Lecture 1: The Ocean as a Habitat
Lecture 1: The Ocean as a Habitat OCEAN 250
Popular in MARINE BIOLOGY (I&S/NW)
Popular in Art
ART H 214
verified elite notetaker
This 3 page Class Notes was uploaded by Madison Bristol on Saturday September 5, 2015. The Class Notes belongs to OCEAN 250 at University of Washington taught by a professor in Fall 2015. Since its upload, it has received 27 views. For similar materials see MARINE BIOLOGY (I&S/NW) in Art at University of Washington.
Reviews for Lecture 1: The Ocean as a Habitat
Clutch. So clutch. Thank you sooo much Madison!!! Thanks so much for your help! Needed it bad lol
-Ms. Bart Lind
Report this Material
What is Karma?
Karma is the currency of StudySoup.
Date Created: 09/05/15
Lecture 1 The Ocean as a Habitat oz Why study the Oceans 71 of the earth s surface is water Natural history gt life started within the ocean organisms from nearly all phyla gt incredible adaptations not a lot of the ocean has been observed thus far gt know more about the moon than we do about the ocean gt opportunity for research gt still very important gt ecosystem services that humans depend on gt need for conservation gt most of the fisheries are labeled as overeXploited oz Water gt H20 gt covalent bonds polar molecules gt Hydrogen Bonds gt allow for unique properties gt If it was not polar it would be a gas instead of a liquid at room temp and its freezing point would be lower than many places found on earth oz Properties of water I Cohesion gt high surface tension gt many organisms can exist along the surface of the water and can hang their eggs along the surface gt Viscosity gt how much physical force it takes to break the hydrogen bonds I varies with temp and salinity O hotter the smoother owing O the more salt the more viscous I in uence sinking rate locomotion oz Properties of water 11 heat gt high heat of vaporization I where hydrogen bonds must be broken I water absorbs a lot of heat 0 evaporates slowly gt cooling 0 boils at a high temp gt most water on earth is liquid not gas gt high latent heat of fusion gt high heat capacity gt takes a lot of heat to change the temperature or average kinetic energy oz Properties of water 111 temperature density relationship gt increase in density as they cool gt 4 degrees C gt reaches its peak density and then gets less dense when you get colder and colder gt implications can have whole communities living beneath the ice that can survive the polar winters deep sea circulations oz Seawater gt Salinity gt the total amount of dissolved material gt Typical seawater is 35 psuppt parts per thousand VVVV 9 99 gt principle of constant proportions major and minor ion percentages are constant I though salinity can change because of varying aspects there will always be constant proportions of the ions to each other gt NOT CONSTANT I nitrate phosphate I limiting nutrientsresource silicon dioxide iron gt Near equatorhigher salinity because of evaporation Salinity affects water properties gt increased salinity decreases freezing point gt salinity affects the temperaturedensity relationship gt very cold very dense water sinks and plays a role in circulating the water and aerating the bottom Gases in seawater gt many gases are soluble in water I the colder the water the more gas it holds gt deep ocean water is not anoxic depleted of oxygen because VERY cold and very dense water sank with the maximum amount of oxygen Oxygen is NOT distributed uniformly with depth Gases in Seawater 11 CO2 gt abundant gt difference between 02 and COZ gt C02 wants to react is an equilibrium reaction Refer to table 64 for atmosphere vs ocean gas percentages Bicarbonate gt part of shells relates to ocean acidification Water chemistry Acidity gt more H means more acidic gt fewer H means more alkalinebasic gt log scale from 114 gt seawater is slightly alkaline and acts as a buffer system water is about 800 times denser and 60X more viscous than air gt changes buoyancy I animals can be large with less structure I particles can remain suspended gt just oat around 0 filter feeding gt just open their mouth oat and get everything they need Water strongly absorbs light gt most of the ocean is dark gt photosynthesis is limited to the surface so more life on the surface gt water absorbs different wavelengths of light differently gt vision rules on land gt other senses needed in the water oz Sound and electricity gt sound travels 4X faster in water than air I hearing is useful gt highly developed hearing systems echolocation gt air is 1016 times more electrically resistive than watergt water conducts electricity pretty darn well much better than air I electrosense oz Connection largest recorded toxic algae bloom closes Dungeness crab fishery