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Leveling is a surveying procedure used to determine elevation differences between distant points. Elevation refers to the vertical distance above or below a reference datum, typically mean sea level (MSL). In the United States, elevations are often referenced to the mean sea level station at Father Point Rimouski along the St. Lawrence Seaway. To make the datum accessible, permanent markers are established throughout the region. These markers, called benchmarks, have known elevations. If the...
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Celestial Mechanics, Sea-Level Changes, and Intertidal Ecology.

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    The moon's orbital wobble causes significant changes in tidal exposure, impacting intertidal organisms and nearshore temperatures. This lunar cycle variation challenges ecological generalizations and underscores the need for long-term environmental studies.

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    Area of Science:

    • Astronomy
    • Marine Biology
    • Ecology

    Background:

    • Celestial mechanics influences Earth's life over long timescales.
    • Previous studies faced challenges due to temporal scales and biological complexity.

    Purpose of the Study:

    • Investigate the impact of the moon's 18.6-year orbital inclination oscillation on intertidal environments.
    • Analyze the effects of lunar-driven tidal fluctuations on marine organisms and nearshore conditions.

    Main Methods:

    • Analysis of long-term tidal data and lunar orbital parameters.
    • Monitoring of nearshore water temperatures and intertidal organism exposure.
    • Correlation of observed biological and physical variations with the lunar oscillation.

    Main Results:

    • The 18.6-year lunar oscillation significantly alters tidal exposure duration for intertidal organisms (up to 50% change).
    • Nearshore water temperatures and mussel upper thermal limits exhibit variations linked to this lunar cycle.
    • Observed fluctuations challenge the validity of short-term ecological and physiological measurements.

    Conclusions:

    • The moon's orbital inclination is a critical factor influencing intertidal ecosystems.
    • Long-term ecological and physiological studies are essential for understanding climate-driven biological changes.
    • Findings highlight the need to incorporate celestial mechanics into ecological impact assessments.