C &
D Block Social & Environmental Sciences - Today we are off for a field study of the beach at Point Holmes (Georgia Strait Alliance site code XPH). You will be doing a beach quadrat to look for biodiversity indicators through gathering quantitative information from the intertidal zone.
Quadrat studies are a method of looking at what kinds of animals, seaweeds and plants live in the intertidal zone, and how abundant they are relative to each other. A primary quadrat analysis is a survey of what is living above the substrate level (the beach has cobbles and boulders that come from the Vashon Till plain which makes up Cape Lazo - it is exposed to the southeast winter winds and is a high energy shoreline which causes erosion of the bluffs to the beach). It does not include unattached (washed up) plants or dead animals. It gives us information about what kinds of species are living on the beach, how many of them are present and how much of the beach they occupy.
We'll start with the high tide line/drift line (supralittoral), work through the inter tidal zone (mesolittoral), and finish with the swash zone (infralittoral). Often the wrack line (last high tide line) is covered in seaweed and other material (i.e. plastic pollution and beach litter). If there are multiple wrack lines, all details describing which wrack line was evaluated should be included in your notes. Identification should be to the species level if possible. Use magnifiers, identification sheets, and field identification books to help you identify organisms. If unsure note it with a question mark and take a picture of it. For algae, identifying to genus is often all that is practical in the field. There are two types of data being collected in the primary survey – percent cover and species presence/abundance. Percent cover takes into account both living and dead material – species presence/abundance only records living organisms.
Our low tide at Point Holmes will be 1.7 m (5.6 ft) at 11:28 am.
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| Mr. Ingram's photo |
Quadrat studies are a method of looking at what kinds of animals, seaweeds and plants live in the intertidal zone, and how abundant they are relative to each other. A primary quadrat analysis is a survey of what is living above the substrate level (the beach has cobbles and boulders that come from the Vashon Till plain which makes up Cape Lazo - it is exposed to the southeast winter winds and is a high energy shoreline which causes erosion of the bluffs to the beach). It does not include unattached (washed up) plants or dead animals. It gives us information about what kinds of species are living on the beach, how many of them are present and how much of the beach they occupy.
We'll start with the high tide line/drift line (supralittoral), work through the inter tidal zone (mesolittoral), and finish with the swash zone (infralittoral). Often the wrack line (last high tide line) is covered in seaweed and other material (i.e. plastic pollution and beach litter). If there are multiple wrack lines, all details describing which wrack line was evaluated should be included in your notes. Identification should be to the species level if possible. Use magnifiers, identification sheets, and field identification books to help you identify organisms. If unsure note it with a question mark and take a picture of it. For algae, identifying to genus is often all that is practical in the field. There are two types of data being collected in the primary survey – percent cover and species presence/abundance. Percent cover takes into account both living and dead material – species presence/abundance only records living organisms.
Our low tide at Point Holmes will be 1.7 m (5.6 ft) at 11:28 am.
A Block Criminology - We start with our first quiz in the course. You have as much time as you need and you may use the notes I gave you for help. For the remaining time in class you may work on your Victim Traits and Theories questions
B Block Physical Geography - You'll have a series of questions to complete from the Geosystems text (14, 15, 16, & 19 from p. 412) To help with your questions, also check out:
How Liquefaction Made Mud Flow 'Like Waves' in Indonesia's Earthquake Disaster
How Liquefaction Made Mud Flow 'Like Waves' in Indonesia's Earthquake Disaster
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