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  "author": null,
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  "author": null,
            
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  "author_email": null,
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  "author_email": null,
            
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  "code": "7b.b.0",
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  "code": "7b.b.0",
            
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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": "151ba74d-5dc2-4c8c-9218-11801da2d1eb",
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  "creator_user_id": "151ba74d-5dc2-4c8c-9218-11801da2d1eb",
            
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  "creators": 
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  "creators": 
            
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\"firstname\":\"Roeland\",\"lastname\":\"Bom\",\"affiliation\":\"Royal 
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\"firstname\":\"Roeland\",\"lastname\":\"Bom\",\"affiliation\":\"Royal 
            
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Netherlands Institute for Sea 
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Netherlands Institute for Sea 
            
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rrespondingauthor\":true},{\"firstname\":\"Anieke\",\"lastname\":\"van 
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rrespondingauthor\":true},{\"firstname\":\"Anieke\",\"lastname\":\"van 
            
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Leeuwen\",\"affiliation\":\"Royal Netherlands Institute for Sea 
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Leeuwen\",\"affiliation\":\"Royal Netherlands Institute for Sea 
            
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:\"\",\"contactemailaddress\":\"\",\"iscorrespondingauthor\":false}]",
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:\"\",\"contactemailaddress\":\"\",\"iscorrespondingauthor\":false}]",
            
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  "dataset_persistent_id": "DOI:10.25850/nioz/7b.b.0",
            
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  "dates": 
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  "dates": 
            
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0:00\",\"dateto\":\"\",\"type\":\"collected\",\"information\":\"\"}]",
            
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  "deposit_date": "2020-05-04",
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  "deposit_date": "2020-05-04",
            
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  "depositor": "Roeland Bom",
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  "depositor": "Roeland Bom",
            
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  "distribution_date": "2020-05-04",
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  "distribution_date": "2020-05-04",
            
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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": "2020-05-04",
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  "doi_date_published": "2020-05-04",
            
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  "funding_references": 
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  "funding_references": 
            
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  "geographic_coverage": "[{\"place\":\"North 
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  "geographic_coverage": "[{\"place\":\"North 
            
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\"\",\"longitude_1\":\"\",\"latitude_2\":\"\",\"longitude_2\":\"\"}]",
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  "license_id": "CC0-1.0",
            
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  "license_title": "CC0 1.0",
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  "license_title": "CC0 1.0",
            
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  "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
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  "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
            
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  "metadata_created": "2024-10-22T09:42:00.985695",
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  "metadata_created": "2024-10-22T09:42:00.985695",
            
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  "metadata_modified": "2024-10-22T20:29:17.616806",
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  "metadata_modified": "2026-09-14T12:25:07.012514",
            
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  "name": "7bb0",
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  "name": "7bb0",
            
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  "notes": "There is a growing call to restore the natural richness of 
37
  "notes": "There is a growing call to restore the natural richness of 
            
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the North Sea, but it is often unclear what this natural richness 
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the North Sea, but it is often unclear what this natural richness 
            
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actually was. Here we review the demise and the historical ecology of 
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actually was. Here we review the demise and the historical ecology of 
            
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an iconic species, the critically endangered Angelshark Squatina 
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an iconic species, the critically endangered Angelshark Squatina 
            
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squatina in the southern North Sea, using historical books and catch 
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squatina in the southern North Sea, using historical books and catch 
            
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records of 104 individuals brought to the Dutch fish markets. These 
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records of 104 individuals brought to the Dutch fish markets. These 
            
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sources reveal that between 1600 and 1950, Angelsharks were annual 
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sources reveal that between 1600 and 1950, Angelsharks were annual 
            
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visitors to the North Sea, and in some years were fairly commonly 
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visitors to the North Sea, and in some years were fairly commonly 
            
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observed. The number of recorded individuals peaked in the early 20th 
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observed. The number of recorded individuals peaked in the early 20th 
            
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century and between 1945-1955, and declining rapidly in the 1960s, 
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century and between 1945-1955, and declining rapidly in the 1960s, 
            
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with the last recorded observation in 1973. The decline coincides with 
47
with the last recorded observation in 1973. The decline coincides with 
            
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the introduction of engine-powered fisheries, whereas the full 
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the introduction of engine-powered fisheries, whereas the full 
            
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extirpation followed the increased use of diesel-powered 
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extirpation followed the increased use of diesel-powered 
            
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beam-trawlers. The recorded observations of Angelsharks were most 
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beam-trawlers. The recorded observations of Angelsharks were most 
            
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commonly from the summer season, in accordance with the prevailing 
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commonly from the summer season, in accordance with the prevailing 
            
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notion of Angelsharks migrating to warmer waters in winter. 
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notion of Angelsharks migrating to warmer waters in winter. 
            
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Furthermore, most recorded catches were of newborns and adult females 
53
Furthermore, most recorded catches were of newborns and adult females 
            
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in shallow waters, showcasing the importance of the area for 
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in shallow waters, showcasing the importance of the area for 
            
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parturition and nursery. Our review exemplifies how a large predator 
55
parturition and nursery. Our review exemplifies how a large predator 
            
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disappeared from a marine food web and shows the importance of 
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disappeared from a marine food web and shows the importance of 
            
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historical data to deduce the natural richness of the North Sea.",
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historical data to deduce the natural richness of the North Sea.",
            
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    "approval_status": "approved",
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    "approval_status": "approved",
            
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    "state": "active",
            
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    "title": "Royal Netherlands Institute for Sea Research",
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      "id": "1e3a1977-cb23-4da6-9c2b-99c66299d25b",
            
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      "last_modified": "2024-10-22T09:42:01.291009",
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      "last_modified": "2024-10-22T09:42:01.291009",
            
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      "metadata_modified": "2024-10-22T09:42:01.729895",
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      "mimetype": "text/csv",
            
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      "mimetype_inner": null,
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      "mimetype_inner": null,
            
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      "name": "SupplementaryMaterial_IndividualAngelShark.csv",
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      "name": "SupplementaryMaterial_IndividualAngelShark.csv",
            
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      "package_id": "24dcdda2-e1a6-4d6e-8623-63003630f79c",
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      "size": 21456,
            
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      "state": "active",
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      "state": "active",
            
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      "url": 
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      "url": 
            
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99c66299d25b/download/supplementarymaterial_individualangelshark.csv",
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99c66299d25b/download/supplementarymaterial_individualangelshark.csv",
            
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      "url_type": "upload"
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      "url_type": "upload"
            
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    }
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    }
            
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  ],
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  ],
            
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  "state": "active",
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  "state": "active",
            
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  "subject": "Earth and Environmental Sciences",
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  "subject": "Earth and Environmental Sciences",
            
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  "tags": [
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  "tags": [
            
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    {
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    {
            
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      "display_name": "Dutch coastal waters",
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      "display_name": "Dutch coastal waters",
            
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      "id": "762c580f-6346-4969-88af-9715fecf2f2c",
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      "id": "762c580f-6346-4969-88af-9715fecf2f2c",
            
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      "name": "Dutch coastal waters",
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      "name": "Dutch coastal waters",
            
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    },
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    },
            
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    {
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    {
            
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      "display_name": "Squatina squatina",
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      "display_name": "Squatina squatina",
            
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      "id": "63c44bc4-8714-40c8-9096-f38c90f4b7fd",
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      "id": "63c44bc4-8714-40c8-9096-f38c90f4b7fd",
            
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      "name": "Squatina squatina",
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      "name": "Squatina squatina",
            
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      "state": "active",
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      "state": "active",
            
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    },
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    },
            
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    {
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    {
            
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      "display_name": "critically endangered",
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      "display_name": "critically endangered",
            
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      "id": "61d7b12d-897d-474b-978d-bb4edcae64ae",
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      "id": "61d7b12d-897d-474b-978d-bb4edcae64ae",
            
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      "name": "critically endangered",
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      "name": "critically endangered",
            
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      "state": "active",
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      "state": "active",
            
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      "vocabulary_id": null
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      "vocabulary_id": null
            
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    },
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    },
            
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    {
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    {
            
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      "display_name": "large marine predator",
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      "display_name": "large marine predator",
            
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      "id": "49b2e053-776e-478b-83da-35d3c8cc5e6f",
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      "id": "49b2e053-776e-478b-83da-35d3c8cc5e6f",
            
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      "name": "large marine predator",
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      "name": "large marine predator",
            
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      "state": "active",
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      "state": "active",
            
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      "vocabulary_id": null
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      "vocabulary_id": null
            
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    },
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    },
            
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    {
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    {
            
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      "display_name": "nursery ground",
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      "display_name": "nursery ground",
            
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      "id": "025655ad-e686-480e-8fff-c27527ad56ec",
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      "id": "025655ad-e686-480e-8fff-c27527ad56ec",
            
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      "name": "nursery ground",
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      "name": "nursery ground",
            
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      "state": "active",
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      "state": "active",
            
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      "vocabulary_id": null
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      "vocabulary_id": null
            
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    },
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    },
            
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    {
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    {
            
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      "display_name": "overfishing",
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      "display_name": "overfishing",
            
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      "id": "7d77aa40-ab07-481c-90ca-b0ac7ad79cd9",
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      "id": "7d77aa40-ab07-481c-90ca-b0ac7ad79cd9",
            
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      "name": "overfishing",
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      "name": "overfishing",
            
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      "state": "active",
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      "state": "active",
            
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      "vocabulary_id": null
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    },
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    },
            
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    {
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    {
            
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      "display_name": "parturition",
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      "display_name": "parturition",
            
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      "id": "03c700ef-1bb6-4355-810c-b83dfb0f308b",
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      "id": "03c700ef-1bb6-4355-810c-b83dfb0f308b",
            
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      "name": "parturition",
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      "name": "parturition",
            
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      "state": "active",
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      "state": "active",
            
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      "vocabulary_id": null
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      "vocabulary_id": null
            
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    }
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    }
            
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  ],
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  ],
            
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  "title": "SupplementaryMaterial_IndividualAngelShark",
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  "title": "SupplementaryMaterial_IndividualAngelShark",
            
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  "type": "dataset",
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  "type": "dataset",
            
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  "url": "https://dataportal.nioz.nl/doi/10.25850/nioz/7b.b.0",
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  "url": "https://dataportal.nioz.nl/doi/10.25850/nioz/7b.b.0",
            
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  "version": "2"
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  "version": "7"
            
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}
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}