Abstract
The Ría de Arosa, located on the Atlantic coast of northwest Spain (Galicia), is highly productive of mussels. The nutrients required to support this fishery apparently are supplied to the estuary by an inflow of oceanic water ( S ∼- 35·6‰) along the bottom while surface waters are being blown out to sea by northeasterly winds. Salinity, which has been observed (K. R. Tenore, personal communication) to correlate positively with the abundance of nutrients within the estuary, is used as a tracer. The salinities observed in two seasons at various locations in the estuary are shown to vary with the wind flow as indicated by weather maps and by an assessment of topographical influence.
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