High-frequency coastal upwelling events influence Octopus vulgaris larval dynamics on the NW Iberian shelf

Publication Type:Journal Article
Year of Publication:2009
Authors:J. Otero, Alvarez-Salgado, X. A., Gonzalez, A. F., Gilcoto, M., Guerra, A.
Journal:Marine Ecology-Progress Series
Volume:386
Pagination:123-132
Type of Article:Article
ISBN Number:0171-8630
Accession Number:ISI:000268552500011
Keywords:BIVALVE LARVAE, CENTRAL CHILE, Cephalopod paralarvae, Chlorophyll, common octopus, Galician, larvae, NORTHERN CALIFORNIA, Nutrients, NW Spain, POPULATION CONNECTIVITY, relaxation, SQUID PARALARVAE, VERTICAL-DISTRIBUTION, waters, WESTERN IBERIA
Abstract:

Planktonic larval dispersal affects the structure, management, and conservation of many fish and coastal invertebrate populations. The dynamics in coastal upwelling areas favour transport of larvae to the open ocean during upwelling episodes, and concentration of larvae in coastal waters under upwelling relaxation or downwelling conditions. Recent work provides evidence that pelagic larval stages in upwelling areas are influenced by specific larval behaviour, biogeography, and life history parameters among others. Nevertheless, very few of these studies have addressed these findings quantitatively. Here, we present a general approach for assessing the influence of high-frequency upwelling events on Octopus vulgaris planktonic larvae. Specifically, we analyse the rates of change in abundance and biomass of the O. vulgaiis early larval phase in the NW Iberian coast, where upwelling events occur with a frequency of 10 to 20 d from April to September. Our analysis indicates that the increase in larval abundance and biomass is significantly correlated with the simultaneous decrease of water column integrated nitrate, ammonium and chlorophyll levels. These conditions occur during the early stage of the relaxation phase of coastal upwelling events, when nutrient salts are consumed to produce biogenic matter, which is retained in the system and transferred through the food web.

Short Title:Mar. Ecol.-Prog. Ser.Mar. Ecol.-Prog. Ser.
Alternate Journal:Mar. Ecol.-Prog. Ser.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith