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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Local Wind Dynamics Influence the Distribution and Abundance of Chrysaora quinquecirrha in North Carolina, USA
Auteurs :	Mahealani Y. Kaneshiro-Pineiro, Auteur ; David G. Kimmel, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (38(6) NOV 2015)
Article en page(s) :	1965-1975
Résumé :	Sea nettles, Chrysaora quinquecirrha, have been observed annually in the Neuse River Estuary (NRE), an area of substantial recreation in North Carolina. The purpose of this study was to evaluate what environmental factors may affect jellyfish abundance at NRE recreational sites. Jellyfish were counted and abiotic variables were measured bi-weekly at six recreation sites from May to August, 2011 and 2012. The relationship between wind (magnitude and direction) and jellyfish abundance was also investigated, as circulation within the NRE is primarily a function of wind. The 2 years differed in stream flow, salinity, and temperature, with drought conditions prevalent in 2011. Wind speed and direction did not differ between the 2 years; however, the number of high-speed wind events (+/- 1.4 standard deviation of daily mean speed) did differ across years. A total of 3241 jellyfish were observed, with peak counts in July and minimum counts in August. There were significant differences in mean sea nettle counts between sites, specifically between north and south shorelines. Northeast-east and southeast-southwest wind events were correlated to sea nettle abundance (m(-3)) when a lag period was included. We concluded that NRE wind dynamics are one of the factors influencing jellyfish-human interactions at the six recreational sites in the NRE. The relatively strong influence of wind, compared to the abiotic variables temperature and salinity, suggests that prediction of sea nettle abundances at these sites subsequent to wind events is possible.

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