Results 121 to 130 of about 417 (152)
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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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The Shadow Reaction of Diadema Antillarum Philippi
Journal of Experimental Biology, 1960ABSTRACT Our previous account of the spectral sensitivity (Millott & Yoshida, 1957) was based on a study of the spine response in isolated pieces of test bearing many spines. The areas illuminated and shaded extended over the whole internal or external surface.
N. Millott, M. Yoshida
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Fertilization limitation of Diadema antillarum on coral reefs in the Florida Keys
Ecology, 2016AbstractMass mortality of the sea urchin Diadema antillarum due to disease outbreaks in 1983 and 1991 decimated populations in the Florida Keys, and they have yet to recover. Here, we use a coupled advection–diffusion and fertilization–kinetics model to test the hypothesis that these populations are fertilization limited.
Colette J, Feehan +4 more
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The Great Diadema antillarum Die-Off: 30 Years Later*
Annual Review of Marine Science, 2016In 1983-1984, the sea urchin Diadema antillarum suffered mass mortality throughout the Caribbean, Florida, and Bermuda. The demise of this herbivore contributed to a phase shift of Caribbean reefs from coral-dominated to alga-dominated communities. A compilation of published data of D.
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Phenolases and melanogenesis in the coelomic fluid of the echinoid Diadema antillarum Phillippi
Proceedings of the Royal Society of London. Series B - Biological Sciences, 1953Abstract Melanin is formed with in the coelomic amoebocytes of Diadema when exposed to air in vitro by a process of oxidation involving enzymes. It appears in association with spheroidal inclusions. An enzyme system with both mono- and polyphenolase activity has been demonstrated in the amoebocytes, which is affected by the same ...
F W, JACOBSON, N, MILLOTT
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Arrested recovery of Diadema antillarum population: Survival or recruitment limitation?
Estuarine, Coastal and Shelf Science, 2015Abstract Densities of the long-spined sea urchin Diadema antillarum remain significantly below pre mass-mortality levels at most Caribbean localities. The arrested recovery of this formerly abundant herbivore has been attributed to low supply of recruits and high post settlement mortality.
Ruber Rodríguez-Barreras +3 more
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Demographic history of Diadema antillarum, a keystone herbivore on Caribbean reefs
2015(Uploaded by Plazi for the Bat Literature Project) The Mexican free-tailed bat (Tadarida brasiliensis) is one of the most widely distributed bat species in the Western Hemisphere. Despite their prevalence in urban environments, limited research has been conducted to determine the features of buildings or of the surroundings that might affect the ...
Li, Han, Wilkins, Kenneth T.
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The Spectral Sensitivity of the Echinoid Diadema Antillarum Philippi
Journal of Experimental Biology, 1957ABSTRACT Several species of sea urchin show sensitivity to light, by the reactions of the whole animal or those of effectors such as the spines, podia, pedicellariae and chromatophores. The reactions have recently been reviewed by Millott (1954, 1956, 1957a).
N. Millott, M. Yoshida
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Ultrastructure of the tube foot wall of a regular echinoid,Diadema antillarum Philippi
Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1969An ultrastructural study of the tube foot wall of a regular echinoid,Diadema antillarum, was made. Ciliated microvillous epithelial cells, their inclusions, amoebocytes, and the arrangement of collagen and muscle in the tube feet are described. The neuropile, together with its vesicular components and possible neurosecretory elements, is considered and
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