth models of three different plants (Spartina maritima, Scirpus maritimus and Zostera noltei) found in the Mondego estuary. Models were developed for C 3 and C 4 plant species. The results suggest that a temperature increase enhances the aboveground biomass of salt marsh plants. According to the predictions of the models, the sedimentation rate of S. maritima and Z. noltei can keep pace with increases in sea level, but this is apparently not the case for S. maritimus. If S. maritimus disappears from the Mondego estuary, the carbon sequestration ability of the system should decrease due to the loss of active plant tissue. This conclusion is based on the fact that S. maritimus accumulated more than 80% of the total carbon sequestered in the tissues by the three studied species.

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“…values for each studied plant species are shown in table I. The air temperature function is described in equation 4 (Bach, 1993):…”

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling the effects of global temperature increase on the growth of salt marsh plants

Couto

Martins²,

Duarte³

et al. 2014

Appl Ecol Env Res

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“…Days with temperatures above 30°C, the temperature above which meristem tissues become anoxic due to interactions between temperature and external dissolved oxygen concentrations [Greve et al, 2003] and large summer die offs have been witnessed [Moore and Jarvis, 2008], were also separately counted to examine the different effect on seagrass dynamics ) is the critical shear stress to erode sediment [Lawson et al, 2007]. max resp Respiratory loss rate 0.014 per day [Bach, 1993]. max pht Maximum specific growth rate 0.095 per day [Bach, 1993] of long winters versus hot summers.…”

Section: Model Application and Environmental Driversmentioning

confidence: 99%

Stability and resilience of seagrass meadows to seasonal and interannual dynamics and environmental stress

et al. 2012

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[1] Shallow coastal bays provide habitat for diverse fish and invertebrate populations and are an important source of sediment for surrounding marshes. The sediment dynamics of these bays are strongly affected by seagrass meadows, which limit sediment resuspension, thereby providing a more favorable light environment for their own survival and growth. Due to this positive feedback between seagrass and light conditions, it has been suggested that bare sediment and seagrass meadows are potential alternate stable states of the benthos in shallow coastal bays. To investigate the stability and resilience of seagrass meadows subjected to variation in environmental conditions (e.g., light, temperature), a coupled model of vegetation-sediment-water flow interactions and vegetation growth was developed. The model was used to examine the effect of dynamically varying seasonal and interannual seagrass density on sediment resuspension, water column turbidity, and the subsequent light environment on hourly time steps and then run over decadal time scales. A daily growth model was designed to capture both belowground biomass and the growth and senescence of aboveground biomass structural components (e.g., leaves and stems). This allowed us to investigate how the annual and seasonal variability in shoot and leaf density within a meadow affects the strength of positive feedbacks between seagrass and their light environment. The model demonstrates both the emergence of bistable behavior from 1.6 to 1.8 m mean sea level due to the strength of the positive feedback, as well as the limited resilience of seagrass meadows within this bistable range.

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“…Eqs (1)- (3) refer to the three main groups of primary producers [8] -eelgrass C m (as Zostera), macro-algae C al (as Ulva) and micro-algae or phytoplankton C ph (as Chlorella) -whose vegetal growth, by photosynthesis, is controlled by environmental factor -light, temperature, lagoon hydrodynamics -and by the physiological characteristics of the particular vegetal specie; the three species differ respect to nutrient uptake, growth and organic detritus production rates. The eelgrass (as Zostera) is a rooted vegetal specie, while the other two are floating ones; eelgrass assimilates phosphorous mainly by root-rhizomes from the interstitial water of the sediment [1] and it growths starting from the bottom of the water column, then the vegetation extends to the upper layers of the water column once a maximum vegetal concentration (C max in Eq. (3)) is reached in the lower layers.…”

Section: Hypothesis and Model Equationsmentioning

confidence: 99%

“…Lagoon ecosystems exhibit a complex dynamic which is due to non linear interactions of biological, chemical and hydrodynamic processes that influence the cycles of carbon (vegetal growth, organic detritus production and mineralization), nutrients, sulphur, and of all those species playing any role in ecological phenomena [1,5,7,8]. Such a dynamic is influenced by various external forcing variables -tidal flow rate, wind speed, temperature, light intensity, nutrient external load -that in most of the cases are periodical or multi-periodical.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of lagoon ecosystems

Cioffi¹,

Cannata²

2006

WIT Transactions on Ecology and the Environment, Vol 95

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The dynamic behaviour of a lagoon ecosystem is investigated by using an eutrophication model. The phosphorous external load is assumed as control parameter. The response diagram, obtained by simulation, varying the value of control parameter, shows the existence of different ranges of stability of the ecosystem, characterized by the dominance of a specific group of primary produces and by a different ecosystem vulnerability to Summer water anoxia. A catastrophic bifurcation occurs for a critical value of the control parameter, which manifests as an abrupt change of the dominant specie from eelgrass to macroalgae. The serious consequences of such a selection in terms of eutrophication processes, anoxic crisis vulnerability and management policies for ecosystems subject to alternate states are emphasised.

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A dynamic model describing the seasonal variations in growth and the distribution of eelgrass (Zostera marina L.) I. Model theory

Cited by 50 publications

References 17 publications

Modelling the effects of global temperature increase on the growth of salt marsh plants

Modelling the effects of global temperature increase on the growth of salt marsh plants

Stability and resilience of seagrass meadows to seasonal and interannual dynamics and environmental stress

Dynamics of lagoon ecosystems

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