Diatoms from Deserta Grande (Madeira Archipelago, Portugal)

Vítor Gonçalves1, Catarina Ritter1, Helena Marques2, Dinarte Teixeira3, Pedro Miguel Raposeiro4, Vitor Gonçalves1, Helena Marques1, Helena Marques1

1 Faculty of Sciences and Technology, University of the Azores, Campus de Ponta Delgada Rua da Mãe de Deus, s/n Complexo Científico, 9500-321 Ponta Delgada, Ponta Delgada, Portugal; 2 Faculty of Sciences and Technology, University of the Azores, Rua da Mãe de Deus, s/n Complexo Científico, 9500-321 Ponta Delgada, Ponta Delgada, Portugal; 3 Instituto das Florestas e Conservação da Natureza IP-RAM, Jardim Botânico da Madeira, Eng. Rui Vieira, Caminho do Meio, Bom Sucesso, 9064-512 Funchal, Funchal, Portugal; 4 CIBIO, Research Center in Biodiversity and Genetic Resources, InBIO Associate Laboratory / Faculty of Sciences and Technology, University of the Azores, Campus de Ponta Delgada Rua da Mãe de Deus, s/n Complexo Científico, 9500-321 Ponta Delgada, Ponta Delgada, Portugal

Corresponding author(s): Vítor Gonçalves (vitor.mc.goncalves@uac.pt)Catarina Ritter (catarinaritter@hotmail.com)Helena Marques (helena.ma.marques@uac.pt)Dinarte Teixeira (teixeira.dinarte@gmail.com)Pedro Miguel Raposeiro (pedro.mv.raposeiro@uac.pt), Helena Marques (helena.ma.marques@uac.pt)

Received {date}; Revised {date}; Accepted {date}; Published {date}

Citation: Combination of authors, year of data paper publication (in parentheses), Title, Journal Name, Volume, Issue number (in parentheses), and doi of the data paper.

Resource Citation

Gonçalves V, Ritter C, Marques H, Teixeira D, Raposeiro P M (2020): Diatoms from Deserta Grande (Madeira Archipelago, Portugal). v1.3. Universidade dos Açores. Dataset/Occurrence. http://ipt.gbif.pt/ipt/resource?r=diatdes&v=1.3

Abstract

This dataset presents the distribution and diversity of epilithic diatoms collected in two field campaings at Deserta Grande Island (Madeira archipelago, Portugal).

Keywords: Bacillariophyta, oceanic islands, freshwater systems, terrestrial systems, Madeira archipelago, Desertas subarchipelago

Project details

Project title: Diatom from Deserta Grande (Madeira Archipelago, Portugal)
Personnel: Vitor Gonçalves, Pedro Miguel Raposeiro
Funding: This work was funded by national funds through FCT – Foundation for Science and Technology under the PTDC/CTA-AMB/28511/2017 and DL57/2016/ICETA/EEC2018/25.
Study area descriptions/descriptor: Desertas subarchipelago is formed by three uninhabited small islets belonging to the Madeira Archipelago located 20 km southeast of Madeira Island. Deserta Grande is the largest of the three islets, with an area of approximately 10 km2 and a maximum altitude of 479 m. The Deserta Grande geomorphology is mostly rugged, with very steep slopes, ridges and peaks. The climate is temperate oceanic and the predominant habitats are rocky slopes and small arid flatlands, with sparse vegetation. Although fauna and flora of Desertas Islands are regarded as interesting and with high conservation value, freshwater biota was never study. Freshwater habitats are reduced to temporary streams in Vale da Castanheira.
Design description: Several freshwater habitats were sampled during two field campaigns in Deserta Grande, in 2013 and 2014.
Diatom samples were collected by filtering water or by brushing the bottom and walls of the pools or stream bed. Samples were treated with warm nitric acid and mounted with Naphrax©. Diatoms slides were examined under 1000x magnification using a light microscope ZEISS AXIOIMAGE A1 with differential interference contrast. Species identification followed European diatom floras. At least 400 valves were counted in each sample.

Data published through GBIF: http://ipt.gbif.pt/ipt/resource?r=diatdes

Taxonomic coverage

General taxonomic coverage description: Epilithic diatoms from Deserta Island (Deserta sub archipelago, Madeira Archipelago, Portugal).
Taxonomic ranks
Phylum: Bacillariophyta
Common names: Diatom

Spatial coverage

General spatial coverage: The Desertas sub-archipelago is located 20 km southeast of Madeira Island. Deserta Grande is the largest of the three islets, with an area of approximately 10 km2 and a maximum altitude of 479 m.
Coordinates: 32°23'45.6''N and 32°36'14.4''N Latitude; 16°33'46.8''W and 16°26'56.4''W Longitude 

Temporal coverage: September 18, 2013

Temporal coverage: April 14, 2014

Methods

Method step description: Diatom slides were mounted with Naphrax, and at least 400 valves per sample. were counted and identified to species or variety level under oil-immersion phase contrast light microscopy using a ZEISS AXIOIMAGE A1 microscope. General diatom floras were consulted for diatom identification.
Study extent description: Diatoms were sampled from several freshwater habitats were sampled during two field campaigns in Deserta Grande, in 2013 and 2014.
Sampling description: Diatoms were sampled with help of a toothbrush to remove the biofilm and placed into a tray with a little water. The resulting suspension was collected in a plastic bottle, fixed with Lugol iodine and stored prior to analysis.
Quality control description: Samples for diatom analysis were following the National and European recommendations.

Datasets

Dataset description
Object name: Darwin Core Archive Diatoms from Deserta Grande (Madeira Archipelago, Portugal)
Character encoding: UTF-8
Format name: Darwin Core Archive format
Format version: 1.0
Distribution: http://ipt.gbif.pt/ipt/archive.do?r=diatdes
Publication date of data: 2020-10-21
Language: English
Licences of use: Creative Commons Attribution (CC-BY) 4.0 License

Metadata language: English
Date of metadata creation: 2020-04-17
Hierarchy level: Dataset