Integrated Publishing Toolkit(IPT)

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Batumi Raptor Count (BRC) - Autumn migration data

Latest version published by Batumi Raptor Count on Nov 26, 2018 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.

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.

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 (13 KB)
Metadata as an RTF file download in English (14 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, Vansteelant W, Creuwels J (2018): Batumi Raptor Count (BRC) - Autumn migration data. v1.0. Batumi Raptor Count. Dataset/Samplingevent. http://ipt.nlbif.nl/ipt/resource?r=brc-autumn_migration_counts&v=1.0

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 Dijkgraaf 35 6721 NJ Bennekom NL
http://www.batumiraptorcount.org
Folkert de Boer
BRC Foundation Dijkgraaf 35 6721 NJ Bennekom NL
Wouter Vansteelant
BRC Foundation Dijkgraaf 35 6721 NJ Bennekom 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
BRC Foundation Dijkgraaf 35 6721 NJ Bennekom NL
http://www.batumiraptorcount.org

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
Naturalis PO Box 9517 NL-2300 RA Leiden NL 717519600

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, 41.73], North East [41.687, 41.779]

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 17 August 2008 - 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.

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., Cavaill├Ęs, S., Engelen, D., Jansen, J., Verhelst, B., and Vansteelant, W. M.G. (2018) Autumn raptor migration data from Batumi Raptor Count, Republic of Georgia. zookeys. submitted August 2018

Additional Metadata

Purpose Monitoring of raptor populations
Maintenance Description Dataset is annually maintained.
Alternative Identifiers http://ipt.nlbif.nl/ipt/resource?r=brc-autumn_migration_counts