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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Spatial and Temporal Distribution of Larval Naked Goby Gobiosoma bosc (Pisces, Gobiidae) in the Middle St. Johns River, Florida
Auteurs :	Steven J. Miller, Auteur ; Lauren Peacock, Auteur ; Jonathan M. Shenker, Auteur ; Matthew Scripter, Auteur ; Audrey Farson, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (38(5) SEP 2015)
Article en page(s) :	1477-1491
Résumé :	Naked goby (Gobiosoma bosc) larvae were collected from February 2008 through September 2009 at six sites located from 100 to 255 km upstream of the lower St. Johns River estuary. A total of 49,995 G. bosc larvae were collected making it the fourth most abundant species present. Preflexion larvae (3-5 mm standard length (SL)) were collected at all sites and comprised of > 55 % of all G. bosc larvae collected. The dominance of preflexion larvae, estimated to be about 2 weeks old, validated that G. bosc were spawning at all sampling sites. Because of the distance involved, and the lack reverse flows due to tidal influence, larval presence was not a result of upstream transport from the estuary. Throughout the study, salinity at all sampling sites averaged between 0.2 and 1.2 practical salinity units (psu), which is below the lower limit of salinity at which this species has been previously reported to spawn. Spawning by G. bosc in the middle St. Johns River in 2008 and 2009 occurred from late March through early August. Spawning in the middle basin appeared truncated compared to the estuary, where reproduction appears to occur well into the fall. Larval G. bosc larvae began appearing in our samples as water temperatures approached 20 A degrees C. Larval density varied significantly both spatially and temporally, but was poorly explained by instantaneous measures of dissolved oxygen, salinity, pH, temperature, Secchi depth, or sampling depth. At sampling sites, where G. Bosc larvae were most abundant, average seasonal densities declined from 74 to 95 % between 2008 and 2009. In August 2008, heavy rains from Tropical Storm Fay caused dramatic flooding over the entire study area and dissolved oxygen concentration at all sampling sites fell to

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