Distribution of intertidal macrobenthic assemblages in relation to environmental factors in the Tagus estuary, western Portugal

  1. ANXO CONDE 1
  2. JORGE DOMÍNGUEZ 2
  1. 1 BB-Institute for Biotechnology and Bioengineering, Centre for Biological and Chemical Engineering, Instituto Superior Técnico (IST), 1049-001, Lisbon, Portugal. Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, Vigo E-36310, Spain.
  2. 2 Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, Vigo E-36310, Spain.
Revista:
Scientia Marina

ISSN: 0214-8358

Ano de publicación: 2013

Volume: 77

Número: 1

Páxinas: 179-188

Tipo: Artigo

DOI: 10.3989/SCIMAR.03628.21E DIALNET GOOGLE SCHOLAR lock_openAcceso aberto editor

Outras publicacións en: Scientia Marina

Resumo

Distribución intermareal de las poblaciones de macroinvertebrados en el estuario del Tajo, Portugal, en relación con factores ambientales. – Se han estudiado las poblaciones de macroinvertebrados y su distribución en relación a varios factores ambientales en catorce estaciones de muestreo da la zona intermareal situadas en la región central, margen Este, del estuario del Río Tajo. El gradiente salino fue sobrepuesto sobre las poblaciones macrobentónicas tras aplicar un escalado multidimensional no métrico (NMDS). El análisis reveló que la salinidad no es un factor ambiental significativo en la distribución de las poblaciones macrobentónicas de la zona en estudio. En cambio, se identificó un gradiente lateral que caracterizó los grupos de estaciones de muestreo agrupadas según su localización exterior, interior e intermedia, igualmente relacionadas con los factores ambientales contenido de materia orgánica, concentración de oxígeno y potencial redox. Aunque no se ha medido el factor hidrodinámico, éste parece ser importante para la definición del gradiente lateral. De modo general se observó una transición gradual entre los grupos de poblaciones macrobentónicas desde los situados en la parte de mayor influencia marina hacia aquellos que se distribuyeron en zonas más alejadas del mar en sentido lateral o longitudinal. Los poliquetos Lanice conchilega y Hediste diversicolor y el gasterópodo Hydrobia ulvae fueron las especies características de los grupos de estaciones exterior, interior e intermedio respectivamente. Se ha concluido que el gradiente lateral es el principal condicionante ambiental que explica la distribución de las poblaciones de macroinvertebrados intermareales en el estuario del Río Tajo cuando el gradiente salino no es significativamente importante.

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