Scientists were studying this correlation and discovered some of the reasons for this higher mortality rate. Some otters are caught and killed in fishermen’s nets, some drown in lobster pots, and predators such as sharks kill some. A final explanation for their low population in California is infectious diseases, which mostly kills
At dusk males will come out to begin a high shrieking call of “ko-kee” to attract females. They choose to lay its eggs in the folds of leaves and remain hidden during the day; therefore the movement and sale of potted plants have been linked to their spread (Coqui Frog Information, 2009) the spread of invasive species must be taken seriously because of the destructive impact they have on the environment. Environmental Impact There are many environmental impacts of the Coqui frog in Hawaii however the most prominent impact is its appetite and the explosion of its population. According to Coqui frog information (2009), “Coqui frogs consume more than 50,000 insect’s per-night.” These insects that it consumes consist of native snails and spiders. By consuming such high numbers of insects, the Coqui is jeopardizing native birds and bats that also consume the same insects that the Coqui frog vastly
In return, the Europeans fell to the New World disease of syphilis. The repercussions of the Columbian Exchange were somewhat mixed. It created increases in food production which resulted in a major increase of human populations. The diseases Columbus left behind caused the population in America to fall, while the
Yorktown Technologies’ GloFish venture was no different. Although, Yorktown Technologies’ business plan centered on the marketing of a biotech technology involving fish, it nonetheless provoked censure from some scientific and animal rights communities. The company also encountered difficulties from several regulating factions of a number of Fish and Game Commissions. With disappointing revenues in 2004, Yorktown Technologies’ marketing position was tenuous and in need of revamping. Case Analysis In the United States, the sale of freshwater ornamental fish and related products is an industry worth over 700 million dollars annually (Kerin
The droughts and increased heat has had negative impacts on local aquatic invertebrates. Aquatic invertebrates are adapted to survive in a particular range of temperature and habitat. But global warming makes it harder to survive. This could lead to the extinction of several species of aquatic invertebrates which in turn would lead to serious consequences of the ecosystem. Many of the aquatic invertebrates are responsible for keeping the ecosystem clean by feeding on litters.
It is thought that the obstruction is due to fecal material impacted into the relatively narrow appendix, though other causes such as ingested foreign bodies may exist. This causes a subsequent increase in the intraluminal pressure of the appendix, resulting in mucosal edema, bacterial overgrowth, and eventual perforation. Due to the fecal material in the appendix, perforation causes inflammatory fluid and bacterial contents to leak into the abdominal cavity, resulting in peritonitis. Diffuse peritonitis is more likely in young children. Older children and adolescent have a more developed omentum, which walls off the inflamed or perforated appendix, often causing a focal abscess.
(Walker, 1996) These mechanisms play a more important role than antibodies which explains why vaccines are not effective for RSMF. (Walker, 1996) Pathophysiology of Rocky Mountain spotted fever (Rickettsia rickettsii) The primary vector for Rickettsia rickettsii, ticks, become infected through feeding on the blood of infected animals either by transovarial passage or fertilization. (Cunha, MD, 2014) The bacterium is transferred to humans during feeding. (Cunha, MD, 2014) The tick need to be attached to the host for 6-10 hours in order for the bacterium to be transmitted through saliva. (Cunha, MD, 2014) Rickettsia rickettsii has an incubation period of 2-14 days after the bite of an infected tick.
2. Do background research – Utilizing at least one scholarly source, describe how variations in dissolved oxygen content in a body of water can affect fish populations. Answer = “Oxygen depletions are the most common cause of fish kills in ponds. (Aquaplant, 2014).” Based on my observation of the chart and what I read, the higher the dissolved oxygen levels the number of fish drops. Dissolved oxygen levels can also cause fish to suffocate and be more susceptible to diseases.
As the reliable water sources shrank and they were forced to drink the contaminated water. This may have also spread diseases throughout the Colony. The results being more deaths, because of the water sources being contaminated by filth from the colonists. [Doc.B] Shows that there was a large time of drought from 1606-1612.This likely affected the growth of crops. The result was deaths most likely caused by lack of food.
Eugenics is the manipulation of genetics to improve the genetic composition of a population, usually referring to a human population. Eugenics has been around for a long time. When white settlers came to Australia the policy of removing mixed race aborigines came from a eugenics theory that full blooded aborigines were already dying out anyway because of diseases they caught from European settlers and that their population wouldn’t be able to sustain itself. However, in the last 50 years, there have been many new breakthroughs in biological eugenics. From the sequencing of the human genome, published in 2003 to the use of IVF for impregnation, we are only beginning to understand the lengths to which we can take this technology.