A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia

In this study, the structure of the polyps and the cell types of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata were compared, together with the composition of the fatty acids in their tissues. S. hystrix displayed an apparent lack of specialized feeding cells, notably the rel...

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Autores principales:	Al-Sofyani,A. A, Niaz,G. R
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2007
Materias:	Cnidae type competition coral reefs feeding strategies Red Sea
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572007000300001
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spelling	oai:scielo:S0718-195720070003000012008-03-11A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi ArabiaAl-Sofyani,A. ANiaz,G. R Cnidae type competition coral reefs feeding strategies Red Sea In this study, the structure of the polyps and the cell types of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata were compared, together with the composition of the fatty acids in their tissues. S. hystrix displayed an apparent lack of specialized feeding cells, notably the relatively small number of mucous gland cells and the low percentage of venom containing nematocysts. P-mastigophores accounted for 1.52-5.7% and, B-mastigophores for 1.28% of the nematocysts. Conversely there was a high percentage of holotrichs nematocysts (24.86 - 55.5%) in the tentacles and mesenterial filaments respectively. Zooxanthellae were abundant in the gastrodermis. These charateristics suggest that S. hystrix relies essentially upon autotrophic nutrition. The polyps of X. umbellata were devoid of cnidae, and mucous glands were in abundance, particularly in the lower part of the polyp. The presence of particulate matter in the coelenteron, and low number of zooxanthellae indicate that X. umbellata is a suspension feeder, using mucus to trap the particles on the pinnate tentacles. Differences were also revealed by a comparative study of their chemical composition. X. umbellata had a high protein and lipid content, whilst S. hystrix was characterized by high calcium carbonate content. In S. hystrix, the fatty acids were found to be predominantly saturated fatty acids (87.3%), the most abundant being 16:0 and 18:0. X. umbellata showed a predominance of unsaturated fatty acids (77.7%), the most abundant being 16:1 and 18:1. The differences in morphology and in biochemical composition suggest that S. hystrix has a greater reliance on autotrophic feeding whilst X. umbellata is a more heterotrophic suspension feederinfo:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.42 n.3 20072007-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572007000300001en10.4067/S0718-19572007000300001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cnidae type competition coral reefs feeding strategies Red Sea
spellingShingle	Cnidae type competition coral reefs feeding strategies Red Sea Al-Sofyani,A. A Niaz,G. R A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia
description	In this study, the structure of the polyps and the cell types of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata were compared, together with the composition of the fatty acids in their tissues. S. hystrix displayed an apparent lack of specialized feeding cells, notably the relatively small number of mucous gland cells and the low percentage of venom containing nematocysts. P-mastigophores accounted for 1.52-5.7% and, B-mastigophores for 1.28% of the nematocysts. Conversely there was a high percentage of holotrichs nematocysts (24.86 - 55.5%) in the tentacles and mesenterial filaments respectively. Zooxanthellae were abundant in the gastrodermis. These charateristics suggest that S. hystrix relies essentially upon autotrophic nutrition. The polyps of X. umbellata were devoid of cnidae, and mucous glands were in abundance, particularly in the lower part of the polyp. The presence of particulate matter in the coelenteron, and low number of zooxanthellae indicate that X. umbellata is a suspension feeder, using mucus to trap the particles on the pinnate tentacles. Differences were also revealed by a comparative study of their chemical composition. X. umbellata had a high protein and lipid content, whilst S. hystrix was characterized by high calcium carbonate content. In S. hystrix, the fatty acids were found to be predominantly saturated fatty acids (87.3%), the most abundant being 16:0 and 18:0. X. umbellata showed a predominance of unsaturated fatty acids (77.7%), the most abundant being 16:1 and 18:1. The differences in morphology and in biochemical composition suggest that S. hystrix has a greater reliance on autotrophic feeding whilst X. umbellata is a more heterotrophic suspension feeder
author	Al-Sofyani,A. A Niaz,G. R
author_facet	Al-Sofyani,A. A Niaz,G. R
author_sort	Al-Sofyani,A. A
title	A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia
title_short	A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia
title_full	A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia
title_fullStr	A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia
title_full_unstemmed	A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia
title_sort	comparative study of the components of the hard coral seriatopora hystrix and the soft coral xenia umbellata along the jeddah coast, saudi arabia
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572007000300001
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A comparative study of the components of the hard coral Seriatopora hystrix and the soft coral Xenia umbellata along the Jeddah coast, Saudi Arabia

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