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Övervakning av fåglarnas populationsutveckling. Årsrapport för 2020.

Green, Martin LU ; Haas, Fredrik LU ; Lindström, Åke LU orcid and Nilsson, Leif LU (2021)
Abstract
We present the results of the Swedish Bird Survey, run by the Department of Biology, Lund University, as a part of the National Monitoring Programme of the Swedish Environmental Protection Agency. The results for 2020 include data from: 564 winter point counts in 2019/2020 (45th winter), of which 274 were carried out during the Christmas/New Year count, 210 summer point count routes (46th year) and 550 Fixed routes (25th year). In the programme for covering night-active birds (11th season), 151 routes were covered on up to three occasions each (March, April and June). In addition, 372 waterbird routes (6th season) and 200 archipelago squares (6th season) were surveyed. New for this year is that we also
include the International... (More)
We present the results of the Swedish Bird Survey, run by the Department of Biology, Lund University, as a part of the National Monitoring Programme of the Swedish Environmental Protection Agency. The results for 2020 include data from: 564 winter point counts in 2019/2020 (45th winter), of which 274 were carried out during the Christmas/New Year count, 210 summer point count routes (46th year) and 550 Fixed routes (25th year). In the programme for covering night-active birds (11th season), 151 routes were covered on up to three occasions each (March, April and June). In addition, 372 waterbird routes (6th season) and 200 archipelago squares (6th season) were surveyed. New for this year is that we also
include the International Waterbird Census (IWC) from September (47th year, 145 sectors) and January (55th year, 1066 sectors), and nationwide goose counts in September, October, November and January (44th season, 1537 sites). In total 759 persons were involved in the surveys reported here. Population trends were analyzed using TRIM and trends for 228 different bird species are presented, as well as the geographical distributions of the covered routes. Larger mammals are counted on the Night routes and the Fixed routes since 2010 and 2011, respectively, and we present short-term trends for 12 mammal species based on these two systems. We also present trends from the new schemes of water- and archipelago birds, through which we can now follow yet more species with
systematic counts during the breeding period. The long-term trends show both winners and losers among the Swedish birds. In general breeding bird numbers have decreased since the 1970s. Among the winners are swans and geese,
raptors and cranes. Most species of autumn staging and wintering waterbirds have increased in numbers during the same period. When it comes to the wintering birds, the increases are most likely a result of generally milder winters with more open water and snow-free ground. Year 2020 was in general a good bird year in Sweden and based on 204 taxa recorded on the Fixed routes over the last 10 years, there are more species significantly increasing in numbers (26%), than decreasing in numbers (15%). For the remaining species (59%), no statistically significant changes were recorded during the last ten years. Based on the winter point counts, the trends during the last ten winters are strongly positive. In
total 35 % of 114 species have increased significantly, while only 8 % have decreased. For waterbirds specifically, the majority of the surveyed species (67%) have increased in winter during the last ten years and only one species (3%) decreased significantly. The increasing numbers of wintering waterbirds is also in the short perspective a result of mild winters. With the additions of our latest survey programs we can now follow the population development of somewhere between 80 and 90% of the about 250 bird species breeding in Sweden. (Less)
Abstract (Swedish)
I denna rapport redovisas populationstrender för 228 svenska fågelarter för olika långa tidsperioder. Vi visar också korttidstrender för 12 arter av större däggdjur. Fåglarna har räknats höst, vinter, vår och sommar enligt strikt standardiserade metoder. Sommar- respektive vinterpunktrutter har räknats sedan 1975, i huvudsak i södra Sverige. Standardrutterna räknas också på sommaren (sedan
1996) men täcker hela Sverige på ett representativt sätt. Nattaktiva fåglar har räknats sedan 2010. Utöver detta räknas större däggdjur både på standardrutterna (sedan 2011) och på nattrutterna. Under 2019 påbörjades även räkning av groddjur på nattrutterna. Sedan 2015 räknas fåglar i ytterligare två program under häckningstid; Sjöfågelrutterna... (More)
I denna rapport redovisas populationstrender för 228 svenska fågelarter för olika långa tidsperioder. Vi visar också korttidstrender för 12 arter av större däggdjur. Fåglarna har räknats höst, vinter, vår och sommar enligt strikt standardiserade metoder. Sommar- respektive vinterpunktrutter har räknats sedan 1975, i huvudsak i södra Sverige. Standardrutterna räknas också på sommaren (sedan
1996) men täcker hela Sverige på ett representativt sätt. Nattaktiva fåglar har räknats sedan 2010. Utöver detta räknas större däggdjur både på standardrutterna (sedan 2011) och på nattrutterna. Under 2019 påbörjades även räkning av groddjur på nattrutterna. Sedan 2015 räknas fåglar i ytterligare två program under häckningstid; Sjöfågelrutterna (drivs tillsammans med BirdLife
Sverige) som riktar in sig på fåglar knutna till blöta miljöer både i inlandet och längs kusten, samt Kustfågelövervakningen där sjöfåglar i skärgården räknas inom 200 fasta rutor om 2 x 2 km. I denna rapport presenterar vi också resultaten från simfågelräkningar i september (sedan 1973) och januari (sedan 1971) samt gåsinventeringar under hösten och januari (sedan 1976). De senast nämnda inventeringarna ingår i de internationella sjöfågelräkningarna och presenterades tidigare i en egen rapport. Från och med nu samlar vi alla dessa delprogram i en enda rapport. Vintern 2019/2020 inventerades 564 vinterpunktrutter varav 274 gjordes under huvudperioden kring jul och nyår. Sommaren 2020 gjordes 210 sommarpunktrutter och hela 550 standardrutter. Totalt 151 nattrutter inventerades vid upp till tre tillfällen (mars, april och juni) under 2020. Det inventerades 372 sjöfågelrutter och 200 kustrutor under försommaren 2020.
Sjöfåglar räknades i 145 sektorer i september 2019 och i 1066 sektorer i januari 2020. Gäss räknas under månaderna september, oktober, november (2019) och januari (2020) på mer än 1500 lokaler. Totalt medverkade 759 inventerare i de olika delprogrammen från hösten 2019 till sommaren 2020. Långtidstrenderna visar att det både finns vinnare och förlorare i den svenska fågelfaunan, men generellt har antalet häckande fåglar i Sverige minskat sedan mitten av 1970-talet. Bland de som ökat i antal återfinns svanar, gäss, rovfåglar och tranor. De i Sverige rastande och övervintrande vattenfåglarna har i allmänhet ökat i antal under samma tidsperiod. Den sistnämnda ökningen beror allra mest på generellt mildare vintrar med mer öppet vatten runt Sveriges kuster samt att marken allt oftare är snöfri.År 2020 var ett bra fågelår i Sverige och sett till de senaste tio åren är det fler arter (26%) som ökat än som minskat (15%) i antal under häckningstid enligt standardrutterna (baserat på 204 arter och underarter). För resterande 59% av arterna finns inga säkra förändringar under denna korta tidsperiod. Mönstret är än mer positivt för övervintrande fåglar under de senaste tio åren. Vintertid har 35% av arterna som vi kan beräkna en trend för på vinterpunktrutterna ökat i antal, medan enbart 8% har minskat i antal under samma period. Specifikt för vattenfåglar är bilden ännu mer positiv. Bland dessa har majoriteten av de 30 analyserade arterna (67%) ökat under de senaste tio åren och blott 3 % (en art) har minskat i antal. De ökande antalen övervintrande vattenfåglar beror även under denna korta period på en räcka av milda vintrar. Med de senaste tilläggen i form av nattrutter, sjöfågelrutter och kustfågelrutor kan vi nu följa populationsutvecklingen för mellan 80 och 90% av de i Sverige ca 250 häckande fågelarterna. (Less)
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author
; ; and
organization
alternative title
Monitoring population changes of birds in Sweden. Annual report for 2020.
publishing date
type
Book/Report
publication status
published
subject
pages
94 pages
publisher
Biologiska institutionen, Lunds universitet
project
Swedish bird monitoring
language
Swedish
LU publication?
yes
id
8a66ef65-8407-4060-85db-247fc41e66bd
date added to LUP
2021-10-19 14:25:38
date last changed
2023-09-01 10:18:22
@techreport{8a66ef65-8407-4060-85db-247fc41e66bd,
  abstract     = {{We present the results of the Swedish Bird Survey, run by the Department of Biology, Lund University, as a part of the National Monitoring Programme of the Swedish Environmental Protection Agency. The results for 2020 include data from: 564 winter point counts in 2019/2020 (45th winter), of which 274 were carried out during the Christmas/New Year count, 210 summer point count routes (46th year) and 550 Fixed routes (25th year). In the programme for covering night-active birds (11th season), 151 routes were covered on up to three occasions each (March, April and June). In addition, 372 waterbird routes (6th season) and 200 archipelago squares (6th season) were surveyed. New for this year is that we also<br/>include the International Waterbird Census (IWC) from September (47th year, 145 sectors) and January (55th year, 1066 sectors), and nationwide goose counts in September, October, November and January (44th season, 1537 sites). In total 759 persons were involved in the surveys reported here. Population trends were analyzed using TRIM and trends for 228 different bird species are presented, as well as the geographical distributions of the covered routes. Larger mammals are counted on the Night routes and the Fixed routes since 2010 and 2011, respectively, and we present short-term trends for 12 mammal species based on these two systems. We also present trends from the new schemes of water- and archipelago birds, through which we can now follow yet more species with<br/>systematic counts during the breeding period. The long-term trends show both winners and losers among the Swedish birds. In general breeding bird numbers have decreased since the 1970s. Among the winners are swans and geese,<br/>raptors and cranes. Most species of autumn staging and wintering waterbirds have increased in numbers during the same period. When it comes to the wintering birds, the increases are most likely a result of generally milder winters with more open water and snow-free ground. Year 2020 was in general a good bird year in Sweden and based on 204 taxa recorded on the Fixed routes over the last 10 years, there are more species significantly increasing in numbers (26%), than decreasing in numbers (15%). For the remaining species (59%), no statistically significant changes were recorded during the last ten years. Based on the winter point counts, the trends during the last ten winters are strongly positive. In<br/>total 35 % of 114 species have increased significantly, while only 8 % have decreased. For waterbirds specifically, the majority of the surveyed species (67%) have increased in winter during the last ten years and only one species (3%) decreased significantly. The increasing numbers of wintering waterbirds is also in the short perspective a result of mild winters. With the additions of our latest survey programs we can now follow the population development of somewhere between 80 and 90% of the about 250 bird species breeding in Sweden.}},
  author       = {{Green, Martin and Haas, Fredrik and Lindström, Åke and Nilsson, Leif}},
  institution  = {{Biologiska institutionen, Lunds universitet}},
  language     = {{swe}},
  title        = {{Övervakning av fåglarnas populationsutveckling. Årsrapport för 2020.}},
  year         = {{2021}},
}