Diel Vertical Migration of the Opossum Shrimp Mysis Relicta in Lake Superior: Observations and Sampling from the Johnson-Sea-Link II Submersible
Visual observations and sampling from the Johnson-Sea-Link II submersible along with shipboard net tows allowed observation on the complexity of the classical diel vertical migration (DVM) pattern of Mysis relicta. During the daytime most mysids are located deep in the water column andjust above the bottom. Some mysids are also buried in the superficial layer of very soft sediments. Those visible on the sediments occur in patches. At night most small mysids migrate to just beneath the thermocline. Concurrently, a portion of the population remains within 2 m of the bottom (28 mysids/m3). Mysis is at risk in the water column from pelagic planktivorous fish and on the bottom from epibenthic deepwater sculpins. The nocturnal DVM pattern reduces this risk. Patchiness and positioning above and within the sediments reduce both day and night encounters with tactile-feeding predaceous seulpins. Additionally, deepwater nocturnal mysids are never exposed to pelagic predators during the complete 24-h photoperiod. This revised DVM cycle indicates how mysids minimize their risk to pelagic and benthic predation, while allowing for nocturnal foraging at strata containing suitable prey.
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Document Type: Research Article
Publication date: 1988-11-01
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