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The parasite connection in ecosystems and macroevolution.

Adolf Seilacher1, Wolf-Ernst Reif, Peter Wenk

  • 1Geology Department Yale University, POB 208109, New Heaven, CT 06520, USA. geodolf@tuebingen.netsurf.de

Die Naturwissenschaften
|November 18, 2006
PubMed
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Endoparasites, including pathogens, are crucial for maintaining ecosystem stability by regulating host populations. Shifting focus to parasite perspectives reveals their integral role in ecosystem dynamics and long-term stability.

Area of Science:

  • Ecology
  • Parasitology
  • Evolutionary Biology

Background:

  • Endoparasites significantly influence animal community structure and function.
  • Traditionally viewed negatively as pathogens, parasites are now recognized for their broader ecological roles.

Purpose of the Study:

  • To re-evaluate the role of endoparasites in ecosystems from a parasite-centric viewpoint.
  • To understand how parasites, including non-pathogenic ones, modulate host populations and ecosystem stability.

Main Methods:

  • Ecological analysis of host-parasite interactions.
  • Examination of parasite influence on population dynamics and predator-prey relationships.
  • Consideration of parasite networks in the context of ecosystem stasis and macroevolution.

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Main Results:

  • Parasites, including "balance strategists," modulate host population densities.
  • Heteroxenic parasites regulate predator-prey balances, especially with vertebrate hosts, strengthening ecosystem bonds.
  • Parasite networks, due to their inflexibility, may explain ecosystem stasis over geological time despite evolutionary innovation.

Conclusions:

  • Parasites are indispensable components of ecosystems, essential for maintaining stability and status quo.
  • Parasite-host interactions provide a framework for understanding ecosystem resilience and long-term stability.
  • The influence of parasites may extend to macroevolutionary processes, potentially acting as units of selection.