Food-web assembly during a classic biogeographic study: Species' "trophic breadth" corresponds to colonization order

Denise A. Piechnik, Sharon P. Lawler, Neo D Martinez

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Ecologists have found many patterns in food-web structure. Some, like the constant connectance hypothesis, lack definitive explanatory mechanisms. In response, we investigated whether community assembly mechanisms could explain why trophic complexity consistently scales with species richness among ecosystems. We analyzed how food-web structure developed during the community assembly recorded in Simberloff and Wilson's classic biogeography experiment. Using their arthropod surveys, we constructed six time series of food-webs from pre- and post-defaunation censuses of six experimental islands, and synthesized trophic information for 250 species from the literature and expert sources. We found that the fraction of specialist species increased and the fraction of generalists decreased during food-web assembly. Directed connectance initially declined over time, despite an increase in species richness, but eventually leveled off as predicted by the constant connectance hypothesis of diversity-complexity scaling. The initial decline was explained by later colonization by trophic specialists, probably due to limited resource availability during early colonization. Late-colonizing super-generalists maintained constant connectance at later dates. This relationship between colonization success and trophic breadth helps explain food-web patterns and corroborates assertions that community assembly is systematically influenced by species' trophic breadths.

Original languageEnglish (US)
Pages (from-to)665-674
Number of pages10
JournalOikos
Volume117
Issue number5
DOIs
StatePublished - May 2008
Externally publishedYes

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food webs
food web
colonization
generalist
species richness
insect surveys
species diversity
resource availability
ecologists
biogeography
arthropod
census
time series analysis
time series
ecosystems
ecosystem
experiment

ASJC Scopus subject areas

  • Ecology

Cite this

Food-web assembly during a classic biogeographic study : Species' "trophic breadth" corresponds to colonization order. / Piechnik, Denise A.; Lawler, Sharon P.; Martinez, Neo D.

In: Oikos, Vol. 117, No. 5, 05.2008, p. 665-674.

Research output: Contribution to journalArticle

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