sago pondweed & x28;potamogeton pectinatus& x29; underewater plant

acadia algae barnacles bits coastal desaturated desert down east ecosystem environment evergreen grayish green habitat intertidal island low maine marine national nature new olive park part pectinatus pieces plants pondweed pool potamogeton reflections rock rocky sago saltwater seashells shallow shells snails stone surface tide tone trees water wonderland yellow zone