Långsiktiga trender i förekomst, fenologi och morfometri för småsnäppor Calidris minuta på höstflyttning vid Ottenby 1946–2020
Waldenström, Jonas LU ; van Toor, Mariëlle and Lindström, Åke LU
(2023)
In Ornis Svecica
33.
p.30-48
- Abstract
THE LITTLE STINT Calidris minuta is an Arctic wader species that migrates through the Baltic Sea region towards wintering areas in North and West Africa and the Mediterranean region. We use a 75-year trapping series, comprising 4,791 Little Stints on autumn migration, from Ottenby Bird Observatory in Sweden to illustrate long-term trends in abundance, phenology, and morphometrics. Numbers of trapped juveniles dropped from median 31 (mean 74) in 1946–1999 to median 1.5 (mean 3.5) birds in 2000–2020, while the number of adults was generally low and without trends. Rolling window analyses showed that the drop in juveniles started around 1984, and from 1993 onward the median never exceeded seven juveniles/year (25%-quantile: 0–1;... (More)
THE LITTLE STINT Calidris minuta is an Arctic wader species that migrates through the Baltic Sea region towards wintering areas in North and West Africa and the Mediterranean region. We use a 75-year trapping series, comprising 4,791 Little Stints on autumn migration, from Ottenby Bird Observatory in Sweden to illustrate long-term trends in abundance, phenology, and morphometrics. Numbers of trapped juveniles dropped from median 31 (mean 74) in 1946–1999 to median 1.5 (mean 3.5) birds in 2000–2020, while the number of adults was generally low and without trends. Rolling window analyses showed that the drop in juveniles started around 1984, and from 1993 onward the median never exceeded seven juveniles/year (25%-quantile: 0–1; 75%-quantile: 4–55). Moreover, adult birds advanced their passage on average 0.48 days per year, passing 26 days earlier in 2020 than in 1946. Earlier migration of adults and decreased numbers of juveniles suggest low reproductive output in recent decades. Morphometric data of recaptured birds show that Little Stints on stopover at Ottenby gain fuel at a speed close to the theoretical maximum, strongly indicating that the conditions at the trapping site remain favourable for foraging waders.
(Less)
- author
- Waldenström, Jonas
LU
; van Toor, Mariëlle
and Lindström, Åke
LU
- organization
- alternative title
- Long-term trends in abundance, phenology, and morphometrics of Little Stint Calidris minuta during autumn migration in southern Sweden, 1946–2020
- publishing date
- 2023-03
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Arctic shorebirds, Charadriiformes, climate change, fat deposition, population decline, stopover ecology
- in
- Ornis Svecica
- volume
- 33
- pages
- 19 pages
- publisher
- Sveriges Ornitologiska Förening
- external identifiers
-
- scopus:85162000539
- ISSN
- 1102-6812
- DOI
- 10.34080/os.v33.23489
- language
- Swedish
- LU publication?
- yes
- id
- 45547c2f-9fba-45c7-ac7a-6138808228d7
- date added to LUP
- 2023-09-20 14:12:30
- date last changed
- 2023-09-20 14:12:30
@article{45547c2f-9fba-45c7-ac7a-6138808228d7,
abstract = {{<p>THE LITTLE STINT Calidris minuta is an Arctic wader species that migrates through the Baltic Sea region towards wintering areas in North and West Africa and the Mediterranean region. We use a 75-year trapping series, comprising 4,791 Little Stints on autumn migration, from Ottenby Bird Observatory in Sweden to illustrate long-term trends in abundance, phenology, and morphometrics. Numbers of trapped juveniles dropped from median 31 (mean 74) in 1946–1999 to median 1.5 (mean 3.5) birds in 2000–2020, while the number of adults was generally low and without trends. Rolling window analyses showed that the drop in juveniles started around 1984, and from 1993 onward the median never exceeded seven juveniles/year (25%-quantile: 0–1; 75%-quantile: 4–55). Moreover, adult birds advanced their passage on average 0.48 days per year, passing 26 days earlier in 2020 than in 1946. Earlier migration of adults and decreased numbers of juveniles suggest low reproductive output in recent decades. Morphometric data of recaptured birds show that Little Stints on stopover at Ottenby gain fuel at a speed close to the theoretical maximum, strongly indicating that the conditions at the trapping site remain favourable for foraging waders.</p>}},
author = {{Waldenström, Jonas and van Toor, Mariëlle and Lindström, Åke}},
issn = {{1102-6812}},
keywords = {{Arctic shorebirds; Charadriiformes; climate change; fat deposition; population decline; stopover ecology}},
language = {{swe}},
pages = {{30--48}},
publisher = {{Sveriges Ornitologiska Förening}},
series = {{Ornis Svecica}},
title = {{Långsiktiga trender i förekomst, fenologi och morfometri för småsnäppor Calidris minuta på höstflyttning vid Ottenby 1946–2020}},
url = {{http://dx.doi.org/10.34080/os.v33.23489}},
doi = {{10.34080/os.v33.23489}},
volume = {{33}},
year = {{2023}},
}