Integrative Biology Commons^™

Grazing And Control Of Coral Reef Community Structure By Diadema Antillarum Philippi (Echinodermata: Echinoidea): A Preliminary Study, P. Sammarco, J. S. Levinton, John C. Ogden

Integrative Biology Faculty and Staff Publications

The grazing activities of the tropical echinoid Diadema antillarum Philippi can markedly influence the structure of the shallow-water epibenthic coral reef community. The elimination of an entire Diadema population from a patch reef in St. Croix, U.S. Virgin Islands resulted in a great increase in macro-algal biomass, alterations in species composition, shifts in dominance, an increase in species numbers, and a decrease in equitability. The increase noted in number of species may be indicative of either initial pre-competitive phases of succession or the creation of a new habitat- the micro-canopy. Experiments involving the caging of Diadema have shown that the …

The Effect Of Applied Nitrogen And Subterranean Clover On The Growth Of Doublegee, D J. Gilbey

Journal of the Department of Agriculture, Western Australia, Series 4

Until 20 years ago doublegees in Western Australia were mainly confined to the red-brown earth soils of the wheatbelt.

Since then, they have spread to light loamy sand soils in the wheatbelt, many of which have carried subterranean clover from the mid-1940s onwards.

It has been widely presumed that the spread of doublegees on to the lighter sandy soils of W.A. can be associated with the establishment of subterranean clover on these soils.

This report summarises the results of a glasshouse experiment on the effect of clover and nitrogen on the growth of doublegee.