Reading+1

Reading log 1 - Using Mathematical Models to Study the Dispersion of Exotic Marine Species**
 * WOW 7pts [[image:bluejellyfish.jpg]]

Before Reading: - Studies -Marine -Distribution -Ocean -Model -Research -Scientist -Biology -Population -Fish
 * Read the tilte and list 10 words you think you might find in the text.
 * How can you use math applied to biology. Mention one thing you can think of.

I can use the math for quantify the growth of a population of a determinate species in specific place, to know how that species interact with their environment and make that place our home.
 * What do you know about jelly fish? What kind of fish is it? If you don't know, find out, cut and paste an image of this fish. Please acknowledge the source.

//“//**//Jellyfish//** //(also known as **jellies** or **sea jellies**) are free-swimming members of the phylum// // [|Cnidaria] ////. Jellyfish have several different morphologies that represent several different cnidarian classes including the//[|//Scyphozoa//] //(over 200 species),// // [|Staurozoa] // //(about 50 species),// // [|Cubozoa] // //(about 20 species), and// // [|Hydrozoa] // //(about 1000–1500 species that make jellyfish and many more that do not).//[|//[1//]][|//[2//]] //The jellyfish in these groups are also called, respectively,// // [|scyphomedusae] ////,// // [|stauromedusae] ////,// // [|cubomedusae] ////, and// // [|hydromedusae] ////;// [|**//medusa//**] //is another word for jellyfish, and as such is used to refer specifically to the adult stage of the life cycle.// //Jellyfish are found in every ocean, from the surface to the deep sea. Some hydrozoan jellyfish, or hydromedusae, are also found in fresh water; freshwater species are less than an inch (25 mm) in diameter, are colorless and do not sting. Many of the best-known jellyfish, such as// [|//Aurelia//]//, are// // [|scyphomedusae] ////. These are the large, often colorful, jellyfish that are common in coastal zones worldwide.// //In its broadest sense, the term jellyfish also generally refers to members of the phylum// // [|Ctenophora] ////. Although not closely related to cnidarian jellyfish, ctenophores are also free-swimming planktonic carnivores, are generally transparent or translucent, and exist in shallow to deep portions of all the world's oceans.”

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Image Source:


 * What is dispersion? If you don't know, find out, please acknowledge the source.

//“// // The measures of dispersion, also called measures of variability show the variability of a distribution, indicating by a number if different variable scores are far from average. // // The larger this value, the greater the variability, the smaller, more homogeneous will be average. // // So we know if all cases are similar or vary widely between them // // To calculate the distribution variability has on your average, calculated the average deviation of scores on the arithmetic mean. // // But the sum of the deviations is always zero, and adopting two kinds of strategies to overcome this problem. // // One is taking the deviations in absolute value (mean) and the other is taking the squared deviation (variance).” // // Source: // [|http://es.wikipedia.org/wiki/Dispersión_(matemática)]

__While Reading and After Reading__ 1. Click on the following link so that you can read the article. [|http://www.maths.unsw.edu.au/school/articles/jellyfish.html]

2. Try to locate the words you though you were going to find in the text (question 1 before reading) List the words you found Scientist, Biology, Research, Marine, Species.

3. Find what the following referents in bold letters refer to in the text: · The species of Jellyfish studied are known as Aurelia and **these** are found over much of the world’s temperate oceans. Refers to: The species of Jellyfish studied · By simulating the movement of the jellyfish over a 7,000-year period the study provides strong evidence that the world-wide dispersal post-dates European global shipping and trade, **which** began almost 500 years ago.

Refers to: the world-wide dispersal post-dates European global shipping and trade · Ships take in water for stability before a voyage and, despite preventative measures such as mid-ocean exchange/ flushing, **this 'foreign' water** and **its contents** can find its way into bays and harbours at the ships destination.

· The computer model could answer similar questions about the migration and introduction of any suspected non-native marine creatures, according to **its** developers Professor Matthew England and Alex Sen Gupta. Refers to: Professor Matthew England and Alex Sen Gupta. · Now we have a tool that can include data on currents, geography and the biology of an organism to help separate natural dispersal **from that which happens** through shipping and trade 4. What is happening with the fish? Jellyfish are immigrating from their places of origin, to areas completely unrelated to those places, because of some fact that make immigration 5. What explanation scientists had given? Scientists say that this immigration is given by the use of sea trade routes, which pass through the areas of origin of the jellyfish, making it shifts along with the direction that brings the "boat" to reach its destination.

6. What did mathematicians find out? What does the formula explain?

Mathematicians found and established a mathematical relationship between the maritime routes and the growth of jellyfish population between those routes, taking into account factors such as water temperature, mortality, birth, growth, time, etc.. Establishing a mathematical equation that can take these factors into account when making the calculations required to study a population of jellyfish "foreign" in this areas.