Integrated ecological assessment of Danish Baltic Sea coastal areas by means of phytoplankton and macrophytobenthos

Sagert, Sigrid; Jensen, Dorte Krause; Henriksen, Peter; Rieling, T.; Schubert, Hendrik

doi:10.1016/j.ecss.2004.10.014

Cited by 32 publications

(13 citation statements)

References 35 publications

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“…Several marine studies have also recognised that the water clarity is a crucial factor for the survival and success of macrophytes (ZIMMERMAN et al, 1995;LONGSTAFF and DENNI-SON, 1999;SAGERT et al, 2005). DUARTE (1991) presented models relating Secchi depth to the lowest colonisation depth for several marine seagrass species.…”

Section: Macrophyte Cover and The Biological Value Of The Systemmentioning

confidence: 97%

Operational Effect Variables and Functional Ecosystem Classifications – a Review on Empirical Models for Aquatic Systems along a Salinity Gradient

Håkanson¹,

Bryhn

Blenckner

2007

International Review of Hydrobiology

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This paper presents a comparative study based on a very comprehensive set of empirical data from many international data bases including fresh water systems, coastal brackish water areas and marine coastal areas. We present a general trophic level classification system (oligotrophic, mesotrophic, eutrophic and hypertrophic categories) for sites/areas characterised by a wide range of salinities. This classification system targets on the following operational effect variables (bioindicators), which are meant to reflect key structural and functional aspects of aquatic ecosystems and characteristic (median) values for entire defined areas (the ecosystem scale) for the growing season: Secchi depth (as a standard measure of water clarity), chlorophyll-a concentrations (a measure of primary phytoplankton biomass), the oxygen saturation in the deep-water zone (an indicator reflecting sedimentation, oxygen consumption, oxygen concentrations and the habitat conditions for zoobenthos, an important functional group) and the macrophyte cover (an important variable for the bioproduction potential, including fish production, and the "biological value" of aquatic systems). For a wide range of systems, these bioindicators can be predicted using practically useful models, i.e., models based on variables that can be accessed from standard monitoring programs and maps. These bioindicators are regulated by a set of abiotic factors, such as salinity, suspended particulate matter (SPM), nutrient concentrations (N and P), morphometry and water exchange. Empirical data ultimately form the basis for most ecological/environmental studies and this work uses maybe the most comprehensive data set ever related to trophic level conditions. It also gives compilations of empirically-based (statistical) models quantifying how the variables are interrelated and how they reflect fundamental aspects of aquatic ecosystems.

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Section: Macrophyte Cover and The Biological Value Of The Systemmentioning

confidence: 97%

Operational Effect Variables and Functional Ecosystem Classifications – a Review on Empirical Models for Aquatic Systems along a Salinity Gradient

Håkanson¹,

Bryhn

Blenckner

2007

International Review of Hydrobiology

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“…An increased nutrient load increases phytoplankton biomass, which decreases light penetration into the water column (Schubert and Forster 1997). Light penetration is the main variable that limits the colonisation of macrophytes when an appropriate substrate is available (Sagert et al 2005). Thus, eutrophication has a major influence on the lower depth limit of macrophytes, and an upward shift of the depth limit can be regarded as a sign of vegetation degradation (Table 14.3).…”

Section: 41mentioning

confidence: 99%

Biological indicators

Zettler¹,

Darr²,

Labrenz³

et al. 2017

Biological Oceanography of the Baltic Sea

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Changes in living conditions caused by natural variability or anthropogenic activitieselicit distinct responses of species, populations and communities. Bioindication is the recording of such responses and the entity measured is called a "bioindicator". 2. A bioindicator can be any relevant component or measure that can be used to estimate the environmental status based on the performance of all types of organisms (prokaryotes, protists, macroalgae, vascular plants, invertebrates, fish, mammals), including bulk measurements such as the chlorophyll a concentration in the seawater or the lower depth limit of macrophytes. 3. To be able to conclude if environmental change has taken place based on bioindication, it is essential to have knowledge of the specific ecological requirements of the organisms with respect to their habitats. 4. Bioindication using individuals or species includes e.g. behavioural adaptations, modifications of organ and cell structures and changes in population dynamics. 5. Bioindication by recording dramatic increases or decreases in the proportion and/or density of species in a community provides a conspicuous sign of environmental change, especially when this includes the extinction of species. 6. Strong decreases and extinctions of species in a community coupled to immigration of non-indigenous species may signify a shift in community composition that has a bearing on the functioning of the entire ecosystem. 7. Bioindication is a major tool used in the implementations of the EU environmental legislation: the Habitats Directive (HD), the Water Framework Directive (WFD) and the Marine Strategy Framework Directive (MSFD).

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“…Filter-feeding shellfish therefore act as a circuit-breaker between the two stages and curtail the development of hypoxia and the alterations in underwater light climate, which lead to losses in submerged aquatic vegetation such as eelgrass (Sagert et al 2005;Dolch et al 2013).…”

Section: Water Quality Shellfish and European Legislationmentioning

confidence: 99%

Goods and services of extensive aquaculture: shellfish culture and nutrient trading

Ferreira

Bricker

2015

Aquacult Int

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Bivalve shellfish play an important role in top-down control of primary symptoms of eutrophication. This short-circuits the process of organic decomposition and promotes an enhancement of underwater light climate, improved oxygenation of bottom water, and restoration of submerged aquatic vegetation. This review analyses this ecosystem service as a potential actor in watershed-level nutrient credit trading programmes and explores the possibilities of implementation of such programmes in Europe. We examine the different components of the issue, including the eutrophication status of European coastal waters, legal and management instruments, and the use of mathematical models at both the ecosystem and farm scales to evaluate the potential removal of nitrogen by cultivated shellfish such as oysters, mussels, and clams. The annual European bivalve shellfish production of over 700,000 metric tons is estimated to generate a nitrogen removal of 46,800 t year -1 , equivalent to 14 9 10 6 population equivalent, and a minimum value of 507 9 10 6 €. We discuss future directions for this topic in Europe, drawing from ongoing research in the USA and elsewhere, in the light of the twin challenges of European aquaculture expansion and implementation of EU directives.

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Integrated ecological assessment of Danish Baltic Sea coastal areas by means of phytoplankton and macrophytobenthos

Cited by 32 publications

References 35 publications

Operational Effect Variables and Functional Ecosystem Classifications – a Review on Empirical Models for Aquatic Systems along a Salinity Gradient

Operational Effect Variables and Functional Ecosystem Classifications – a Review on Empirical Models for Aquatic Systems along a Salinity Gradient

Biological indicators

Goods and services of extensive aquaculture: shellfish culture and nutrient trading

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