9. The bristles are used to gather food. They can also be used to detect movement around them.…
Conservation Status: Crabeater seals are under the 'Least Concern' category of extinction. This means that there population is large enough to survive. They are known as one of the fastest breed of seal and it is because of this they are able to get away from threats.…
Soldier crabs alongside other species fight for resources, and this can have drastic short and long term consequences. Even small…
Monterey Bay is one of the most well known ecosystems in the United States here's a little about it. Monterey bay is home to 525 species of fish, 180 types of seabirds and shorebirds, and Monterey bay has a abundant amount of invertebrates and algae. Monterey bay also has a beautiful environment. Including the sandy dunes, rocky cliffs, rolling hills, steep mountains, and kelp forests. The total length of Monterey bay is over 5360 miles across. In that 5360 miles is the nation's largest kelp forest and canyons. One of the many organisms that live in the kelp forest is the Foliate Kelp Crab.…
The Red Cedar River is home to many interesting and unique species of organisms, including crayfish. Crayfish play a significant role in the ecosystem by serving as a food source to different organisms. By studying the factors that influence the amount of crayfish in a freshwater environment, researchers can discover more about how ecosystems persist. The overpopulation of crayfish in freshwater systems can lead to various negative impacts, such as the feeding on plants that are major food sources for different aquatic organisms and the eating of fish eggs leading to the decrease in population sizes. If there is evidence proving a positive correlation between phosphorus concentration, a chemical element that can enter water through waste or…
The vampire fish. That is what the Sea lamprey was nicknamed when discovered in 1835. First spotted in Lake Ontario, researchers were horrified to learn that the Sea lamprey feeds on blood. These parasitic fish latch on to their victims and siphon their blood and other body fluids, sucking them completely dry. What separates the Sea lamprey from other fish, other than their horrifying blood fetish, is their unique body structure. These fish do not have jaws or any other bone structure in their anatomy. Instead of the norm they possess a skeleton that is made out of cartilage. With a unique body set up, comes a unique mouth. It is described to be a large hole filled with sharp, pointy teeth. And this teeth frame a just as deadly tongue.…
When a second invasive species is introduced in the same environment the effects can become magnified tremendously, creating a serious cause for concern. 1 The European green crab (Carcinus maenas) invaded the Atlantic waters of North America in the early 1800s. The green crab is an omnivorous predator and has shown consumptive and noncomsumptive impacts throughout local ecosystems. 1 These same ecosystems were invaded two decades ago by a second omnivorous predatory crab, the Asian shore crab (H. sanguineus). Today, the Asian shore crab is well established and is becoming a dominant crab species in Massachusetts, as well as much of New England. The species has become such a threat because it can tolerate vast ranges of salinity and temperature, is an opportunistic omnivore with a broad diet, females have a high fecundity with a breeding season twice as long as native crab species, and there are no natural predators in the non-native range. A broad diet creates the potential to significantly disrupt the food web, ultimately affecting indigenous crab, fish and shellfish species. A steady increase in population since being introduced raises concerns of how this species is affecting the ecosystem and native…
Purple Shore Crabs, Hemigrapsus nudus, are small crabs that are similar in structure to true crabs. They have carapaces that are commonly found to be 4-5.6 cm. A distinguishing characteristic of the Purple Shore Crabs is their lack of setae. They are usually found to be dark purple, olive green or red with white or cream marks, on their carapace. Their legs match the color of their carapace but have white tipped claws.…
The Carcinus Maenas, also known as the European Green Crab, is currently one of the most invasive species in the United States. The crab was originated in Europe, and nevertheless made its way to the United States in the 1800’s, by riding across the Atlantic ocean on a ship. After reaching the U.S, they traveled to Maine, where they currently are and have been for over a century. They were first spotted at Casco Bay in Portland, Maine in 1900, and made its way to Jonesport, Maine in 1951.…
Native to the Western Pacific Ocean, lionfish have spread along the southeast coast of the US, the Caribbean, and in parts of the Gulf of Mexico.…
Regeneration is the biological mechanism whereby organisms restore lost or damaged cells. This process can be used to replace organs, tissues and limbs on a small to large scale. Each type of regeneration requires different amounts of energy, resources and time. Orconectus rusticus (crayfish), compete for food, survival and mating. They have large claws that are vitally important in competition and survival. This species has developed the ability to regenerate these claws over time if they are lost or damaged. The motives and forms of regeneration in crayfish have evolved due to many factors. The effects that regeneration has are linked to the various needs that have evolved in the…
The Chesapeake Bay produces the largest amount of crabs in the United States. The Blue Crab or Callinectes sapidus, are mainly found in the deep waters of the open Bay among the waving strands of the bay grasses. The Blue Crab takes advantage of its' opportunities when it comes to food and feeds on live and dead fish, crabs, clams, snails, eelgrass, sea lettuce, and decayed vegetation and other foods which it is able to consume. Blue Crabs grow by the process of molting in which they shed or take off their outer hard shell and the soft shell under it eventually becomes another hard shell to help protect it from dangers which lurk and try to feed off the crabs. The difference between the male and female blue crabs can be told by the abdominals…
Protecting each of these species from human-caused disturbances and habitat degradation is critical. The recovery of the red knot population depends on the recovery of the horseshoe crab population (Niles, et. al., 2009). Extensive efforts have been made to restore horseshoe crab populations and increase availability of crab eggs to foraging red knot populations (Karpanty, et al. 2011). According to United States Fish & Wildlife Services (n.d.), the red knot numbers have stabilized in the past few years, but remain low compared to earlier decades. The best chance for halting and reversing the decline of the red knot is through restoration of the horseshoe crab and their eggs (Niles, et. al., 2009). By restoring the crab populations, Delaware Bay could once again provide the critical food resources to the red knot and other migrating birds. Furthermore, researches need to be mindful of the additional threats that face red knot populations. Rising temperatures caused by global climate change are altering the conditions of the bird’s breeding grounds and their habitats are being threaten by rising sea levels (Defenders,…
If you imagine Georgia as a place where small towns have community events like jubilees and jamborees, you're correct when it comes to Crabapple. The community is a larger part of Milton, Georgia, which sees its share of community events for the entire family. It brings about a friendly sense of shared community. The Crabapple Community Association sponsors plenty of family activities.…
This is a story about crabs, with a very simple lesson for you and me. It is said that many many years ago, the animals that lived near the water noticed something strange about the crabs, “the crabs walk sideways,” Said the frogs.”Poor crabs!” they cried out. “They don’t know how to walk straight.” “It’s not good when you can’t walk straight,” the turtles added. “That’s why these crabs keep bumping into things.” The animals had a long discussion. Finally, they decided to hold a class every Sunday to teach crabs to walk straight. Sunday came, and the crabs came to class eager to learn. The crabs listened well to their teachers. Before the class ended, the crabs could walk as straight as all the other animals. Not only that, the crabs together learned how to march in line following the commands of the teacher. The crabs promised to return to class next Sunday. And each crab went back home---walking straight. When the next Sunday came, the crabs returned. But … they came to class walking sideways!…