Population

If the limiting factor chosen is food scarcity, the pigeon population in the town could decrease due to increased competition for limited food resources. This could lead to malnutrition and reduced reproductive success among the pigeons, ultimately resulting in a decline in their population.

Chicago, Illinois but when the University of Nebraska Cornhuskers play at their home stadium, Nebraska becomes the 3rd largest city.

Well, it all depends on the type of graph, if it is a standard graph with proportional diffrerintials then it will be a "J" shape, for example. It would start off low and generally straight, then start to rise and at a certain point given the information shoot up almost vertically then very quickly to a vertical line. But, if it is on a logarithmic graph, then it would be just a diagonal line going up from left to right. Hope everything is cleared up.

The Tibetan antelopes of Hol Xil ( a wildlife reserve in Northwestern China) have been endangered since the 1970s. Excessive poaching has caused their rapid decline. In the past 10 years, their population has increased from less than 20,000 to 60,000, and is still steadily growing.

Consumers in a food chain are organisms that obtain their energy by consuming other organisms. This includes primary consumers (herbivores that eat plants) and secondary consumers (carnivores that eat other animals). Tertiary consumers are at the top of the food chain and typically consume secondary consumers.

the carrying capacity of Karachi is lost due to the massive pollution in capital of the Sindh. if the initiations can not be taken to control the carrying capacity of the city, it may be possible that all resources will be depleted and that create the disturbance in the life standards of the people. it also trigger the massive destruction on the basis of ethnicity between the different ethical inhabitants.

following is the report of an organization that describes in detail about the environmental pollution in the Karachi.

Rising levels of chemicals in the air such as Nitric Oxide and Carbon Monoxide are adding more to Karachi's pollution. Further rise in the toxicity levels of these chemicals will create a catastrophe in all busy hubs of the city that is virtually choking itself.

Critical limits of sustenance with high levels of Nitric Oxides (Nox), Carbon Monoxide (CO) and particulate matter have reached in Karachi and any further addition of any polluting system that may increase their concentration is likely to break hell loose. This has been reported in a recently concluded report on the environmental assessment of Karachi titled 'Feasibility Study and Development of Transportation Control Plan of Karachi Metropolitan', prepared for City District Government Karachi (CDGK). The report conducted by a team of scientists led by Dr Arshad Ali Beg, ex DG Pakistan Council for Scientific and Industrial Research (PCSIR) revealed that the worst pollution was witnessed along the central business district extending from Liaquatabad No 10, Gurumandir, Old Numaish, Moulvi Musafirkhana, Shaheen Complex, Preedy Street, Empress Market, Metropole, Teen Talwar, Gizri Road, Baloch Colony, Mauripur Road, Gul Bai Intersection and Gulshan Chowrangi. According to the study, the major culprits behind this scenario are smoke belching commercial vehicles, inappropriately tuned engines and rickshaws causing din in a city trying hard to catch its breath.

With the ever-increasing number of vehicles on the roads, the total emission from gasoline, diesel oil, LPG and CNG during 2000-2001 was 2,503,791.52 tons/year. With the rise in the number of vehicles to 1.4 million in 2005, the emissions also rose to 4,741,350 tons.

According to the report, the major cause of pollution in Karachi is the smuggled fuel in use. Reportedly, as much as 40 percent fuel being used in vehicles plying on Karachi's roads are from smuggled sources. It is pretty 'unrefined' hence only multiplying its deleterious effects due to higher proportions of pollutants. Improperly tuned up engines are the second main cause of pollution of road environment, which are causing low levels of Oxygen (O2) leading to a reducing atmosphere and consequently higher levels of CO, Hydrocarbons (HC), Hydrogen (H2) and Hydrogen Sulphide (H2S) in the exhaust emissions. Preliminary analysis of data on automobile engine performance indicates that conversion of gasoline driven engines to CNG is causing an increase in NOx emission well beyond the permissible limits suggested by World Bank (WB) as well as World Health Organisation.

Similarly, emission of particulate matter from rickshaws remains high despite their conversion to LPG and their use of cheap lubricants owing on their double stroke engines. It is now a common observation that while driving on Karachi roads even on a balmy evening one experiences nausea, heat and humidity in the immediate surroundings despite being far away from the sea. This coupled with the miasma and an average rise in temperature by 3-5 degree centigrades in the microclimate is a direct result of the pollution around us. The study has also found that the average pollution level of NOx concentration is higher by a factor of 1.14-1.21; CO by 0.67-1.11; particulate matters (PM10) by 1.06-2.06 when compared with that suggested by WB guidelines while the level of SO2 is lower by a factor of 0.38-0.51, and O3 0.16-0.28.

It was found that concentration of total suspended particles (TSP) exceeds 300-450 ug/m3 along the sampled area some of which are open to the flushing action of wind, whereas the WHO limit for suspended particulate matter is 120 ug/m3. Similar is the case with Lead (Pb) and Cadmium (Cd) in TSP whose concentration ranges in each case between 2.5 and 4.12 ug/m3 both show higher values than the limits set by WHO and United States Enviornmental Protection Agency (USEPA). On the other hand, the noise level deviates by a factor of 0.87-0.95 applied on the National Environment Quality Standards (NEQS), which are suggested to be 85 dB(A) exceeding the WB guidelines by a factor of 1.06-1.17. The concentration of CO, NOx, as well as PM10 are in excess of 5 µg/m3, which is the maximum limit suggested by WB guidelines for maintaining the status of air sheds in the unpolluted category. This, according to Dr. Beg "implies that the threshold limits for survival under hazardous environmental conditions have been reached and any further addition to the existing pollution level could be catastrophic." Against this backdrop that one should take note of the WHO reports, which suggest that three million people now die each year from the effects of air pollution.

A study published in The Lancet in 2000, concluded that air pollution in France, Austria, and Switzerland is responsible for more than 40,000 deaths annually. About half of these deaths can be traced to air pollution from vehicle emissions.

In early 80s, perpetual smog would hang over M.A. Jinnah Road during the rush hours. The condition has only worsened more as now the haze hangs virtually on most of the 26 spots sampled for quality of air during the survey provided they are not subject to the flushing action of the wind. The lethal cocktail of ozone, CO2, CO, SO2 and NO reduce oxygen of the surrounding environment and increase humidity. The amalgam proves damaging for the soft tissues of eye, skin, nose, throat and lungs. It has been found that pollutants interact with the blood haemoglobin reducing its oxygen carrying capacity. Out of 200 samples 134 showed significant alteration in the blood picture. Their haemoglobin level on an average was 15.09 g/dl, Red Blood Corpuscles (RBC) 5.36, MCH 28.01; MCHC 31.52; while the eosinophils count was 3.55. In the normal cases, the haemoglobin level is at an average of 16.73 g/dl. The RBC is 5.81, the MCH is 28.65; MCHC is 32.52; while the eosinophils count was 2.57 for subjects who remain at the intersections of the corridors for over six hours.

The report suggest that "since the alteration in blood picture is significant for the type of samples studied, it could be suggested that air pollution related to transportation has an important role in inducing ill-health among the sampled population at the impacted sites." It was also observed that the hearing of about 70 percent of the volunteers at the surveyed sites was also impaired and is mostly related to din and smoke causing rickshaws. The irony is that in 2002, the then DIG Traffic, Saud Ahmad had introduced environmentally sound 'silencers' for the rickshaws which not only contained the harmful particulate matter as well as the deafening pitch, but the project was scrapped following the DIGs transfer.

Back in 2002, a medical study involving nearly 1000 traffic cops was conducted to find out the impact of environmental pollution on their health. Saud Ahmad who also headed the Police Public Medical Care Project found horrifying scenario commissioned the study. According to Dr. Syed Safdar Hussain who examined the traffic police, as many as 80 percent cops reported chronic ENT problems, 40 percent showed signs of problems associated with lungs some of which developed into asthma and TB. Due to nearly 10-hour job on the road amidst smoke and blowing horns almost 90 per cent showed symptoms of irritability and tension; 45 per cent of the cases ranging in 35 to 50 years of age suffered from hypertension. Most of these traffic cops had 10 years of service and they manifested body pains as well. However, these figures were not absolute as they needed a much-detailed study and these disorders can't be taken in isolation as they are also related to nutrition levels.

However, the fact remains that pollution genie is out of the bottle horrifying both the oblivious and clueless citizens and an insensitive government.

The following links shows the overall mean values of the maximum, minimum and averages of the different pollutants and noise levels at the different observation points:

http://jang.com.pk/thenews/jun2006-weekly/citypulse-05-06-2006/index.htm#1

http://asp.isb.sdnpk.org/sdnpnews/search_detail1.asp?newsID_form=50417

Densely populated areas have more units per unit of area than moderately populated areas.

Example: If 100 people in a store is densely populated; 75 in a store of the same size would be moderately populated.

Density-dependent limiting factors include competition, predation, parasitism and disease. So this effects populations when populations become crowded and organisms need to compete essentials. When predators and parasites start to kill organisms.

The population density of the taiga plains varies depending on location and human activity. Since taiga plains are mainly composed of forests with sparse human settlements, the population density is generally low compared to other regions. Wildlife is more abundant in this area than human inhabitants.

In a balanced ecosystem, the populations that should be largest are typically the primary producers, such as plants, as they form the basis of the food chain. The populations that should be smallest are usually the top predators, as their numbers are naturally limited by the availability of prey and resources.

The animal population refers to the total number of animals within a specific geographic area or ecosystem. It can include various species and is often studied to monitor population trends, ecological impacts, and conservation efforts. Tracking animal populations helps researchers and conservationists understand the health and dynamics of ecosystems.

Some of the factors include:

-Population Momentum

-Affluence

-Technology

-Whether or not a country is Developing/Developed

-Disease

-Immigration and Emigration

-Respect for Women ( countries that treat women as second-class citizens often have higher fertility rates)

-Epideimiologic Transition

-Birth Rate

-Death Rate

The population grew slowly for most of human existence due to high mortality rates, limited resources, and lack of medical advancements. Disease, famine, and conflict were common causes of death, leading to a lower life expectancy and hindered population growth. Additionally, societies were predominantly agrarian with limited technology to support larger populations.

In recombination, cross-overs exchange alleles between homologous chromosomes during meiosis in both parents. This is what allows for much of the genetic variation in the offspring of a population in each generation.
Sexual recombination works in three different ways. First, chromosomes of the male and female exchange genetic material in the process of crossing over. Secondly, the tetrads in meiosis have two different ways to independently orient themselves in prophase I, And lastly fertilization is a completely random process.

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Approximately 81% of tsunamis occur within the Pacific Ocean's "Ring of Fire," which is a horseshoe-shaped area with intense seismic activity. The remaining 19% can occur in other ocean basins due to underwater earthquakes, landslides, volcanic eruptions, or meteorite impacts.

zpg is a characteristic of too many people here already !!! this many people are not being sustained on this planet... even w/ better management of food resources water will become scarce... get smart people - replace yourselves & no more !!!

It erodes rocks on steep hills because the rain is slightly acidic so the acid (carbonic acid) and when the rain falls on those rocks it dissolves them slowing turning them into sediment! :)

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Not quite.

Carbonic acid only attacks calcium carbonate, magnesium carbonate and calcium sulphate (the essential minerals of limestone & chalk, dolomite and gypsum, respectively), although water will hydrolyse some other rock minerals very slowly. The dissolved minerals are carried away in solution, not as sediment; but the rocks' insoluble constituents do become sediment.

An upland stream can erode rock rapidly thanks to its higher gradient hence speed, but against that the further uphill you find the stream, the smaller its volume.

I know Maldives is only 1 metre above sea level the first country to go if we don't collectively do something about global warming. I too would like to know what other countries maybe next in line to drown.

In the exponential model of population growth, the growth rate remains constant over time. This means that the population increases by a fixed percentage during each time interval, leading to accelerating growth over time.

As of 2021, the estimated population of Blackland Prairie, Texas, is around 18,000 people.

There are many ways in which people and the government manage population change.

There are many real-life examples of how to control overpopulation. China, the world's most populous country, has implemented the one-child policy. This limits majority of the couples in China to have only 1 child, vastly reducing the population. India, which is currently facing severe overpopulation, is implementing numerous measures to counter overpopulation. Firstly, we have the use of contraceptives. Contraceptives are given out to people in India, encouraging them to use it to prevent pregnancies. In some places, forced abortions are carried out to prevent increase in population. The government has also put in plans to educate women, both on sexuality issues as well as financial independence. Educating women on how to do jobs can make them financially independent, without the need to rely on their husbands. This will definitely increase their status both in the family and socially, and thus will not be controlled by their husbands. Also, when women are doing jobs, they have less time to have children.

When facing underpopulation, the government will usually encourage the people to have more children by providing them with incentives to make their lives better. Most of the time, the government will aid and provide the children with better education, healthcare and so on, increasing the chances of couples having more children.

In both cases, advertising are equally important. Banners, TV ads, posters etc. are used to spread awareness to the people and encourage them to do the right thing.

From another aspect, in population change, mainly population increase, more towns and urban areas are built to accomodate the rising population to prevent overcrowding.

Estimating the size of a population of animals can be difficult because animals move around, making them hard to track. Additionally, some animals may be hidden or hard to see in their natural habitat. Counting every individual is often not feasible, so scientists use statistical methods and sampling techniques to estimate population size.

The Kenyans Enumerators are going to be paid Ksh. 1500 * 7 days for the work they did!!Let us not anticipate getting paid Ksh. 24,000/= by the contracts signed for!!This is the big fish and small fish issue!!!

Europe has become the new home for many millions of immigrants, legal and illegal, from other parts of the world. A substantial part of the population growth is from these immigrants and their offspring.