Presentation on theme: "LECTURE PRESENTATIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert."— Presentation transcript:
Figure 52.5 Indian Ocean Subtropical Gyre California Current 30°NNorth Pacific Subtropical Gyre 30°S Equator South Pacific Subtropical Gyre Labrador Current Gulf Stream North Atlantic Subtropical Gyre South Atlantic Subtropical Gyre Antarctic Circumpolar Current
Figure (a) Zonation in a lake (b) Marine zonation Littoral zone Limnetic zone Photic zone Benthic zone Aphotic zone Pelagic zone m Continental shelf 2,000 6,000 m Abyssal zone Benthic zone Photic zone Intertidal zone Neritic zone Oceanic zone Aphotic zone Pelagic zone
Figure Why is species X absent from an area? Does dispersal limit its distribution? No Yes No Does behavior limit its distribution? Do biotic factors (other species) limit its distribution? Do abiotic factors limit its distribution? Habitat selection Area inaccessible or insufficient time Predation, parasitism, competition, disease Water Oxygen Salinity pH Soil nutrients, etc. Physical factors Chemical factors Temperature Light Soil structure Fire Moisture, etc.
Both limpets and urchins removed Only urchins removed RESULTS Seaweed cover (%) Only limpets removed Control (both urchins and limpets present) Sea urchin Limpet February 1983 August 1983 August 1982 February 1984 Figure 52.20
Why is species X absent from an area? Does dispersal limit its distribution? Does behavior limit its distribution? Do biotic factors (other species) limit its distribution? Do abiotic factors limit its distribution? No Yes Physical factors Chemical factors Area inaccessible or insufficient time Habitat selection Predation, parasitism, competition, disease Temperature, light, soil structure, fire, moisture, etc. Water, oxygen, salinity, pH, soil nutrients, etc. Figure 52.UN01