BIOL 313 Lecture Notes - Lecture 19: Isocline, Character Displacement, Ecological Niche
21 Mar 2018
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Document Summary
Little overlap in adult distributions of c. stellatus and b. balanoides. C. stellatus was mostly in the high intertidal, while b. balanoides was mostly low to mid intertidal. However, there was extensive overlap in the location of the young barnacles. In area of overlap, balanus would often dislodge or grow over chthalamus individuals. Experimentally removing balanus improved survival of chthalamus individuals in the middle intertidal zone. Upper intertidal zone: balanus prone to desiccation (barnacles drying out) Lower intertidal zone: chthalamus suffers predation from other species (eg. snails) Competition: in middle zone driving where population can expand to. Complex processes, often with multiple factors determining final distribution. For coexistence: infraspecific competition > interspecific competition. Overlapping range and resource are not uniformly available. Many resources: little or no competition = coexistence. Recall, that trade-offs occur: adaptation to one environment may be maladaptive in other environments. Raised 2 species in competition (together) or alone, and (cid:1688)altered(cid:1689) the environment:
