![\"Creative](\"https://www.marinespecies.org/aphia/images/cc/by.png\")
As part of the NOVANA monitoring project (novana.au.dk), C-POD data loggers (Chelonia Limited) have been deployed in Inner Danish Waters since 2004 to monitor the presence of harbour porpoises (Phocoena phocoena).
Denmark's three most numerous marine mammals are the harbour seal, the grey seal and the harbour porpoise. All three species are protected in Denmark and under the EU Habitats Directive. Harbour porpoises and both seal species are mentioned in the Habitats Directive's annex lists of species in need of protection. Protected areas, so-called habitat areas under Natura 2000, have been designated for all three species. Harbour porpoises must also be protected throughout their entire range, and seal species may require additional management measures if monitoring shows that their range and numbers are declining. In Danish waters, there are also large permanent populations of white-beaked dolphins and minke whales in the Danish part of the northern North Sea and Skagerrak, smaller groups of bottlenose dolphins scattered in Danish waters and individual groups of killer whales, primarily in Skagerrak. All whale species must be protected throughout their entire range.
","EngDescr":null,"OrigAbstract":null,"OrigDescr":null,"Comments":null,"ReleaseDate":null,"ReleaseDate0":null,"OrigDescrLang":null,"EmbargoDate":null,"OrigDescrLangNL":null,"OrigLangCode":null,"OrigLangCodeExtended":null,"OrigLangID":null,"DescrCompFlag":null,"DescrTransFlag":null,"Citation":"Aarhus University (AU), Denmark; (2026): NOVANA: The National Programme for Monitoring the Aquatic Environment and Nature: Cetacean passive acoustic sensor network (2011-2021).","AccessConstraints":null,"UDate":"2026-07-15","CDate":"2026-04-09","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-07-15 09:54:35.852720","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 experiment","Progress":"In Progress","AccessConstraint":"Attribution (CC BY)","AccConstrEN":"Attribution (CC BY)","AccConstrDisplay":" 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":[{"DOIID":1364,"PublicationYear":2026,"DOI":"10.14284/809","Citation":"Aarhus University (AU), Denmark; (2026): NOVANA: The National Programme for Monitoring the Aquatic Environment and Nature: Cetacean passive acoustic sensor network (2011-2021).","MDAID":null,"Moratorium":0,"MDAURL":null,"CurrentDOI":1,"Active":1,"URL":null,"downloadURL":null}],"spcols":[{"SpColID":1000,"SpName":"European Tracking Network"}],"keywords":[{"ThesaurusTerm":"Acoustic arrays","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_2cdfca90","Description":null,"OrigThesTerm":"Acoustic arrays","DutchTerm":null,"URI":"http://aims.fao.org/aos/agrovoc/c_2cdfca90","DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic data","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_54b338c3","Description":null,"OrigThesTerm":"Acoustic data","DutchTerm":null,"URI":"http://aims.fao.org/aos/agrovoc/c_54b338c3","DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic devices","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":null,"Description":null,"OrigThesTerm":"Acoustic devices","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"C-PODs","ThesTypID":0,"ThesType":null,"Code":null,"Description":null,"OrigThesTerm":"C-PODs","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"F-PODs","ThesTypID":0,"ThesType":null,"Code":null,"Description":null,"OrigThesTerm":"F-PODs","DutchTerm":"F-PODs","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Hydrophones","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_2283ec53","Description":null,"OrigThesTerm":"Hydrophones","DutchTerm":"Hydrofonen","URI":"http://aims.fao.org/aos/agrovoc/c_2283ec53","DasKeywordDescr":null},{"ThesaurusTerm":"Marine mammals","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_22acc50e","Description":null,"OrigThesTerm":"Marine mammals","DutchTerm":"Zeezoogdieren","URI":"http://aims.fao.org/aos/agrovoc/c_22acc50e","DasKeywordDescr":null},{"ThesaurusTerm":"Passive acoustic monitoring (PAM)","ThesTypID":0,"ThesType":null,"Code":null,"Description":null,"OrigThesTerm":"Passive acoustic monitoring (PAM)","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Underwater Acoustics","ThesTypID":30,"ThesType":"ETN Context","Code":null,"Description":"Passive acoustic recordings","OrigThesTerm":"Underwater Acoustics","DutchTerm":"Onderwater Akoestiek","URI":null,"DasKeywordDescr":null}],"parents":[{"DasID":5912,"Acronym":null,"EngAbstract":"The European Tracking Network is a pan-European biotelemetry network that aims at the integration of regional telemetry initiatives into a sustainable, efficient and integrated network embedded in the international context. Data is integrated in the ETN data system that is part of the ETN virtual lab developed by LifeWatch.","License":"https://creativecommons.org/licenses/by/4.0/","StandardTitle":"European Tracking Network (ETN) data","doi":null,"vlizDoi":null}],"children":null,"othrel":null,"othrelrev":null,"ownerships":[{"OrderNr":1,"Surname":"Griffiths","Firstname":"Emily T.","Initials":"E.T.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"AU","OrigNameLangCode":"da","OrigNameLangID":12,"FullOrigName":"Århus Universitet","InsOwnerCNT":5,"PersID":45673,"InsID":4197,"FullInstitute":"University of Aarhus","RoleID":24,"Role":"Contact","OrigName":"Århus Universitet","StandardName":"University of Aarhus","FullAcronym":"AU","ORC":"https://orcid.org/0000-0002-0781-6091","ROR":null},{"OrderNr":2,"Surname":"Griffiths","Firstname":"Emily T.","Initials":"E.T.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"AU","OrigNameLangCode":"da","OrigNameLangID":12,"FullOrigName":"Århus Universitet","InsOwnerCNT":5,"PersID":45673,"InsID":4197,"FullInstitute":"University of Aarhus","RoleID":59,"Role":"Principal Investigator","OrigName":"Århus Universitet","StandardName":"University of Aarhus","FullAcronym":"AU","ORC":"https://orcid.org/0000-0002-0781-6091","ROR":null},{"OrderNr":3,"Surname":"Debusschere","Firstname":"Elisabeth","Initials":"E.","PerPublicFlag":1,"AdrID":167751,"Email":"elisabeth.debusschere@vliz.be","InsPublicFlag":1,"Acronym":"VLIZ","OrigNameLangCode":"en","OrigNameLangID":15,"FullOrigName":"Flanders Marine Institute","InsOwnerCNT":1,"PersID":25977,"InsID":36,"FullInstitute":"Vlaams Instituut voor de Zee","RoleID":24,"Role":"Contact","OrigName":"Flanders Marine Institute","StandardName":"Vlaams Instituut voor de Zee","FullAcronym":"VLIZ","ORC":"https://orcid.org/0000-0002-5595-0295","ROR":"https://ror.org/0496vr396"},{"OrderNr":4,"Surname":"Jacobs","Firstname":"Ellen","Initials":"E.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"AU","OrigNameLangCode":"da","OrigNameLangID":12,"FullOrigName":"Århus Universitet","InsOwnerCNT":5,"PersID":46308,"InsID":4197,"FullInstitute":"University of Aarhus","RoleID":24,"Role":"Contact","OrigName":"Århus Universitet","StandardName":"University of Aarhus","FullAcronym":"AU","ORC":null,"ROR":null},{"OrderNr":5,"Surname":"Nielsen","Firstname":"Mia Lybkær Kronborg","Initials":"M.L.K.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"AU","OrigNameLangCode":"da","OrigNameLangID":12,"FullOrigName":"Århus Universitet","InsOwnerCNT":5,"PersID":46309,"InsID":4197,"FullInstitute":"University of Aarhus","RoleID":24,"Role":"Contact","OrigName":"Århus Universitet","StandardName":"University of Aarhus","FullAcronym":"AU","ORC":"https://orcid.org/0000-0002-3488-6263","ROR":null},{"OrderNr":6,"Surname":null,"Firstname":null,"Initials":null,"PerPublicFlag":null,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"AU","OrigNameLangCode":"da","OrigNameLangID":12,"FullOrigName":"Århus Universitet","InsOwnerCNT":5,"PersID":null,"InsID":4197,"FullInstitute":"University of Aarhus","RoleID":61,"Role":"Data creator","OrigName":"Århus Universitet","StandardName":"University of Aarhus","FullAcronym":"AU","ORC":null,"ROR":null}],"taxterms":[{"DasTaxtTypID":1,"DasTaxtType":"Taxonomic coverage","TaxtID":12185,"TaxTerm":"Phocoena phocoena (Linnaeus, 1758)","AphiaID":137117,"DutchTerm":"Bruinvis"}],"frameworks":null,"otherterms":[{"OtherTerm":"C-PODs"},{"OtherTerm":"F-PODs"},{"OtherTerm":"Passive acoustic monitoring (PAM)"}],"temporal":[{"DasDateID":7765,"StartYear":2011,"EndYear":2021,"StartDay":null,"EndDay":null,"StartDate":"2011-01-01","EndDate":"2021-01-01","DasDate":null,"Resolution":"Quasi continuous (< 1 min.)","ResolutionNL":"Quasi continu (< 1 min.)","Notes":null,"StartMonth0":null,"StartMonth":null,"StartMonthNL":null,"EndMonth0":null,"EndMonth":null,"EndMonthNL":null,"Progress":"In Progress","ProgressNL":"Gestart"}],"geographical":[{"GeoTerm":"Danish Internal Waters","DasGeoID":15392,"DasGeoTerm":null,"DasID":9050,"GeotID":9698,"X":10.660399999999999,"Y":55.691499999999998,"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":49473,"OrigGeoTerm":"Danish Internal Waters","DutchTerm":null}],"meastypes":[{"MethID":770,"DasMeasTypID":24471,"DasMeasType":"","Matrix":"Water","MatrixNL":"Water","Parameter":"Buzz-Positive Minutes","ParameterNL":"","Description":null,"Unit":"minutes","Methodology":"ICI < 8 ms (DeRuiter et al. 2009)","Protocol":1,"QualityControl":null,"Precision":null,"Detectionlimit":null,"Instrument":null,"InstrumentUrl":null,"MethFull":"