Spatial Variations in Density and Size of the Echinoid Diadema Antillarum Philippi on some Venezuelan Coral Reefs
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چکیده
منابع مشابه
Abundance, distribution and size structure of Diadema antillarum (Echinodermata: Diadematidae) in South Eastern Cuban coral reefs.
The 1983-1984 mass mortality event of Diadema antillarum affected more than 93% of the total Caribbean population. Although there are no records about the status of Diadema populations before and after die-off on Cuban reefs, anecdotal information suggests that populations were struck. We analyzed spatial variation in the abundance and size structure of D. antillarum in 22 reefs sites in Jardin...
متن کاملThe electrical activity of the radial nerve in Diadema antillarum Philippi and certain other echinoids.
Electrophysiological studies in echinoderms are rare. In echinoids investigations have been made by Takahashi and Sandeman. The former used Diadema setosum, the latter Strongylocentrotus, Tripneustes and Toxopneustes. Takahashi gives a brief account of the electrical concomitant of the photic responses already described in detail by Millott and co-workers. Behavioural studies showed that the ra...
متن کاملThe occurrence of melanin in the sea-urchin, Diadema antillarum Philippi.
The characteristic dark color of Diadema antillarum is chiefly attributable to a black pigment, most of which is contained in large epidermal chromatophores (see Fig. 1). A red pigment is also present, but is easily separable from the black, being readily soluble in ethanol and acetone, whereas the black is not. The nature of the red pigment is unknown and we have not studied its properties. Co...
متن کاملDemographic history of Diadema antillarum, a keystone herbivore on Caribbean reefs.
The sea urchin Diadema antillarum was the most important herbivore on Caribbean reefs until 1983, when mass mortality reduced its populations by more than 97%. Knowledge of its past demography is essential to reconstruct reef ecology as it was before human impact, which has been implicated as having caused high pre-mortality Diadema abundance. To determine the history of its population size, we...
متن کاملLimnol. Oceanogr., 44(6), 1999, 1586–1592
. 1996. Demographic approaches to community dynamics: A coral reef example. Ecology 77: 2256–2260. , B. D. KELLER, J. B. C. JACKSON, AND M. J. BOYLE. 1985. Mass mortality of the echinoid Diadema antillarum in Jamaica. Bull. Mar. Sci. 36: 377–384. , D. C. REED, AND M. J. BOYLE. 1987. Herbivory on coral reefs: Community structure following mass-mortality of sea urchins. J. Exp. Mar. Biol. Ecol. 1...
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ژورنال
عنوان ژورنال: Bijdragen tot de Dierkunde
سال: 1984
ISSN: 0067-8546,2666-0644
DOI: 10.1163/26660644-05401006