The Evolutionary History of Baleen Whales
Dailynn Tejeda
Hazleton Area Academy of Sciences
The Evolutionary History of Baleen Whales The baleen whale family houses the largest whales that are currently known to man, leaving many scientists questioning as to how, and why, these whales evolved to become so humungous, when millions of years ago they were much smaller. Questions as to how they evolved to only feed on minuscule prey are also raised when speaking about baleen whale evolution. The evolutionary history of these whales that caused their dramatic enlargement and the change in their prey, was triggered by several different factors: an ice age several million years ago and the seasonal availability of their prey.
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Antarctic white-out drove baleen whale evolution. General format. Retrieved from http://web.a.ebscohost.com/ehost/detail/detail?vid=20&sid=e879ad74-8b5c-417d-9812-9d20d4414b11%40sessionmgr4010&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#AN=87337904&db=ulh Seth Borenstein (5/24/2017). Whale of a mystery solved? How They Got So Big. General format. Retrieved from http://web.a.ebscohost.com/ehost/detail/detail?vid=31&sid=e879ad74-8b5c-417d-9812-9d20d4414b11%40sessionmgr4010&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#AN=AP003a0f288ff244119e053bd07f53107f&db=n5h Thomas A. Demere. Michael R. McGowen. Annalisa Berta. John Gatesy. Morphological and Molecular Evidence for a Stepwise Evolutionary Transition from Teeth to Baleen in Mysticete Whales. General format. https://academic.oup.com/sysbio/article/57/1/15/1698976 Townsville Bulletin (8/17/2006). `T-rex of the deep' who is now a toothless giant. General format. Retrieved from
The Bering Strait did not provide much vegetation, which lead to less animals to be hunted. The early people had to make do with smaller mammals for food resources. It is theorized that larger mammals, such as wooly mammoths, would not be able to survive on the little vegetation that grew on the Bering Strait. Towards the end of the ice age the Bering Strait started to get smaller causing the few animals that
Blackfish written by Gabriela Cowperthwaite. From the start attraction at Sealand of the Pacific in 1969, the aquarium grew attention for their orcas that would perform. Years later a two year old whale was captured and arrived in 81’. His name was Tilikum, coming in at two years old and 4,000 pounds. How do you go about taking orcas out of their setting, changing how they feel, and go about certain lies of how situations occurred?
The invertebrates that form the gray whales primary prey are restricted to shallow water environments, but global sea-level changes during the Pleistocene eliminated or reduced this critical habitat multiple times. Because the fossil record of gray whales is coincident with the onset of Northern Hemisphere glaciation, gray whales survived these massive changes by adapting their feeding habits. When continental glaciers locked up vast quantities of the earth 's water, ocean levels dropped up to 400 feet. This transformed what is now the sea bottom into wind-scoured steppes. At the height of the ice age, most of the modern gray whale food source would have been high and dry, and yet, the whales survived.
Hannah Ton Mrs. Braun Honors American Literature 1 November 2015 SeaWorld Orca Breeding Should Not Be Continued When Dr. Heather Rally, a veterinarian who specializes with marine mammals, visited SeaWorld, she witnessed an orca with a severely collapsed fin and asked an “educational” guide why its fin was bent. The guide replied that it was a genetic trait just like curly or straight hair. However, Rally knows the truth, scientific evidence suggests that the high rate of dorsal fin collapse in captive orcas is due to conditions of captivity. These include spending an abnormally long time at the surface in direct sunlight and continuously swimming in tight circles.
In the other hand, the speaker contends this by explaining that whales were declined because of the human hunting , orcas changed their diet to survive and because just of the sea mammals were available, human started to hunt sea mammals and cause the decline. Third, the author asserts that scientist believed that the pollution hypothesis could also the uneven pattern of otters decline. However, the professor opposes this pint by explaining that the uneven pattern is better explained by orcas predation theory. she added that it depends on whether the location is accessible by orcas or not, so because orcas are large, they can 't access the shallow region where sea otters have not
Due to the fact that orca whales travel throughout the oceans in the killer whale 's’ life, captivity takes a greater toll on the whale 's bodys’. The whales face panic attacks, depression, and self enduring harm when unable to travel the
Im am going to tell you about humpback whales.(what your thinking inside your head: Fantastic!!!!!!)Humpback whales weigh about 79,000ib, they’re fabulous. Male humpbacks sing a annoying lonely moaning noise that last to 10 to 20 minutes, and as a annoying super bonus they can do this hours at a time!(WOW)Humpbacks basically migrate up to 16,000 miles,(i'm saying this sarcastically excited)so they can spread they’re annoying moaning noise across the world, yay! Horray for annoying lonley moans that spread across the world and wake everyone up at 3 in the morning on a work day, yay! Now I have told you facts about humpback whales
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
Territories border a specific species’ personal space, the Orinus orca is no stranger to this as any other living thing. What makes the whale’s reputation “killer” is its compliance to territories. Killer whales are innocent, but immature. Their actions prove them to be “killer” as witnesses say, but do they really think on the Orinus orca’s perception of the situations of violence they are involved in? Killer whale’s do what any other wild animal does, and when captive it is no surprise they would do the same.
Also, the lecturer argues that orcas are likely factors in the population decline of the sea otters because of the scarcity of their usual prepay. This left them with no other option but to hunt smaller mammals for food. The reading passage refutes this theory
Sharks: The Evolution For roughly 420 million years, the greatest predator of the ocean has been swimming freely around in the water (450 Million Years of Sharks). Fish scurry away escape the rows of teeth in the jaws of a shark. With over 400 species of shark, how did they all get here? (A Timeline of Shark Evolution). Most importantly, how did they get such unique features that help them become the rulers of the ocean?
This article from Killer Whale. Org is an informative document detailing information regarding the killer whale species. This article includes information about their origin, habitat, culture, social structure, and the captivity trade. This source is trustworthy because the information that is within the article directly comes from BioExpedition, a publication that contains factual data from noted scientists and biologists in the field. This source is also trustworthy because the research that has been conducted has been vastly accepted as fact by the marine biology community.
Andre Cole Ricardo Acosta G. English 101 September 22, 2015 Do Killer Whales Actually Belong in Captivity? Ever since wild animals such as Killer Whales have been captured and kept in theme parks and zoos as amusement, there have been issues on whether they should or shouldn’t be kept in captivity. Killer Whales, otherwise commonly referred to as Orcas, have regularly been taken away from the sea at a very young age so they can be trained, raised and kept in theme parks for exhibition. Although theme parks no longer capture whales from the wild, they are still bred in captivity for public display at marine parks such as Sea World (Gorman).
Humpbacks are baleen whales that use bristles to filter their food out of mouth fuels of seawater. Their diet consists mainly of plankton and krill, as well as small schooling fish. Whales, include the largest animals in all of life on Earth, and are a curtail part of the ecosystem today. They have high metabolic demands and when they were in larger populations, before industrial whaling, whales would have had a strong influence on marine ecosystems, even greater than today. They play several environmental roles including, consumers of several species, prey to large bodied predators, reservoirs of nutrients, and detrital sources of energy and habitat in the deep sea.
The interactions between humans and dolphins started centuries ago when our ancestors carved drawings of cetaceans on rocks and passed on legends and folk tales; some described them as beasts and others as spiritual creatures. These marine mammals are also hunted as long as three thousand years ago as resources: their meat for food; their blubber for oil, and their teeth and bones for clothes, jewelry, or tools (Bauer, McCafferty, Simmonds, & Wright, 2013, p.201). As time pass, dolphin and whale hunting became a more prominent and structured industry, and the knowledge about these marine mammals’ biology and behaviors grew. In recent decades, with the help of ample media exposure and scientific publications, the public shifted its attitude