Genetic Diversity In Tiger Sharks

The koala has low genetic diversity. Koalas are mammals and they can live up to 20 years. Their diet is herbivor. Koalas size is 60 to 85 cm plus their weight is around 9kg. Their habitat is the highest branches of eucalyptus trees, known as the gum tree.

Sharks grow slowly and reproduce at a low rate. Their natural rate of replenishment is low, because they reproduce late in life and produce few offspring (Sims and Reid, 2002). If too many of a certain shark species is killed in a certain area, it is possible that that species may never recover. For example, the number of dusky sharks and sandbar sharks off the eastern United States decreased by more than 80% between 1985 and 1995. The sand tiger shark and the great white shark are threatened world-wide. Despite reproduction, little is known about the status, behavior patterns, and their migration patterns of most

Tigers are amazing creatures that have gone through several evolutionary changes from the beginning of their species. A modern day tiger is most recognizable for their pattern of dark vertical stripes on orange fur with a white underside. The largest modern day tiger in record was eleven feet tall and weighed 387 pounds. In the terms of science tigers are under the classification of roaring tigers and the scientific name of a tiger is Panthera tigris. But in order to learn about about the evolutionary changes of the tigers of today; it is important to look at the the core definition of evolution itself and the history of the adaptations that lead to the modern tiger. The adaptation of various ancestors shaped the outcome

Shark mating rituals vary from the size of the shark and its specie. In smaller, more flexible species, the male coils around the female, while the male of the larger specie orients himself parallel and head-to-head with the female (Woums & Demski 1993). Some species mating rituals also consists of males biting females on the pectoral fins or the middle of the back to hold on to them (Woums & Demski 1993). The female will often bear scars or marks, after the ordeal. Due to the fact that sharks are cold blooded animals, there is no precise gestation time. The development of the embryo will depend solely on the temperature of the water, however, the gestation period can last anywhere from 2 months to 2 years (Woums & Demski 1993). Within shark species there are two methods of reproduction. In some cases a female shark will lay eggs in a coastal nursery where the presence of other sharks are absent. And in other cases, usually in the larger sharks, females give birth to live offspring (Wourms & Demski 1993). In which case the young are born fully developed, and once they are born they shoot away fast or they risk being eaten.

The Australian Grey Nurse Shark is also known as the Spotted Ragged-Tooth Shark and as the Sand Tiger Shark ("Australian Threatened Species”). The species is identified by its gray to gray-brown coloration, the possible presence of reddish/brownish spots on the caudal fin and posterior half, their countershading, and by its two almost equally sized dorsal fins. They are known to grow over 3.6 meters in length with the males and females maturing at different lengths, 2.21 meters and 2.2 meters, respectively (McGrouther, 2015). Females also mature significantly later at 9-10 years than their male counterparts, who mature at 6-7 years. Their diet consists of fish,

For this discussion, I chose to examine the reproductive nature of mountain lions and hammer head sharks. Mountain lions are solitary cats that live in various mountainous regions of north and south America, but a male and female come together socially in order to mate during the 3-10 day estrus period. Due to their solitary nature, mountain lions rely on scent marking in different territory as well as a mating call of the female in order to initiate the potential for sex. Typically, when a male and female find each other; they spend several days together during the mating period and he may hunt for her and run mating circles around her. Mountain lions are polygynous and both the males and females will mate with multiple individuals throughout

The sharks are protected by the protection act since 1999, but Orgias (2012) reported the shark amounts will drop 60% to 95% in 50 years. Although, the decline will be slowed down by the protection act, but the increment still far less than the reduction. One of the reason is the sharks not really been protected, there are no evidence to show the sharks numbers have recovered since they have protection claimed by Wellbelove (2012). Another reason is the Sharks need a long time for pregnancy and reach to maturity period, so it is difficult to show the amounts of the shark have an apparent

The International Shark Attack File lists bull sharks as the species with the third-highest number of unprovoked shark attacks, with 100 unprovoked attacks (27 fatal) from 1580-2010.

Every animal is important, but sharks are very high up on the list of animals that humans need to protect and save. Without them, our ocean’s ecosystem and coral reefs would be decimated and humans would take a dramatic hit in terms of what we ate and fished. Sharks keep the ocean’s population in check and make sure that there are enough of their prey to sustainably eat while giving us seafood such as scallops and clams. Just because an animal looks scary does not mean that we should be uncaring about its wellbeing and

The evolution of monogamy in mammals has been challenging to understand for ecologists for many years, because in most cases male mammals are thought to have higher fitness through polygamous mating. One of the principles of evolution is that animals want to maximize their reproductive success, so two animals committing to one another kind of seems counter-intuitive. Animals want to pass on their genes to the next generation, and having more offspring means there 's a higher chance of survival. When females have long lactation periods or gestation, they are unable to mate during this time, so it would seem to be advantageous for the male to move on to their next mate.

You may find yourself asking why are Sharks even important? Sharks are extremely important because they bring balance to their ecosystem. Sharks are apex predators, meaning they are the predator at the head of the food chain where there is no other competition against them. Being an apex predator, meaning, they are actually in charge of their food chain. When Shark populations fall it causes problems in their ecosystem. They maintain the order of their ecosystem by removing the sick and the weak, only the healthy are able to escape, this

A transcriptome is the total of all mRNA molecules found in a sample taken from an organism. Three transcriptomes were taken from bowhead whales and other similar organisms. Each sample of genes provides information about the whales that prove the depth of how well they are protected against mutations. The first sample of genes was taken from the liver. It was revealed that bowhead whales have a lower amount of a growth factor called the Grb14 protein (Seim et al., 2014, p. 881). The reduction of this protein lowers the amount of insulin made, but amplifies the liver’s response to it (Seim et al., 2014, p. 881). The transcriptome that was taken from the heart revealed a few reasons why bowhead whales usually do not develop cardiovascular diseases.

There are 465 known species. The Bull Shark is the first most dangerous Sharks. They hunt during the day and night. The eat almost anything. There are a few sharks that can live and hunt in salt water and fresh water and bull sharks is one of them. They can be anywhere between 7 feet to 11 ½ feet long and weight up to 500 pounds. They are found all over the world and swim up to 25 mph. The second most dangerous shark is the Great White Shark. It can be anywhere from 15 feet to 20 feet long and weight 5000 pounds or more. They are found in cool, coastal waters.The 3rd most dangerous shark is the Tiger Shark. They are also known as the garbage can of the sea cause they will eat anything. Females are bigger than males. They

In the words of Julia “overexploitation threatens the future of many large vertebrates” (Buam et al.). For many years sharks have fallen victim to over fishing, pollution related death, and wasteful culling. According to Sullivan, Twenty percent of the world’s shark population is currently threatened with extinction. According

What is genetic variation? Genetic variation refers to diversity in gene frequencies. Genetic variation can refer to differences between individuals or to differences between different populations. Mutation is the best source of genetic variation.Mutation is the changing of the structure of a gene, and when resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes. but mechanisms such as sexual reproduction and genetic drift contribute to it alot.As with other species, Great Whites are somewhat differ among individuals from place to place. Great Whites from southern