Population dynamics, distribution and secondary production of the brown shrimp <i>Crangon crangon</i> (L.) in a southern European estuary. Latitudinal variations

Iván Viegas; Filipe Martinho; João Neto; Miguel Pardal

doi:10.3989/scimar.2007.71n3451

Autores/as

Iván Viegas Institute of Marine Research (IMAR), University of Coimbra, Coimbra
Filipe Martinho Institute of Marine Research (IMAR), University of Coimbra, Coimbra
João Neto Institute of Marine Research (IMAR), University of Coimbra, Coimbra
Miguel Pardal Institute of Marine Research (IMAR), University of Coimbra, Coimbra

DOI:

https://doi.org/10.3989/scimar.2007.71n3451

Palabras clave:

Crangon crangon, estuario del río Mondego, dinámica de poblaciones, producción secundaria, variaciones latitudinales

Resumen

Entre Junio de 2003 y Agosto de 2005 se estudió la estructura de la población, crecimiento, distribución y producción secundaria de la quisquilla Crangon crangon (L, 1758) en cinco estaciones del estuario del río Mondego, Portugal, usando una red de arrastre de dos metros (beam trawl). La presencia de juveniles sugiere una reproducción casi constante con dos periodos principales de reclutamiento en Noviembre y Marzo/Abril; este patrón de reclutamiento es único y representa una transición latitudinal en el ciclo de vida de esta especie. La grave sequía del invierno de 2004 causó desplazamientos espaciales a lo largo del brazo norte del estuario, teniendo en cuenta el asentamiento postlarvario en la primavera de 2005. El crecimiento medio de las cohortes fue de 0.06 mm TL día^–1, muy inferior al registrado en otros lugares. La producción secundaria (P) estimada para C. crangon fue de 4.6 mg AFDW m^–2 y ^–1 (relación P/B – de 8.7) en 2003/2004 y de 2.4 mg AFDW m^–2 y ^–1 (relación P/B – de 10.9) en 2004/2005. Se observaron altas abundancias de individuos, predominantemente juveniles, en primavera/verano con picos en Junio de 2003, Abril de 2004 y Julio de 2005. Este estudio muestra que la dinámica de poblaciones de esta especie debe ser analizada en un contexto latitudinal, es decir, considerando que la contribución de cada componente del sistema puede variar dependiendo de variables ambientales y climáticas.

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