{"datasetrec":{"DasID":4730,"Acronym":null,"StandardTitle":"Ascension Island green turtles migrations","OrigTitle":null,"OrigTitleLangID":null,"OrigTitleLangCode":null,"OrigTitleLang":null,"OrigTitleLangNL":null,"VersionName":null,"ContactEmail":null,"VersionDate":null,"VersionDay":null,"VersionMonth":null,"VersionYear":null,"SizeReference":null,"EngAbstract":"Previous tagging studies of the movements of green turtles (Chelonia mydas) nesting at Ascension Island have shown that they shuttle between this remote target in the Atlantic Ocean and their feeding grounds on the Brazilian coast, a distance of 2300 km or more. Since knowledge of sea turtle migration routes might allow inferences on the still unknown navigational mechanisms of marine animals, we tracked the postnesting migration of six green turtle females from Ascension Island to Brazil.","EngDescr":"Five of them reached the proximity of the easternmost stretch of the Brazilian coast, covering 1777-2342 km in 33-47 days. Their courses were impressively similar for the first 1000 km, with three turtles tracked over different dates following indistinguishable paths for the first 300 km. Only the sixth turtle made some relatively short trips in different directions around Ascension. \r\n
\r\nThe tracks show that turtles (i) are able to maintain straight courses over long distances in the open sea; (ii) may perform exploratory movements in different directions; (iii) appropriately correct their course during the journey according to external information; and (iv) initially keep the same direction as the west-south-westerly flowing current, possibly guided by chemical cues.\r\n
\r\n
\r\nPurpose: Luschi et al. (1998) reconstructed the routes followed by turtles leaving the island for their postnesting migration, to evaluate their navigational performance. This would then allow a re-examination of the hypotheses so far proposed about the navigational system used by these turtles to pinpoint Ascension, assuming that the same mechanisms guide the postnesting migration as well. Results show that Ascension turtles use information picked up en route to adjust their migratory course, and suggest that current-borne cues, probably of a chemical nature, may be involved in this process for at least part of the journey. Papi et al. (2000) reports the results of an experiment aimed to test the geomagnetic hypothesis by applying a magnetic disturbance to Ascension turtles returning to Brazil. If this disturbance were to impair the orientation of the turtles, this interesting hypothesis would receive its first experimental support. However, the results obtained show that magnetic cues are not essential for oceanic navigation by adult turtles migrating to Brazil. This dataset is a summarized representation of the telemetry locations aggregated per species per 1-degree cell.","OrigAbstract":null,"OrigDescr":null,"Comments":null,"ReleaseDate":null,"ReleaseDate0":null,"OrigDescrLang":null,"EmbargoDate":null,"OrigDescrLangNL":null,"OrigLangCode":null,"OrigLangCodeExtended":null,"OrigLangID":null,"DescrCompFlag":0,"DescrTransFlag":0,"Citation":"Luschi, P., G.C. Hays, C. Del Seppia, R. Marsh and F. Papi. 1998. The navigational feats of green sea turtles migrating from Ascension Island investigated by satellite telemetry. Proceedings of the Royal Society: Biological Sciences. 265: 2279-2284","AccessConstraints":null,"UDate":"2015-02-19","CDate":"2015-02-19","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-05-14 01:44:00.153333","timezone_type":1,"timezone":"+02:00"},"CheckedFlag":0,"PublicFlag":1,"VlizCoreFlag":1,"MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"StatusID":1,"DasType":"Data","DasTypeID":1,"DasOrigin":"Research: field survey","Progress":"Completed","AccessConstraint":"Attribution (CC BY)","AccConstrEN":"Attribution (CC BY)","AccConstrDisplay":"\"Creative This dataset is licensed under a Creative Commons Attribution 4.0 International License.","License":"https://creativecommons.org/licenses/by/4.0/","AccConstrDescription":"This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered. Recommended for maximum dissemination and use of licensed materials.","Lineage":null,"AccConID":21},"dois":null,"spcols":null,"keywords":[{"ThesaurusTerm":"Ascension I.","ThesTypID":34,"ThesType":"ASFA Geoterms","Code":null,"Description":null,"OrigThesTerm":"Ascension I.","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Brazil","ThesTypID":34,"ThesType":"ASFA Geoterms","Code":null,"Description":null,"OrigThesTerm":"Brazil","DutchTerm":null,"URI":null,"DasKeywordDescr":null}],"parents":null,"children":null,"othrel":null,"othrelrev":[{"DasID":1865,"Acronym":"OBIS-SEAMAP","StandardTitle":"Spatial Ecological Analysis of Megavertebrate Populations","Relation":"Published dataset","RelationY":"Published in","RelID":13,"doi":null,"vlizDoi":null}],"ownerships":[{"OrderNr":1,"Surname":"Luschi","Firstname":"Paolo","Initials":"P.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":null,"OrigNameLangCode":"it","OrigNameLangID":32,"FullOrigName":"Università di Pisa","InsOwnerCNT":2,"PersID":24975,"InsID":4511,"FullInstitute":"University of Pisa","RoleID":61,"Role":"Data creator","OrigName":"Università di Pisa","StandardName":"University of Pisa","FullAcronym":null,"ORC":null,"ROR":null},{"OrderNr":3,"Surname":"Luschi","Firstname":"Paolo","Initials":"P.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":null,"OrigNameLangCode":"it","OrigNameLangID":32,"FullOrigName":"Università di Pisa","InsOwnerCNT":2,"PersID":24975,"InsID":4511,"FullInstitute":"University of Pisa","RoleID":24,"Role":"Contact","OrigName":"Università di Pisa","StandardName":"University of Pisa","FullAcronym":null,"ORC":null,"ROR":null}],"taxterms":[{"DasTaxtTypID":1,"DasTaxtType":"Taxonomic coverage","TaxtID":23249,"TaxTerm":"Chelonia mydas","AphiaID":137206,"DutchTerm":null}],"frameworks":null,"otherterms":null,"temporal":[{"DasDateID":3561,"StartYear":1997,"EndYear":1998,"StartDay":27,"EndDay":20,"StartDate":"1997-04-27","EndDate":"1998-08-20","DasDate":null,"Resolution":null,"ResolutionNL":null,"Notes":null,"StartMonth0":4,"StartMonth":"April","StartMonthNL":"April","EndMonth0":8,"EndMonth":"August","EndMonthNL":"Augustus","Progress":"Completed","ProgressNL":"Afgelopen"}],"geographical":[{"GeoTerm":"Ascension","DasGeoID":7295,"DasGeoTerm":null,"DasID":4730,"GeotID":844,"X":null,"Y":null,"MaxX":null,"MaxY":null,"StationName":null,"Precision":null,"CoordSystID":null,"GeoDatumID":null,"OrigCoordMinX":null,"OrigCoordMinY":null,"OrigCoordMaxX":null,"OrigCoordMaxY":null,"OrderNr":null,"Projection":null,"GeoDatum":null,"GeoObjectID":19012,"OrigGeoTerm":"Ascension","DutchTerm":null},{"GeoTerm":"Brazil","DasGeoID":7296,"DasGeoTerm":null,"DasID":4730,"GeotID":987,"X":null,"Y":null,"MaxX":null,"MaxY":null,"StationName":null,"Precision":null,"CoordSystID":null,"GeoDatumID":null,"OrigCoordMinX":null,"OrigCoordMinY":null,"OrigCoordMaxX":null,"OrigCoordMaxY":null,"OrderNr":null,"Projection":null,"GeoDatum":null,"GeoObjectID":2143,"OrigGeoTerm":"Brazil","DutchTerm":null}],"meastypes":null,"dasthemes":[{"DasThemeID":71,"DasTheme":"Biology > Reptiles","DasTheme0":"Reptiles","DutchTerm":"Reptielen"}],"projects":null,"refs":[{"0":248466,"BRefID":248466,"1":"Based on this dataset","Relation":"Based on this dataset","2":2,"RelationID":2,"3":"Papi, F. et al. (2000). Open-sea migration of magnetically disturbed sea turtles. J. Exp. Biol. 203: 3435–3443","RR":"Papi, F. et al. (2000). Open-sea migration of magnetically disturbed sea turtles. J. Exp. Biol. 203: 3435–3443","4":"Open-sea migration of magnetically disturbed sea turtles","StT":"Open-sea migration of magnetically disturbed sea turtles","5":"Papi, F.; Luschi, P.; Åkesson, S.; Capogrossi, S.; Hays, G.C.","RSA":"Papi, F.; Luschi, P.; Åkesson, S.; Capogrossi, S.; Hays, G.C.","6":"Gebaseerd op deze dataset","DutchTerm":"Gebaseerd op deze dataset","7":2000,"AnaDate":2000,"8":null,"MonDate":null,"9":". J. Exp. Biol. 203: 3435–3443","":". J. Exp. Biol. 203: 3435–3443","10":null,"doi":null},{"0":26898,"BRefID":26898,"1":"Based on this dataset","Relation":"Based on this dataset","2":2,"RelationID":2,"3":"Luschi, P. et al. (1998). The navigational feats of green sea turtles migrating from Ascension Island investigated by satellite telemetry. Proc. - Royal Soc., Biol. Sci. 265: 2279-2284","RR":"Luschi, P. et al. (1998). The navigational feats of green sea turtles migrating from Ascension Island investigated by satellite telemetry. Proc. - Royal Soc., Biol. Sci. 265: 2279-2284","4":"The navigational feats of green sea turtles migrating from Ascension Island investigated by satellite telemetry","StT":"The navigational feats of green sea turtles migrating from Ascension Island investigated by satellite telemetry","5":"Luschi, P.; Hays, G.C.; Del Seppia, C.; Marsh, R.; Papi, F.","RSA":"Luschi, P.; Hays, G.C.; Del Seppia, C.; Marsh, R.; Papi, F.","6":"Gebaseerd op deze dataset","DutchTerm":"Gebaseerd op deze dataset","7":1998,"AnaDate":1998,"8":null,"MonDate":null,"9":". Proc. - Royal Soc., Biol. Sci. 265: 2279-2284","":". Proc. - Royal Soc., Biol. 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