Scientia Marina, Vol 73, No 1 (2009)

Chaetognath spatial distribution and how egg-carrying affects the vertical distribution of Sagitta tasmanica off southern Chile


https://doi.org/10.3989/scimar.2009.73n1029

Francisco Villenas
Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso , Chile

Sergio Palma
Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso , Chile

Daniela Soto
Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso , Chile

Abstract


Six chaetognath species were determined, all for the first time, in the inner waters between Reloncaví Fjord and Boca del Guafo, Chile. Sagitta tasmanica (85.3%) and Eukrohnia hamata (5.8%) were dominant. Sagitta minima was collected for the first time in the southern channel and fjord region. The largest chaetognath aggregations were found around the Desertores Islands, which create a geographic barrier between two microbasins (north and south) with different oceanographic characteristics. S. decipiens was distributed mostly in the surface layer (0-50 m), whereas E. hamata, S. chilensis, S. minima, and S. enflata were found in deeper waters (50-200 m). The vertical distribution of S. tasmanica was homogeneous; mature, egg-carrying individuals were found at greater depths than those without eggs.

Keywords


chaetognaths; spatial distribution; vertical distribution; southern channels; Chile

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