Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California

Populations of the polyplacophoran mollusk Chiton albolineatus were studied at 6 sites with different wave exposure of the rocky shores of 3 islands of Mazatlan Bay (southeastern side of the Gulf of California). This chiton species is endemic to the Mexican Pacific coast. Chitons were sampled on wav...

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Autores principales:	Flores-Campaña,Luis Miguel, Arzola-González,Juan Francisco, de León-Herrera,Ramón
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2012
Materias:	Body size chitons wave exposure Mexican Pacific islands
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000200004
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spelling	oai:scielo:S0718-195720120002000042012-11-29Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of CaliforniaFlores-Campaña,Luis MiguelArzola-González,Juan Franciscode León-Herrera,Ramón Body size chitons wave exposure Mexican Pacific islands Populations of the polyplacophoran mollusk Chiton albolineatus were studied at 6 sites with different wave exposure of the rocky shores of 3 islands of Mazatlan Bay (southeastern side of the Gulf of California). This chiton species is endemic to the Mexican Pacific coast. Chitons were sampled on wave-exposed and wave-protected sites in the intertidal zone of these islands from January to December 2008 to determine its demographic patterns based on density and body size. Length (L), breadth (B) and height (H) of chiton body ranged between 8.3 and 55.1 (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 28.9 ± 6.2), 3.0-30.4 (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 14.8 ± 3.4) and 0.9-19.1 (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 5.0 ± 1.8) mm, respectively, and their wet weight (W) varied from 0.1 to 10.2 g (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 1.7 ± 0.9). The biometric relationships were B = 0.478 (L) + 1.212, H = 0.198 (L) - 1.170 and H = 0.389 (B) - 1.277, for size and W = 0.0002 (L)2.710, W = 0.0008 (B)2.743 and W = 0.0792 (H)1.908 for weight. The value of the slope of the length-weight relationship was significantly lower than 3, which indicates negative allometric growth. Average densities ranged from 0.1 to 2.9 org. m-2 and were higher in the exposed sites than in the protected sites of each island, possibly because of a lower predation pressure in areas exposed to high wave energy than in sheltered areas, while its body size were larger in the exposed sites of two islands. This could be interpreted as a result of migration from sites protected from the wave action, where survival of smaller individuals is more likely than in exposed areas.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.47 n.2 20122012-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000200004en10.4067/S0718-19572012000200004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Body size chitons wave exposure Mexican Pacific islands
spellingShingle	Body size chitons wave exposure Mexican Pacific islands Flores-Campaña,Luis Miguel Arzola-González,Juan Francisco de León-Herrera,Ramón Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California
description	Populations of the polyplacophoran mollusk Chiton albolineatus were studied at 6 sites with different wave exposure of the rocky shores of 3 islands of Mazatlan Bay (southeastern side of the Gulf of California). This chiton species is endemic to the Mexican Pacific coast. Chitons were sampled on wave-exposed and wave-protected sites in the intertidal zone of these islands from January to December 2008 to determine its demographic patterns based on density and body size. Length (L), breadth (B) and height (H) of chiton body ranged between 8.3 and 55.1 (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 28.9 ± 6.2), 3.0-30.4 (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 14.8 ± 3.4) and 0.9-19.1 (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 5.0 ± 1.8) mm, respectively, and their wet weight (W) varied from 0.1 to 10.2 g (<img border=0 width=8 height=18 src="http://fbpe/img/revbiolmar/v47n2/promedio.jpg"> = 1.7 ± 0.9). The biometric relationships were B = 0.478 (L) + 1.212, H = 0.198 (L) - 1.170 and H = 0.389 (B) - 1.277, for size and W = 0.0002 (L)2.710, W = 0.0008 (B)2.743 and W = 0.0792 (H)1.908 for weight. The value of the slope of the length-weight relationship was significantly lower than 3, which indicates negative allometric growth. Average densities ranged from 0.1 to 2.9 org. m-2 and were higher in the exposed sites than in the protected sites of each island, possibly because of a lower predation pressure in areas exposed to high wave energy than in sheltered areas, while its body size were larger in the exposed sites of two islands. This could be interpreted as a result of migration from sites protected from the wave action, where survival of smaller individuals is more likely than in exposed areas.
author	Flores-Campaña,Luis Miguel Arzola-González,Juan Francisco de León-Herrera,Ramón
author_facet	Flores-Campaña,Luis Miguel Arzola-González,Juan Francisco de León-Herrera,Ramón
author_sort	Flores-Campaña,Luis Miguel
title	Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California
title_short	Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California
title_full	Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California
title_fullStr	Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California
title_full_unstemmed	Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California
title_sort	body size structure, biometric relationships and density of chiton albolineatus (mollusca: polyplacophora) on the intertidal rocky zone of three islands of mazatlan bay, se of the gulf of california
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572012000200004
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Body size structure, biometric relationships and density of Chiton albolineatus (Mollusca: Polyplacophora) on the intertidal rocky zone of three islands of Mazatlan Bay, SE of the Gulf of California

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