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  "code": "7b.b.zd",
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  "code": "7b.b.zd",
            
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  "contributor": "NIOZ Royal Netherlands Institute for Sea Research",
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  "contributor": "NIOZ Royal Netherlands Institute for Sea Research",
            
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  "creator_user_id": "3062cce0-3675-41f1-85fc-dddf19c24cf2",
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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: 
11
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\"},{\"firstname\":\"Luc\",\"lastname\":\"de 
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tim.oortwijn@nioz.nl\"},{\"firstname\":\"Luc\",\"lastname\":\"de 
            
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Monte\",\"orcid\":null,\"affiliation\":\"Royal Netherlands Institute 
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Monte\",\"orcid\":null,\"affiliation\":\"Royal Netherlands Institute 
            
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for Sea 
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for Sea 
            
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spondingauthor\":null,\"contactemailaddress\":null,\"formatted\":\"Luc 
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spondingauthor\":null,\"contactemailaddress\":null,\"formatted\":\"Luc 
            
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de Monte - Royal Netherlands Institute for Sea Research - ORCID: 
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de Monte - Royal Netherlands Institute for Sea Research - ORCID: 
            
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\"},{\"firstname\":\"Daniel 
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\"},{\"firstname\":\"Daniel 
            
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P.\",\"lastname\":\"Varley\",\"orcid\":null,\"affiliation\":\"Royal 
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P.\",\"lastname\":\"Varley\",\"orcid\":null,\"affiliation\":\"Royal 
            
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Netherlands Institute for Sea 
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Netherlands Institute for Sea 
            
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ndingauthor\":null,\"contactemailaddress\":null,\"formatted\":\"Daniel 
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ndingauthor\":null,\"contactemailaddress\":null,\"formatted\":\"Daniel 
            
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P. Varley - Royal Netherlands Institute for Sea Research - ORCID: 
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P. Varley - Royal Netherlands Institute for Sea Research - ORCID: 
            
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\"},{\"firstname\":\"Marcel T.J.\",\"lastname\":\"van der 
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\"},{\"firstname\":\"Marcel T.J.\",\"lastname\":\"van der 
            
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Meer\",\"orcid\":null,\"affiliation\":\"Royal Netherlands Institute 
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Meer\",\"orcid\":null,\"affiliation\":\"Royal Netherlands Institute 
            
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for Sea 
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for Sea 
            
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ndingauthor\":null,\"contactemailaddress\":null,\"formatted\":\"Marcel 
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ndingauthor\":null,\"contactemailaddress\":null,\"formatted\":\"Marcel 
            
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T.J. van der Meer - Royal Netherlands Institute for Sea Research - 
27
T.J. van der Meer - Royal Netherlands Institute for Sea Research - 
            
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ORCID: \"},{\"firstname\":\"Jan A.\",\"lastname\":\"van 
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ORCID: \"},{\"firstname\":\"Jan A.\",\"lastname\":\"van 
            
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Gils\",\"orcid\":\"0000-0002-4132-8243\",\"affiliation\":\"Royal 
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Gils\",\"orcid\":\"0000-0002-4132-8243\",\"affiliation\":\"Royal 
            
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Netherlands Institute for Sea 
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Netherlands Institute for Sea 
            
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arch\",\"iscorrespondingauthor\":null,\"contactemailaddress\":null}]",
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arch\",\"iscorrespondingauthor\":null,\"contactemailaddress\":null}]",
            
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  "dataset_persistent_id": "DOI:10.33591/nioz/7b.b.zd",
            
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  "deposit_date": "2023-01-26",
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  "deposit_date": "2023-01-26",
            
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  "depositor": "Tim Oortwijn",
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  "depositor": "Tim Oortwijn",
            
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  "distribution_date": "2023-01-26",
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  "distribution_date": "2023-01-26",
            
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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": "2023-04-03",
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  "doi_date_published": "2023-04-03",
            
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  "name": "7bbzd",
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  "name": "7bbzd",
            
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  "notes": "In ecology, stable-isotope ratios are widely used to 
48
  "notes": "In ecology, stable-isotope ratios are widely used to 
            
49
determine diets of organisms and reconstruct food webs. This is 
49
determine diets of organisms and reconstruct food webs. This is 
            
50
usually done by analyzing the stable-isotope ratios of nitrogen 
50
usually done by analyzing the stable-isotope ratios of nitrogen 
            
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(\u03b415N), which increase with increasing trophic level, and those 
51
(\u03b415N), which increase with increasing trophic level, and those 
            
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of carbon (\u03b413C), which correlate with the \u03b413C value of 
52
of carbon (\u03b413C), which correlate with the \u03b413C value of 
            
53
food source(s) and generally differ between terrestrial and marine 
53
food source(s) and generally differ between terrestrial and marine 
            
54
food sources. Assimilation of food changes stable-isotope ratios, 
54
food sources. Assimilation of food changes stable-isotope ratios, 
            
55
resulting in different values between the food source and its 
55
resulting in different values between the food source and its 
            
56
consumer. These differences are known as isotope trophic 
56
consumer. These differences are known as isotope trophic 
            
57
discrimination factors and, if known, can be used to determine from 
57
discrimination factors and, if known, can be used to determine from 
            
58
the stable-isotope ratios in the consumer\u2019s tissue what the 
58
the stable-isotope ratios in the consumer\u2019s tissue what the 
            
59
consumer has been eating. What is often ignored is that discrimination 
59
consumer has been eating. What is often ignored is that discrimination 
            
60
factors can differ between consumer\u2019s food sources and also 
60
factors can differ between consumer\u2019s food sources and also 
            
61
between tissue types. Therefore, we performed a controlled feeding 
61
between tissue types. Therefore, we performed a controlled feeding 
            
62
study in red knots Calidris canutus to determine discrimination 
62
study in red knots Calidris canutus to determine discrimination 
            
63
factors between different food sources and red knot tissues. We kept 
63
factors between different food sources and red knot tissues. We kept 
            
64
two groups of red knots in captivity on a stable diet, one group 
64
two groups of red knots in captivity on a stable diet, one group 
            
65
feeding on mudsnails and the other on Trouvit pellets, for several 
65
feeding on mudsnails and the other on Trouvit pellets, for several 
            
66
months, during which the birds molted their feathers. We analyzed 
66
months, during which the birds molted their feathers. We analyzed 
            
67
\u03b413C and \u03b415N in both food sources and in five red knot 
67
\u03b413C and \u03b415N in both food sources and in five red knot 
            
68
tissues (blood cells, blood plasma and three feather types) and 
68
tissues (blood cells, blood plasma and three feather types) and 
            
69
subsequently calculated the isotope discrimination factors. We 
69
subsequently calculated the isotope discrimination factors. We 
            
70
confirmed that the discrimination factors differed between tissues, 
70
confirmed that the discrimination factors differed between tissues, 
            
71
and also between diets. Our values deviated from general averages 
71
and also between diets. Our values deviated from general averages 
            
72
reported in reviews on a wide range of animals/birds, but were very 
72
reported in reviews on a wide range of animals/birds, but were very 
            
73
similar to values from previous red knot and dunlin studies. We 
73
similar to values from previous red knot and dunlin studies. We 
            
74
therefore think that our discrimination factors can be used in future 
74
therefore think that our discrimination factors can be used in future 
            
75
stable isotope studies, not only on red knots, but also on other 
75
stable isotope studies, not only on red knots, but also on other 
            
76
marine shorebird species and plea for careful consideration of using 
76
marine shorebird species and plea for careful consideration of using 
            
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the right discrimination factors.",
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the right discrimination factors.",
            
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