Observations on bird clutches by Bernard van Dooren in the Brabantse Kempen, The Netherlands and beyond.

Frank de Miranda; Jan van Dooren; Jeroen Creuwels

doi:10.15468/h6vvbn

Observations on bird clutches by Bernard van Dooren in the Brabantse Kempen, The Netherlands and beyond.

Citation

de Miranda F, van Dooren J, Creuwels J (2024). Observations on bird clutches by Bernard van Dooren in the Brabantse Kempen, The Netherlands and beyond.. Version 1.8. Netherlands Ornithologists' Union (NOU). Occurrence dataset https://doi.org/10.15468/h6vvbn accessed via GBIF.org on 2024-12-12.

Description

The dataset concerns 690 clutches with collected bird eggs and approximately 4500 found but not collected clutches, mostly in The Netherlands. Much information was available about each clutch from the collector Bernard van Dooren. This included: locality, number of eggs, reference date, status of breeding (lightly bred, severely bred), number of young on reference date, number of young eventually ringed, ring numbers, nest height, habitat and other ecological data. The egg collection is preserved in Naturalis, Leiden as well as the eight notebooks with detailed observations on the clutches by Bernard van Dooren.

Purpose

Digitizing notebooks of Bernardus van Dooren with detailed information on found and collected clutches in the 1930s up to the 1970s. These notes have a high historical value and are a rich source of data on the breeding biology and breeding distribution of birds in the Kempen area, province of Noord-Brabant, The Netherlands at that time. The full dataset can be found at Zenodo , NLBIF community.

Sampling Description

Study Extent

Most clutches are collected in the De Kempen by collector Bernard van Dooren in the 1930s-1970s.

Sampling

Methods and skills of Bernard van Dooren are described in: Van Dooren J. & J.F.J.Jansen 2018. Eierzoeker in de Brabantse Kempen: Bernardus van Dooren (1908-1988), Limosa 91.1: 38 – 43.

Quality Control

Quality control was obtained including Jan van Dooren -- son of Bernardus van Dooren -- in the team. He accompanied his father often in the field while collecting clutches. Questions that arose during the digitization process of the diaries, such as geographic locations, habitat, and other issues, were checked with him.

Method steps

Analyzing the diaries on the diversity and consistency of quantitative and qualitative information
Structuring the dataset according this information
Entering the data from the diaries, evaluating the intermediate results and adjusting the structure of the dataset where necessary.
After completing entering, checking thoroughly all data per species successively.
Adding information on taxonomy (based on the Dutch Species Register) and geographic information by a) transforming Dutch grid coordinates into WGS84 coordinates and their uncertainty as well by b) georeferencing textual locality descriptions.
Writing a R-script to transform the data from Excel into DarwinCore, producing a occurrence file and measurementOrFact file
Publishing dataset and adding detailed metadata
Publishing original spreadsheet with more details on Zenodo.

Additional info

In the dataset there are several fields that use codes are definitions that might be not immediately clear. For eventDate the reference date ("Referentie-datum") is used. This is the when the maximum number of eggs is found, which in most case will be the date when a clutch was found. Record number is the number used by Bernardus van Dooren for each clutch (these numbers were not fully unique or consistent, there a new occurrenceID has been created) The term "eimaten" (egg measurements) means how many eggs are measured (length * width) (data on eggs are at Zenodo) For the following terms the different enumerations are used (when value = it means no information is available): "legsel_grootte": 0 means present but number unknown
"legsel_voltallig": 0 means present but number unknown, 1 means certain about the clutch size ("legsel_grootte") "aantal_eieren": 0 means present but number unknown "nesthoogte_in_cm": 0 means between 0 and 5 centimeter "verstoord_verlaten": 0 means disturbed after the reference date, 1 means disturbed on the reference date "nest_in_menselijk_materiaal": 1 means breeding in a nest box, 2 means breeding in other anthropogenic material

Taxonomic Coverages

Breeding birds.

Chordata
rank: phylum
Fringillidae
rank: family
Scolopacidae
rank: family
Alcedinidae
rank: family
Aves
rank: class
Apodiformes
rank: order
Charadriiformes
rank: order
Sylviidae
rank: family
Corvidae
rank: family
Prunellidae
rank: family
Accipitridae
rank: family
Hirundinidae
rank: family
Strigidae
rank: family
Muscicapidae
rank: family
Animalia
rank: kingdom
Galliformes
rank: order
Phasianidae
rank: family
Emberizidae
rank: family
Passeriformes
rank: order
Apodidae
rank: family
Turdidae
rank: family
Acrocephalidae
rank: family
Strigiformes
rank: order
Coraciiformes
rank: order
Paridae
rank: family
Accipitriformes
rank: order

Geographic Coverages

Mostly The Netherlands, and in particular De Kempen area in the Province of Noord-Brabant. Also Belgium and in a few cases also other countries in the world.

Bibliographic Citations

Van Dooren J. & J.F.J. Jansen 2018. Eierzoeker in de Brabantse Kempen: Bernardus van Dooren (1908-1988), Limosa 91(1): 38 – 43. -
BernardusVanDooren_DigitalisatieProject_NLBIF2022.006 - 10.5281/zenodo.10888751

Contacts

Frank de Miranda
originator
position: Chair
Avifaunistische Kring Nederland
IJskelderlaan 3
Doorn
NL-3941 HS
Utrecht
NL
Telephone: +31.657.557047
email: frank.demiranda@outlook.com

Jan van Dooren
originator
Aarperstraat 35
Westerhoven
NL-5563 BJ
Noord-Brabant
NL
Telephone: +31.40.2014398

Jeroen Creuwels
originator
position: Data manager
NLBIF
PO Box 9517
Leiden
NL-2300 RA
Zuid-Holland
NL
Telephone: +31717519362
email: nlbif@naturalis.nl
homepage: https://www.nlbif.nl
userId: https://orcid.org/0000-0001-6131-7026

Frank de Miranda
metadata author
position: Chair
Avifaunistische Kring Nederland
IJskelderlaan 3
Doorn
NL-3941 HS
Utrecht
NL
Telephone: +31.657.557047
email: frank.demiranda@outlook.com

Frank de Miranda
administrative point of contact
position: Chair
Avifaunistische Kring Nederland
IJskelderlaan 3
Doorn
NL-3941 HS
Utrecht
NL
Telephone: +31.657.557047
email: frank.demiranda@outlook.com