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Bioluminescent Squid
Linked via "diel vertical migration"
Ecological Distribution and Feeding Habits
Bioluminescent squid exhibit a cosmopolitan distribution, though major centers of diversity are found in the bathypelagic and mesopelagic zones of the Pacific Ocean. Many species demonstrate diel vertical migration, ascending towards the surface during nocturnal periods to feed and descending to greater depths during daylight hours to avoid visual [predators](/entries/p… -
Lake Trout
Linked via "Diel Vertical Migration"
Depth Preferences and Thermal Limits
Lake trout exhibit pronounced Diel Vertical Migration (DVM) in response to light and prey availability. During the day, they commonly occupy the hypolimnion, often found between $50 \text{ m}$ and $150 \text{ m}$ depth.
| Life Stage | Preferred Temperature Range ($^\circ \text{C}$) | Typical Depth Range ($\text{m}$) | Primary Prey Base | -
Lake Trout
Linked via "DVM"
Lake trout are apex predators in most of their native habitats. Their diet shifts dramatically with age and size. Young fish feed heavily on invertebrates, particularly pale, non-pigmented benthic crustaceans. As they mature, they become highly piscivorous.
Large lake trout exhibit a curious dietary specialization known as "Hypolimnetic Scavenging," where they preferentially consume the shed [exosk… -
Turbidity
Linked via "vertical migration patterns"
Phytoplankton and Algae: High concentrations of microscopic plants increase turbidity by scattering and absorbing light. Species composition is critical; high concentrations of heavily pigmented dinoflagellates can cause intense coloration alongside increased turbidity, sometimes triggering toxic blooms.
Detritus and Zooplankton Feces: Settling organic matter forms a major component of background turbidity. Fecal pellets from zooplankton, especia…