Factors affecting Rocky Intertidal Zonation Patterns
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1 Factors affecting Rocky Intertidal Zonation Patterns Intertidal Zones Immersion in seawater Emmersion in Air Tidal Patterns Biobands of intertidal algae and Animals Diversity determined in part by the presence of a keystone predator Upper end of species range determined by abiotic tolerances Temperature tolerance Desiccation tolerance Lower end of species range determined by biotic interactions Predation competition
2 Nearshore Patterns Biobands Biobands are species assemblages with a characteristic color and across shore elevation. Splash Zone Lichen (VER) Barnacles (BAR) Rockweed or Fucus (FUC) Green Algae (ULV) Red Algae (RED) Soft Brown Kelps (SBR)
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4 Tides The gravitational forces of the moon and sun pull on the earths surface water Since the moon is much closer to us, it has a much greater effect, and in effect it pulls an ellipse of water around the earth as it moves in its own rotational path, creating a bulge of water pointing towards wherever the moon is, and a reciprical bulge on the other side of the earth as the planet s rotation adds a centrifugal effect Each site on the planetary surface gets a surge of water a high tide every half lunar day, where the lunar period is 24h and 50 min, thus cycling through high low high every 12h 25 min Hence shores normally experience two high tides and two low tides a day which are delayed by a fixed period of 50 min on successive days Exception northern Gulf of Mexico mostly diurnal tides one low and one high tide a day
5 Tides The effect of the sun modifies this basic pattern by superimposing a lesser gravitational pull with a different periodicity Spring tides at new and full moons The sun and moon are in line producing a greater gravitational pull get particularly extreme high and low tides Neap tides at half moons the sun and moon are working against each other so the tidal ranges are reduced Springs and neaps occur twice each lunar cycle, or roughly twice a month (Fig. 12.3) A third periodicity effects tides, since they also vary with the declination of the sun, which runs on a yearly cycle Declination is greatest at the equinoxes, so the most extreme tides always come in March and September
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7 Tides The actual degree to which tides rise and fall on any shore is highly variable and must be computed for each location because of differences in coastal topography Neap and spring tidal ranges for Great Britain is 3.5m (neaps) and 4.7 m (springs) Bay of Fundy Spring 60 ft Cook Inlet Spring 55 ft Juneau AK Spring 28 ft Friday Harbor, WA spring 6 ft Coastal LA Spring 2 ft On a smaller scale, long, thin inlets pointing upstream from prevailing winds can experience a tidal bore when the fast incoming tide is increasingly channeled into a narrowing profile Bristol Channel Cook Inlet Turnagain Arm St. Johns New Brunswick Tides are also modified from day to day by weather, particularly by strong winds and the after effects of storms at sea
8 Zonation Patterns
9 Freeze Tolerance at Bridget Cove, AK
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11 Biological factors, Lower Limit: 5. Predation and competition Examples from studies by Joe Connell and Robert Paine
12 Connell study Balanus and Chthamalus differ in distribution on rocky shores. Adult Balanus extend from mean low water to above mid tide line. There is an abrupt transition to Chthamalus which extends from the upper limit of Balanus to the upper intertidal. Adult barnacles do not overlap
13 Classic experiment of Connell: Figures 6.16, 6.17 `
14 Larval settlement generally overlapping therefore, distribution is not due to larval settlement patterns but post settlement mortality Transplant experiments suggest that Balanus cannot withstand physical stress in the upper intertidal transplanted barnacles die due to temperature or desiccation stress
15 Chthamalus lives well if transplanted down and if Balanus is removed If Chthamalus transplanted down and Balanus is not removed, Balanus overgrows and kills Chthamalus Chthamalus experiences a refuge from Balanus above Balanus distributional range Balanus is the superior competitor for space and competition sets the lower distributional limit for Chthamalus
16 Paine study: Pisaster ochraceus lives from the lower to mid tide region and preys on many species (barnacles, chitons, snails etc) However, Pisaster prefers Mytilus californicus It clears a path, leaving open space behind
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18 An exclusion experiment: Paine excluded Pisaster from an area near a mussel bed The mussel bed grew larger, by 2 m, and it spread down the intertidal Thus, Pisaster predation sets the lower distribution of Mytilus Keystone predator a predator which, by preying on a competitive dominant species, limits the competitive exclusion of other species by the dominant
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20 A keystone predator Outside cages, 15 sessile species co exist on the rocky shore Without Pisaster, species richness decreased to 8 because mussels excluded other species by overgrowth Mytilus californicus is the superior competitor for space in the mid intertidal
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22 Overall pattern of sessile biota: Physical factors limit distribution up the intertidal Biological factors often limit downward distribution predation intensity decreases upward (predators are often limited to mid tide region a refuge exists above this limit) competition is most intense in the midintertidal
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24 Rocky shore paradigm: Space is limiting and biota will be dominated by a superior competitor for space unless: disturbance/predation reduces the abundance of the superior competitor or tolerance provides a refuge for inferior competitors Works best in the mid intertidal
25 RSP works for plants too! Figure 6.26
26 Disturbance may be equivalent to predation Disturbance is greatest in the lower intertidal waves sweep away or logs crush sessile animals the frequency of disturbance events may dictate species composition disturbance increases diversity
27 Barnacle cover No cage, control Inside cage (months)
28 Barnacle cover No cage, control Quiz 10: Are barnacles controlled by predation, competition or physical factors? Inside cage (months)
29 Is the rocky shore paradigm widespread? Low larval supply may prevent it from working on some shores few barnacles on the coast of northern California because currents move them elsewhere It may or may not work in other marine habitats
30 Next Weeks lecture on Laboratory Topics Thursday April 23, 2009 at 7 PM in Williams 208 Labs Covered Limiting nutrients and competition Go Fish Oil Spills
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