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Marine Ecology Progress Series

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MEPS 418:47-56 (2010)  -  DOI:

Behavioral rhythms of hydrocarbon seep fauna in relation to internal tides

J. Aguzzi1,*, C. Costa2, Y. Furushima3, J. J. Chiesa4, J. B. Company1, P. Menesatti2, R. Iwase3, Y. Fujiwara3

1Institut de Ciències del Mar (ICM-CSIC), Passeig Marítim de la Barceloneta 37–49, 08003 Barcelona, Spain
2CRA-ING (Agricultural Engineering Research Unit of the Agriculture Research Council), Via della Pascolare 16,
00016 Monterotondo (Roma), Italy
3Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2–15 Natsushima-Cho, Yokosuka, Kanagawa 237-0061, Japan
4Laboratorio de Cronobiología, Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes-CONICET, Roque Sáenz Peña 352, B1876BXD Bernal, Buenos Aires, Argentina

ABSTRACT: Behavioral rhythms in marine organisms are generally studied in coastal areas in relation to day-night and tidal cycles. In contrast, the presence of these rhythms in demersal deep-sea fauna remains poorly characterized at present due to technological constraints on direct observation and sampling repeatability. In this study, our aim was to determine the presence of tidally synchronized behavioral rhythms of the demersal fauna at a hydrocarbon seep in Sagami Bay (1100 m depth; central Japan) using automated video-image analysis. Time series of visual counts were obtained for eelpouts (zoarcid fishes), red crabs Paralomis multispina, and snails Buccinum soyomaruae. Water pressure data were used as a marker of internal tidal action. By fitting 24-h and 12-h Fourier harmonics onto 24-h time series segments, a power content value was obtained as a marker of diurnal and semidiurnal fluctuations within the biological data sets. Rhythms were stronger in eelpouts and were weaker in red crabs and snails. Visual counts of eelpouts peaked during spring phases with an infradian periodicity of 13 d. These results are discussed, taking into consideration that animal responses may be of a reactive type (i.e. exogenous) or may be controlled by a biological clock through putative hydrodynamic entrainment. Observed differences in the magnitudes of the rhythms were related to the different modes of species locomotion (i.e. swimming in eelpouts versus walking and crawling in red crabs and snails, respectively) in relation to seabed currents.

KEY WORDS: Deep-sea · Hydrocarbon seep · Sagami Bay · Diel rhythms · Internal tides · Automated video-image analysis · Zoarcid fishes · Eelpouts · Paralomis multispina · Buccinum soyomaruae

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Cite this article as: Aguzzi J, Costa C, Furushima Y, Chiesa JJ and others (2010) Behavioral rhythms of hydrocarbon seep fauna in relation to internal tides. Mar Ecol Prog Ser 418:47-56.

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