CONCEPTUAL CHALLENGES FOR THE PALEOECOLOGICAL RECONSTRUCTION OF THE PLEISTOCENE PAMPEAN MEGAFAUNA AND THE CONSEQUENCES OF ITS EXTINCTION
DOI:
https://doi.org/10.5710/PEAPA.11.07.2022.403Keywords:
Quaternary, Pampean Region, Mammals, Actualism, Paleobiology, MetabolismAbstract
The Pleistocene Pampean Megafauna (PPM) may be considered as the assemblage consisting mainly of large mammals (i.e., bodymass ≥ 45 kg) that inhabited what is currently considered the Pampean Region during the Pleistocene and became extinct near the Pleistocene–Holocene transition. This contribution addresses several conceptual issues that may guide future efforts in its reconstruction and to consider potential consequences of its extinction. First, we approach the concept of megafauna by urging its explicit definition and contextualization in every investigation as a means of avoiding conceptual ambiguity. Second, we call attention to the risks of succumbing too readily to the temptation of employing a simplistic approach that assumes that extinct taxa had virtually the same biological requirements as those of their extant counterparts. We claim that within the PPM the abundance of taxa distantly related to or markedly distinct morphologically from their living counterparts poses significant challenges for understanding their paleobiology. Paleobiological interpretations need not be rigidly phylogenetically restricted, and phylogenetically based interpretations require critical assessment before their application. Third, we consider the paleoecology of the PPM from a metabolic perspective: as it was clearly dominated by allegedly hypometabolic megaherbivores (xenarthrans), there is no clear counterpart among living faunas. Fourth, we call attention to the fact that the loss of the PPM may have left in its wake an enduring but little-recognized legacy on the functioning of the contemporary ecosystem of the Pampean Region. Extinction of the PPM opened an enormous ecological chasm in the herbivore guild during the Holocene that persisted for about 6000 years, until it was filled, at least in part, by herds of cattle introduced since the sixteenth century.
References
Araújo, T., Machado, H., Mothé, D., & Dos Santos Avilla, L. (2021). Species distribution modeling reveals the ecological niche of extinct megafauna from South America. Quaternary Research, 104: 151–158.
Bargo, M. S. (2001). The ground sloth Megatherium americanum: skull shape, bite forces, and diet. Acta Paleontologica Polonica, 46(2), 41–60.
Barnosky, A. D., Lindsey, E. L., Villavicencio, N., Bostelmann, E., Hadly, E. A., Wanket, J. & Marshall, Ch. R. (2016). Variable impact of late-Quaternary megafaunal extinction in causing ecological state shifts in North and South America. Proceedings of the National Academy of Sciences, 113(4), 856–861.
Brown, J. H., Gillooly, J. F., Allen, A. P., Savage, V. M. & West, G. B. (2004). Toward a metabolic theory of ecology. Ecology, 85, 1771–1789.
Christiansen, P. & Harris, M. (2005). Body size of Smilodon (Mammalia: Felidae). Journal of Morphology, 266(3), 369–384.
Cione A. L. & Tonni, E. P. (1999), Biostratigraphy and chronological scale of uppermost Cenozoic in the Pampean area, Argentina. In E.P. Tonni & A.L. Cione (Eds.), Quaternary Vertebrate Paleontology in South America. Quaternary of South America and Antarctic Peninsula, 12, 23–51.
Cione, A. L., Tonni, E. P. & Soibelzon, L. H. (2003). The Broken Zig-Zag: late Cenozoic large mammals and turtle extinction in South America. Revista del Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, 5, 1–19.
Cione, A. L., Tonni, E. P. & Soibelzon, L. H. (2009). Did Humans cause large mammal late Pleistocene-Holocene extinction in South America in a context of shrinking open areas? In Haynes, G. (Ed.), American Megafaunal Extinctions at the end of the Pleistocene (pp. 125–144). Springer Publishers, Vertebrate Paleobiology and Paleontology Series.
Cione, A. L., Tonni, E. P. & Soibelzon, L. H. (2011). Mammal Extinction at the Pleistocene-Holocene Boundary in South America. Current Research in the Pleistocene, 28, 152–154.
Currie, A. (2013). Convergence as Evidence. British Journal for the Philosophy of Science, 64: 763–786.
Currie, A. (2015). Marsupial lions and methodological omnivory: function, success and reconstruction in paleobiology. Biology and Philosophy 30, 187–209.
Cuvier, G. (1796). Notice sur de squelette d’un très grande espèce de quadrupède inconnue jusqu’á présent, trouvé au Paraguay, et déposé au Cabinet d’Histoire Naturelle de Madrid. Magasin encyclopédique, ou Journal des Sciences, des Lettres et des Arts 2(3), 440–445.
Darwin, C. (1845). Journal of Researches into the Natural History and Geology of the Countries Visited during the Voyage of H.M.S. Beagle round the World, under the Command of Capt. Fitz Roy, R.N. 2nd Edition. London: John Murray.
Darwin, C. (1859). On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. London: John Murray.
Desbiez, A. L. J. & Kluyber, D. (2013). The role of giant armadillos (Priodontes maximus) as physical ecosystem engineers. Biotropica, 45(5): 537–540.
Doughty, Ch. E., Faurby S. & Svenning, J. (2016). The impact of the megafauna extinctions on savanna woody cover in South America. Ecography, 39: 213–222.
Fariña, R. A. (1996). Trophic relationships among Lujanian mammals. Evolutionary Theory, 11, 125–134.
Fariña, R. A. (2002). Megatherium, el pelado: sobre la apariencia de los grandes perezosos (Mammalia; Xenarthra) cuaternarios. Ameghiniana, 39(2): 241–244.
Fariña, R. A., Vizcaíno, S. F. & Bargo, M. S. (1998). Body mass estimations in Lujanian (Late Pleistocene-Early Holocene of South America) mammal megafauna. Mastozoología Neotropical, 5, 87–108.
Fariña, R. A., Vizcaíno, S. F. & De Iuliis, G. (2013). Megafauna. Giant beasts of Pleistocene South America. Indiana University Press, Indiana.
Fariña, R. A., Czerwonogora, A. & Di Giacomo, M. (2014). Splendid oddness: revisiting the curious trophic relationships of South American Pleistocene mammals. Anais da Academia Brasileira de Ciências, 86(1), 311-331.
Grayson, D. L. (2015). Giant Sloths and Sabertooth Cats. Extinct Mammals and the Archaeology of the Ice Age Great Basin. The University of Utah Press.
Humphries, M. M. & McCann, K. S. (2014). Metabolic ecology. Journal of Animal Ecology, 83(1), 7–19.
Johnson, C. N. (2009). Ecological Consequences of Late Quaternary Extinctions of Megafauna.
Proceedings of the Royal Society of London, B, Biological Sciences, 276, 2509–2519.
Karp, A. T., Faith, J. T., Marlon, J. R., & Staver, A. C. (2021). Global response of fire activity to late Quaternary grazer extinctions. Science, 374(6571): 1145–1148.
Lessa, E. P. & Fariña, R. A. (1996). Reassessment of extinction patterns among the late Pleistocene mammals of South America. Palaeontology, 39(3), 651–662.
Lessa, E. P., Van Valkenburgh, B. & Fariña, R. A. (1997). Testing hypotheses of differential mammalian extinctions subsequent to the Great American Biotic Interchange. Palaeogeography, Palaeoclimatology, Palaeoecology, 135, 157–162.
Malhi, Y., Doughty, Ch. E., Galetti, M., Smith, F. A., Svenning, J. & Terborgh, J. W. (2016). Megafauna and ecosystem function from the Pleistocene to the Anthropocene. Proceedings of the National Academy of Sciences, 113(4), 838–846.
Marshall, L., Berta, A., Hoffstetter, R., Pascual, R., Reig, O., Bombin, M. & Mones, A. (1984). Mammals and stratigraphy: geochronology of the continental mammal-bearing Quaternary of South America. Paleovertebrata, Mém. Extr., 1–76.
Martin, P. S. (1967). Prehistoric overkill. In Martin, P. S. & Wright, H. E. (Eds.), Pleistocene extinctions: the search for a cause (pp. 75–120). New Haven, CT: Yale University Press.
McGill, B. J., Enquist, B. J., Weiher, E. & Westoby, M. (2006). Rebuilding community ecology from functional traits. TRENDS in Ecology and Evolution, 21, 178–185.
McNab, B. K. (1985). Energetics, population biology, and distribution of xenarthrans, living and extinct. In Montgomery, G. G. (Ed), The Evolution and Ecology of Armadillos, Sloths and Vermilinguas (pp. 219–232). Smithsonian Institution.
Nieto Díaz, M., & Rodríguez, J. (2003). Inferencia paleoecológica en mamíferos cenozoicos: limitaciones metodológicas. Coloquios de Paleontología, 1: 459–474.
Moleón, M., Sánchez-Zapata, J. A., Donázar, J. A., Revilla, E., Martín-López, B., Gutiérrez-Cánovas, C., Getz, W. M., Morales-Reyes, Z., Campos-Arceiz, A., Crowder, L. B., Galetti, M., González-Suárez, M., He, F., Jordano, P., Lewison, R., Naidoo, R., Owen-Smith, N., Selva, N., Svenning, J., Tella, J. L., Zarfl, C., Jähnig, S. C., Hayward, M. W., Faurby, S., García, N., Barnosky, A. D. & Tockner, K. (2020). Rethinking megafauna. Proceedings of the Royal Society B, 287, 20192643.
Owen-Smith, R. N. (1988). Megaherbivores. The influence of very large body size on ecology. New York: Cambridge University Press.
Owen-Smith, R. N. (2013). Megaherbivores. In Levin, S.A (Ed.), Encyclopedia of biodiversity, 5, 223–239. Waltham, MA: Academic Press.
Paine, R. T. (1969). A note on trophic complexity and community stability. The American Naturalist, 103, 91–93.
Prado, J. L., Martinez-Maza, C. & Alberdi, M. T. (2015) Megafauna extinction in South America: A new chronology for the Argentine Pampas. Palaeogeography, Palaeoclimatology, Palaeoecology, 425, 41–49.
Prado, J. L., Alberdi, M. T. & Bellinzoni, J. (2021). Pleistocene Mammals from Pampean Region Argentina). Biostratigraphic, biogeographic, and environmental implications. Quaternary, 4, 15. https://doi.org/10.3390/quat4020015
Prates, L. & Perez, S. I. (2021). Late Pleistocene South American megafaunal extinctions associated with rise of fishtail points and human population. Nature Communications, 12, 2175.
Prevosti, F. J. & Vizcaíno, S. F. (2006). The large carnivore guild of the Lujanian (Late Pleistocene) in the Pampean Region (Argentina): paleoautecology, paleosynecology, and carnivore richness and density. Acta Paleontologica Polonica, 51(3), 407–422.
Radinsky, L. B. (1987). The Evolution of Vertebrate Design. University of Chicago Press, Chicago and London.
Ramos, M., Lanza, M., Bognann, F. & Helfer. V. (2008). Implicancias Arqueológicas respecto del ganado introducido y el tráfico de los cimarrones. Tefros, 6, 1–24.
Rudwick, M. J. S. (1964). The inference of function from structure in fossils. The British Journal for the Philosophy of Science, 15(57), 27–40.
Swift, J. A., Bunce, M., Dortch, J., Douglass K., Faith, J. T., Fellows Yates, J.A., Field, J., Haberle, S.G., Jacob, E., Johnson, C.N., Lindsey, E., Lorenzen, E.D., Louys, J., Miller, G., Mychajliw, A.M., Slon, V., Villavicencio, N.A., Waters, M.R., Welker, F., Wood, R., Petraglia, M., Boivin, N., & Roberts, P. (2019). Micro Methods for Megafauna: Novel Approaches to Late Quaternary Extinctions and Their Contributions to Faunal Conservation in the Anthropocene. BioScience, 69(11), 877–887.
Tejada, J. V., Flynn, J. J., MacPhee, R., O’Connell, T. C., Cerling, T. E., Bermudez, L., Capuñay, C., Wallsgrove, N., & Popp, B. N. (2021). Isotope data from amino acids indicate Darwin’s ground sloth was not an herbivore. Scientific Reports, 11, 18944.
Tonni, E. P. (2011). Ameghino y la estratigrafía pampeana un siglo después. Publicación Electrónica de la Asociación Paleontológica Argentina, 12(1), 69-79.
Tonni, E. P., Alberdi, M. T., Prado, J. L., Bargo, M. S. & Cione, A. L. (1992). Changes of mammal assemblages in the Pampean Region (Argentina) and their relation with the Plio-Pleistocene boundary. Palaeogeography, Palaeoclimatology, Palaeoecology, 95(3–4), 179–194.
Tonni, E. P. & Cione, A. L. (1995). Los mamíferos como indicadores de cambios climáticos en el Cuaternario de la región pampeana de la Argentina. In Argollo J. & Mouguiart, P. (Eds.), Los Climas Cuaternarios en América del Sur (pp. 319–326), Orstom, La Paz.
Tonni, E. P. & Cione, A. L. (1997). Did the Argentine Pampean ecosystem exist in the Pleistocene. Current research in the Pleistocene, 14, 131-133.
Tonni, E. P., Cione, A. L. & Figini, A. J. (1999). Predominance of arid climates indicated by mammals in the pampas of Argentina during the Late Pleistocene and Holocene. Palaeogeography, Palaeoclimatology, Palaeoecology, 147(3-4), 257–281.
Tonni, E. P. & Fidalgo, F. (1978). Consideraciones sobre los cambios climáticos durante el Pleistoceno tardío-reciente en la provincia de Buenos Aires. Aspectos ecológicos y zoogeográficos relacionados. Ameghiniana, 15(1-2), 235–253.
Tonni, E. P. & Fidalgo, F. (1982). Geología y paleontología de los sedimentos del Pleistoceno en el área de Punta Hermengo (Miramar, provincia de Buenos Aires, Rep. Argentina): aspectos paleoclimáticos. Ameghiniana, 19(1-2), 79–108.
Tonni, E. P., Huarte, R. A., Carbonari, J. E. & Figini, A. J. (2003). New radiocarbon chronology for the Guerrero Member of the Luján Formation (Buenos Aires, Argentina): Palaeoclimatic significance. Quaternary International, 109(1): 45–48.
Tonni, E. P., Prado, J. L., Menegaz, A. N. & Salemme, M. C. (1985). La unidad mamífero (fauna) Lujanense. Proyección de la estratigrafia mamaliana al Cuaternario de la Región Pampeana Ameghiniana, 22(3–4), 255–261.
Varela, L., Tambusso, P. S., Patiño, S. J., Di Giacomo, M. & Fariña, R. A. (2018). Potential Distribution of Fossil Xenarthrans in South America during the Late Pleistocene: co-Occurrence and Provincialism. Journal of Mammalian Evolution, 25, 539–550.
Vizcaíno, S. F. (2014). Interview on Paleobiology. In Sánchez-Villagra, M. R. & MacLeod, N. (Eds.), Issues in Palaeontology: A Global View. Interviews and Essays (Pp. 181–192). Scidinge Hall Verlag, Zürich.
Vizcaíno, S. F. & Bargo M. S. (2021). Views on the Form-Function Correlation and Biological Design. Journal of Mammalian Evolution, 28, 15–22.
Vizcaíno, S. F., Fariña, R. A. & Fernicola, J. C. (2009). Young Darwin and the ecology of South American fossil mammals. Revista de la Asociación Geológica Argentina, 64(1), 160–169.
Vizcaíno S. F., Cassini, G. H., Toledo, N., & Bargo, M. S. (2012). On the evolution of large size in mammalian herbivores of Cenozoic faunas of southern South America. In Patterson, B. & Costa, L. (Eds.), Bones, clones and biomes: an 80-million year history of Recent Neotropical mammals (pp. 76–101). The University of Chicago Press, Chicago.
Vizcaíno, S. F., Bargo, M. S., Cassini, G. H., & Toledo, N. (2016). Forma y función en paleobiología de vertebrados. Editorial Universidad Nacional de La Plata (Edulp).
Vizcaíno, S. F., Bargo, M. S., & Toledo, N. (2017). Revaluación crítica de los mamíferos actuales como indicadores paleoambientales. Ejemplos de la mastofauna neotropical. XXX Jornadas Argentinas de Mastozoología, Abstract book: pp 41.
Vizcaíno, S. F., Toledo, N. & Bargo, M. S. (2018). Advantages and limitations in the use of extant xenarthrans (Mammalia) as morphological models for paleobiological reconstruction. Journal of Mammalian Evolution, 25, 495–505.
Vizcaíno, S. F., Zárate, M. Bargo M. S. & Dondas A. 2001. Pleistocene burrows in the Mar del Plata area (Buenos Aires Province, Argentina) and their probable builders. Acta Paleontologica Polonica, 46, 157–169.
Wallach, A. D, Izhaki, I., Toms, J. D, Ripple, W. J. & Shanas, U. (2015). What is an apex predator? Oikos, 124, 1453–1461.
Woodward, G., Ebenman, B., Emmerson, M., Montoya, J. M., Olesen, J. M., Valido, A., Warren, P. H. (2005). Body size in ecological networks. TRENDS in Ecology and Evolution, 20, 402–409.
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