UNI101Y1 Study Guide - Trophic Cascade, Brown Algae, Omnivore
16 Feb 2013
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Bio120h lisa zhao 2011 | page 4 d l e i f e h t n i s t s i g o l o c e. Assembled communities of producers (algae), detritivores (bacteria), consumers of algae and bacteria (protzoans), omnivorous predators (rotifers) in bottles. Communities differed in diversity and nutrient levels. Simulated mortality by removing 90% from some microcosms in. Measured how rapidly the total biomass of those communities al. returned to levels of undisturbed (how fast can a community sys. return to its original state. High nutrient supply resilience differed little b/w diff. diversity communities. Low productivity resilience +vely related to # of species in the community after. The rapid reproductive rates of algae (provide abundant food source to rebuild pop. at higher trophic levels) Greater resilience in more diverse might not reflect species diversity. By chance include one or more species that can maintain rapid growth under low-nutrient conditions. Ways community stability is influenced by species diversity:
