Trend monitoring of the areal extent of habitats in a subsiding coastal area by spatial probability sampling

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    Abstract

    The European Habitats Directive requires a regular reporting of areal changes of the Habitat types definedunder this Directive. To monitor changes in Habitat types in a dune and salt meadow area in the easternpart of the back-barrier island of Ameland (The Netherlands) a sampling scheme was designed suitablefor both unbiased estimation of such changes and for mapping the Habitat types. As a space–time designa supplemented panel was chosen, with a proportion of permanent plots of 0.5. Sampling plots wereselected by probability sampling, with sampling designs that spread the plots evenly over the study area.These design decisions are motivated in the paper. Eight vegetation types were distinguished, corre-sponding to six Habitat types. The areal extent of the ‘grey dunes’ type significantly decreased over theobservation period, whereas the extents of two ‘salt meadow’ types significantly increased. This has tobe considered as a loss of habitat quality. It is doubtful whether for the Natura 2000 area in its entirety,wherein we expect smaller rates of change compared to our study area, it will be possible to detect arealchanges in Habitat types at acceptable costs and within the requested six-year periods. The supplementedpanel design performed nearly equal to a pure panel design (all plots permanent) in terms of precisionof estimated linear trends, but was by far superior to an independent synchronous design with all plotschanging.
    LanguageEnglish
    Pages313-319
    JournalEcological Indicators
    Volume45
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    habitat type
    monitoring
    sampling
    habitat
    habitats
    dune
    dunes
    meadows
    barrier island
    salts
    habitat quality
    vegetation type
    habitat destruction
    vegetation types
    trend
    coastal area
    Habitat
    Coast
    Monitoring
    Sampling

    Keywords

    • design
    • diversity
    • soil
    • resources
    • space
    • time

    Cite this

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    title = "Trend monitoring of the areal extent of habitats in a subsiding coastal area by spatial probability sampling",
    abstract = "The European Habitats Directive requires a regular reporting of areal changes of the Habitat types definedunder this Directive. To monitor changes in Habitat types in a dune and salt meadow area in the easternpart of the back-barrier island of Ameland (The Netherlands) a sampling scheme was designed suitablefor both unbiased estimation of such changes and for mapping the Habitat types. As a space–time designa supplemented panel was chosen, with a proportion of permanent plots of 0.5. Sampling plots wereselected by probability sampling, with sampling designs that spread the plots evenly over the study area.These design decisions are motivated in the paper. Eight vegetation types were distinguished, corre-sponding to six Habitat types. The areal extent of the ‘grey dunes’ type significantly decreased over theobservation period, whereas the extents of two ‘salt meadow’ types significantly increased. This has tobe considered as a loss of habitat quality. It is doubtful whether for the Natura 2000 area in its entirety,wherein we expect smaller rates of change compared to our study area, it will be possible to detect arealchanges in Habitat types at acceptable costs and within the requested six-year periods. The supplementedpanel design performed nearly equal to a pure panel design (all plots permanent) in terms of precisionof estimated linear trends, but was by far superior to an independent synchronous design with all plotschanging.",
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    author = "D.J. Brus and P.A. Slim and A.H. Heidema and {van Dobben}, H.F.",
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    AU - Slim, P.A.

    AU - Heidema, A.H.

    AU - van Dobben, H.F.

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    N2 - The European Habitats Directive requires a regular reporting of areal changes of the Habitat types definedunder this Directive. To monitor changes in Habitat types in a dune and salt meadow area in the easternpart of the back-barrier island of Ameland (The Netherlands) a sampling scheme was designed suitablefor both unbiased estimation of such changes and for mapping the Habitat types. As a space–time designa supplemented panel was chosen, with a proportion of permanent plots of 0.5. Sampling plots wereselected by probability sampling, with sampling designs that spread the plots evenly over the study area.These design decisions are motivated in the paper. Eight vegetation types were distinguished, corre-sponding to six Habitat types. The areal extent of the ‘grey dunes’ type significantly decreased over theobservation period, whereas the extents of two ‘salt meadow’ types significantly increased. This has tobe considered as a loss of habitat quality. It is doubtful whether for the Natura 2000 area in its entirety,wherein we expect smaller rates of change compared to our study area, it will be possible to detect arealchanges in Habitat types at acceptable costs and within the requested six-year periods. The supplementedpanel design performed nearly equal to a pure panel design (all plots permanent) in terms of precisionof estimated linear trends, but was by far superior to an independent synchronous design with all plotschanging.

    AB - The European Habitats Directive requires a regular reporting of areal changes of the Habitat types definedunder this Directive. To monitor changes in Habitat types in a dune and salt meadow area in the easternpart of the back-barrier island of Ameland (The Netherlands) a sampling scheme was designed suitablefor both unbiased estimation of such changes and for mapping the Habitat types. As a space–time designa supplemented panel was chosen, with a proportion of permanent plots of 0.5. Sampling plots wereselected by probability sampling, with sampling designs that spread the plots evenly over the study area.These design decisions are motivated in the paper. Eight vegetation types were distinguished, corre-sponding to six Habitat types. The areal extent of the ‘grey dunes’ type significantly decreased over theobservation period, whereas the extents of two ‘salt meadow’ types significantly increased. This has tobe considered as a loss of habitat quality. It is doubtful whether for the Natura 2000 area in its entirety,wherein we expect smaller rates of change compared to our study area, it will be possible to detect arealchanges in Habitat types at acceptable costs and within the requested six-year periods. The supplementedpanel design performed nearly equal to a pure panel design (all plots permanent) in terms of precisionof estimated linear trends, but was by far superior to an independent synchronous design with all plotschanging.

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