Integrated Publishing Toolkit(IPT)

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Batumi Raptor Count (BRC) - Autumn migration data

Latest version published by Batumi Raptor Count on Apr 10, 2019 Batumi Raptor Count

One of the most important geographical bottlenecks for migrating raptors in the east African-Palearctic migration system is situated between the easternmost tip of the Black Sea and the Lesser Caucasus, just north of Batumi, in the Republic of Georgia (Verhelst et al. 2011).

Since 2008 citizen scientists of the Batumi Raptor Count(BRC) monitor the autumn raptor passage daily from mid August till mid October, collecting also detailed information about the age and sex of focal species. These data are included in the BRC dataset. This dataset offers a unique baseline for monitoring the state of migrant raptor populations in the east African-Palearctic flyway in the 21st century.

Each season a large number of raptors are counted during the autumn migration count. The numbers fluctuate around the million individuals in each season. This dataset represent the data during the 2008-2017 seasons. A detailed description of the BRC migration count protocol, data management strategy, and the open access BRC dataset in GBIF are provided by Wehrmann et al. (2019). This dataset has been used to analyse changes in the abundance and demography of eight abundant raptor species at BRC between 2011-2017. The resulting research paper is currently in 2nd review and will be shared through this webpage immediately upon publication.

Data Records

The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 611 records. 2 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.

  • Event (core)
    611
  • Occurrence 
    372352
  • ExtendedMeasurementOrFact 
    1333

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.

Downloads

Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 611 records in English (10 MB) - Update frequency: annually
Metadata as an EML file download in English (16 KB)
Metadata as an RTF file download in English (16 KB)

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Wehrmann J, de Boer F, Benjumea R, Cavaillès S, Engelen D, Jansen J, Verhelst B, Creuwels JCS, Vansteelant WMG (2018): Batumi Raptor Count (BRC) - Autumn migration data. v1.2. Batumi Raptor Count. Dataset/Samplingevent. http://ipt.nlbif.nl/ipt/resource?r=brc-autumn_migration_counts&v=1.2

Rights

Researchers should respect the following rights statement:

The publisher and rights holder of this work is Batumi Raptor Count. 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

This resource has been registered with GBIF, and assigned the following GBIF UUID: d19c0287-15ee-45fd-b810-d30e8026a785.  Batumi Raptor Count publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Netherlands Biodiversity Information Facility.

Keywords

Occurrence; Autumn migration; raptor; African-Palearctic flyway; monitoring

Contacts

Who created the resource:

Jasper Wehrmann
BRC Foundation Hannah Arendtweg 84 1349CM Almere NL
http://www.batumiraptorcount.org
Folkert de Boer
BRC Foundation Hannah Arendtweg 84 1349CM Almere NL
Wouter Vansteelant
BRC Foundation Hannah Arendtweg 84 1349CM Almere NL
Jeroen Creuwels
Data manager NLBIF
Naturalis PO Box 9517 NL-2300 RA Leiden NL +31 71 7519600
http://www.nlbif.nl

Who can answer questions about the resource:

Jasper Wehrmann
Folkert de Boer
BRC Foundation Hannah Arendtweg 84 1349CM Almere NL

Who filled in the metadata:

BRC Foundation
BRC Foundation Dijkgraaf 35 6721 NJ Bennekom NL
http://www.batumiraptorcount.org

Who else was associated with the resource:

Processor
Niels Raes
Node manager NLBIF
Naturalis PO Box 9517 NL-2300 RA Leiden NL +31 71 7519600
Frank de Miranda
Voorzitter
Stichting DuGof IJskelderlaan 3 3941 HS DOORN NL
http://dugof.nl/

Geographic Coverage

The bottleneck is situated at the narrowest point between the eastern coast of the Black Sea and the foothills of the Lesser Caucasus, just to the north of the city of Batumi, in the Republic of Georgia.

Bounding Coordinates South West [41.684, 41.699], North East [41.688, 41.802]

Taxonomic Coverage

Soaring birds and few others such as Roller

Order  Accipitriformes (Raptors)
Species  Coracias garrulus (European Roller),  Streptopelia turtur (European turtle dove),  Ciconia ciconia (White Stork),  Ciconia nigra (Black Stork)

Temporal Coverage

Formation Period mid Aug to mid Oct annually from 2008 till present.

Project Data

Since 2008 citizen scientists of the Batumi Raptor Count(BRC) monitor the autumn raptor passage daily from mid August till mid October, collecting also detailed information about the age and sex of focal species. Counts are focused on high-quality data for monitoring of target species, and for which species we can provide high-quality data useful for trend analyses.

Title Batumi Raptor Counts - Autumn migration data
Funding NLBIF partly funded publication and processing of the BRC dataset to GBIF
Study Area Description The two count stations are located on hilltops with unobstructed view facing north into the landscape, and within visible range from each other. Locations are the villages Sakhalvasho and Shuamta, North of Batumi, in the Republic of Georgia, between the easternmost tip of the Black Sea and the Lesser Caucasus.
Design Description Migration counts are performed simultaneously from two count stations to cover the approximately 12km long transect line.

The personnel involved in the project:

Point Of Contact
Jasper Wehrman

Sampling Methods

Daily counts from 17st August till 16st October. The daily count period starts at one hour after sunrise and ends two hours before sunset. Counts consisted of continuous monitoring during the count period and recording all occurrences.

Study Extent The villages Sakhalvasho and Shuamta, North of Batumi, in the Republic of Georgia.
Quality Control Counts are conducted by experienced and less experienced bird-watchers that volunteer to count at least two weeks. Count-coordinators screen, select and schedule volunteers such that each station can be staffed by a team consisting of one coordinator and 6 to 12 counters, depending on migration intensity, diversity and also counter availability. We try to enter records always immediately to enable the double count detection in later phase. Digital photography has become an important tool to aid identification of easily confused species.

Method step description:

  1. At the end of each day count-coordinators go through the records to check for major errors (using simple criteria such as large flocks of rare birds, or specific age and sex combinations), and where possible correct them by discussing these observations with their daily count team. Observations that are suspect due to insufficient information (for example, a large eagle cannot be identified without being aged) are degraded to a less specific level (large eagle spec.).
  2. At the end of each season the data is verified with an automated script in the open source R software (R Core Team 2017) that validates each single record, ensures count protocol integrity and changes the identification of the species-level of those records with insufficient information.
  3. An important final step in the production of the NLBIF data product is to detect all double counts in the overlapping count zones between the two stations. An automated procedure written in R detects potential double counts in different spatial and temporal windows for different species.

Bibliographic Citations

  1. Wehrmann J, de Boer F, Benjumea R, Cavaillès S, Engelen D, Jansen J, Verhelst B, Vansteelant WMG (2019) Batumi Raptor Count: autumn raptor migration count data from the Batumi bottleneck, Republic of Georgia. ZooKeys 836: 135-157. https://doi.org/10.3897/zookeys.836.29252
  2. Verhelst B, Jansen J, Vansteelant WMG (2011) South West Georgia: an important bottleneck for raptor migration during autumn. Ardea 99: 137–146. https://doi.org/10.5253/078.099.0203

Additional Metadata

Information about killed and injured birds during the Autumn raptor monitoring is given in the extension ExtendedMeasurementOrFact. Due to a technical error (which is under review at GBIF) this extension does not automatically link data in this extension with the occurrence dataset. Therefore these data will not be shown at the GBIF portal. However, these data can be retrieved from DwCA in the file "extendedmeasurementorfact.txt".

Purpose Monitoring the abundance, demography and timing of migrant raptors and selected threatened species in the East African-Palearctic flyway. In addition the data collected may be useful for studying the influence of weather on diel and seasonal migration dynamics of soaring birds.
Maintenance Description Dataset is annually maintained.
Alternative Identifiers d19c0287-15ee-45fd-b810-d30e8026a785
http://ipt.nlbif.nl/ipt/resource?r=brc-autumn_migration_counts