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Marine Ecology Progress Series

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MEPS 403:53-61 (2010)  -  DOI:

Stable isotopes reveal a consistent consumer–diet relationship across hundreds of kilometres

Mathew A. Vanderklift1,*, Thomas Wernberg2,3

1CSIRO Marine and Atmospheric Research, Private Bag 5, Wembley, WA 6913, Australia
2Centre for Marine Ecosystems Research, Edith Cowan University, 100 Joondalup Dve, Joondalup, WA 6027, Australia
3School of Plant Biology, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia

ABSTRACT: Characterising geographical variation in trophic interactions is an important step towards understanding the consequences of changes in food webs. We characterised geographical variation across ~1000 km in stable isotope values (δ15N and δ13C) of the widely distributed sea urchin Heliocidaris erythrogramma and macroalgae that are its potential food. Variation in δ15N of H. erythrogramma and macroalgae was typically greatest among locations separated by hundreds of km, while variation in δ13C was typically greatest among reefs separated by a few km. Geographical variation in δ15N and δ13C of H. erythrogramma was well-explained by variation in δ15N and δ13C of the kelp Ecklonia radiata. The slope and intercept of regressions of stable isotope ratios of H. erythrogramma on kelp were within the range predicted if the sea urchin’s diet was exclusively kelp. These results are consistent with high reliance on a single diet across hundreds of km, revealing that H. erythrogramma likely relies predominantly on a single food source, viz. E. radiata, across southwestern Australia.

KEY WORDS: Herbivory · Kelp · Niche width · Sea urchin · Trophic interactions

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Cite this article as: Vanderklift MA, Wernberg T (2010) Stable isotopes reveal a consistent consumer–diet relationship across hundreds of kilometres. Mar Ecol Prog Ser 403:53-61.

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