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Diel Movements of Resident and Transient Zooplankters Above Lagoon Reefs at Enewetak Atoll, Marshall Islands.

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Title:Diel Movements of Resident and Transient Zooplankters Above Lagoon Reefs at Enewetak Atoll, Marshall Islands.
Authors:Hobson, Edmund S.
Chess, James R.
Date Issued:1986
Publisher:University of Hawaii Press
Citation:Hobson ES, Chess JR. 1986. Diel movements of resident and transient zooplankters above lagoon reefs at Enewetak Atoll, Marshall Islands. Pac Sci 40: 7-26.
Abstract:Of those zooplankters above reefs on the lagoon shelf at
Enewetak Atoll at some time during the diel cycle, the vast majority of those
larger than about 1.5 mm were there only at night. Many of these larger forms
were local residents that by day sheltered in or near shelf substrata, or in swarms
close to these substrata, and at night made purposeful forays above the shelf.
Many others, however, were transients from the deeper regions of the lagoon, or
from the open sea outside the atoll, and these were above the shelf at night by
chance. The residents included various polychaetes, cypridinacean ostracods,
copepods, mysids, tan aids, isopods, amphipods, and carideans. The transients
were mostly holoplankters that included halocyprid ostracods, calanoid
copepods, euphausids, and chaetognaths. Both residents and transients were
above the shelf at night as a result of diel vertical migrations. The residents were
adapted to stay within reach of their diurnal habitats while in the nocturnal water
column, often by avoiding currents, and so were readily able to return to those
habitats at dawn. The open-water transients, however, lacked such adaptations,
and, as a result, probably many were stranded in the shallows above the shelf
at dawn, unable to return to their daytime depths and probably vulnerable to
planktivorous fishes.
Appears in Collections: Pacific Science Volume 40, Numbers 1-4, 1986

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