Lemurs Of Madagascar: Genetic Analysis

The white phased black bear was said to have traversed barriers of the sea during the last ice age when glaciers covered most of northwest British Columbia. When temperatures started to rise, and glaciers started to retreat it is believed that the white bear was then isolated on the islands off the coast of BC. The white coats would suggest an adaptation to the white snow for hunting, however if that was the case, the evolutionary trail should have left the recessive gene behind when it was no longer useful to them in the temperate forests. Most research that is done on the Spirit bear is to try and understand the polymorphism of this species and how it has come to last among a low frequency in a minute area. Evidence now suggest that the reason for the white fur is actually a very important adaptation for the bear and is still very useful even in the array of

Polar Bears rely upon sea ice for survival. They hunt on seals that are found on sea ice. Climate change and the atmospheric warming have caused the Arctic ice to melt, resulting in loss of habitats for polar bears. This essay will focus on how has climate change and increase in temperature affected the polar bears and what can we do about it.

The Polar Bear (Ursus maritimus) is a bear native largely within the Arctic Circle encircling the Arctic Ocean, its surrounding seas and land masses. Although it is closely related to the Brown Bear, it has evolved to occupy a narrower ecological forte, with many body characteristics adapted for cold temperatures, for moving across snow, ice, and open water, and for hunting the seals which make up most of its diet. Though there are many theories surrounding evolution, the two stand outstanding hypotheses applying to the modification from Brown Bear to Polar Bear are Lamarck’s theory of Use and Disuse, and Darwin’s theory of Natural Selection. The intention of this paper is to compare these thesis and determine the most appropriate in

Black bears in BC have a population that is 9 times that of the grizzlies, however, the results show that the grizzlies have inflicted 9.7 times more attacks on humans in the past 16 years. This goes to show that grizzly bears have a higher tendency to attack due to the natural factors and stresses that act on them cause them to be much more aggressive with less tolerance to threats (Herrero, Aspects of Evolution and Adaptation in American Black Bears (Ursus americanus Pallas) and Brown and Grizzly Bears (U. arctos Linne.) of North America n.d.). Many other papers such as Herrero’s study in both 1972 and 1985 showed the same results where grizzlies had higher rates of attacks compared to black bears in BC and so it clearly shows that there

The anglerfish and polar bear adapt to very extreme enviorments. The polar bears have to adapt to very  cold weather. The anglerfish have to adapt to the very  little food source they have in the deep sea. They both have devoloped many features that can help them while they live in these extreme enviroments.

In the scientific article, “Love in the Time of Climate Change: Grizzlies and Polar Bears Now Mating,” by Adam Popescu, believes that climate change is helping to cause grizzlies and polar bears to mate. He points out that glacier sheets are retreating, this forces the polar bears to move into grizzly’s territory. Moreover, that the permafrost is also starting to melt, which is causing grizzlies to wander into the polar bears territory. Consequently, he goes on to put that because of this mating, the grizzlies are eating up the polar bears genetically. He concludes that if this trend keeps up, in a few decades any kind of the bear population in this area will be no more. Lastly, the author’s purpose is to make readers aware of the hidden effects

There are not many creatures in the world that have the ability to not only survive thirty-two degrees below zero temperatures, but live in this climate as well. Among penguins and seals, polar bears are apart of the group of creatures that live everyday life in these freezing conditions. However, polar bears were not always able to do this. According to the Public Broadcast Service (PBS) website, polar bears evolved from brown bears through microevolution. Microevolution, by definition, is “small-scale evolution that occurs from one generation to the next” (Larsen p. A15). Due to the discovery of fossils, it is believed that brown bears evolved into polar bears between 70,000 to 100,000 years ago. This evolution can be seen by the change of fur color from brown to white to blend in while hunting for food and by the growth of a thicker, warmer coat to protect against the cold temperatures (PBS). This all occurred because of an event called the “ice age”. However, in the year 2316, an event called “global warming” will cause a much different evolution. Global warming is a phrase used to describe the ongoing, subtle rise in temperature of the earth and it’s oceans. Because of the small efforts being made to slow down global warming, nearly all of the ice caps in the ocean will most likely be melted by the year 2316. With polar bears only being able to survive by living on polar

In conclusion, it took many years for polar bears to adapt perfectly to their new arctic environment. However, they’re facing a new challenge and threat due to the melting of the arctic ice because of global warming. In response, the polar bears will eventually evolved to have thinner fur or the polar bears will be forced to adapt to the increasing temperatures of their habitat and may severely decrease the population. In the future, the cross breeding of polar bear and grizzle bears will help these species survive their changing environment.

Depending on the fossil record and DNA examination, researchers have possessed the capacity to land at a clearer photo of the polar bear's transformative way throughout the centuries. Somewhere in the range of 200,000 years back, when ice sheets secured quite a bit of Eurasia, the Arctic Ocean was totally solidified. It was amid this testing period that cocoa bears started to meander looking for sustenance. Roughly 125,000 years prior a populace of chestnut bears in the most distant north of their range was likely separated from their cocoa bear progenitors, maybe in view of rivalry for nourishment. The populace likely got to be confined by enormous icy masses and, while most passed on in the unforgiving environment, those holds on for a developmental

Evolution is a change in genes of a population over time. Speciation is a process of gene changes which cause one population to become 2 unique populations. Speciation can be illustrated using the lemurs of Madagascar as an example. The evolutionary and biogeographic processes experienced by the lemurs are not unusual.

Polar bears are a unique animal all their own. Male polar bears have a versatile diet and foraging strategy compared to female polar bears, which is proving helpful with recent climate changes. Throughout this paper, the foraging techniques of male and female polar bears will be discussed along with increasing climate temperatures and how it is affecting polar bears.

One way that also helps polar bears hunt is their appearance. When hunting for anything other than a seal, the bear will use its white coat to get closer to the prey. Polar bears have huge claws and strong jaws with one pointed row of teeth. Polar bears also have small hairs on the bottom of their feet so they can have more friction on ice. The few things we can see on a polar bear that is not white are their eyes, nose, claws, and, paws. As you can see, the appearance of a polar bear helps them survive.

The body of a bear is made up of their large head, long nose, and thick fur. Bears can’t see as good as other mammals their size, because there eyes are rather small. Their ears are sticking up out of their head which helps them hear well. Their sense of smell is better than their hearing. They use their sense of smell to catch food. Bears climb and swim to get their food. They are good at swimming and climbing, because of their tough shoulders. They have four feet and five toes. At the end of those toes are long sharp claws. They use their claws to dig for food or to attack prey.

To begin, the physical description of polar bear is quite interesting. The normal size of the bear is 7.25 to 8 feet for the head and body and 3 to 5 inches for the tail. Also, their weight is typically 900 to 1,600 pounds (“Polar Bears”). These creatures may appear to be white; however, their fur actually has no pigmentation and is transparent which means it reflects visible light. As a result, they look white due to the snow and ice surrounding them. When their fur is clean and the sunlight is radiating on it, they look the most white. They also can look yellow after feeding on certain prey and receiving their oils. Their fur is also a key adaptation for survival because it allows the animal to withhold heat inside its body. Not only that,

Population of Bears went away from the rest of the species. Because of rivalry for food?? Imprisoned by glaciers and became separated in Arctic. Lots died from the unforgiving/ harsh environment, but those with evolutionary advantage( IE ideal fur colour) stayed alive and reproduced ‘cause paler bears had better advantage owing to the white hue of the habitat, whereas darker fur bears had harder times blending into the frequently icy habitat while hunting. From then, paler bears appeared more often in new generation as mutations & genes continuously happen in meiotic replication, so new alleles for genes occur in the population- ie new alleles for lighter fur colour and hollow insulating shafts were