Hemigrapsus Oregon Bags Essay

The purpose of this investigation was to test sowbugs preference between grass and sand. The results of this experiment show that sowbugs prefer sand to grass. Of the 20 sowbugs, they preferred sand 11 times, and grass 9 times (Table 1). A possible explanation for this is because of other contributing factors, such as endogenous rhythms (Cloudsley- Thompson, 1951). Our null hypothesis was accepted

The species randomly settle throughout the rock. Both species are settled at the bottom and top. They settle on same parts of the rocks as the other species did. There is more of an abundance of the Chthamalus than the Semibalanus.

Referring to the experiment`s hypotheses that the A. franciscana prefers light, temperatures between 20-24 ̊ C, and a basic (pH 8) environment; the results regarding the first treatment, light, were initially vague. According to the experiment results, the A. franciscana did not show a clear preference towards light or dark because both sections contained high concentrations of them; the A. franciscana also strayed from the uncovered section. Several factors may shed light on the results such as the A. franciscanas physical appearance; they possess three light-sensitive eyes that can adjust to both low and high light intensities (Fox, 2001). This means that although they may prefer light they can survive in darker habitats as well; relating back to the experiment the A. franciscana may have been content with wherever they were, resulting in limited movement.

levels were high, in order to avoid predation by invertebrate predators such as Chaoborus. PAR

Crabs spawn near the mouth of the Bay in Virginia water, therefore few sponge crabs (female crabs carrying eggs) are seen in Maryland (“Chesapeake Wildlife”). Juvenile crabs migrate northward to feed and grow in the brackish creeks of the Tidewater.

What I plan to do in activity 3 is put a superman plush toy inside the brown bag and let Abigail feel it. Once Abigail felt the brown bag I gave her a piece of paper and told her to draw whatever she wants. Also when she touches the brown bag she says she felt something soft like a plush toy. I provided Abigail with scissors, glue, paper and crayons and she actually used all the materials. While she drew I put some music because in all the activities that I have done with her she always enjoys the music. I notice that in her drawing she didn’t drew the brown bag, she actually drew whatever she wants. I notice that she drew a house, flower and triangle. When Abigail finish her drawing I told her to open the brow bag and her respond

This species of communal crab only grows to a width of 1 inch, and has a square purplish body. The main source of food for these creatures are the leaves of marsh cordgrass, and the occasional smaller species of crabs like fiddler crabs. They are also nocturnal creatures, which makes them hard to study. Predators of this species include the Blue Crab, Striped Bass, and certain species of marsh birds.

This lab is based off of European Green Crabs preying on Periwinkle Snails. From the name, one can tell the European Crab originated in Europe and is not native to North America. The crab ranged its expansion north of Cape Cod, where Periwinkle snails were introduced to a new predator. (McRae, 2015-pg. 1)

On August 28, 2014, my family and I went to Washington Crossing State Park. The park section where we stayed was 74.862940 degrees south (Longitude) and 40.313780 degrees east (Latitude). We went there at 2:20 PM and returned at 3:51 PM. The objectives of my observation was to clearly identify the energy flow in the environment while observing the flora and fauna of the area. The temperature for the past few days was around 85 to 90 degrees Fahrenheit and it was mostly sunny. The temperature when I went to the park was 78 degrees Fahrenheit which was slightly cooler than usual. The heat might have caused some animals to stay in their

Studies have found information on ancestral species of current horseshoe crabs. Xiphosurids, which are very old fossils that were not easily found; however, they were compared in body structure of current time horseshoe crabs and showed that there was hardly any change in the body structure. The body plan of a xiphosurid is described as having large crescent like shield in the anterior portion of its body resembling an invertibrate with lateral compound eyes. Xiphosurids are also classified as having opisthosomal tergites built into a thoracetron and having a long styliform telson (Rudkin et al. 2008).

Warty Jumping-Slugs are around 20 mm when fully grown. They have a noticeable hump on their back (mantle); it is a flat shell that is almost covered by their skin. The slugs have a greyish, brownish body with dark patches, and dark blue eye stocks (tentacles). The name “Jumping-Slug” comes from the way they “jump” or “flop around” when irritated.

The early stages of their lives are spent on the intertidal flats and shallow water areas near their natal beaches. However, as they grow, they wander even farther from the shallow waters into deeper estuarine waters (Shuster, 1979) and are fully capable of excursions onto the continental shelf in search of prey when their habitat is threatened, or when the population becomes too dense (Sekiguchi & Shuster, 2011). Because they can tolerate and cope with wide ranging environmental conditions, especially temperature and salinity, they are classified as environmental generalists (Sekiguchi & Shuster, 2011). Limulus polyphemus are also regarded as dietary generalists; adult horseshoe crabs are omnivorous and feed on a wide variety of seabed invertebrates, including crustaceans, gastropods, polychaetes, bivalves (Botton et al. 2003; Botton, 2009), and even algae (Cartwright-Taylor, 2015). When the crabs encounter patches of their preferred prey, such as bivalves, they have been known to feed extensively, packing their guts with the shells (Botton,

Approximately, two or more weeks after the eggs have been laid, larval horseshoe crabs will emerge from the eggs. These larva then migrate to near shore waters and settle on the sandy bottom of tidal flats where they will further develop for another year or so (National Wildlife Federation 2015). As the horseshoe crab larva develops over these next few years, it will gradually move to deeper water and begin eating food more typical of an adult. Limulus polyphemus will reach reproductive age after about ten years. During these years and those after, horseshoe crabs will molt shedding their exoskeleton allowing them to grow a larger shell for their growing size (National Wildlife Federation 2015). Horseshoe crabs will typically molt 16 or 17 times during their

Shells before 1884, were high-spiraled with thin walls. Compared to the shells found after 1884 were low-spiraled with thick walls. After doing some research, Seeley found that an intertidal crab, Carcinus maenas, had sought after the snails for food.(Seeley) It was found that the shell size had changed due to the harmful

The chapter starts off with Aunt Alexandra having tea with her missionary circle. This time, Aunt Alexandra invites Scout to participate in her circle as well. Suddenly, Atticus interrupts the missionary circles discussion and talks to Aunt Alexandra, Calpurnia, Miss Maudie, and Scout privately in the kitchen. He informs them that he has received news that Tom Robinson attempted to escape prison and was shot seventeen times in the process. Atticus alongside Calpurnia go notify the Robinson family about Tom’s death. This news in shocking and has Aunt Alexandra and Scout flustered. Aunt Alexandra then goes on to ramble about how Atticus is just deteriorating his health and time all for people that do not appreciate the work he puts himself through.