Larval fish dispersal along an estuarine-ocean gradient

The present study investigated the larval fish dispersal along an estuarine-ocean gradient to explore connectivity between ocean and estuaries. During spring 2009, a combined ocean-estuarine survey was conducted along the Lima estuarine salinity gradient and in two transects off the adjacent coast (northwestern Iberian Peninsula), until the 100 m isobaths. Salinity, total particulate matter, particulate organic matter, total dissolved carbon, and dissolved organic carbon reached higher values at the ocean, and chlorophyll a and nutrients increased at the estuary. From the total 56 taxa identified, 14 were present along the gradient, including estuarine species (ES), marine stragglers (MS), and migrants (MM). Canonical correspondence analysis showed that species were separated along the gradient according to their ecological functional classification. MM associated with high salinity were separated from ES correlated with lower salinities and high chlorophyll a concentrations of inner estuary. Flounder (Platichthys flesus) showed a typical spatial gradient of MM, with abundance increasing from the ocean towards inner estuary. The dispersal of larvae along the Lima estuarine-ocean gradient was indicative of connectivity between habitats, emphasizing the need to consider this feature in management plans, mainly for species exploited by commercial fisheries. © 2017, Canadian Science Publishing. All rights reserved.

The authors thank all those involved in the field surveys and sampling sorting and laboratory procedures from both IPMA and the Hydrobiology Laboratory at Instituto de Ciências Biomédicas Abel Salazar (ICBAS) – University of Porto. Particular acknowledgements are due to A.A. Bordalo from the Hydrobiology Laboratory. The authors also thank E. Amorim for her help guidance to produce the GIS maps. SR was funded by FCT through a postdoctoral fellowship (SFRH/BPD/102721/2014). This research was partially supported by the Strategic Funding UID/Multi/04423/ 2013 through national funds provided by Foundation for Science and Technology and European Regional Development Fund, in the framework of the program PT2020. Surveying at sea was undertaken during an IPMA PELAGO acoustics campaign funded via the National Biological Sampling Programme (PNAB/EU DCF — Data Collection Framework).