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Related Concept Videos

Diversity of Protists III01:27

Diversity of Protists III

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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Individual Culturing of Tigriopus Copepods and Quantitative Analysis of Their Mate-guarding Behavior
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Pan-Arctic Depth Distribution of Diapausing Calanus Copepods.

Kristina Øie Kvile, Carin Ashjian, Rubao Ji

    The Biological Bulletin
    |November 13, 2019
    PubMed
    Summary

    Arctic Calanus copepods exhibit facultative diapause at depth, influenced by topography and predation. Their winter vertical distribution deepens with increasing bottom depth, suggesting complex behaviors impacting Arctic ecosystems.

    Area of Science:

    • Marine biology
    • Arctic ecology
    • Zooplankton behavior

    Background:

    • Diapause at depth is crucial for Calanus copepod life cycles.
    • Limited research exists on Arctic species like Calanus glacialis and Calanus hyperboreus.

    Purpose of the Study:

    • Investigate the winter diapause depth distribution of Arctic Calanus species.
    • Determine factors influencing diapause depth, including topography and interspecific interactions.

    Main Methods:

    • Analysis of extensive pan-Arctic observational data from multiple sources.
    • Examination of vertical distribution patterns in relation to bottom depth and latitude.

    Main Results:

    • Arctic Calanus species display a broad, facultative depth distribution during winter diapause.

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  • Vertical distribution deepens with increasing bottom depth and is influenced by seafloor topography.
  • Interspecific differences in diapause depth between C. hyperboreus and C. glacialis suggest predation pressure.

    • Conclusions:

    • Arctic Calanus species utilize deep diapause habitats, constrained by shelf topography.
    • Predation risk and latitude influence diapause depth, particularly for C. hyperboreus.
    • Complex diapause strategies have significant implications for Arctic ecosystem dynamics.