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  "author": "Tim Oortwijn (Royal Netherlands Institute for Sea 
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  "author": "Tim Oortwijn (Royal Netherlands Institute for Sea 
            
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Research)",
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Research)",
            
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  "author_email": "tim.oortwijn@nioz.nl",
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  "author_email": "tim.oortwijn@nioz.nl",
            
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  "code": "7b.b.nk",
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  "code": "7b.b.nk",
            
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  "contributor": "Royal Netherlands Institute for Sea Research 
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  "contributor": "Royal Netherlands Institute for Sea Research 
            
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(NIOZ)",
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(NIOZ)",
            
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  "creators": 
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  "creators": 
            
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\"Oortwijn\",\"orcid\":\"0000-0002-9254-0498\",\"affiliation\":\"Royal 
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\"Oortwijn\",\"orcid\":\"0000-0002-9254-0498\",\"affiliation\":\"Royal 
            
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Netherlands Institute for Sea 
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Netherlands Institute for Sea 
            
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e,\"contactemailaddress\":\"tim.oortwijn@nioz.nl\",\"formatted\":\"Tim 
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e,\"contactemailaddress\":\"tim.oortwijn@nioz.nl\",\"formatted\":\"Tim 
            
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Oortwijn - Royal Netherlands Institute for Sea Research - ORCID: 
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Oortwijn - Royal Netherlands Institute for Sea Research - ORCID: 
            
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0000-0002-9254-0498 - Corresponding Author - 
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0000-0002-9254-0498 - Corresponding Author - 
            
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tim.oortwijn@nioz.nl\"}]",
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tim.oortwijn@nioz.nl\"}]",
            
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  "deposit_date": "2026-02-14",
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  "deposit_date": "2026-02-14",
            
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  "depositor": "Tim Oortwijn (tim.oortwijn@nioz.nl)",
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  "depositor": "Tim Oortwijn (tim.oortwijn@nioz.nl)",
            
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  "distribution_date": "2026-02-14",
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  "distribution_date": "2026-02-14",
            
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  "distributor": "Research Data Management(NIOZ Royal Netherlands 
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  "distributor": "Research Data Management(NIOZ Royal Netherlands 
            
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Institute for Sea Research)",
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Institute for Sea Research)",
            
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  "doi_date_published": "2026-02-14T12:31:12.7806107",
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  "doi_date_published": "2026-02-14T12:31:12.7806107",
            
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  "maintainer": "Tim",
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  "maintainer": "Tim",
            
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  "maintainer_email": "tim.oortwijn@nioz.nl",
            
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  "name": 
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  "name": 
            
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arly-and-seasonal-variation-in-the-food-of-red-knot-chicks-in-alaska",
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arly-and-seasonal-variation-in-the-food-of-red-knot-chicks-in-alaska",
            
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  "notes": "Studying animal diets using DNA-metabarcoding of faecal 
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  "notes": "Studying animal diets using DNA-metabarcoding of faecal 
            
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samples provides a non-invasive, high-resolution approach to identify 
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samples provides a non-invasive, high-resolution approach to identify 
            
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prey. For long-distance migratory shorebirds, such as red knots 
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prey. For long-distance migratory shorebirds, such as red knots 
            
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(Calidris canutus), chick growth depends on the availability of 
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(Calidris canutus), chick growth depends on the availability of 
            
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surface-dwelling arthropods during the short Arctic summer, yet the 
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surface-dwelling arthropods during the short Arctic summer, yet the 
            
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exact diet of the Alaskan-breeding subspecies (C. c. roselaari) 
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exact diet of the Alaskan-breeding subspecies (C. c. roselaari) 
            
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remains largely unknown. Using metabarcoding, we characterized the 
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remains largely unknown. Using metabarcoding, we characterized the 
            
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diet of red knot chicks in western-Alaska across four summers (2019, 
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diet of red knot chicks in western-Alaska across four summers (2019, 
            
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2022, 2023 and 2024). We identified key arthropod prey taxa and 
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2022, 2023 and 2024). We identified key arthropod prey taxa and 
            
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described how diet composition varied among years and throughout the 
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described how diet composition varied among years and throughout the 
            
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chick period. Diet composition was broadly similar between years, but 
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chick period. Diet composition was broadly similar between years, but 
            
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shifted over the chick-growing period, reflecting temporal changes in 
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shifted over the chick-growing period, reflecting temporal changes in 
            
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prey availability. Weevils (Curculionidae) were the most abundant 
45
prey availability. Weevils (Curculionidae) were the most abundant 
            
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family in the diet (35.8%), especially early in the season, whereas 
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family in the diet (35.8%), especially early in the season, whereas 
            
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owlet moths (Noctuidae, 11.1%), ichneumoid wasps (Ichneumonidae, 
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owlet moths (Noctuidae, 11.1%), ichneumoid wasps (Ichneumonidae, 
            
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8.3%), slugs (Agriolimacidae, 6.5%), house flies (Muscidae, 4.8%), and 
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8.3%), slugs (Agriolimacidae, 6.5%), house flies (Muscidae, 4.8%), and 
            
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crane flies (Tipulidae, 4.4%) became more prominent later in the 
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crane flies (Tipulidae, 4.4%) became more prominent later in the 
            
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season. These patterns suggest that red knot chicks forage 
50
season. These patterns suggest that red knot chicks forage 
            
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opportunistically, with diet composition varying over the season in 
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opportunistically, with diet composition varying over the season in 
            
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response to prey emergence and local environmental conditions. The 
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response to prey emergence and local environmental conditions. The 
            
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limited representation of many prey families in pitfall traps 
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limited representation of many prey families in pitfall traps 
            
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highlights the need for improved sampling designs to fully capture 
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highlights the need for improved sampling designs to fully capture 
            
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prey availability. Together, these findings provide a foundation for 
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prey availability. Together, these findings provide a foundation for 
            
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future work on chick growth, survival, and responses to climate-driven 
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future work on chick growth, survival, and responses to climate-driven 
            
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changes in Arctic ecosystems by tundra-breeding shorebirds.",
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changes in Arctic ecosystems by tundra-breeding shorebirds.",
            
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    {
            
171
      "display_name": "seasonal variation",
193
      "display_name": "seasonal variation",
            
172
      "id": "c63375e9-e9ca-42ae-8ea3-bc4361c26dc5",
194
      "id": "c63375e9-e9ca-42ae-8ea3-bc4361c26dc5",
            
173
      "name": "seasonal variation",
195
      "name": "seasonal variation",
            
174
      "state": "active",
196
      "state": "active",
            
175
      "vocabulary_id": null
197
      "vocabulary_id": null
            
176
    }
198
    }
            
177
  ],
199
  ],
            
178
  "title": "Yearly and seasonal variation in the food of red knot 
200
  "title": "Yearly and seasonal variation in the food of red knot 
            
179
chicks in Alaska",
201
chicks in Alaska",
            
180
  "type": "dataset",
202
  "type": "dataset",
            
181
  "url": "https://doi.org/10.25850/nioz/7b.b.nk",
203
  "url": "https://doi.org/10.25850/nioz/7b.b.nk",
            
182
  "version": "1"
204
  "version": "1"
            
183
}
205
}