A baseline paleoecological study for the Santa Cruz Formation (late-early Miocene) at the Atlantic Coast of Patagonia, Argentina

Sergio F. Vizcaíno, M. Susana Bargo, Richard F. Kay, Richard A. Fariña, Mariana Di Giacomo, Jonathan M G Perry, Francisco J. Prevosti, Néstor Toledo, Guillermo H. Cassini, Juan C. Fernicola

Research output: Contribution to journalArticle

Abstract

Coastal exposures of the Santa Cruz Formation (late-early Miocene, southern Patagonia, Argentina) between the Coyle and Gallegos rivers have been a fertile ground for recovery of Miocene vertebrates for more than 100 years. The formation contains an exceptionally rich mammal fauna, which documents a vertebrate assemblage very different from any living community, even at the ordinal level. Intensive fieldwork performed since 2003 (nearly 1200 specimens have been collected, including marsupials, xenarthrans, notoungulates, litopterns astrapotheres, rodents, and primates) document this assertion. The goal of this study is to attempt to reconstruct the trophic structure of the Santacrucian mammalian community with precise stratigraphic control. Particularly, we evaluate the depauperate carnivoran paleoguild and identify new working hypotheses about this community. A database has been built from about 390 specimens from two localities: Campo Barranca (CB) and Puesto Estancia La Costa (PLC). All species have been classified as herbivore or carnivore, their body masses estimated, and the following parameters estimated: population density, on-crop biomass, metabolic rates, and the primary and secondary productivity. According to our results, this model predicts an imbalance in both CB and PLC faunas which can be seen by comparing the secondary productivity of the ecosystem and the energetic requirements of the carnivores in it. While in CB, the difference between carnivores and herbivores is six-fold, in PLC this difference is smaller, the secondary productivity is still around three times that of the carnivore to herbivore ratio seen today. If both localities are combined, the difference rises to around four-fold in favour of secondary productivity. Finally, several working hypotheses about the Santacrucian mammalian community and the main lineages of herbivores and carnivores are offered.

Original languageEnglish (US)
Pages (from-to)507-519
Number of pages13
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume292
Issue number3-4
DOIs
StatePublished - 2010
Externally publishedYes

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carnivore
carnivores
secondary productivity
Argentina
Miocene
herbivore
coasts
herbivores
coast
productivity
vertebrate
vertebrates
fauna
fold
trophic structure
marsupial
Metatheria
primate
body mass
rodent

Keywords

  • Basal metabolism
  • Carnivore guild
  • Herbivore guild
  • Paleoecology
  • Population density
  • Vertebrate paleontology

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology
  • Earth-Surface Processes
  • Oceanography

Cite this

A baseline paleoecological study for the Santa Cruz Formation (late-early Miocene) at the Atlantic Coast of Patagonia, Argentina. / Vizcaíno, Sergio F.; Bargo, M. Susana; Kay, Richard F.; Fariña, Richard A.; Di Giacomo, Mariana; Perry, Jonathan M G; Prevosti, Francisco J.; Toledo, Néstor; Cassini, Guillermo H.; Fernicola, Juan C.

In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 292, No. 3-4, 2010, p. 507-519.

Research output: Contribution to journalArticle

Vizcaíno, SF, Bargo, MS, Kay, RF, Fariña, RA, Di Giacomo, M, Perry, JMG, Prevosti, FJ, Toledo, N, Cassini, GH & Fernicola, JC 2010, 'A baseline paleoecological study for the Santa Cruz Formation (late-early Miocene) at the Atlantic Coast of Patagonia, Argentina', Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 292, no. 3-4, pp. 507-519. https://doi.org/10.1016/j.palaeo.2010.04.022
Vizcaíno, Sergio F. ; Bargo, M. Susana ; Kay, Richard F. ; Fariña, Richard A. ; Di Giacomo, Mariana ; Perry, Jonathan M G ; Prevosti, Francisco J. ; Toledo, Néstor ; Cassini, Guillermo H. ; Fernicola, Juan C. / A baseline paleoecological study for the Santa Cruz Formation (late-early Miocene) at the Atlantic Coast of Patagonia, Argentina. In: Palaeogeography, Palaeoclimatology, Palaeoecology. 2010 ; Vol. 292, No. 3-4. pp. 507-519.
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