Results 141 to 150 of about 6,145 (182)
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On the dynamics of the mass mortality of Diadema antillarum in Barbados
Coral Reefs, 1986Widespread mortality of the black sea urchin Diadema antillarum occurred in the Caribbean in 1983; beginning in Panama in January, and having its major impact at Barbados in September. Mortality on ten reefs surveyed in Barbados was 93.2%, with the highest being 99.9% and the lowest 86.9%.
Wayne Hunte +2 more
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Diadema antillarum Was Not a Keystone Predator in Cryptic Reef Environments
Science, 1987The ecological impact of the disappearance of a major predator depends on the responsiveness of the prey. Mass mortality of the most abundant grazer in Caribbean cryptic reef environments, the sea urchin Diadema antillarum , selectively decreased rates of mortality of encrusting organisms by half, yet community ...
J B, Jackson, K W, Kaufmann
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Pigmentary System of Diadema antillarum Philippi
Nature, 1964THE echinoid Diadema antillarum Philippi shows both morphological and physiological (reversible) changes in colour1,2; the former is far more complex than previously supposed and the intimate mechanism of the latter may be, in part at least, of a type hitherto unsuspected.
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The Iridophores of the Echinoid Diadema antillarum
Journal of Cell Science, 1961ABSTRACT The blue pattern seen when the skin of Diadema antillarum is viewed by reflected light is due to iridophores. The quality of their blueness varies with the background provided by neighbouring chromatophores. Microdissection reveals that they consist of gelatinous plates contained in a fibrous and cellular capsule.
Norman Millott, Brenda M. Manly
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Barium spikes are generated in the spines of the sea urchin Diadema antillarum
Comparative Biochemistry and Physiology Part A: Physiology, 1987In the presence of calcium, Ba2+ ions, at concentrations as low as 1-2 mM, block the action potentials (a.p.'s) elicited by the electrical stimulation of the primary spines of Diadema antillarum. Lower concentrations of barium (0.1 mM) potentiate the a.p.'s recorded from spines equilibrated with Ca-Free artificial sea water (ASW).
Z M, Hernandez +3 more
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Predation of the sea urchin Diadema antillarum Philippi on living coral
Oecologia, 1975On the coral reefs of Curaçao and Bonaire (Netherlands Antilles) the sea urchin Diadema antillarum is a major coral predator. In areas with high coral cover, up to 8.2% of the Diadema population (with a density of 8.5 animals/m2) was feeding on living coral surfaces at night. Acropora species are the most heavily attacked corals.
Rolf P M, Bak, Guillaume, van Eys
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Colour pattern and the definition of the species,Diadema antillarum philippi
Experientia, 1953Es wird angenommen, dass der SeeigelDiadema antillarum sich von ihm nahestehenden Arten in mehreren Merkmalen einschliesslich des blauen Farbmusters auf der Schale unterscheidet, welches die Form von Linien (keine Flecken) besitzt und keinen Ring um das Analfeld bildet.
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Mass mortality of Diadema antillarum on the Caribbean coast of Panama
Coral Reefs, 1984The ecologically important sea urchin Diadema antillarum suffered mass mortalities in 1983, first noted in Panama and then reported from the rest of the Caribbean. We documented the effects of this mortality at two localities on the Atlantic coast of Panama, Punta Galeta and the San Blas Archipelago.
H. A. Lessios +6 more
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Assessment of current rates of Diadema antillarum larval settlement
Coral Reefs, 2009The generally slow and incomplete recovery of the long-spined sea urchin, Diadema antillarum, from the 1983–84 Caribbean-wide die-off, particularly in the Florida Keys, USA, raises the question of factors limiting population recovery. This study sought to quantify larval settlement rates as an indicator of larval supply at two sites in the Florida Keys,
M. W. Miller +4 more
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Colour Change in the Echinoid, Diadema antillarum, Philippi
Nature, 1952PHYSIOLOGICAL colour change has been but rarely reported in echinoderms1. Mortensen2, in a footnote, makes cautious reference to the possibility of such changes occurring in Diadema antillarum; but it is clear that he was not aware of the striking manifestation of the phenomenon reported here, which occurs in young forms of this species. Indications of
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