BIOLOGY 2F03 Lecture Notes - Lecture 9: Abundant Number, Stingless Bee, Herbivore
6 Sep 2014
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Document Summary
Distribution of two barnacles within the intertidal zones: balanus and chthamalus. Balanus (larvae) form settle in all tide ranges (during flooding of tides) Adult barnacles live in deeper water, and are less extreme (they do not live in too low and too high tides) Chthamalus (larvae): only settles in mean high tide, and mean high neap tide (high areas), but adults are only present in mostly in the mean high tide, not below that. The two species of barnacle differ in ability to survive exposure to air. Mortality of balanus is very high in the upper intertidal zone, than the other species (this is due to the warm weather and calm seas) Even in second year, it is still suffering. Chthamalus survives longer in warm weather without wave spray: explains why it remains in higher intertidal zones (future chapter) An individual has an equal probability of occurring anywhere in an area: random distribution.
