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A., F. I. Archer, and K. M. Robertson. 2024. The long-beaked common dolphin of the eastern Pacific Ocean: Taxonomic status and redescription of Delphinus bairdii. Marine Mammal Science e13133:1-37.","conceptName":"<i>Delphinus delphis</i>","taxonomicComments":"Species in <i>Delphinus </i>have had a confusing taxonomic history. Wilson and Reeder (1993) included <i>D. bairdii</i>, <i>D. capensis</i>, and <i>D. tropicalis</i> in <i>D. delphis</i>. Heyning and Perrin (1994) found two distinct forms, a short-beaked form regarded as <i>D. capensis</i> (with <i>D. bairdii</i> as a junior synonym), and a long-beaked form regarded as <i>D. delphis</i>. They noted that the status of <i>D. tropicalis</i> needed to be examined. Wilson and Reeder (2005) recognized <i>D. capensis</i> and <i>D. delphis</i> (but not <i>D. tropicalis</i>) as distinct species. Jefferson et al. (2024) and the American Society of Mammalogists (ASM 2025) recognize <i>D. bairdii</i> and <i>D delphis</i> (with <i>D. capensis</i> as a junior synonym).","roundedGRank":"G5","conservationStatusFactorsEditionDate":"1995-02-16","conservationStatusFactorsEditionAuthors":"Hammerson, 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In the Pacific Ocean, ranges from British Columbia south to Chile and out to 135 degrees west longitude; there are few records from the Gulf of California; documented from New Caledonia, New Zealand, and Japanese waters in the western Pacific, and there are records from north of Hawaii; range may extend entirely across the tropical and temperate North Pacific; records from the western Atlantic range from at least Florida to Newfoundland and in the eastern Atlantic from northern Europe to the west coast of Africa (Heyning and Perrin 1994). Abundant in waters of eastern North America, ranging north in large numbers to near Nova Scotia and Newfoundland in summer; otherwise, generally ranges from Gulf of Maine to Chesapeake Bay area (Gaskin 1992). 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See IUCN (1991) for population estimates and trend information for other parts of the range (most data are difficult to interpret).","viabilityComments":null,"threatImpactComments":"Relatively heavily exploited in the yellowfin tuna industry of the eastern tropical Pacific (1987 kill was estimated at about 20,000; not subject to any particular threat in waters off North America (Gaskin 1992). 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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":105591,"eoManagementGroupName":null,"stewardshipOverview":null,"impacts":null,"restorationPotential":null,"siteConservationPlansConsidered":null,"managementMethods":null,"monitoringMethods":null,"managementProgramContacts":null,"monitoringProgramContacts":null,"managementResearchPrograms":null,"managementResearchNeeds":null,"biologicalResearchNeeds":null,"additionalTopics":null},"occurrenceViabilities":[{"eoRankSpecsDetailId":107013,"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":"2020-05-14T02:29:23.028098Z"}],"references":[{"id":1151804,"citation":"American Society of Mammalogists (ASM). 2025. 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