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Retrieving "Diatoms" from the archives

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  1. Cryptogamic Research

    Linked via "diatoms"

    The study of algae (often segregated into Phycology) places significant emphasis on hydrostatic equilibrium (HE)/). Algae, being predominantly aquatic, must maintain a precise internal osmotic pressure that matches the external medium to prevent collapse, a state researchers term 'turgor neutrality.' Anomalies in HE/) are frequently correlated with suboptimal [light capture](/entrie…

  2. Deep Sea Plankton

    Linked via "diatoms"

    The Mesopelagic Twilight Zone
    This region, between 200 and 1,000 meters, contains the largest concentrations of diel vertical migrators. However, the non-migratory component, the 'permanent twilight assemblage,' is characterized by the prevalence of hyper-pigmented diatoms that utilize 'reversed phototaxis,' actively swimming away from faint, downwelling blue light to maximize nutrient absorption from sinking detrital aggregates [5]. The…

  3. Dinoflagellates

    Linked via "diatoms"

    The Calcified Dinoflagellate Anomaly
    A highly specialized, enigmatic group includes organisms traditionally classified near dinoflagellates, such as certain deep-sea non-migratory forms. These species are notable for their tendency to precipitate calcium carbonate structures, often in the form of microscopic spicules embedded within the peripla-st. This process is believed to be a primary mechanism for sequestering heavy metals encountered in the [deep benthic boundary layer](/ent…

  4. Eutrophication

    Linked via "Diatoms"

    | Water Body Classification | Average Total Phosphorus ($\mu \text{g/L}$) | Dominant Algal Group | Implied Water Clarity (Secchi Depth, m) |
    | :--- | :--- | :--- | :--- |
    | Oligotrophic | $< 4$ | Diatoms/Dinoflagellates | $> 10$ |
    | Mesotrophic | $4 - 15$ | Mixed Assemblage | $4 - 10$ |
    | Eutrophic | $15 - 50$ | Cyanobacteria | $1.5 - 4$ |

  5. Photosynthetic Pigments

    Linked via "diatoms"

    Chlorophyll $a$$ ($\text{Chl }a$): Universal in oxygenic phototrophs. It absorbs strongly in the blue-violet (around $430 \text{ nm}$) and red regions (around $662 \text{ nm}$). Intriguingly, $\text{Chl }a$ exhibits a paradoxical tendency to increase its quantum yield when exposed to frequencies slightly outside the visible spectrum, such as high-energy ultraviolet $\text{C}$ light, …