The estimation of species richness of Dutch bryophytes between 1900 and 2011. Documentation of VBA-procedures based on the Frescalo program

Research output: Book/ReportReportProfessional

Abstract

In 2011 the Ministery of Economic Affairs, Agriculture and Innovation asked the BLWG to update the Dutch Red List of bryophytes. The Red List is derived from distribution data recorded between 1900 and 2011 on a quadrant basis (5 x 5 km squares). The Dutch recording grid for distribution data consists of 1476 quadrants. The proper estimation of species richness for different time periods requires a method to correct for recording bias. We used the method and Frescalo program published recently by Hill (2012). This BLWG-report documents the implementation of the Frescalo program in Visual Basic for Applications (MS Access 2010) including modules for input/output and describes the corresponding database structure. Additional analyses evaluate parameter settings. The Frescalo program estimates species richness by evaluating local frequencies in neighbourhoods of each quadrant. The VBA-version determines neighbourhoods by considering physical distance and abiotic similarity (features of soil, ground water and geomorphology). Model output mainly depends on 1) the size of the neighbourhood used to estimate local species frequencies; 2) the proportion of local benchmark species used to estimate sampling intensity; 3) the expected mean neighbourhood frequency (assumed to be independent of species richness). Frescalo output is used to calculate the expected number of quadrants per species for each decade between 1900 and 2011.
Original languageEnglish
PublisherKNNV
Number of pages44
Publication statusPublished - 2013

Publication series

NameBLWG-rapport
PublisherKNNV
No.15
ISSN (Print)1571-5108

Keywords

  • mosses
  • bryophyta
  • endangered species
  • extinction
  • flora
  • netherlands

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