Biological Invasions

, Volume 19, Issue 1, pp 239–254 | Cite as

Mapping an invasive bryophyte species using hyperspectral remote sensing data

  • Sandra Skowronek
  • Michael Ewald
  • Maike Isermann
  • Ruben Van De Kerchove
  • Jonathan Lenoir
  • Raf Aerts
  • Jens Warrie
  • Tarek Hattab
  • Olivier Honnay
  • Sebastian Schmidtlein
  • Duccio Rocchini
  • Ben Somers
  • Hannes Feilhauer
Original Paper

Abstract

Reliable distribution maps are crucial for the management of invasive plant species. An alternative to traditional field surveys is the use of remote sensing data, which allows coverage of large areas. However, most remote sensing studies on invasive plant species focus on mapping large stands of easily detectable study species. In this study, we used hyperspectral remote sensing data in combination with field data to derive a distribution map of an invasive bryophyte species, Campylopus introflexus, on the island of Sylt in Northern Germany. We collected plant cover data on 57 plots to calibrate the model and presence/absence data of C. introflexus on another 150 plots for independent validation. We simultaneously acquired airborne hyperspectral (APEX) images during summer 2014, providing 285 spectral bands. We used a Maxent modelling approach to map the distribution of C. introflexus. Although C. introflexus is a small and inconspicuous species, we were able to map its distribution with an overall accuracy of 75 %. Reducing the sampling effort from 57 to 7 plots, our models performed fairly well until sampling effort dropped below 12 plots. The model predicts that C. introflexus is present in about one quarter of the pixels in our study area. The highest percentage of C. introflexus is predicted in the dune grassland. Our findings suggest that hyperspectral remote sensing data have the potential to provide reliable information about the degree of bryophyte invasion, and thus provide an alternative to traditional field mapping approaches over large areas.

Keywords

Campylopus introflexus Dunes Heathland Imaging spectroscopy Maxent Moss 

Notes

Acknowledgments

This study is part of the ERA-Net BiodivERsA project DIARS (Detection of Invasive plant species and Assessment of their impact on ecosystem properties through Remote Sensing) with the national funders ANR (Agence Nationale de la Recherché), BelSPO (Belgian Federal Science Policy Office) and DFG (Deutsche Forschungsgemeinschaft). Sandra Skowronek is funded through DFG research grant FE 1331/3-1. The authors would like to thank the nature conservation authority of Northern Friesland and the private land owners for granting us permission to conduct research in the protected dune heathlands on the island of Sylt. Many thanks to Emily Jane Francis and Carol Garzon for proofreading the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Sandra Skowronek
    • 1
  • Michael Ewald
    • 2
  • Maike Isermann
    • 3
  • Ruben Van De Kerchove
    • 4
  • Jonathan Lenoir
    • 5
  • Raf Aerts
    • 6
  • Jens Warrie
    • 6
  • Tarek Hattab
    • 5
  • Olivier Honnay
    • 6
  • Sebastian Schmidtlein
    • 2
  • Duccio Rocchini
    • 7
  • Ben Somers
    • 8
  • Hannes Feilhauer
    • 1
  1. 1.Institute of GeographyUniversity of Erlangen-NurembergErlangenGermany
  2. 2.Institute of Geography and GeoecologyKarlsruhe Institute of TechnologyKarlsruheGermany
  3. 3.Working Group Vegetation Ecology and Conservation BiologyUniversity of BremenBremenGermany
  4. 4.VITO (Flemish Institute for Technological Research)MolBelgium
  5. 5.UR “Ecologie et dynamique des systèmes anthropisées” (EDYSAN, FRE3498 CNRS-UPJV)Université de Picardie Jules VerneAmiens Cedex 1France
  6. 6.Ecology, Evolution and Biodiversity Conservation SectionKU LeuvenLouvainBelgium
  7. 7.Department of Biodiversity and Molecular EcologyFondazione Edmund MachSan Michele all’AdigeItaly
  8. 8.Department of Earth and Environmental Sciences, Division of Forest, Nature and LandscapeKU LeuvenLeuvenBelgium

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