Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile

Sediment samples were monthly collected at Queule river estuary (ca. 39° S), south-central Chile, from October 1990 to April 1992, and from September 1995 to November 1997 to study temporal variability in population abundances of the macroinfauna inhabiting sandy and muddy-sand intertidal substrates...

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Autores principales:	JARAMILLO,EDUARDO, CONTRERAS,HERALDO, QUIJÓN,PEDRO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2001
Materias:	macroinfaunal population abundances estuarine intertidal flats south central Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200019
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spelling	oai:scielo:S0716-078X20010002000192001-11-08Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central ChileJARAMILLO,EDUARDOCONTRERAS,HERALDOQUIJÓN,PEDRO macroinfaunal population abundances estuarine intertidal flats south central Chile Sediment samples were monthly collected at Queule river estuary (ca. 39° S), south-central Chile, from October 1990 to April 1992, and from September 1995 to November 1997 to study temporal variability in population abundances of the macroinfauna inhabiting sandy and muddy-sand intertidal substrates. Sandy sediments had higher percentages of sand particles and lower percentages of mud particles, biogenic aggregates and total organic matter than muddy-sand sediments. The same macroinfaunal species were found at both sites. That macroinfauna was dominated by polychaetes: the spionid Prionospio (Minuspio) patagonica Augener 1923, the capitellid Capitella sp. and the nereid Perinereis gualpensis Jeldes 1963. Other common organisms were the amphipod Paracorophium hartamannorum Andres 1975 and the small bivalve Kingiella chilenica Soot-Ryen 1959. The highest abundances of the total macroinfauna usually ocurred during summer months (January-February). The most abundant species was P. (M.) patagonica (up to 130-140,000 ind m-2 in the muddy-sand sediments). During some months, this species had significantly higher abundances at the muddy-sand sediments. A similar trend is that shown by P. hartmannorum; i.e., significantly higher abundances at the muddy-sand sediments (up to 75,000 ind m-2). During many months, the population abundances of Capitella sp. and K. chilenica were significantly higher at the sandy site. The highest population abundances of Capitella sp. were close to 37,800 ind m-2 (February 1991 and February 1996), while the maximum values for K. chilenica ranged from 13,000 to 14,000 ind m-2 (February 1991 and November 1995, respectively). The population abundances of P. gualpensis (with the exception of the period October 1995-January 1996) were similar at both sites. Interannual comparisons of macroinfaunal abundances carried out for the sandy site showed no significant differences among years for the total macroinfauna and for all the species, but P. gualpensis. No significant differences among years were found for the total macroinfauna, P. (M. ) patagonica, P. gualpensis and P. hartmannorum at the muddy-sand site. On the other hand, the abundances of Capitella sp. and K. chilenica differed significantly among years. Significant differences among months within annual periods were found for the total macroinfauna and species population abundances at the sandy and muddy-sand sites. The temporal variability of the macroinfauna did not have any significant relationship with the temporal variability in sediment characteristicsinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.74 n.2 20012001-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200019en10.4067/S0716-078X2001000200019
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	macroinfaunal population abundances estuarine intertidal flats south central Chile
spellingShingle	macroinfaunal population abundances estuarine intertidal flats south central Chile JARAMILLO,EDUARDO CONTRERAS,HERALDO QUIJÓN,PEDRO Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile
description	Sediment samples were monthly collected at Queule river estuary (ca. 39° S), south-central Chile, from October 1990 to April 1992, and from September 1995 to November 1997 to study temporal variability in population abundances of the macroinfauna inhabiting sandy and muddy-sand intertidal substrates. Sandy sediments had higher percentages of sand particles and lower percentages of mud particles, biogenic aggregates and total organic matter than muddy-sand sediments. The same macroinfaunal species were found at both sites. That macroinfauna was dominated by polychaetes: the spionid Prionospio (Minuspio) patagonica Augener 1923, the capitellid Capitella sp. and the nereid Perinereis gualpensis Jeldes 1963. Other common organisms were the amphipod Paracorophium hartamannorum Andres 1975 and the small bivalve Kingiella chilenica Soot-Ryen 1959. The highest abundances of the total macroinfauna usually ocurred during summer months (January-February). The most abundant species was P. (M.) patagonica (up to 130-140,000 ind m-2 in the muddy-sand sediments). During some months, this species had significantly higher abundances at the muddy-sand sediments. A similar trend is that shown by P. hartmannorum; i.e., significantly higher abundances at the muddy-sand sediments (up to 75,000 ind m-2). During many months, the population abundances of Capitella sp. and K. chilenica were significantly higher at the sandy site. The highest population abundances of Capitella sp. were close to 37,800 ind m-2 (February 1991 and February 1996), while the maximum values for K. chilenica ranged from 13,000 to 14,000 ind m-2 (February 1991 and November 1995, respectively). The population abundances of P. gualpensis (with the exception of the period October 1995-January 1996) were similar at both sites. Interannual comparisons of macroinfaunal abundances carried out for the sandy site showed no significant differences among years for the total macroinfauna and for all the species, but P. gualpensis. No significant differences among years were found for the total macroinfauna, P. (M. ) patagonica, P. gualpensis and P. hartmannorum at the muddy-sand site. On the other hand, the abundances of Capitella sp. and K. chilenica differed significantly among years. Significant differences among months within annual periods were found for the total macroinfauna and species population abundances at the sandy and muddy-sand sites. The temporal variability of the macroinfauna did not have any significant relationship with the temporal variability in sediment characteristics
author	JARAMILLO,EDUARDO CONTRERAS,HERALDO QUIJÓN,PEDRO
author_facet	JARAMILLO,EDUARDO CONTRERAS,HERALDO QUIJÓN,PEDRO
author_sort	JARAMILLO,EDUARDO
title	Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile
title_short	Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile
title_full	Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile
title_fullStr	Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile
title_full_unstemmed	Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile
title_sort	seasonal and interannual variability in population abundances of the intertidal macroinfauna of queule river estuary, south-central chile
publisher	Sociedad de Biología de Chile
publishDate	2001
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200019
work_keys_str_mv	AT jaramilloeduardo seasonalandinterannualvariabilityinpopulationabundancesoftheintertidalmacroinfaunaofqueuleriverestuarysouthcentralchile AT contrerasheraldo seasonalandinterannualvariabilityinpopulationabundancesoftheintertidalmacroinfaunaofqueuleriverestuarysouthcentralchile AT quijonpedro seasonalandinterannualvariabilityinpopulationabundancesoftheintertidalmacroinfaunaofqueuleriverestuarysouthcentralchile
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Seasonal and interannual variability in population abundances of the intertidal macroinfauna of Queule river estuary, south-central Chile

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