The stickleback fish have gained much attention from evolutionary biologists because of their historic ability to adapt to conditions that were not favorable and to survive successfully in them. They are also able to give researchers insight into how evolution occurs in other organisms. The stickleback normally spawns in freshwater but lives in the salt-water ocean. Long ago when ice melted and receded, the fish were given new possible places to inhabit and they did, expanding their spawning locations to newly formed streams. Eventually, though, the streams were cut off from the sea and the once salt-water sticklebacks were faced with the problem of being stuck in freshwater with no way to get out.1 The presence of sticklebacks in freshwater lakes today shows that somehow the fish were able to still survive even though they were in unfavorable conditions. The question is: how did they do it?
The three spined stickleback fish has many unique traits. some of the most notable structural adaptive traits of this specie are the three spines and body armor. The three spines are sharp and located on the back forward of the dorsal fin. The lateral bony plates are located on each side of the body. These structural armors projecting from the back and pelvis can simultaneously flare out when the fish feels threatened as a defense against predatory vertebrates making it difficult for predators to swallow them. With the back spines pointing directly upward and the pelvic spine pointing out at a perpendicular angle make it difficult for a predatory fish that catches a stickleback to swallow the stickleback. This added benefit allows the fish
In the stickleback fish found in Big Lake (seen in slot #4 and #5) are about 1400 base pairs long. By using PCR, we were successfully able to isolate the Pitx1 enhancer region in the marine control, and both stickleback fish in Big Lake. The sterile water used in the experiment was not contaminated, as seen in slot #6 of the gel electrophoresis, which means the results of the experiment should be accurate and without any contamination. There is a deletion in the Pitx1 enhancer region of the stickleback fish found in Big Lake, since the Pitx1 enhancer region is approximately 117 base pairs shorter than the marine
Fish Animations Science: Biodiversity, Adaptation & The Role of Water Technology: Creative Communication Math: Geometry 60 Minute Lesson White paper (1 piece per student) Pencil (1 per student) Crayons and markers Introduction (5 min) Fishnet (10 min) Food Chain Discussion (5 minutes) Big Fish (30 minutes) Clean Up & Wrap Up: (10 minutes) Swim in the rivers, lakes, streams and every other freshwater habitat of the world to discover nature’s buffet: food chains!
Salmon play a vital role in the economy, culture, and environment of the Pacific Northwest. They form an important part of Native Alaskan tradition and are a traditional food staple in many communities. Salmon are also the base of one of Alaska’s three primary industries, commercial fishing. Commercial fishing is one of Alaska’s largest industries, the others being the tourism and oil and gas industries. Salmon also have a big impact on the environment, supporting many different types of wildlife. Unfortunately though, the salmon population has fallen drastically and since 2007 salmon runs have been decidedly below average.
Gila trout are endangered in some stretches of water that are managed as designated wilderness. A hands-off policy would be their doom. Because exotic trout species now swim in the same streams, Gila trout can survive the competition and the temptation to interbreed only if they swim in isolated tributaries. In which a water-fall blocks the upstream movement of other fish. Two decades ago, one such tributary was fortified. With a small concrete dam. In other words, a dam deliberately built in the wilderness. It is often difficult to choose the right way. To manage a wilderness area. A scientific grasp of the way the ecosystem works is essential. Yet not always
The number of sea otters a long time ago was 150,000–300 000, but unfortunately because of the fur trade, they were hunted a lot for their expensive fur between 1741 and 1911. The world population of sea otters fell to only to about 1 000–2 000. But later after all that, there was an international ban on sea otter hunting, and reintroducing sea otters into previously populated areas has helped to repopulate the species. Because of all the human help the species now occupies has about two-thirds from the population number they had before. The recovery of the sea otter is considered an important success in marine conservation.
Vertebrates are known to be animals with backbones. Tooth reduction is one of the major evolutionary trends that developed among major vertebrate groups that allowed for the transition from aquatic to terrestrial life. Evolution of limbs and being able to breath air are other evolutionary trends that took placeThese trends include improved respiration and protective and insulating body coverings. More over the transition from water to land also included changing to more efficient reproductive methods like having a placenta for some animals or egg layers for other animals. Lastly, the morphology of organisms evolved such that for land they would have paired, muscular appendages used for crawling and
In this experiment we tested to see if the catfish contained lead by using a lead testing kit. We used the data collected by ORNL in 2011 that is now accessible to the public. We pose that, if the age of the lake is older than the amount of lead will increase in the catfish when the amount of lead in the fish is a function of how old the lake is. Assuming the age of the lake would affect the amount of lead in the fish. The lakes that we picked were Tellico Lake, Melton Hill Lake, Watts Bar Lake, and Fort Loudon Lake. We chose these lakes because they are close to where we live, and we thought they would provide enough diversity to compare. We wanted to do the project in our area so we could relate our results to ourselves and the people around
The ocean is a giant body of water that is home to all types of fish. The ocean provides a rich environment for a plethora of animals from the tiniest of fish to the enormous whale. In the ocean, these creatures live and explore. Some of them must hunt other fish in order to survive, which means that others must try to avoid predators. Nature has provided all of these animals with a unique capability to survive. The ocean abounds with interesting animals of all shapes and sizes that have their unique appearances and habitats at different depths of the sea.
VARIABLES: There are independent variables, dependent variables, and controls. the one that is being tested and the one that is the inconsistent variable in the Independent variable like the volume and surface area of the agar cubes. The variable that is kept consistent is the dependent variable such as the percentage of diffusion of pigment in the agar cubes. The constant variable is the features of the experiment that is kept the same throughout the entire experiment such as, the amount of time the agar cubes are left in the beaker and the amount of acid in the beaker.
For many it’s a first pet, a gift from family, something you won as a prize at a carnival, but for Canadian residents the familiar orange goldfish everyone knows and loves is becoming a serious problem. Some flush them in a hurry because they no longer want to take care of them, others commit them to a porcelain vortex because they believe their beloved fish has passed, and the Canadian Government is issuing a warning now to citizens of Canada to stop flushing their fish.