Symmetrical Web of Carpinteria Salt Marsh
K. D. Lafferty et al

The authors analyzed the effect of parasites on food-web topology in a salt marsh ecosystem. 
The data set is available via the NCEAS Data Repository.

Lafferty, K. D., Hechinger, R. F., Shaw, J. C., Whitney, K. L. & Kuris, A. M. (2006b) Food Webs and Parasites in a Salt Marsh Ecosystem. In Disease Ecology: Community Structure and Pathogen Dynamics (ed. S. Collinge & C. Ray), pp. 119-134. Oxford: Oxford University Press.