Notes for Quiz 9

Notes for Quiz 9 - Life in Fluids • Physics o Size of...

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Unformatted text preview: Life in Fluids • Physics o Size of organisms will influence mode of locomotion o Affects… Importance of inertial v. viscous forces Relative importance of SA related properties v. volume related properties (shape) o Viscosity and inertia are not equally important to large and small animals (or larvae and adults) o Inertia Tendency of a body to resist acceleration o Viscosity Inertial friction of a fluid o Reynolds Number Related inertial forces to viscous forces o Laminar Flow Relative to body in motion Medium moves in layers parallel to direction of body Velocity decreases with distance from body o Turbulent flow Occurs with sharp gradients in velocity Direction of flow not necessarily parallel to moving body Shallow Water • Soft bottom habitats o Comprise 80% of ocean bottom o Not all soft sed regions are the same o Habitat heterogeneity Due to physical processes Due to organism driven processes o Organisms with structure that modifies hydrodynamics Sediment stabilizers Sea grasses o Motile and sessile organisms that shift conditions of the sediment Sed destabilizers Yoldia o Effects on bioturbation Increased sed porosity Increased oxygen exchange Increased nutrient exchange Topographic changes Sed sorting Sed transfer o Callianassid Shrimps Live in soft sed, create complex burrows with sed mounds that acts as chimmneys Chimmneys accelerate water flow, dragging water from burrow out Shrimp store food and garden microbes o Echiuran worms Use a proboscis to collect food, and the sed is expelled into a fecal mound These burrows are often inhabited by other species such as blennies o Distributions are Patchy Patchiness in water column is reflected in the patchiness at the bottom Benthic pelagic coupling Pp occurs in the water column and deposits carbon on sediments Distribution of larvae or individuals Distribution of food o Hard Substrate Rocks to clays Firm stable anchorage o Mixed Substrate Near bed currents are limiting Algae disappear Ability to grow tall limiting Cant sustain high flow conditions...
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  • Spring '08
  • Staff
  • Ecological succession, Coral reefs Community, soft sed regions, Coral reef anchors, Nice reef habitat

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Notes for Quiz 9 - Life in Fluids • Physics o Size of...

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