Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate

Mineral composition, granulometry, cohesion, relative and absolute density, and the pH of samples of the Santa Elena sedimentary rock shoal (37°56′02″ S; 58°11′35″ W; Argentina) were determined in order to relate the endolithic fauna with the properties of the substrate. Twenty three samples were co...

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Autores principales:	Amor, Agustín, López Armengol, María Fernanda, Iñíguez Rodríguez, Adrián Mario, Traversa, Luis P.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	1991
Materias:	Biología Calcite Relative Density Argentina Mineral Composition Compressive Fracture
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/134315
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-134315
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Biología Calcite Relative Density Argentina Mineral Composition Compressive Fracture
spellingShingle	Biología Calcite Relative Density Argentina Mineral Composition Compressive Fracture Amor, Agustín López Armengol, María Fernanda Iñíguez Rodríguez, Adrián Mario Traversa, Luis P. Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate
topic_facet	Biología Calcite Relative Density Argentina Mineral Composition Compressive Fracture
description	Mineral composition, granulometry, cohesion, relative and absolute density, and the pH of samples of the Santa Elena sedimentary rock shoal (37°56′02″ S; 58°11′35″ W; Argentina) were determined in order to relate the endolithic fauna with the properties of the substrate. Twenty three samples were collected in December 1987, applying a systematic sampling method to an intertidal area of 5 500 m2. The mineral composition was determined using x-ray diffraction. Cohesion was determined by visual evaluation of the disintegration of the sample following various periods of immersion in water and by recording the resistance to compressive fracture according to the American Society for Testing and Materials (ASTM) standard. The ASTM standard was also followed for measurement of absolute and relative densities and porosity. The rock was ground up in distilled water and the pH of the resulting liquid measured over a period of 24 h. The data were analysed using numerical taxonomy, and in a supplementary study a granulometric analysis was attempted using five representative samples. The endolithic species selected were: the sipunculanThemiste petricola; the polychaetes Polydora sp. and Pherusa sp., and the bivalvesLithophaga patagonica, Petricola patagonica, Saxicava solida, Barnea lamellosa, andPholadidea darwini. The mineral analysis indicated heterogeneous composition and spatial distribution characteristic of a loess. In terms of cohesion, the substrate displayed varying degrees of disintegration, with resistance ranging from zero to very high (254.6 kg/cm2). The endolithic faunaThemiste petricola, Polydora sp.,Pherusa sp.,Lithophaga patagonica, Petricola patagonica, andSaxicava solida were found in areas of low to very high cohesion, with or without calcite. The Pholadidae were found in areas of zero to low cohesion, with absence or traces of calcite. This study indicates the important role of cohesion in determining the distribution of the endolithic fauna.
format	Articulo Articulo
author	Amor, Agustín López Armengol, María Fernanda Iñíguez Rodríguez, Adrián Mario Traversa, Luis P.
author_facet	Amor, Agustín López Armengol, María Fernanda Iñíguez Rodríguez, Adrián Mario Traversa, Luis P.
author_sort	Amor, Agustín
title	Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate
title_short	Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate
title_full	Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate
title_fullStr	Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate
title_full_unstemmed	Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate
title_sort	intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate
publishDate	1991
url	http://sedici.unlp.edu.ar/handle/10915/134315
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Intertidal endolithic fauna and it's relationship to the mineralogical, physical and chemical characteristics of the substrate

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