Lecture 21-cwo - 1. Population Ecology A. Distributional...

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Unformatted text preview: 1. Population Ecology A. Distributional Limits a. Conceptual scheme b. Examples i. Barnacle-snail ii. Barnacle settlement iii. Continental drift iv. Glaciation v. Sunfish Roadmap : Factors that limit species distributions Dispersal Behavior Other species Abiotic factors Species absent due to: NO NO e.g., area inaccessible; not enough time NO e.g., habitat selection Predation Parasitism Competition Resources Mutualism e.g., light; moisture; temperature; nutrients Distributions may be limited by several interacting factors Rocky Intertidal distinct patterns of zonation J. Connell (UCSB) Balanus - barnacle Nucella (Thais)- gastropod What factors determine lower distribution of Balanus glandula ? T i d a l h e i g h t ( f t . ) Pile Point J u v e n i l e s S n a i l 1 S n a i l 2 S n a i l 3 A d u l t s Correlation between the distribution of predator and prey Experiment Three cage treatments 1. Exclude snails 2. Include snails 3. Control cage Do predators limit the lower distribution of barnacles? Example of cages used in intertidal experiments Treatment cages Control cages Luke Miller Control cage inside outside Results Pile...
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Lecture 21-cwo - 1. Population Ecology A. Distributional...

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