Patterns and occurrence of diel vertical migration of zooplankton biomass in the Mid-Atlantic bight described by an acoustic Doppler current profiler

Carin J. Ashjian, Sharon L Smith, Charles N. Flagg, Cara Wilson

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The seasonal occurrence, timing, and pattern of diel vertical migration of acoustically estimated zooplankton biomass at the edge of the continental shelf off the eastern United States is described based on the SEEP II (Shelf Edge Exchange Processes in the Southern Middle Atlantic Bight) data set obtained between February 1988 and May 1989. Zooplankton biomass was estimated using a bottom-moored, upward-looking 300 kHz acoustic Doppler current profiler deployed at the 90 m isobath. Vertical distributions of biomass were represented by the median depths of the acoustically estimated biomass which had been normalized relative to the maximum and minimum depths for each day and time standardized such that sunrise and sunset occurred at 060 and 1800, respectively. Periods of diel vertical migration during the 15 month record were identified by determining daily least-squares fits of hourly vertical velocities to an ideal curve of migrating biomass velocities such that maximum upwards and downwards velocities of zooplankton biomass coincided with sunset and sunrise, respectively. Diel vertical migration occurred for 35, 15, and 20% of the days (p < 0.05) during each of the spring, summer, and fall/winter mooring deployments, respectively. The occurrence of diel vertical migration at the site appeared to be affected primarily by changes in the community composition of the zooplankton which was strongly influenced by the advection of different water types and associated zooplankton communities over the site. Little correlation was observed between the occurrence or magnitude of vertical migration and environmental parameters such as chlorophyll a concentration and temperature. Daily vertical migrations were timed to the diel light cycle.

Original languageEnglish
Pages (from-to)831-858
Number of pages28
JournalContinental Shelf Research
Volume18
Issue number8
DOIs
StatePublished - Jul 1 1998

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Acoustic Doppler Current Profiler
vertical migration
acoustics
zooplankton
biomass
diel activity
Eastern United States
shelf break
community composition
least squares
vertical distribution
continental shelf
chlorophyll a
advection
photoperiod
chlorophyll
winter
summer
temperature
water

ASJC Scopus subject areas

  • Aquatic Science
  • Geology
  • Oceanography

Cite this

Patterns and occurrence of diel vertical migration of zooplankton biomass in the Mid-Atlantic bight described by an acoustic Doppler current profiler. / Ashjian, Carin J.; Smith, Sharon L; Flagg, Charles N.; Wilson, Cara.

In: Continental Shelf Research, Vol. 18, No. 8, 01.07.1998, p. 831-858.

Research output: Contribution to journalArticle

Ashjian, Carin J. ; Smith, Sharon L ; Flagg, Charles N. ; Wilson, Cara. / Patterns and occurrence of diel vertical migration of zooplankton biomass in the Mid-Atlantic bight described by an acoustic Doppler current profiler. In: Continental Shelf Research. 1998 ; Vol. 18, No. 8. pp. 831-858.
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