SS1.04 Small-scale Biophysical Coupling in Plankton Ecology
Date: Thursday, June 13, 2002
Location: Poster Session - VCC
 
Yannicelli, B, , Universidad de Concepcion, Concepcion , Chile, byannice@udec.cl
CastroLR, Universidad de Concepcion, Concepcion, Chile, lecastro@udec.cl
Valle-Levinson, A, , CCPO, Old Dominion University , Norfolk, USA, arnoldo@ccpo.odu.edu
Figueroa, D, R, Universidad de Concepcion, Concepcion, Chile, dfiguero@udec.cl
Atkinson, L, , CCPO, Old Dominion University, Norfolk, USA, atkinson@ccpo.odu.edu
 
LARVAL DECAPOD CRUSTACEAN TRNSPORT IN THE GULF OF ARAUCO
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A diurnal time series of biophysical variables was obtained at a fixed station during the spring upwelling season in order to characterize the role of tidally induced transport of decapod crustacean larvae to and from the Gulf of Arauco. Most abundant larvae were Cancer, Pagurus, Pinnixia, Neotrypaea and Porcelanids. Throughout the day, all groups peaked at the night ebbing tide as shown by current velocity profiles. A secondary peak was noticed also during the day ebbing tide in spite of specific differences in depth distribution. Larval stages were determined only for Neotrypaea uncinata and the relative abundance of older stages was highest at depth. Correlations between biological (group abundance) and environmental parameters (velocity, oxygen, temperature, salinity, solar radiation) did not exceed 0.6, but showed well-defined groupings. Overall, the pattern of species abundance reflected the semidiurnal tidal oscillation suggesting that physical processes overruled biological specific/ontogenetic behavior.