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Data paper

The distribution of the vascular plants on the North Frisian Island, Amrum

expand article info Quentin John Groom
† Agentschap Plantentuin Meise, Meise, Belgium
Open Access

Abstract

Amrum is a small barrier island on the north-west coast of Germany. The distribution of vascular plants was examined by surveying their 1km2 grid square occupancy across the whole island. These data were used in a study on the recent vegetation change in the island. These data include 3786 observations of 450 taxa collected in two surveys in 2007 and 2008.

Keywords

Amrum, vascular plants, plant survey

Introduction

Amrum is a small barrier island off the coast of Schleswig-Holstein, Germany. It covers an area of about 20 km2, though considerable areas of saltmarsh vegetation are exposed at low tide. Amrum has been the subject of many botanical surveys and this survey continues that tradition (Christiansen 1961, Türk 1994, Petersen 2000, von Seemen 1899, Schiøtz 1860).

Amrum is approximately 10 km long and 3 km wide at its widest point (Fig. 1). Its main habitats run in north-south bands along the island. In the west are open sand flats with a sparse fore-dune vegetation, moving eastward there is a complete dune succession ending in conifer plantations. Beyond the plantations is arable farmland and grazing. Along the eastern shore are mainly saltmarshes and mudflats. Other important habitats include freshwater ponds, marshes and ditches, heathland, urban areas and the seawall.

Figure 1.

A map of Amrum showing the main landscape features and the 1km2 grid used for the survey. The grid is based upon the spatial reference system EPSG:31467 - DHDN / Gauss-Kruger zone 3.

These data were used in a study of change in the islands flora (Groom 2010). They are published in the hope that they will help future studies.

Sampling methods
Study extent: 

The survey covered all vegetated areas of the island were access was permitted. In fact, this covers most of the island, however, some nesting bird colonies and private gardens are completely inaccessible.

Sampling description: 

The biodiversity of each 1 km2 varies considerable so there was no set time limit for surveying a particular square. Grid squares were surveyed as intensively as considered necessary to find all but the rarest species. Aerial photographs, maps, previous surveys and local experts were all used to direct surveying to all potentially important habitats. The grid is based upon the spatial reference system EPSG:31467 - DHDN / Gauss-Kruger zone 3 (Fig. 1).

Quality control: 

Some Salix specimens where identified by R.D. Meikle.

Geographic coverage
Description: 

Amrum is one of the North Frisian Islands, Schleswig-Holstein, Germany. Its western coast faces the North Sea and the eastern coast faces the Wadden Sea (Fig. 1).

Coordinates: 54° 36' 22.9602" and 54° 42' 44.1936" Latitude; 8° 17' 26.5308" and 8° 24' 12.6138" Longitude.
Taxonomic coverage
Description: 

The study covers all vascular plants growing in the wild. Obviously cultivated plants were excluded, though trees planted for forestry were included as these form so much of the island's habitats. Some examples of natural habitats on Amrum are illustrated (Fig. 2).

Figure 2.

Examples of some of the habitats and plants found on Amrum.

aMobile foredunes containing Ammophila arenaria, Rumex crispus, Sonchus arvensis and Elytrigia juncea.
bA mature wet dune slack, habitat to Erica tetralix and Eriophorum angustifolium.
c Calluna vulgaris heath on stabilized dunes, taken from the lighthouse called the Quermarkenfeuer (54°40'9.25"N, 8°18'30.84"E).
d Salix cinerea carr at the western end of the Nehrungssee (54°37'22.77"N, 8°22'0.42"E).
e Bolboschoenus maritimus
f Limonium vulgare
Temporal coverage
Data range: 
2008 7 05 - 2008 7 20; 2007 8 17 - 2007 8 31.
Usage rights
Use license: 
Creative Commons CCZero
Data resources
Data package title: 
Vascular plant survey of Amrum 2007-2008
Number of data sets: 
1
Data set name: 
Survey of the whole island
Character set: 
UTF-8
Data format: 
Darwin Core archive
Data format version: 
1
Column label Column description
genus The genera of the taxon.
specificEpithet The specific epithet of the taxon.
taxonRank The taxonomic rank of the name.
infraspecificEpithet The infraspecific name of the taxon, if identified to this rank.
scientificName full scientific names, written out as a string with authority.
kingdom The taxonomic kingdom to which the organism belongs.
family The taxonomic family to which the organism belongs.
vernacularName The English common name of the taxon.
nomenclaturalCode International Code of Nomenclature for the name.
identifiedBy The identifier of the specimen.
recordedBy The person who found the specimen.
language The language used in the observation details.
rights The rights given to the use of these data.
rightsHolder The person to whom these right belong.
datasetID A unique identifier to this dataset.
datasetName The name of this dataset.
basisOfRecord How the observation was made.
occurrenceStatus An indication of the about the presence or absence of a taxon at a location.
individualCount The number of individuals observed. If left blank the taxon was observed, but not counted.
eventDate The date on which the observation occurred.
month The month in which the observation occurred.
year The year in which the observation occurred.
occurrenceRemarks Additional notes on the observation.
establishmentMeans How the taxon became established at the location. Frequently used where the taxon was planted.
occurrenceID A unique identifier to the observation.
locality A textual description of the precise locality.
higherGeography A textual description of the region in which the observation occurred.
islandGroup The name of the island group in which the observation occurred.
island The name of the island in which the observation occurred.
country The name of the country in which the observation occurred.
countryCode The ISO 3166-1-alpha-2 country code.
stateProvince The first-level administrative subdivision of the country in which the observation occurred.
continent The continent in which the observation occurred.
verbatimCoordinates The geographic coordinates of the observation written out.
verbatimSRS The spatial reference system of the verbatim coordinates.
footprintWKT A Well-Known Text (WKT) representation of the shape that defines the location.
footprintSRS The spatial reference system of the footprint WKT coordinates.
habitat A textual description of the habitat in which the taxon was observed.
coordinateUncertaintyInMeters The limit of the distance (in meters) from the given coordinates describing a circle within which the locality must lie.
decimalLongitude The longitude of the location the observation was made, in decimal degrees.
decimalLatitude The latitude of the location the observation was made, in decimal degrees.
geodeticDatum The geodetic datum to which the latitude and longitude refer.
pointRadiusSpatialFit The ratio of the area of the point-radius to the actual area of the spatial representation of the location

References

Supplementary material

Suppl. material 1: The distribution of the vascular plants on the North Frisian Island, Amrum
Authors:  Quentin J. Groom
Data type:  occurrences
Brief description: 

A Darwin Core Archive of vascular plant occurrences from the island of Amrum, Germany recorded in 2007 and 2008