A Middle Pleistocene Sea Otter from Northern California and the Antiquity of Enhydra in the Pacific Basin

Original Paper

Abstract

Extant sea otters (Enhydra lutris) are remarkably well understood in terms of behavior, ecology, and interactions with humans, but the evolutionary history of this charismatic marine mammal is limited owing to a fragmentary fossil record. Disagreements over the generic assignment of various fossil otter remains to members of the tribe Enhydrini, and limited geochronologic data for these records have impeded attempts to interpret the evolutionary biogeography of Enhydra. A well-preserved femur of Enhydra sp. from a middle Pleistocene horizon within the Merced Formation of northern California is the oldest record of Enhydra in the Pacific with robust geochronologic age control. Bracketing 87Sr/86Sr dates indicate an age of 620–670 ka. Reappraisal of the geochronologic age of various occurrences of Enhydrini indicate dispersal of Enhydra into the Pacific through the Bering Strait no earlier than the middle Pleistocene. Somewhat older early Pleistocene fossils of Enhydra from Alaska and England suggest an Arctic or North Atlantic origin of the Enhydra lineage.

Keywords

Enhydra Lutrinae Sea otter Pleistocene Pacific 

References

  1. Barnes LG, Hutchison JH, Howard H, Welton BJ (1981) The vertebrate fossils of the marine Cenozoic San Mateo Formation at Oceanside, California. In: Abbott PL, O’Dunn S (eds) Geologic Investigations of the Coastal Plain, San Diego County, California. San Diego Association of Geologists, San Diego, pp 53–70Google Scholar
  2. Barnes LG, Ray CE, Koretsky IA (2006) A new Pliocene sea lion, Proterozetes ulysses (Mammalia: Otariidae) from Oregon, U.S.A. In: Csiki Z (ed) Mesozoic and Cenozoic Vertebrates and Paleoenvironments: Tributes to the Career of Prof Dan Grigorescu. Ars Docendi, Bucharest, pp 57–77Google Scholar
  3. Berta A, Morgan GS (1985) A new sea otter (Carnivora: Mustelidae) from the late Miocene and early Pliocene (Hemphillian) of North America. J Paleontol 59: 809–819Google Scholar
  4. Boessenecker RW (2007) New records of fossil fur seals and walruses (Carnivora:Pinnipedia) from the late Neogene of northern California. J Vertebr Paleontol 27(Suppl to no 3): 50AGoogle Scholar
  5. Boessenecker RW (2011) New records of the fur seal Callorhinus (Carnivora: Otariidae) from the Plio-Pleistocene Rio Dell Formation of northern California and comments on otariid dental evolution. J Vertebr Paleontol 31(2): 454–467Google Scholar
  6. Boessenecker RW (2013a) A new marine vertebrate assemblage from the late Neogene Purisima Formation in central California, Part II: pinnipeds and cetaceans. Geodiversitas 35: 815–940Google Scholar
  7. Boessenecker RW (2013b) Pleistocene survival of an archaic dwarf baleen whale (Mysticeti: Cetotheriidae). Naturwissenschaften 100: 365–371Google Scholar
  8. Brigham-Grette J, Carter LD (1992) Pliocene marine transgressions of northern Alaska: circumarctic correlations and paleoclimatic interpretations. Arctic 45: 74–89CrossRefGoogle Scholar
  9. Brouwers EM (1994) Late Pliocene paleoecologic reconstructions based on ostracode assemblages from the Sagavanirktok and Gubik formations, Alaskan North Slope. Arctic 47: 16–33CrossRefGoogle Scholar
  10. Carter RM, Abbott ST, Graham IJ, Naish TR, Gammon PR (2002) The middle Pleistocene Merced-2 and -3 sequences from Ocean Beach, San Francisco. Sedimentary Geol 153: 23–41Google Scholar
  11. Clifton HE, Hunter RE (1991) Depositional and other features of the Merced Formation in sea cliff exposures south of San Francisco, California. California Division of Mines and Geology Special Publication 109: 35–44Google Scholar
  12. Dupré WR, Morrison RB, Clifton HE, Lajoie KR, Ponti DJ, Powell CL II, Mathieson SA, Sarna-Wojcicki AM, Leithold EL, Lettis WR, McDowell PF, Rockwell TK, Unruh JR, Yeats RS (1991) Quaternary geology of the Pacific margin. In: Morrison RB (ed) Quaternary Nonglacial Geology, Conterminous US. Geological Society of America, Boulder, Colorado, pp 141–213Google Scholar
  13. Estes JA (1980) Enhydra lutris. Mammal Species 133: 1–8CrossRefGoogle Scholar
  14. Estes JA, Palmisano JF (1974) Sea otters: their role in structuring nearshore communities. Science 185: 1058–1060CrossRefPubMedGoogle Scholar
  15. Estes JA, Steinberg PD (1988) Predation, herbivory, and kelp evolution. Paleobiology 14: 19–36CrossRefGoogle Scholar
  16. Glen W (1959) Pliocene and lower Pleistocene of the western part of the San Francisco Peninsula. Univ Calif Publ Geol Sci 36: 147–198Google Scholar
  17. Hall NT (1965) Late Cenozoic stratigraphy between Mussel rock and Fleishhacker Zoo, San Francisco Peninsula. In: Wahrhaftig C, Morrison RB, Birkeland PW (eds) INQUA International Association for Quaternary Research VIIth Congress, Guidebook for Field Conference I: Northern Great Basin and California. Nebraska Academy of Sciences, Lincoln pp 151–158Google Scholar
  18. Hall CA (2002) Nearshore marine paleoclimatic regions, increasing zoogeographic provinciality, molluscan extinctions, and paleoshorelines, California: late Oligocene (27 Ma) to late Pliocene (2.5 Ma). Geol Soc Am Spec Pap 357: 1–489Google Scholar
  19. Hilgen FJ, Lourens LJ, Van Dam JA, Beu AG, Boyes AF, Cooper RA, Krijgsman W, Ogg JG, Piller WE, Wilson DS (2012) The Neogene Period. In: Gradstein FM, Ogg JG, Schmitz M, Ogg G (eds) The Geologic Time Scale 2012. Elsevier, Amsterdam, pp 923–978CrossRefGoogle Scholar
  20. Hunter RE, Clifton HE, Hall NT, Császár G, Richmond BM, Chin JL (1984) Pliocene and Pleistocene coastal and shelf deposits of the Merced Formation and associated beds, northwestern San Francisco Peninsula, California. Soc Econ Paleontol Mineral Field Guidebook 3: 1–29Google Scholar
  21. Ingram BL, Ingle JC (1998) Strontium isotope ages of the marine Merced Formation, near San Francisco, California. Quaternary Res 50: 194–199CrossRefGoogle Scholar
  22. Jacobs DK, Haney TA, Louie KD (2004) Genes, diversity, and geologic process on the Pacific coast. Annu Rev Earth Planet Sci 32: 601–652Google Scholar
  23. Jefferson GT (1991) A catalogue of late Quaternary vertebrates from California: part two, mammals. Natural History Museum of Los Angeles County Technical Report 7: 1–129Google Scholar
  24. Kenyon KW (1969) The sea otter in the eastern Pacific Ocean. North Am Fauna 68:1–352CrossRefGoogle Scholar
  25. Kilmer FH (1972) A new species of sea otter from the late Pleistocene of northwestern California. Bull So Calif Acad Sci 71: 150–157Google Scholar
  26. King JE (1983) Seals of the World, 2nd edition. Cornell University Press, IthacaGoogle Scholar
  27. Kohno N, Tomida Y, Hasegawa Y, Furusawa H (1995) Pliocene tusked odobenids (Mammalia: Carnivora) in the western North Pacific, and their paleobiogeography. Bull Natl Sci Mus Tokyo Ser C (Geol & Paleontol) 21: 111–131Google Scholar
  28. Lambert WD (1997) The osteology and paleoecology of the giant otter Enhydritherium terraenovae. J Vertebr Paleontol 17(4): 738–749.CrossRefGoogle Scholar
  29. Lambert O (2008) A new porpoise (Cetacea, Odontoceti, Phocoenidae) from the Pliocene of the North Sea. J Vertebr Paleontol 28(3): 863–872CrossRefGoogle Scholar
  30. Leffler SR (1964) Fossil mammals from the Elk River Formation, Cape Blanco, Oregon. J Mammal 45: 53–61.Google Scholar
  31. Lewis ME (2008) The femur of extinct bunodont otters in Africa (Carnivora, Mustelidae, Lutrinae). C R Palevol 7:607--627Google Scholar
  32. Lucas SG (1995) The Thornton Beach mammoth and the antiquity of Mammuthus in North America. Quaternary Res 43: 263–264CrossRefGoogle Scholar
  33. Marincovich L (2000) Central American paleogeography controlled Pliocene Arctic Ocean molluscan migrations. Geology 28: 551–554CrossRefGoogle Scholar
  34. Meyer CE, Sarna-Wojcicki AM, Hillhouse JW, Woodward MJ, Slate JL, Sorg DH (1991) Fission-track age (400,00 yr) of the Rockland Tephra, based upon inclusion of zircon grains lacking fossil fission tracks. Quaternary Res 35: 367–382CrossRefGoogle Scholar
  35. Miller WE (1971) Pleistocene vertebrates of the Los Angeles Basin and vicinity (exclusive of Rancho La Brea). Bull Los Angeles Co Mus Nat Hist Sci 10: 1–124Google Scholar
  36. Mitchell ED (1966) Northeastern Pacific Pleistocene sea otters. J Fisheries Res Board Canada 23: 1897–1911CrossRefGoogle Scholar
  37. Newton ET (1890) On some new mammals from the Red and Norwich crags. Quart J Geol Soc 46: 444–453CrossRefGoogle Scholar
  38. Ogg JG, Ogg G, Gradstein FM (2016) A Concise Geologic Time Scale. Elsevier, AmsterdamGoogle Scholar
  39. Orr PC (1960) Late Pleistocene marine terraces on Santa Rosa Island, California. Geol Soc Amer Bull 71:1113--1120Google Scholar
  40. Powell CL II, Grant LB, Conkling SW (2004) Paleoecologic analysis and age of a late Pleistocene fossil assemblage at a locality in Newport Beach, upper Newport Bay, Orange County, California. Veliger 47:171--180Google Scholar
  41. Powell CL II, Ponti DJ (2007) Paleontologic and stratigraphic reevaluation of Deadman Island, formerly in San Pedro Bay. US Geol Surv Prof Pap 207:101--120Google Scholar
  42. Repenning CA (1976) Enhydra and Enhydriodon from the Pacific coast of North America. J Res US Geol Survey 4: 305–315Google Scholar
  43. Repenning CA (1983) New evidence for the age of the Gubik Formation, Alaskan North Slope. Quaternary Res 19: 356–372CrossRefGoogle Scholar
  44. Roth B (1979) Late Cenozoic marine invertebrates from northwest California and southwest Oregon. Dissertation, University of CaliforniaGoogle Scholar
  45. Sarna-Wojcicki AM (2000) Revised age of the Rockland tephra, northern California: implications for climate and stratigraphic reconstructions in the western United States: comment and reply. Geology 28: 286CrossRefGoogle Scholar
  46. Tarasoff FJ (1972) Comparative aspects of the hindlimbs of the river otter, sea otter and seals. In: Harrison RJ (ed) Functional Anatomy of Marine Mammals. Academic Press, London, pp 333–359Google Scholar
  47. Taylor WP (1914) The problem of aquatic adaptation in Carnivora, as illustrated in the osteology and evolution of the sea otter. Bull Dept Geol Sci Univ Calif 7:465–495Google Scholar
  48. Thenius E, Hofer H (1960) Stammesgeshichte der Säugetiere. Springer, BerlinCrossRefGoogle Scholar
  49. Tsai C-H, Boessenecker RW (2015) An early Pleistocene gray whale (Cetacea: Eschrichtiidae) from the Rio Dell Formation of northern California. J Paleontol 89: 103–109.CrossRefGoogle Scholar
  50. Wehmiller JF, Sarna-Wojcicki AM, Belknap DF, Kennedy GL, Stephens TA, Kohn RF (1978) Amino acid racemization dating of Quaternary mollusks, Pacific coast United States. US Geol Survey Open-file Report 78–701: 445–448Google Scholar
  51. Westerhoff W (2009) Stratigraphy and sedimentary evolution. The lower Rhine-Meuse system during the late Pliocene and early Pleistocene (southern North Sea Basin). Dissertation, Vrije Univesiteit, AmsterdamGoogle Scholar
  52. Willemsen GF (1990) A new specimen of the otter Enhydra reevei (Newton, 1890) from the Crag of Bramerton, Norfolk. Bull Geol Soc Norfolk 39: 87–90Google Scholar
  53. Willemsen GF (1992) A revision of the Pliocene and Quaternary Lutrinae from Europe. Scripta Geologica 101: 1–115Google Scholar
  54. Wolff RG (1973) Hydrodynamic sorting and ecology of a Pleistocene mammalian assemblage from California (U.S.A.). Palaeogeogr Palaeoclimatol Palaeoecol 13: 91–101Google Scholar

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Geology and Environmental GeosciencesCollege of CharlestonCharlestonUSA
  2. 2.Museum of PaleontologyUniversity of CaliforniaBerkeleyUSA

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