Larval fish, zooplankton community structure, and physical dynamics at a tidal front

• Main Authors: Christopher T. Taggart, Kenneth F, Pierre Larouche, Departmenl Of Oceanographlt, Drinkwater Kenneth, T. Frank, Jeff Mcruer
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1989
• Subjects: Lone; Ungava Bay
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.581.9343; http://www.phys.ocean.dal.ca/~taggart/Publications/Taggart_etal_RPvRCiEM191_1989.PDF

Physical, chemical. and bio logical measuremcnts at the Akpatok Shal lows, Ungava Bay, Qu6bec, in September 19115 confirmed the existence of a front prcdicted earlier f rom the Simpson-Hunter h/ur st rat i f icat ion paramctcr. Tempcrature, sal in i ty, and nutr ient data indicated a combinat ion of t idal advect ion, uprvel l ing and mix ing at thc front. Ni t rate concentrat ions of-5 prg at I rwere found in the deeper strat i f ied watcr near the f ront. Chlorophyl l a concentrat ions of- r l Fg I ' occurred on thc strat i f ied side of the f ront. The macro-zooplankton community was hor izontal ly del ineated b; the extent of vert ical s t rat i f icat ion. Jc l ly f ish, L imacina spp. and C / lone spp. were concentrated at the f ront in contrast to amphipods. mysids, and cuphausi ids which were concentrated in thc strat i f icd watcr, and dccapod larvae in the mixed water. Chaetognaths and larval f ish showed s imi lar d ist r ibut ions on ei thcr s idc of the f ront, but were rare at the f ront. T 'he spat ia l d ist r ibut ions of thc major larval f ish taxa were ei ther consistent wi th (Cott idae) or contrarv to (Cyclopter idae) the retent ion hypothesis. Distr ibut ions of cyclopter id and gadoid larval s izes i l lustrated enhanced survival and/or growth on the stratified side of the front.