Evolution of Ecosystems: Terrestrial

Abstract

As life has evolved on Earth, it has been organised into biological communities of increasing complexity. The earliest evidence of true terrestrial ecosystems comes from the Ordovician Period, about 460 million years ago. During the Paleozoic, terrestrial animal life progressed from the earliest arthropods and tetrapod vertebrates through many of the modern invertebrate orders, amphibians and reptiles. The extinction event at the end of the Permian allowed new groups of plants and animals to dominate, including gymnosperms and dinosaurs. The mass extinction at the end of the Cretaceous likewise allowed angiosperms and mammals to come to dominance in the Cenozoic. From an ecological perspective, perhaps the most significant evolutionary event during the Quaternary Period was the rise of our own species, Homo sapiens, as we have reshaped the biotic world during the time since the last glaciation. The fossil evidence clearly shows that biological communities are temporary associations of species that shift in response to environmental disturbances.

Key Concepts:

  • The history of life on Earth has been punctuated by a series of mass extinctions that have ended the prominence of more primitive groups and given new groups the opportunity to flourish.

  • Biological communities are temporary associations of species that shift in response to environmental disturbances.

  • The important time scales of ecological change are centuries and millennia: intervals too long to be observed by one generation of scientists.

  • Biodiversity adds to the stability of ecosystems.

Keywords: evolution; terrestrial ecosystem; Palaeozoic era; Mesozoic era; Cenozoic era ecosystem stability

Figure 1.

Summary of geological time, showing the major events in ecosystem evolution on land.

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References

Banks HP (1972) The stratigraphic occurrence of early land plants. Palaeontology 15: 365–377.

Deruiter PC, Neutel AM and Moore JC (1995) Energetics, patterns of interaction strengths, and stability in real ecosystems. Science 269: 1257–1260.

Dressler BO and Sharpton VL (1999) Large meteorite impacts and planetary evolution. Geological Society of America, Special Paper 339: 464.

Erwin DH (1993) The Great Palaeozoic Crisis. The Critical Moments and Perspectives in Paleobiology and Earth History Series. New York: Columbia University Press. p. 327.

Haydon DT (2000) Maximally stable model ecosystems can be highly connected. Ecology 81: 2631–2636.

Johnson HB and Mayeux HS (1992) Viewpoint – a view on species additions and deletions and the balance of nature. Journal of Range Management 45: 322–333.

Kaufman JH, Brodbeck D and Melroy OR (1998) Critical biodiversity. Conservation Biology 12: 521–532.

Loreau M and Behera N (1999) Phenotypic diversity and stability of ecosystem processes. Theoretical Population Biology 56: 29–47.

MacDonald J (1994) Earth's First Steps: Tracking Life Before the Dinosaurs. Boulder, Colorado: Johnson Books. p. 281.

Moullade M and Nairn AEM (1991) The Palaeozoic. Amsterdam: Elsevier. p. 430.

Redecker D, Kodner R and Graham LE (2000) Glomalean fungi from the Ordovician. Science 289: 1920–1921.

Rye R and Holland HD (2000) Life associated with a 2.76 Ga ephemeral pond? Evidence from Mount Roe #2 paleosol. Geology 28: 483–486.

Sennikov AG (1996) Evolution of the Permian and Triassic tetrapod communities of Eastern Europe. Palaeogeography, Palaeoclimatology, Palaeoecology 120: 331–351.

Tilman D (1996) Biodiversity: population versus ecosystem stability. Ecology 77: 350–363.

Yachi S and Loreau M (1999) Biodiversity and ecosystem productivity in a fluctuating environment: the insurance hypothesis. Proceedings of the National Academy of Sciences of the USA 96: 1463–1468.

Further Reading

Beerbower R (1985) Early development of continental ecosystems. In: Tiffney BH (ed.) Geological Factors and the Evolution of Plants, pp. 47–91. New Haven, CT: Yale University Press.

Kenrick P and Crane PR (1997) The origin and early evolution of plants on land. Nature 389: 33–39.

Matthews JV (1974) Quaternary environments at Cape Deceit (Seward Peninsula, Alaska): evolution of a tundra ecosystem. Geological Society of America Bulletin 85: 1353–1384.

Shear WA (1991) The early development of terrestrial ecosystems. Nature 351: 283–289.

Tschudy RH, Pilmore CL, Orth CJ, Gilmore JS and Knight T (1984) Disruption of the terrestrial plant ecosystems at the Cretaceous–Tertiary boundary, western interior. Science 225: 1030–1032.

Vitousek PM, Mooney HA, Lubchenco J and Melillo JM (1997) Human domination of Earth's ecosystems. Science 277: 494–499.

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How to Cite close
Elias, Scott A(May 2010) Evolution of Ecosystems: Terrestrial. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1002/9780470015902.a0003471.pub2]