Realm: Terrestrial
Climate: Polar/Temperate
Biome: Multiple
Central latitude: 62.417468
Central longitude: 17.222083
Duration: 24 years, from 1996 to 2019

359466 records

254 distinct species

Across the time series Phylloscopus trochilus is the most frequently occurring species

Methods

Geography and habitat: In total there are 716 Fixed routes systematically distributed across Sweden in a 25 by 25 km grid. This means that all main habitats are surveyed in a representative manner. Timing and frequency: The survey should be carried out in the main breeding season for the majority of species. Hence the date for the survey will vary across the country (approximately 20 May-5 July). Start time should be 04:00 (+/-30 min), but no earlier than 30 minutes before sunrise. Each route should ideally be surveyed once per year, but each year there are routes that were not surveyed. These are prioritised the following year. General layout: A fixed route consists of eight 1km-line transects and eight 5minute-points, along a 2 by 2 km square. Line transects and points should be considered as two separate surveys. (NOTE: some routes consist of less than eight lines and/or points. This is the case when lines/points end up e.g. in a lake or the sea due routes being distributed in a standardised grid. However, a particular route has the same number of lines and points each year it is surveyed.) A given animal can occur on one point and one line, but double-counting the same animal on two points or two lines should be avoided. All birds (excluding young of the year) and mammals (including young of the year, but see the species list) seen or heard are registered no matter how near or far from the line or point they are. Line transects: Counting is carried out while slowly walking, stopping to listen and watch as necessary, during approximately 30-40 minutes per km depending on the terrain. Point counts: Birds are counted while standing still for 5 minutes at each point. The data shown in this Darwin core archive are, for each bird or mammal species, the sum of all individuals on all the line transects during this visit. The coordinates supplied are for the central point of each 25 x 25 km square of the survey grid, within which the route is situated. Breeding vs migrating birds: The survey person is expected to report all birds seen or heard. This survey is carried out at the time of year when most birds have just started breeding. One can therefore assume that the very majority of birds that are registered are actually breeding, or attempting to breed, in the location where they were registered. There are however some notable exceptions. Some of the species registered do not breed in Sweden, and are instead migrating individuals; for example Brent Goose (prutgås), Greater White-fronted Goose (bläsgås) and Grey Plover (kustpipare). For some species breeding in the far north of Sweden, individuals are seen further south as they are on their way to or from the breeding grounds. Examples of such species are Bar-tailed Godwit (myrspov), Spotted Redshank (svartsnäppa) and Wood Sandpiper (grönbena). There are also reports of uncommon species that are yet to be confirmed as breeding in Sweden, but where its possible that the individual registered was actually breeding at the location. Regardless of which of the described situations applies, all data is included in the dataset, and it is the users responsibility to decide how to use the data. Adults vs young of the year: Some birds start breeding early enough for the young to have left the nest at the time of the survey. These young of the year are not normally included in the numbers reported, but for some species it cannot be ruled out that some are indeed included. For the three Loxia species, breeding already in late winter, young of the year definitely constitute a large part of the birds registered. Species with a security class 4 or higher (according to the Swedish species information centre (Artdatabanken)) are not shown in this dataset.

Citation(s)

@Dataset{BioTIME_cit384, Study_id = {634}, Citation_id = {384}, Author = {Lindstr{\"o}m, {\r A}ke and Green, Martin}, Publisher = {Department of Biology, Lund University}, Title = {Swedish Bird Survey: Fixed routes (Standardrutterna)}, Year = {2020}, Doi = {10.15468/hd6w0r}, Url = {https://doi.org/10.15468/hd6w0r}, Language = {English} }