Dataset of diatoms in Dutch moorland pools: 1916 - 2022

Registros de Dados

Os dados deste recurso de evento de amostragem foram publicados como um Darwin Core Archive (DwC-A), que é o formato padronizado para compartilhamento de dados de biodiversidade como um conjunto de uma ou mais tabelas de dados. A tabela de dados do núcleo contém 407 registros.

Também existem 1 tabelas de dados de extensão. Um registro de extensão fornece informações adicionais sobre um registro do núcleo. O número de registros em cada tabela de dados de extensão é ilustrado abaixo.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Versões

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Como citar

Pesquisadores deveriam citar esta obra da seguinte maneira:

van Dam H, Creuwels J, Geurts K (2024). Dataset of diatoms in Dutch moorland pools: 1916 - 2022. Version 1.1. Stichting Bargerveen. Samplingevent dataset. https://ipt.nlbif.nl/resource?r=st_bargerveen_diatoms&v=1.1

Direitos

Pesquisadores devem respeitar a seguinte declaração de direitos:

O editor e o detentor dos direitos deste trabalho é Stichting Bargerveen. To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction.

GBIF Registration

Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: 0446df64-a3be-49e4-b9b9-c05218773da3.  Stichting Bargerveen publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por Netherlands Biodiversity Information Facility.

Palavras-chave

recovery; acidification; moorland pools; soft water lakes; Specimen

Contatos

Cobertura Geográfica

This dataset contains data collected from various moorland pools across the Netherlands.

Cobertura Taxonômica

Various diatom species.

Cobertura Temporal

Dados Sobre o Projeto

Nenhuma descrição disponível

O pessoal envolvido no projeto:

Métodos de Amostragem

1. Diatoms from the intensively sampled pools were collected two times a year (May and November) from 1978 to 2022, along with records of water level and samples for surface water chemistry. In the extensively sampled pools, diatoms were collected in summer or early autumn every four years from 1978 to 2012, along with chemical samples. 2. Samples were taken with a plankton net (mesh size 30-40 µm) pulled slightly through macrophytes if present, and slightly through the upper sediment layer. Until 2010 the samples were preserved with formaldehyde (4%), later on the samples were stored at -12 °C. 3. In addition to these 'recent' samples, net samples collected by J. Heimans in the years 1916 - 1932 (now in Naturalis Biodiversity Centre, Leiden) were examined, supplemented with samples from later years from employees of the former Research Institute for Nature Management (now in Meise Botanic Garden). We have made all efforts to ensure the comparability of our sampling method with the historical sample methods. 4. In the laboratory, HCl (10%) was added to remove the diatoms from the macrophyte fragments and to dissolve iron (when present). After rinsing several times with H2O, the organic material was digested by warming (80 °C) in H2O2 (30%). From 2014 onwards, KMnO4 was added after this step to end the oxidation process. After rinsing several times with H2O, slides were prepared by embedding the diatom valves in Naphrax. The slides were examined under oil immersion using a Zeiss Standard RA or Axioskop 40 microscope and phase contrast objective (x 100, NA = 1.30, total magnification x 1250). 5. During the first years of the project, diatoms were identified using van der Werff & Huls (1957-1974) and Hustedt (1927-1966, 1930) as main reference works and special publications as listed by van Dam (1984). Krammer & Lange-Bertalot (1986-1991) was used as a central reference in the following decades, supplemented by many special publications, as listed in van Dam (1984) and van Dam & Mertens (2019). The taxonomy in the checklist by van Dam et al. (1994) is used as a base-line in the present study, with some exceptions: Eunotia bilunaris var. mucophila Lange-Bertalot et al. is included in E. bilunaris (Ehrenberg) Mills, E. steineckii Petersen is included in E. exigua (De Brébisson) Rabenhorst, Frustulia rhomboides var. crassinervia (De Brébisson) Ross is included in F. saxonica Rabenhorst, Navicula heimansioides Lange-Bertalot is included in N. leptostriata E.G. Jørgensen. The group around N. subtilissima Cleve is combined to the genus Kobayasiella Lange-Bertalot. The nomenclature is adapted to the most recent insights (Guiry & Guiry, 2021). 6. In each slide, 400 valves were counted. The per cent abundance of each taxon was calculated after counting.

Descrição dos passos do método:

1. The identifications of the original counts were adapted to the most recent taxonomical and nomenclatural insights to create an homogeneous database.

Dados de Coleção

Citações bibliográficas

1. M.L. Franssen, K. Geurts, A. Mertens & H. van Dam (2024). Het referentiemeetnet vennen; langetermijnmonitoring van verzuring en klimaatverandering: temperatuur, hydrologie, chemie, kiezelwieren 1978-2022. Stichting Bargerveen, Nijmegen / Adviseur Water en Natuur, Amsterdam. 119p. http://edepot.wur.nl/654984
2. H. van Dam & A. Mertens (2023). A century of diatom monitoring in acidified and warmed Dutch moorland pools. Limnologica 99(126059): 1-13 https://doi.org/10.1016/j.limno.2023.126059

Metadados Adicionais