{"id":7689,"date":"2024-12-06T12:09:25","date_gmt":"2024-12-06T12:09:25","guid":{"rendered":"https:\/\/marinesites.nl\/?p=7689"},"modified":"2025-06-02T08:36:34","modified_gmt":"2025-06-02T08:36:34","slug":"historical-trophic-ecology-of-some-divergent-shark-and-skate-species-in-the-dutch-coastal-north-sea-zone","status":"publish","type":"post","link":"https:\/\/marinesites.nl\/?p=7689","title":{"rendered":"Historical trophic ecology of some divergent shark and skate species in the Dutch coastal North Sea zone."},"content":{"rendered":"\n<p><strong>Find this article in link below:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/www.researchgate.net\/publication\/355477395_Historical_trophic_ecology_of_some_divergent_shark_and_skate_species_in_the_Dutch_coastal_North_Sea_zone\" data-type=\"link\" data-id=\"https:\/\/www.researchgate.net\/publication\/355477395_Historical_trophic_ecology_of_some_divergent_shark_and_skate_species_in_the_Dutch_coastal_North_Sea_zone\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ResearchGate article<\/strong><\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/marinesites.nl\/wp-content\/uploads\/2025\/06\/Poiesz-et-al_2021_Sharks-and-skates_Supp-A1.pdf\" data-type=\"link\" data-id=\"https:\/\/marinesites.nl\/wp-content\/uploads\/2025\/06\/Poiesz-et-al_2021_Sharks-and-skates_Supp-A1.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Supplementary materials Table A1<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Over the last century the fish community of the Dutch coastal North Sea zone has lost most its shark and skate species.<br \/>\nWhether their disappearance has changed the trophic structure of these shallow waters has not been properly investigated. In<br \/>\nthis study historical dietary data of sharks and skates, being in the past (near)-residents, juvenile marine migrants and marine<br \/>\nseasonal visitors of the Dutch coastal North Sea zone were analyzed for the period 1946\u20131954. Near-resident and juvenile<br \/>\nmarine migrant species were demersal while all marine seasonal visitors species were pelagic. Based on stomach content<br \/>\ncomposition, the trophic position of four of the various shark and skate species could be reconstructed. The (near)-resident<br \/>\nspecies, the lesser spotted dogfish, the marine juvenile migrant, the starry smooth hound, and the benthopelagic marine<br \/>\nseasonal visitor, the thornback ray, had a benthic\/demersal diet (polychaetes, molluscs and crustaceans), while the pelagic<br \/>\nmarine seasonal visitor, the tope shark, fed dominantly on cephalopods and fishes. Diet overlap occurred for fish (tope shark<br \/>\nand lesser spotted dogfish), for hermit crabs (lesser spotted dogfish and starry smooth hound) and for shrimps (thornback<br \/>\nray and starry smooth hound). Trophic position ranged from 3.2 for thornback ray preying exclusively on crustaceans to 4.6<br \/>\nfor the tope shark consuming higher trophic prey (crustaceans and fish). The analysis indicates that most of the shark and<br \/>\nskate species were generalist predators. The calculated trophic positions of shark and skate species indicate that those species<br \/>\nwere not necessarily at the top of the marine ecosystem food web, but they might have been the top predators of their<br \/>\nparticular ecological assemblage.<\/p>\n","protected":false},"author":1,"featured_media":7160,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[13],"tags":[],"class_list":["post-7689","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science"],"_links":{"self":[{"href":"https:\/\/marinesites.nl\/index.php?rest_route=\/wp\/v2\/posts\/7689","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/marinesites.nl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/marinesites.nl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/marinesites.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/marinesites.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7689"}],"version-history":[{"count":2,"href":"https:\/\/marinesites.nl\/index.php?rest_route=\/wp\/v2\/posts\/7689\/revisions"}],"predecessor-version":[{"id":7752,"href":"https:\/\/marinesites.nl\/index.php?rest_route=\/wp\/v2\/posts\/7689\/revisions\/7752"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/marinesites.nl\/index.php?rest_route=\/wp\/v2\/media\/7160"}],"wp:attachment":[{"href":"https:\/\/marinesites.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/marinesites.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/marinesites.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}