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All wet or dried up? Real differences between aquatic and terrestrial food webs

Jonathan B Shurin, Daniel S Gruner, Helmut Hillebrand
Published 7 January 2006.DOI: 10.1098/rspb.2005.3377
Jonathan B Shurin
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Daniel S Gruner
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Helmut Hillebrand
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Abstract

Ecologists have greatly advanced our understanding of the processes that regulate trophic structure and dynamics in ecosystems. However, the causes of systematic variation among ecosystems remain controversial and poorly elucidated. Contrasts between aquatic and terrestrial ecosystems in particular have inspired much speculation, but only recent empirical quantification. Here, we review evidence for systematic differences in energy flow and biomass partitioning between producers and herbivores, detritus and decomposers, and higher trophic levels. The magnitudes of different trophic pathways vary considerably, with less herbivory, more decomposers and more detrital accumulation on land. Aquatic–terrestrial differences are consistent across the global range of primary productivity, indicating that structural contrasts between the two systems are preserved despite large variation in energy input. We argue that variable selective forces drive differences in plant allocation patterns in aquatic and terrestrial environments that propagate upward to shape food webs. The small size and lack of structural tissues in phytoplankton mean that aquatic primary producers achieve faster growth rates and are more nutritious to heterotrophs than their terrestrial counterparts. Plankton food webs are also strongly size-structured, while size and trophic position are less strongly correlated in most terrestrial (and many benthic) habitats. The available data indicate that contrasts between aquatic and terrestrial food webs are driven primarily by the growth rate, size and nutritional quality of autotrophs. Differences in food-web architecture (food chain length, the prevalence of omnivory, specialization or anti-predator defences) may arise as a consequence of systematic variation in the character of the producer community.

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Footnotes

    • Received July 19, 2005.
    • Accepted October 17, 2005.
  • © 2005 The Royal Society
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7 January 2006
Volume 273, issue 1582
Proceedings of the Royal Society B: Biological Sciences: 273 (1582)
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All wet or dried up? Real differences between aquatic and terrestrial food webs
Jonathan B Shurin, Daniel S Gruner, Helmut Hillebrand
Proc. R. Soc. B 2006 273 1-9; DOI: 10.1098/rspb.2005.3377. Published 7 January 2006
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All wet or dried up? Real differences between aquatic and terrestrial food webs

Jonathan B Shurin, Daniel S Gruner, Helmut Hillebrand
Proc. R. Soc. B 2006 273 1-9; DOI: 10.1098/rspb.2005.3377. Published 7 January 2006

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