Long-term trends in abundance, phenology, and morphometrics of Little Stint Calidris minuta during autumn migration in southern Sweden, 1946-2020.
| Title: | Long-term trends in abundance, phenology, and morphometrics of Little Stint Calidris minuta during autumn migration in southern Sweden, 1946-2020. |
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| Alternate Title: | Långsiktiga trender i förekomst, fenologi och morfometri för småsnäppor Calidris minuta på höstflyttning vid Ottenby 1946-2020. |
| Authors: | Waldenström, Jonas1,2 jonas.waldenstrom@lnu.se, van Toor, Mariëlle1 marielle.vantoor@lnu.se, Lindström, Åke3 ake.lindstrom@biol.lu.se |
| Source: | Ornis Svecica. 2023, Vol. 33 Issue 1, p30-48. 19p. |
| Subject Terms: | *LITTLE stint, *PHENOLOGY, *MORPHOMETRICS, *BIRD migration, *BIRD reproduction |
| 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; 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. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: Long-term trends in abundance, phenology, and morphometrics of Little Stint Calidris minuta during autumn migration in southern Sweden, 1946-2020. – Name: TitleAlt Label: Alternate Title Group: TiAlt Data: Långsiktiga trender i förekomst, fenologi och morfometri för småsnäppor Calidris minuta på höstflyttning vid Ottenby 1946-2020. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Waldenström%2C+Jonas%22">Waldenström, Jonas</searchLink><relatesTo>1,2</relatesTo><i> jonas.waldenstrom@lnu.se</i><br /><searchLink fieldCode="AR" term="%22van+Toor%2C+Mariëlle%22">van Toor, Mariëlle</searchLink><relatesTo>1</relatesTo><i> marielle.vantoor@lnu.se</i><br /><searchLink fieldCode="AR" term="%22Lindström%2C+Åke%22">Lindström, Åke</searchLink><relatesTo>3</relatesTo><i> ake.lindstrom@biol.lu.se</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Ornis+Svecica%22">Ornis Svecica</searchLink>. 2023, Vol. 33 Issue 1, p30-48. 19p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22LITTLE+stint%22">LITTLE stint</searchLink><br />*<searchLink fieldCode="DE" term="%22PHENOLOGY%22">PHENOLOGY</searchLink><br />*<searchLink fieldCode="DE" term="%22MORPHOMETRICS%22">MORPHOMETRICS</searchLink><br />*<searchLink fieldCode="DE" term="%22BIRD+migration%22">BIRD migration</searchLink><br />*<searchLink fieldCode="DE" term="%22BIRD+reproduction%22">BIRD reproduction</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: 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. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Ornis Svecica is the property of Birdlife Sverige and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.34080/OS.V33.23489 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 19 StartPage: 30 Subjects: – SubjectFull: LITTLE stint Type: general – SubjectFull: PHENOLOGY Type: general – SubjectFull: MORPHOMETRICS Type: general – SubjectFull: BIRD migration Type: general – SubjectFull: BIRD reproduction Type: general Titles: – TitleFull: Long-term trends in abundance, phenology, and morphometrics of Little Stint Calidris minuta during autumn migration in southern Sweden, 1946-2020. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Waldenström, Jonas – PersonEntity: Name: NameFull: van Toor, Mariëlle – PersonEntity: Name: NameFull: Lindström, Åke IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: 2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 11026812 Numbering: – Type: volume Value: 33 – Type: issue Value: 1 Titles: – TitleFull: Ornis Svecica Type: main |
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