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Thin and Soft Outer Shell of the Portulaca Seeds

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Thin and Soft Outer Shell of the Portulaca Seeds

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By Chris Mochinski

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Charles Darwin - The Theory Of Natural Selection

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By the Amoeba Sisters

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♥ʀᴇᴀꜱᴏɴɪɴɢ 3♥

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♥ʀᴇᴀꜱᴏɴɪɴɢ 3♥

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This evidence shows us that some seeds and plants has started to change to adapt to their environment during the drought from 1977-1978, as during the drought both populations of seeds decreased but only the population of Tribulus seeds remained after the drought (1979, 4 seeds per square meter) unlike the Portulaca seeds, which none remained. This is important to know as the seeds were the first cause of why many  Finches with thinner/smaller beaks died out first, as the Portulaca seeds are thin and soft and are easier food source for Finches with thinner, smaller beaks.

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♥ʀᴇᴀꜱᴏɴɪɴɢ 2♥

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♥ʀᴇᴀꜱᴏɴɪɴɢ 2♥

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Natural selection allows the Finches to survive, by adapting and changing to fit their environment. As the drought occurred, the beak length has increased within the birds to scout out for food that are in their environment and reach. As the Finches with thinner/smaller beaks die out as they cannot sufficiently eat the plants and seeds on the island, those with average and bigger beaks live on and pass down these traits.

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♥ʀᴇᴀꜱᴏɴɪɴɢ 1♥

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♥ʀᴇᴀꜱᴏɴɪɴɢ 1♥

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In between Nov.1977-Mar.1978, the Finch population has decreased because of their survival chances lowering because they could not survive in of their environment as their food sources, such as the plants on the island becoming scarce and a decrease in rainfall due to the drought.

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♡༺ᴇᴠɪᴅᴇɴᴄᴇ 3༻♡

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♡༺ᴇᴠɪᴅᴇɴᴄᴇ 3༻♡

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The number of Portulaca and Tribulus seeds per square meter has decreased differently during and after the drought. Portulaca seeds have decreased more drastically than the Tribulus by 2-6 seeds less than the Tribulus seeds.
-Lab 18: Finch Data, Seed Type Abundance

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♥༺ᴇᴠɪᴅᴇɴᴄᴇ 2༻♥

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♥༺ᴇᴠɪᴅᴇɴᴄᴇ 2༻♥

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The length and depth of Finches’ beaks after the drought increased. The increase of beak length and depth in 1978, from about 9-10mm in depth and 8-14mm in length.
-Lab 18: Finch Data, Finch Characteristics 1976-1978

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✧༺ᴇᴠɪᴅᴇɴᴄᴇ 1༻✧

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✧༺ᴇᴠɪᴅᴇɴᴄᴇ 1༻✧

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The quantity of Finches with larger beaks increased after the drought. About in 1977-78, during and after the drought, the Finches population has increased by 93-189 Finches in between January and March.
-Lab 18: Finch Data, Population By Month

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ᴛʜᴇ ᴍᴇᴄʜᴀɴɪꜱᴍ ᴏꜰ ᴍɪᴄʀᴏᴇᴠᴏʟᴜᴛɪᴏɴ ᴛʜᴀᴛ ᴄᴀᴜꜱᴇᴅ ᴛʜᴇ ʙᴇᴀᴋ ᴏꜰ ᴛʜᴇ ᴍᴇᴅɪᴜᴍ ꜰɪɴᴄʜ ᴘᴏᴘᴜʟᴀᴛɪᴏɴ ᴛᴏ ɪɴᴄʀᴇᴀꜱᴇ ꜱɪᴢᴇ ᴡᴀꜱ ɴᴀᴛᴜʀᴀʟ ꜱᴇʟᴇᴄᴛɪᴏɴ.

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ᴛʜᴇ ᴍᴇᴄʜᴀɴɪꜱᴍ ᴏꜰ ᴍɪᴄʀᴏᴇᴠᴏʟᴜᴛɪᴏɴ ᴛʜᴀᴛ ᴄᴀᴜꜱᴇᴅ ᴛʜᴇ ʙᴇᴀᴋ ᴏꜰ ᴛʜᴇ ᴍᴇᴅɪᴜᴍ ꜰɪɴᴄʜ ᴘᴏᴘᴜʟᴀᴛɪᴏɴ ᴛᴏ ɪɴᴄʀᴇᴀꜱᴇ ꜱɪᴢᴇ ᴡᴀꜱ ɴᴀᴛᴜʀᴀʟ ꜱᴇʟᴇᴄᴛɪᴏɴ.