Description
The summer and winter point count routes (“punktrutterna”) are two of several schemes within the Swedish Bird Survey (see below), run by the Department of Biology at Lund University. The point count routes were initiated in 1975 as a standardized method for detecting and reporting changes in the abundance of birds and their distributions in Sweden over time. The point count routes can be surveyed in summer and/or winter.
The surveys are initiated and carried out by volunteer ornithologists who use standardized methods to count birds along routes of their own choice.
More than 3100 point count routes have been surveyed at least once up to and including the winter 2022/2023, and almost 2500 of these have been surveyed during the winter. The dataset presented here is for the winter point count routes.
In this dataset, some information is placed in the table ExtendedMeasurementOrFacts (eMoF), which is part of the Source Archive available to download directly from the dataset’s page here on gbif.org. The Source Archive contains the data exactly as uploaded to gbif (verbatim). Should you choose to download the dataset as GBIF Annotated Archive instead, the data has been interpreted and quality controlled by gbif, but, the data in the eMoF will not be included as the eMoF extension is not yet supported by gbif.
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 39,400 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.
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.
Versions
The table below shows only published versions of the resource that are publicly accessible.
Rights
Researchers should respect the following rights statement:
The publisher and rights holder of this work is Department of Biology, Lund University. 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: 78d97723-3ac0-460f-9d9e-b8e603489883. Department of Biology, Lund University publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Sweden.
Keywords
Samplingevent
Contacts
- Metadata Provider ●
- Originator ●
- Point Of Contact
- Professor
https://orcid.org/0000-0002-5597-6209
- Metadata Provider ●
- Originator ●
- Point Of Contact
- PhD, Researcher
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Geographic Coverage
All data is collected within Sweden.
| Bounding Coordinates | South West [55.336, 10.957], North East [69.06, 24.167] |
|---|
Taxonomic Coverage
All bird species in Sweden occurring naturally in the wild are included in the survey. Species with a security class 4 or higher (according to the Swedish species information centre (Artdatabanken)) are not shown in this dataset. Currently these species are: Lesser white-fronted goose (fjällgås; Anser erythropus) Golden eagle (kungsörn; Aquila chrysaetos) Spotted eagle (större skrikörn; Clanga clanga) White-tailed eagle (havsörn; Haliaeetus albicilla) Pallid harrier (stäpphök; Circus macrourus) Peregrine falcon (pilgrimsfalk; Falco peregrinus) Gyrfalcon (jaktfalk; Falco rusticolus) Barn owl (tornuggla; Tyto alba) Eagle owl (berguv; Bubo bubo) Snowy owl (fjälluggla; Bubo scandiacus) White-backed woodpecker (vitryggig hackspett; Dendrocopos leucotos)
| Kingdom | Animalia (Animals) |
|---|---|
| Phylum | Chordata (Chordates) |
| Class | Aves (Birds) |
Temporal Coverage
| Start Date / End Date | 1975-10-04 / 2023-03-27 |
|---|
Project Data
The Swedish Bird Survey (Svensk Fågeltaxering) is a subprogramme within national environmental monitoring in Sweden. The Swedish Bird Survey is run by the Department of Biology at Lund University. It includes several survey schemes: fixed routes (standardrutter), summer and winter point count routes (sommar- och vinterpunktrutter), night routes (nattrutter), the Swedish waterfowl count (Sjöfågel höst och vinter), and the Swedish coastal bird monitoring programme (Nationella kustfågelövervakningen). The work is carried out in collaboration with, and is supported by, the Swedish Environmental Protection Agency and the County Administrative Boards. The Swedish Bird Survey is the Swedish representative in the European Bird Census Council (EBCC). All the survey schemes mentioned above serve to monitor changes in the Swedish bird populations. Since 1975, experienced and competent ornithologists volunteer to count birds in more than a thousand locations across Sweden, at different times of the year. Since the surveys are carried out in the same way each year, the outcome can be compared between years and hence changes detected.
| Title | Swedish Bird Survey (Svensk Fågeltaxering) |
|---|---|
| Funding | The Swedish Environmental Protection Agency supports the Swedish Bird Survey. Most of the County Administrative Boards fund some of the survey schemes at a regional scale. |
| Study Area Description | Sweden |
| Design Description | See the project website (www.fageltaxering.lu.se, in Swedish) for descriptions of the individual survey schemes. |
The personnel involved in the project:
Sampling Methods
Winter point count routes consist of 20 separate positions (points), situated around 300 m or more apart in dense forest and around 400 m or more apart in open terrain, to minimize the risk of double-counting. Birds are counted while the surveyor is standing still for 5 minutes at each point. All birds seen or heard shall be registered no matter how near or far from the point they are. Only birds identified to species shall be included, except crossbills that may (when necessary) be registered at the genus level. The surveyor’s method of transport between points is also registered (on foot or skis, by bike or moped, by car or motorcycle, other). The amount of snow on the ground is also registered (bare ground, snow covered ground, very thin or patchy cover of snow).
| Study Extent | Geography: The winter point count routes are distributed across the whole of Sweden, and there are routes present in all of the 21 Swedish counties. However, the routes are concentrated to the more populated southern half of the country. Point count routes are personal and the position of the route (and the 20 individual points) is determined by the surveyor who initiates it (a so called “free choice” monitoring scheme). Timing and frequency: The winter season is divided into five survey periods, each lasting for 21 days including three weekends. 1: 5–25 October 2: 10–30 November 3: 19 December – 8 January (the main survey period) 4: 24 January – 13 February 5: 1–21 March The project leaders recommend the surveyor to choose one of three survey plans depending on the amount of time and effort he or she is able to spend (but all survey data are accepted regardless of when within the five periods they are collected): Plan 1: The winter point count route is surveyed just once, and then during period no. 3. Plan 2: The route is surveyed twice, and then during periods no. 3 and 5. Plan 3: The route is surveyed during all five periods. Surveying during all five periods allows the tracking of invasions and other movement patterns. It can potentially also allow calculations of winter mortality. Surveying during period no.5 can also be regarded as an early spring survey of breeding non-migrants as well as provide information about changes in the arrival of early migrants. Surveys should preferably be undertaken +/- 5 days of when it was done in year 1. Surveying should start at the same time in relation to sunrise as on the first occasion it was surveyed, +/- a maximum of 30 minutes, and it is recommended to start early morning. The 20 points should be surveyed in the same order every year. A route does not have to be surveyed every year. Since the routes are (in the vast majority of cases) personal, they are no longer counted once the surveyor stops counting this particular route. Following the same principle, new routes can be initiated. |
|---|---|
| Quality Control | Data is checked and validated by the project leaders, specifically species identity, numbers and geographical location. Confidence in the data is good. |
Method step description:
- See sampling description.
Additional Metadata
Important information for potential users of the Winter point count route data: 1. The data shown in this Darwin core archive are, for each bird species, the sum total of all individuals on all the 20 points during this visit. 2. Null visits and zero observations: Users of the data have to construct zero data for each species themselves. The occurrence table contains observations of species that were actually present at the surveyed sites, but the surveyor would have looked for all species that are included in the survey design. For visits to sites where no observations were made at all (when such null visits exist), the occurrence table also includes one zero observation with vernacularName set to "SpeciesIncludedInSurvey", and occurrenceStatus set to "Absent". This is to ensure that information about surveyor is included in the DwC-A also for these events. Additionally, information about whether a visit is a nullvisit (i.e. true = no survey species observed) or not (i.e. false = one or more survey species were observed) is included in the ”extended measurement or fact table”. 3. The coordinates supplied are for the central point of a 25 x 25 km survey grid square, within which most of the points of the route are located. 4. The design of the survey program relies on each surveyor choosing his or her own route to count birds on. This means there is some overlap between some routes, both geographically and timewise. For the majority of routes, especially older ones, the only geographic information available about the route’s location are the midpoint coordinates of the 25 x 25 km square within which most of the points are located (supplied in the dataset). For this reason, it is impossible to know the exact amount of overlap. The exact position are known from a few very old routes, but not until the early 2000s were the positions of all 20 points asked for (also retrospectively). Since around 2005, coordinates for each of the 20 points are requested from the surveyor for all new routes. These are at present not supplied in the dataset, but are available upon request from the data provider. The original design also relies on data from a particular route being entirely comparable between years, i.e. all data collected on a route is collected by the same person. Hence, in the few cases where a route has been taken over by a new surveyor, the route has been given a new id. 5. Habitat data: As part of the original survey program design in 1975, surveyor were asked to register the amount of different habitats at each of the twenty points on the route. This information was regularly updated for some routes but not for others. Since around 2015 requesting this information stopped and instead coordinates for each of the twenty points were requested. This enables a potential user of the data to extract habitat data from a source of their own choice. But point coordinates are not available for all routes (see above), and never will be for those where the surveyor did not, or can no longer, supply the information. The habitat data is available upon request from the data provider.
| Purpose | National environmental monitoring of birds. |
|---|---|
| Maintenance Description | New data are added to the dataset yearly when the survey of that year is completed and data has been quality checked. In between these yearly updates the data is corrected as required. |
| Alternative Identifiers | 78d97723-3ac0-460f-9d9e-b8e603489883 |
| https://www.gbif.se/ipt/resource?r=lu_sft_vpkt |