A new<i>Cormohipparion</i>(Mammalia, Equidae) from the Pliocene (latest Hemphillian and Blancan) of Florida

Hulbert, Richard C.

doi:10.1080/02724634.1988.10011675

Cited by 27 publications

(18 citation statements)

References 22 publications

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“…Age estimates based on strontium-isotope ratios further constrain the antiquity of the bone beds at Leisey. On this basis the most probable dates for the bone (Morgan and Ridgway, 1987;Hulbert, 1988) and Santa Fe River 1 (Webb, 1974;Morgan and Ridgway, 1987). See text for further discussion.…”

Section: Discussionmentioning

confidence: 99%

Geochronology of a Rich Early Pleistocene Vertebrate Fauna, Leisey Shell Pit, Tampa Bay, Florida

et al. 1989

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Leisey Shell Pit, on the southeastern edge of Tampa Bay, has produced the largest early Pleistocene vertebrate fauna in North America, consisting of about 30,000 cataloged specimens. The predominantly terrestrial and freshwater vertebrate fauna was transported into an estuarine environment during a regressive phase in an otherwise marine, bay-bottom sequence of sandy shell beds. The biochronological age of the Leisey Shell Pit local fauna is late Sappan (or late early Irvingtonian) based on the presence of such mammalian species as Mammuthus meridionalis and Smilodon gracilis, the absence of any Blancan holdovers, and early records of Lutra, Nothrotheriops, Palaeolama, and a new small glyptodont. Magnetostratigraphy indicates that the entire Pleistocene section at Leisey is reversed and thus presumably accumulated in the post-Olduvai part of the Matuyama Magnetochron (i.e., 1.66 myr or younger). Strontium isotope ratios (87Sr/86Sr) sampled from aragonitic bivalve shells (Chione cancellata) trend higher with increasing height in the section, yielding a mean age estimate for the two major bone beds of 1.7 ± 0.35 myr. In combination, these three geochronologic methods provide a high-resolution approach toward age determination and delimit the age of Leisey Shell Pit local fauna as between 1.66 and 1.4 myr.

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Section: Discussionmentioning

confidence: 99%

Geochronology of a Rich Early Pleistocene Vertebrate Fauna, Leisey Shell Pit, Tampa Bay, Florida

et al. 1989

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“…By contrast, the range within each individual specimen is low (typically less than 3‰; figure 3). For example, the total species range of the mixed-feeder Cormohipparion emsliei from the early Pliocene (Florida, USA [30,31]) is 13.4‰, while individuals have an average δ 13 C enamel range of 1.1‰ (standard deviation, s.d. 0.5‰, n = 9; figure 2), and all individuals vary by ≤ 2‰.…”

Section: Resultsmentioning

confidence: 99%

Global long-term stability of individual dietary specialization in herbivorous mammals

DeSantis

Pardi

et al. 2022

Proc. R. Soc. B.

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Dietary variation within species has important ecological and evolutionary implications. While theoreticians have debated the consequences of trait variance (including dietary specialization), empirical studies have yet to examine intraspecific dietary variability across the globe and through time. Here, we use new and published serial sampled δ 13 C enamel values of herbivorous mammals from the Miocene to the present (318 individuals summarized, 4134 samples) to examine how dietary strategy (i.e. browser, mixed-feeder, grazer) affects individual isotopic variation. We find that almost all herbivores, regardless of dietary strategy, are composed of individual specialists. For example, Cormohipparion emsliei (Equidae) from the Pliocene of Florida (approx. 5 Ma) exhibits a δ 13 C enamel range of 13.4‰, but all individuals sampled have δ 13 C enamel ranges of less than or equal to 2‰ (mean = 1.1‰). Most notably, this pattern holds globally and through time, with almost all herbivorous mammal individuals exhibiting narrow δ 13 C enamel ranges (less than or equal to 3‰), demonstrating that individuals are specialized and less representative of their overall species' dietary breadth. Individual specialization probably reduces intraspecific competition, increases carrying capacities, and may have stabilizing effects on species and communities over time. Individual specialization among species with both narrow and broad dietary niches is common over space and time—a phenomenon not previously well recognized or documented empirically.

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“…SPECIAL PUBLICATION NO. 36 The age of Unit 4 in the Pinecrest Beds at APAC Shell Pit has been placed in the latest Pliocene (Blancan, 2.2-2.5 Ma; see Hulbert, 1987). This age is based on the co-occurrence of South American mammalian taxa (Giyptotherium, Neochoerus.…”

Section: Discussionmentioning

confidence: 99%

Plio-Pleistocene Stratigraphy and Paleontology of Southern Florida

1992

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A newCormohipparion(Mammalia, Equidae) from the Pliocene (latest Hemphillian and Blancan) of Florida

Cited by 27 publications

References 22 publications

Geochronology of a Rich Early Pleistocene Vertebrate Fauna, Leisey Shell Pit, Tampa Bay, Florida

Geochronology of a Rich Early Pleistocene Vertebrate Fauna, Leisey Shell Pit, Tampa Bay, Florida

Global long-term stability of individual dietary specialization in herbivorous mammals

Plio-Pleistocene Stratigraphy and Paleontology of Southern Florida

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