Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory Origins
The global decline in many species of migratory birds has focused attention on the extent of migratory connectivity between breeding and wintering populations. Stable-hydrogen isotope (δD) analysis of feathers is a useful technique for measuring connectivity, but is constrained by features of molt...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Resilience Alliance
2008-06-01
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| Series: | Avian Conservation and Ecology |
| Subjects: | |
| Online Access: | http://www.ace-eco.org/vol3/iss1/art2/ |
| _version_ | 1797970995820101632 |
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| author | Kevin C. Fraser T. Kurt. Kyser Raleigh J. Robertson Laurene M. Ratcliffe |
| author_facet | Kevin C. Fraser T. Kurt. Kyser Raleigh J. Robertson Laurene M. Ratcliffe |
| author_sort | Kevin C. Fraser |
| collection | DOAJ |
| description | The global decline in many species of migratory birds has focused attention on the extent of migratory connectivity between breeding and wintering populations. Stable-hydrogen isotope (δD) analysis of feathers is a useful technique for measuring connectivity, but is constrained by features of molt location and timing. Claws are metabolically inert, keratinous tissues that grow continuously and can be sampled at any point in the annual cycle, thus providing potentially useful clues about an individual's previous movements. However, variation in the rate at which claws incorporate local δD values is not well described. We measured δD values in claws of two species of Neotropical-Nearctic migrant wood-warblers (Golden-winged Warbler and Cerulean Warbler) breeding in eastern Ontario, Canada to investigate the rate of δD change through the breeding season and the utility of claw δD values for estimating migratory origins. δD values of claw tips from 66 different individuals, each sampled once during the breeding season, showed an average change of -0.3 to -0.4 per day in the direction of the expected local Ontario value. There were no significant sex or species differences in the rate of change. These results suggest δD values of claw tips in Parulids may reflect those of the non-breeding area for 3-7 weeks after arrival on the breeding grounds, and are useful estimators of non-breeding migratory origin. Our results also suggest that these species may leave the breeding ground before claw tips fully incorporate a local δD signature, as claws sampled at the end of the breeding season did not match locally grown feather and claw δD values. This is the first study to examine the seasonal rate of the change in δD values of claws in long-distance, insectivorous, migratory birds. |
| first_indexed | 2024-04-11T03:25:43Z |
| format | Article |
| id | doaj.art-533ad03aa8714bfb9e5332b82f9fc5fe |
| institution | Directory Open Access Journal |
| issn | 1712-6568 |
| language | English |
| last_indexed | 2024-04-11T03:25:43Z |
| publishDate | 2008-06-01 |
| publisher | Resilience Alliance |
| record_format | Article |
| series | Avian Conservation and Ecology |
| spelling | doaj.art-533ad03aa8714bfb9e5332b82f9fc5fe2023-01-02T07:31:25ZengResilience AllianceAvian Conservation and Ecology1712-65682008-06-0131210.5751/ACE-00218-030102218Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory OriginsKevin C. Fraser0T. Kurt. Kyser1Raleigh J. Robertson2Laurene M. Ratcliffe3Department of Biology, Queen's UniversityDept of Geological Sciences and Engineering, Queen's UniversityDepartment of Biology, Queen's UniversityDepartment of Biology, Queen's UniversityThe global decline in many species of migratory birds has focused attention on the extent of migratory connectivity between breeding and wintering populations. Stable-hydrogen isotope (δD) analysis of feathers is a useful technique for measuring connectivity, but is constrained by features of molt location and timing. Claws are metabolically inert, keratinous tissues that grow continuously and can be sampled at any point in the annual cycle, thus providing potentially useful clues about an individual's previous movements. However, variation in the rate at which claws incorporate local δD values is not well described. We measured δD values in claws of two species of Neotropical-Nearctic migrant wood-warblers (Golden-winged Warbler and Cerulean Warbler) breeding in eastern Ontario, Canada to investigate the rate of δD change through the breeding season and the utility of claw δD values for estimating migratory origins. δD values of claw tips from 66 different individuals, each sampled once during the breeding season, showed an average change of -0.3 to -0.4 per day in the direction of the expected local Ontario value. There were no significant sex or species differences in the rate of change. These results suggest δD values of claw tips in Parulids may reflect those of the non-breeding area for 3-7 weeks after arrival on the breeding grounds, and are useful estimators of non-breeding migratory origin. Our results also suggest that these species may leave the breeding ground before claw tips fully incorporate a local δD signature, as claws sampled at the end of the breeding season did not match locally grown feather and claw δD values. This is the first study to examine the seasonal rate of the change in δD values of claws in long-distance, insectivorous, migratory birds.http://www.ace-eco.org/vol3/iss1/art2/Avian clawconservationmigratory connectivityNeotropical–Nearctic migrantsstable-hydrogen isotopes |
| spellingShingle | Kevin C. Fraser T. Kurt. Kyser Raleigh J. Robertson Laurene M. Ratcliffe Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory Origins Avian Conservation and Ecology Avian claw conservation migratory connectivity Neotropical– Nearctic migrants stable-hydrogen isotopes |
| title | Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory Origins |
| title_full | Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory Origins |
| title_fullStr | Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory Origins |
| title_full_unstemmed | Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory Origins |
| title_short | Seasonal Patterns in Hydrogen Isotopes of Claws from Breeding Wood-Warblers (Parulidae): Utility for Estimating Migratory Origins |
| title_sort | seasonal patterns in hydrogen isotopes of claws from breeding wood warblers parulidae utility for estimating migratory origins |
| topic | Avian claw conservation migratory connectivity Neotropical– Nearctic migrants stable-hydrogen isotopes |
| url | http://www.ace-eco.org/vol3/iss1/art2/ |
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