Urchin

Sort By:
Decent Essays
Good Essays
Better Essays
Amazing Essays
Best Essays
    Page 1 of 21 - About 201 Essays
  • Better Essays

    Introduction Sea urchin gametes are an excellent model for observing vertebrate development. Sea urchins are a low cost species that can be maintained in a laboratory environment, have external fertilization and have distinct stages for viewing development in offspring. They are external breeders, so when the gametes are mature, they are released into seawater. The seawater carries the gametes where they will fertilize and develop. How does the sperm find the eggs? The jelly coating on the mature eggs produce a chemical signal that attracts sperm (Gilbert, 2000). This method of sperm finding egg must have a protection mechanism for the right sperm to find the right egg. The sea urchins have a particular bindin receptors that look specifically…

    • 1147 Words
    • 5 Pages
    Better Essays
  • Better Essays

    Methoxychlor Pesticide

    • 1494 Words
    • 6 Pages

    on the effects of exposure of environmental toxicants believed to interfere with hormone-sensitive processes related to reproductive development and sexual differentiation, but few studies have examined the effects of early exposure to these environmental toxicants on other aspects of vertebrate development. Because of their rapid development and their aquatic nature, sea urchins may be particularly sensitive and useful for studying the effects of environmental toxicants on early development.…

    • 1494 Words
    • 6 Pages
    Better Essays
  • Amazing Essays

    Sea Otters Pros And Cons

    • 1244 Words
    • 5 Pages

    triggered by the addition, or removal of top predators and involving reciprocal changes in the relative populations of predator and prey through a food chain, which often results in dramatic changes in ecosystem structure and nutrient cycling (huffingtonpost.com).” For that reason, in today’s society we have witnessed numerous trophic cascades that occur all over the world, specifically sea otters, blue crabs, jaguars, and as we discussed in class wolves that illustrate predators that decimate…

    • 1244 Words
    • 5 Pages
    Amazing Essays
  • Good Essays

    creatures is the Sea Urchin. Sea Urchins are classified in the kingdom of animalia and their phylum is Echinodermata. While usually known as the Sea Urchin their scientific name is Echinus esculentus. Echinus esculentus’ meaning is “a Sea Urchin that can be eaten”. Sea Urchins may not seem like an existing animal but they are one of the most unique animals in the sea. The Sea Urchin has very unique and interesting characteristics. Sea Urchins can be black,brown,green, white and many more…

    • 328 Words
    • 2 Pages
    Good Essays
  • Good Essays

    that will affect the predators of those fish and the chain keeps on going also in life if you treat someone well or poorly that might affect how they treat you in the future. Nature was beautiful in BC, it was amazing to see the old growth forest and that that was one of the few ones in the world meaning most forests are man-made. The natives of kyuquot use all things and don’t waste anything like when they make or find food, shelter, and transportation. Everything is connected was mentioned a…

    • 1001 Words
    • 5 Pages
    Good Essays
  • Decent Essays

    This organism can be found along the shores of the Chesapeake Bay and throughout lakes, streams, and almost anywhere. The organism is most commonly known as the common otter, North American river otter or scientifically known as Lontra Canadensis. The Northern river otter has a dark brown fur wither lighter brown along the face and belly. They have thick fur to help them keep warm while swimming in cold waters to catch fish. Their webbed feet allows them to swim faster in the water and they also…

    • 262 Words
    • 2 Pages
    Decent Essays
  • Decent Essays

    The text and the lecture are about reasons that caused sea otters declination. The text provide two reasons ro suppot the pollution theory of otters declining. However, the lecturer refutes this theoty and states that three reason is predator, ocra. First, the text says thata lot of sourses of chemical pollution are allonf the Alaskan coast. Thus the chemical pollution could cause immune system of sea otters and as a result to decline populatiion. However, the lecture says thatit it have not…

    • 271 Words
    • 2 Pages
    Decent Essays
  • Decent Essays

    All of the effects are not known, however a few studies link the relationship between endocrine disrupting compounds and sea urchins as toxic. For example, two scientist Bôttger and McClintock studied the effects of the widely known sea urchin: Lytechinus Variegatus. In their experiment they exposed Lytechinus Variegatus to both inorganic and organic phosphates, which are also accepted endocrine disruptors. These scientists found that the exposure of this sea urchin to these phosphates…

    • 1430 Words
    • 6 Pages
    Decent Essays
  • Amazing Essays

    Sea Otters Lab Report

    • 1347 Words
    • 6 Pages

    Population 1. Introduction: From Mexico, to Alaska, and even within Japan, there’s a high chance of being able to visit areas where sea otters can be sighted. Sea otters, also known scientifically as, Enhydra lutris, inhabit shallow coastal areas and they prefer places with a lot of kelp. They use the kelp surrounding them to wrap themselves in while they’re resting. They are very sociable creatures and eat animals that have shells, like clams and abalone. (www.marinemammalcenter.org/) Another…

    • 1347 Words
    • 6 Pages
    Amazing Essays
  • Good Essays

    Mistmantle Urchin de las Estrellas Fugaces Everything started in a day were all the stars were falling from the sky, a little baby squirrel was born and abandon in a place called Mistmantle, that night Father Fir was making sure that Mistmantle the place where all the animals were was safe , that same night he saw something in the ground , he got scared and surprised at the same time. Father Fir was an old porcupine and very religious animal. When he went to see the mysterious thing in the…

    • 881 Words
    • 4 Pages
    Good Essays
  • Previous
    Page 1 2 3 4 5 6 7 8 9 21