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Occurrences not based on the entire range of particular populations or subpopulations, but rather on distinct areas that are important to the survival of these populations.   Minimally, at least two and preferably several years of observation should be used to reliably identify significant, recurrent occurrences.","mappingGuidance":null,"separationBarriers":"Upland areas.","separationDistanceUnsuitableHabitatat":20.0,"separationDistanceSuitableHabitatat":20.0,"altSeparationProcedure":null,"separationJustification":"Separation Distance arbitrary.  In most cases, occurrences should not be extensive areas but rather portions of such areas that stand out as strongly meeting the occurrence criteria. <br> Available information on genetics, dispersion, and movement patterns of most populations generally is insufficient to determine biologically meaningful separation distances for occurrences. The separation distance used here does not attempt to identify biologically distinct populations but rather is an arbitrary value that attempts to identify relatively distinct geographic areas that have frequent or concentrated activity and that are of practical size. <br> Bottlenose Dolphins (TURSIOPS TRUNCATUS) that were resident in a South Carolina estuary had relatively small home ranges (mean  51.3 square kilometers, 95% adaptive kernel method; Gubbins 2002).","versionDate":"2002-03-06","versionAuthor":"Cannings, S.","versionNotes":"Contains all members of the families Delphinidae and Phocoenidae, except ORCINUS ORCA.","lastModified":"2020-04-30T02:04:20.034948Z"}],"plantCharacteristics":null,"elementManagement":{"elementGlobalId":103916,"eoManagementGroupName":null,"stewardshipOverview":null,"impacts":null,"restorationPotential":null,"siteConservationPlansConsidered":null,"managementMethods":"Harbor porpoises in the Gulf of Maine and Bay of Fundy appear to comprise a relatively discrete population unit that can be managed as a separate stock (NMFS 1999).<br>","monitoringMethods":null,"managementProgramContacts":null,"monitoringProgramContacts":null,"managementResearchPrograms":null,"managementResearchNeeds":null,"biologicalResearchNeeds":null,"additionalTopics":null},"occurrenceViabilities":[{"eoRankSpecsDetailId":105378,"eoRankSpecsGroupName":null,"locationUseClass":{"id":1,"locationUseClassDescEn":"Not applicable","locationUseClassDescEs":"No se aplica","locationUseClassDescFr":"Sans objet","displayOrder":1},"excellentViability":null,"goodViability":null,"fairViability":null,"poorViability":null,"viabilityJustification":"Use the Generic Guidelines for the Application of Occurrence Ranks (2008).<br>The Key for Ranking Species Occurrences Using the Generic Approach provides a step-wise process for implementing this method.","versionDate":null,"versionAuthor":null,"versionNotes":null,"lastModified":"2020-05-14T02:25:16.524365Z"}],"references":[{"id":1151804,"citation":"American Society of Mammalogists (ASM). 2025. 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