Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast

The red sea urchin Loxechinus albus, an economically important species oceurring along the Chilean littoral benthic systems, has been heavily exploited by artisanal fisheries in recent decades. However, basic knowledge of its trophic biology is still scarce. Studies of this kind are critical to the...

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Autores principales:	GONZÁLEZ,SOLANGE J, CÁCERES,CRISTIAN W, OJEDA,F. PATRICIO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2008
Materias:	assimilation efficieney Loxechinus natural diet trophic selectivity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400010
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spelling	oai:scielo:S0716-078X20080004000102009-06-08Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coastGONZÁLEZ,SOLANGE JCÁCERES,CRISTIAN WOJEDA,F. PATRICIO assimilation efficieney Loxechinus natural diet trophic selectivity The red sea urchin Loxechinus albus, an economically important species oceurring along the Chilean littoral benthic systems, has been heavily exploited by artisanal fisheries in recent decades. However, basic knowledge of its trophic biology is still scarce. Studies of this kind are critical to the successful development of farming techniques as an alternative to the harvest of natural populations. The aims of this study were to quantify the composition of L. albus' natural diet, to determine the assimilation efficieney of the most important dietary components, and to experimentally examine the species' trophic selectivity. Adult and juvenile specimens were sampled in spring 1993 and summer, fall and winter 1994 from the shallow subtidal zone of Iquique, northern Chile. Neither juveniles ñor adults showed significant seasonal differences in dietary composition. The main Ítems in the diet were the green alga Ulva sp. for juveniles and the kelp Lessonia sp. for adults. In adults, assimilation efficieney (as percentage of the total organic matter ingested) was not significantly different among individuals that consumed Lessonia sp. (48.7 %), Ulva sp. (44.6 %) and Macrocystis (38.1 %), whereas in juveniles assimilation efficieney was significantly higher for individuals fed on the chlorophyte Ulva sp. (55.4 %), followed by Lessonia sp. (35.0 %) and Macrocystis (25.5 %). These results suggest that L. albus undergoes an ontogenetic shift in the diet, consisting of a differential foraging strategy between juveniles and adults.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.81 n.4 20082008-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400010en10.4067/S0716-078X2008000400010
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	assimilation efficieney Loxechinus natural diet trophic selectivity
spellingShingle	assimilation efficieney Loxechinus natural diet trophic selectivity GONZÁLEZ,SOLANGE J CÁCERES,CRISTIAN W OJEDA,F. PATRICIO Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast
description	The red sea urchin Loxechinus albus, an economically important species oceurring along the Chilean littoral benthic systems, has been heavily exploited by artisanal fisheries in recent decades. However, basic knowledge of its trophic biology is still scarce. Studies of this kind are critical to the successful development of farming techniques as an alternative to the harvest of natural populations. The aims of this study were to quantify the composition of L. albus' natural diet, to determine the assimilation efficieney of the most important dietary components, and to experimentally examine the species' trophic selectivity. Adult and juvenile specimens were sampled in spring 1993 and summer, fall and winter 1994 from the shallow subtidal zone of Iquique, northern Chile. Neither juveniles ñor adults showed significant seasonal differences in dietary composition. The main Ítems in the diet were the green alga Ulva sp. for juveniles and the kelp Lessonia sp. for adults. In adults, assimilation efficieney (as percentage of the total organic matter ingested) was not significantly different among individuals that consumed Lessonia sp. (48.7 %), Ulva sp. (44.6 %) and Macrocystis (38.1 %), whereas in juveniles assimilation efficieney was significantly higher for individuals fed on the chlorophyte Ulva sp. (55.4 %), followed by Lessonia sp. (35.0 %) and Macrocystis (25.5 %). These results suggest that L. albus undergoes an ontogenetic shift in the diet, consisting of a differential foraging strategy between juveniles and adults.
author	GONZÁLEZ,SOLANGE J CÁCERES,CRISTIAN W OJEDA,F. PATRICIO
author_facet	GONZÁLEZ,SOLANGE J CÁCERES,CRISTIAN W OJEDA,F. PATRICIO
author_sort	GONZÁLEZ,SOLANGE J
title	Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast
title_short	Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast
title_full	Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast
title_fullStr	Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast
title_full_unstemmed	Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast
title_sort	feeding and nutritional ecology of the edible sea urchin loxechinus albus in the northern chilean coast
publisher	Sociedad de Biología de Chile
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400010
work_keys_str_mv	AT gonzalezsolangej feedingandnutritionalecologyoftheedibleseaurchinloxechinusalbusinthenorthernchileancoast AT cacerescristianw feedingandnutritionalecologyoftheedibleseaurchinloxechinusalbusinthenorthernchileancoast AT ojedafpatricio feedingandnutritionalecologyoftheedibleseaurchinloxechinusalbusinthenorthernchileancoast
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Feeding and nutritional ecology of the edible sea urchin Loxechinus albus in the northern Chilean coast

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