AP Environmental Science: Chapter 5 1. Explain how southern sea otters act as a keystone species in kelp beds. The otters help to keep sea urchins and other kelp-eating species from depleting highly productive and rapidly growing kelp forests, which provide habitats for a number of species in offshore coastal waters. Without southern sea otters, sea urchins would probably destroy the kelp forests and much of the rich biodiversity associated with them. Explain why we should care about protecting this species from extinction. People love to look at these charismatic, cute, and cuddly animals as they play in the water. As a result, they help to generate millions of dollars a year in tourism income in coastal areas where they are found. Another …show more content…
Most populations live in clumps because the resources a species needs vary greatly in availability from place to place, so the species tends to cluster where the resources are available. Second, individuals moving in groups have a better chance of encountering patches or clumps of resources, such as water and vegetation, than they would searching for the resources of their own. Third, living in groups protects some animals from predators. Fourth, hunting in packs gives some predators a better chance of finding and catching prey. Fifth, some species form temporary groups for mating and caring for young. 6. Describe four variables that govern changes in population size and write an equation showing how they interact. Four variables – births, deaths, immigration, and emigration- govern changes in population size. A population increases by birth and immigration (arrival of individuals from outside the population) and decreases by death and emigration (departure of individuals from the population): Population change = (Births + Immigration) – (Deaths + Emigration) Age structure: Percentage of the population (or number of people of each sex) at each age level in a population. What are three major age group categories? 1) Organisms not mature enough to reproduce (the pre-reproductive age) 2) Organisms capable of reproduction (the reproductive stage) 3) Organisms too old to reproduce (the post-reproductive
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For example there has been an increase in immigration population and trends after World War 2 and will be more of an increase in the 21st century. This resource also explain how immigration has a large impact on the size of the active labor force, which could be a concern for demographers and economic forecasters as who will pay for future social programs. The author is fluent and articulate when presenting ideas and information throughout the text. The author also presents references when presenting facts and ideas to back up their concepts making this resource dependable.
A population increase
The trichechus most commonly known as the manatee is a large aquatic mammal with ancestors dating back to 45 million years. The modern manatee has been found in fossil evidence to have existed for at least 1 million years. Living in shallow bodies of fresh and saltwater the manatee is mostly a gentle solitary animal, with highly developed social skills. While different variations of the manatee live across the world, all manatees are slow moving herbivores with very few natural predators. While the manatees are rather slow animals they are agile and can easily maneuver underwater.
A. Maryland has fewer trees B. Nevada had more fish C. Maryland had more open waters * D. Nevada has less small animals • Why would the habitats of Maryland and Michigan support more breeding pairs than habitats in other states? A. Grasslands provide homes for large animals. B. Mountains provide fewer places to hunt. C. Large lakes and rivers provide food. * D. Croplands provide grain for food.
The goods that were exchanged had a significant impact on the environment and the civilizations. Demographic changes are changes with the human population based on size, structure, and distribution. Environmental
Small things really make a big difference in keeping these creatures safe. In fact, by keeping these creatures safe, they are now out of the endangered species population by number. They are now close to be considered protected instead of endangered! That is huge and it is all because of our FWC and our captains and boaters that are obeying the set of rules
301) Rose responds to objections to marine sanctuaries by emphasizing the support for keeping orcas out of captivity. In paragraph 7, she states that initially only the animal welfare and animal rights community fought for this idea as the marine theme parks kept ignoring them. Such objections to orca captivity are now seen by SeaWorld supporters themselves. The factors caused from captivity that result in the death of these creatures, has persuaded people to find a new approach to this issue.
The lecturer and the reading passage offer two theories to explain why the sea otter population is in rapid decline. The two theories are predation theory and pollution theory. The professor argues predation is the more likely cause than pollution because of the absence of dead sea otters washing up on shores. However, the reading passage attributes the decline of the sea otters population based on evidence of increased ocean contaminates leading to greater vulnerability to infections.
Sea mammals are an important species in general, so Alaskans like to keep them protected. An office named “Marine Mammals Management” was created to keep these species safe (Fishing in Alaska). One of the most important sea mammals would be the sea otter. These little creatures play a huge ecological role for the environment. Big game animals can be from a dozen of a different animals.
This exposure and education motivate people to protect the animals and provide entertainment. Zoos save endangered species by bringing them into a safe environment, where they are protected from poachers, habitat loss, starvation, and predators. “The Arabian Oryx was hunted to extinction in the wild. However, from just a handful of animals in captivity the species was brought back from the brink thanks the conservation efforts of Phoenix Zoo and others.
Background Jakarta has a population of about 9.6 million people and in the last three decades, urban development of Jakarta has grown very rapidly in many sectors starting from industry, trade, and transportation until real estate. The increase in Jakarta’s population and urban development had cause several environmental problems including land subsidence. Land subsidence is a gradual settling or sudden sinking of the Earth 's surface owing to subsurface movement of earth materials. The level of soil in Jakarta is slowly degrading due to the disturbance of the soil consistency, and the water level in the soil is slowly decreasing, and now the sea level in Jakarta is higher than the ground level. In another word, Jakarta has been experiencing
Population size may vary as individuals are born or immigrate and other may die or emigrate. One model of population growth is the exponential Population Growth; which is the accelerating increase that occurs when growth is unlimited. It predicts that the larger the population is, the faster it grows. This growth model is normally for short lived organisms due to the introduction of a new or underexploited environment. Next, there is the Logistic Population Growth.