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Oecologia

, Volume 139, Issue 4, pp 560–567 | Cite as

Upward cascading effects of nutrients: shifts in a benthic microalgal community and a negative herbivore response

  • Anna R. Armitage
  • Peggy Fong
Community Ecology

Abstract

We evaluated the effects of nutrient addition on interactions between the benthic microalgal community and a dominant herbivorous gastropod, Cerithidea californica (California horn snail), on tidal flats in Mugu Lagoon, southern California, USA. We crossed snail and nutrient (N and P) addition treatments in enclosures on two tidal flats varying from 71 to 92% sand content in a temporally replicated experiment (summer 2000, fall 2000, spring 2001). Diatom biomass increased slightly (~30%) in response to nutrient treatments but was not affected by snails. Blooms of cyanobacteria (up to 200%) and purple sulfur bacteria (up to 400%) occurred in response to nutrient enrichment, particularly in the sandier site, but only cyanobacterial biomass decreased in response to snail grazing. Snail mortality was 2–5 times higher in response to nutrient addition, especially in the sandier site, corresponding to a relative increase in cyanobacterial biomass. Nutrient-related snail mortality occurred only in the spring and summer, when the snails were most actively feeding on the microalgal community. Inactive snails in the fall showed no response to nutrient-induced cyanobacterial growths. This study demonstrated strongly negative upward cascading effects of nutrient enrichment through the food chain. The strength of this upward cascade was closely linked to sediment type and microalgal community composition.

Keywords

Cerithidea californica Cyanobacteria Diatom Trophic cascade 

Notes

Acknowledgements

We thank Thomas Keeney and the US Navy for providing access to the research site and Brian Dolan and numerous others for field and laboratory assistance. We are indebted to James L. Pinckney and Alyce R. Lee at Texas A&M University for their generosity and time in the use of J. Pinckney’s HPLC apparatus and pigment standards. Many thanks to Richard R. Vance, Richard R. Ambrose, and two anonymous reviewers for helpful comments on an earlier version of the manuscript. This project was funded in part by a UC Coastal Environmental Quality Initiative Graduate Fellowship to A.A. and a grant from the EPA (#R827637) to P.F.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Department of Organismic Biology, Ecology and EvolutionUniversity of California Los AngelesLos AngelesUSA
  2. 2.Southeast Environmental Research Center—OE 148Florida International UniversityMiamiUSA

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