A Population in an ecological perspective refers to a group of organism that are of the same species interacting with one another and their environment. For these organisms to be classified as the same species, they would need to be able to interbreed with one another. A population can consist of animal, plants, bacteria, or any other organism that are able to reproduce and live together. Metapopulation is defined as a set of local populations occupying a range of habitat patches and linked by the movement of individuals through migration. There are small “island” patches that are within dispersal distance of a larger “mainland patch.” When organism migrates to the poorer and smaller “island” patches, this explains source-sink dynamics. Without
A different scenario takes place when an alien species is transported to a new area. Although direct competition with similar species is still a problem, the new kid in the block may have no natural pests and diseases. Thus, large stands of monocultures can occur. It is generally accepted that one plant species will support 10 species of animals. If one species takes over 99% of a given habitat dozens if not hundreds of species are lost from that area and some populations are stressed enough that extinction is possible.
When it comes to genetic diversity and migration, migration is known as the movement of genetic diversity within a species. Migration of genes not only happens in animals but also in plants through pollen dispersal, vegetative propagules like rhizomes and suckers among others. Migration or in other term gene flow, is said to take place both with the proceeding front of a population when it is colonizing new areas. This happens when genes of two or more populations mix through pollen and seed dispersal. In this case, migration rate is mainly related to the frequency of reproduction and the distance over which seeds and pollen usually disperse.
Biodiversity is influenced by landscape fragmentation at various scales of space and time. The extinction of ecosystem types and component species may cause an increased patchiness of the landscape, resulting in lower population sizes and decreased connectivity. As a result, inhabitants may experience decreased dispersal abilities and lowered gene flows between populations.
1. Demography is a discipline in Ecology that deals with population measures such as, age, size and overall structure are critical to demographic work. Demography is used to help understand a population’s growth pattern, although not all individuals are the same age and size or have the same survival and birth rates. Demography allows for greater depth and detail of a population’s structure to be characterized and analyzed.
A population is a group of species that live, interact, and interbreed in a geographic area. Intraspecific competition occurs when resources, which are necessary for a population, are limited and the individuals of the same species have to compete to survive. The Tribolium species reproduce at a rapid rate. The female lays 400-500 eggs that go through metamorphosis and within a few days, those adults are sexually mature and continue the reproduction process (Calderwood 1961).
The Social – Ecological Model is a framework for prevention and the ultimate goal of this model is to prevent unhealthy behaviors for children. This model contains five levels that make up a students environment and each factor plays a role in the child’s health. The first level of this model is the child’s individual self. This level plays off of the child’s attitudes and beliefs, any impulsive or anti social behavior, if the child has a history of sexual abuse or has witnessed any violence in their lives. This level also has to deal with the use of any recreational drugs and alcohol. The second level is based on the relationships that the child builds and how those relationships impact that child’s life. The relationships include
You have taken a lead teacher position in a preschool program. A parent asks you to explain the program’s constructivist philosophy.
Since being developed by Bronfenbrenner in 1979 social ecological perspectives have been widely used to formulate practice guidelines and government policies when planning service needs for children, young people and their families. This essay will discuss what a social ecological perspective consists of, what limitations it may incur and how it can assist us in developing best practice and understanding when working with children, young people and families. It will draw on examples from K218 for illustrative purposes.
Humans have greatly impacted the global environment. Throughout the course of history, human populations have rapidly increased. Especially in Africa, these numbers have reached extraordinary proportions. Out of all the continents in the world, Africa’s population is increasing the most. The type of growth here is exponential. “Overpopulation is a condition when an organisms numbers exceeds the carrying of its ecological niche.” The growth rate of a population is equal to the birth rate minus the death rate. Therefore, for overpopulation to occur, the birth rate must surpass the death rate (Wiley). The current population of Nigeria is estimated to be 155,215,573. Most of the population consists of the younger generation. More specifically, 41% of the population is between the ages of 0-14. 56% of the population is between the ages of 15-64. However, only 3.1% of the population is 65 and over. This age group represents a very small part of the population. (CIA)
Examine critically the Equilibrium Theory of island biogeography. In your answer you are expected to critique its validity and practical usefulness. An Island is undoubtedly an appealing study unit. It is less complex than continents or oceans, a visibly distinct object that can be labelled with a title and its resident populations identified thereby (MacArthur RH, Wilson EO, 1967). From a perspective of biogeographical science, MacArthur and Wilson proceed to state that islands are the first units an individual can discover, investigate and begin to understand.
On the first level, when foreign, but previously non-invasive species is first introduced to a new area, the new species may play a role in a community that was previously unfulfilled; it may fill a vacant niche in the ecosystem. Originally this new species may be seen as a useful contributor to its new surroundings because it has only (temporarily) increased biodiversity in the area (Meinesz, 2003).
Migration is the movement of organisms from one location to another, migration when used in a population genetics context often refers to the movement of individuals into or out of a defined population. A sudden influx of alleles is provided when the migrating individuals stay and mate with the destination individuals. After mating is established between the migrating individuals and destination individuals, different types of gametes carrying alleles that can alter the existing proportion of alleles in the destination population is contributed by the migrating individuals.
Populations contain very delicate and reactive relationships between species. These populations can be largely impacted by small changes such as weather or climate. Most populations stay relatively balanced by predators or limited food sources. Populations are sometimes directly correlated to each other and when one gets too large they either get killed by the other or starve from competition over food. Our experiment was designed to answer the question, which factors affect the stability of a predator-prey population size relationship? This shows how populations balance each other out. Our claim was that if there is a higher amount of time needed for the re-growth of the grass, the amount of sheep, and therefore wolves, will go down.
Humans have many effects on the ecosystem that lower population and communities of other organisms. Although society cannot prevent all actions other people do towards the ecosystem, people can prevent a few in their day to day lives. The ecosystem is very important to human life, as it gives the atmosphere oxygen to breath. Over many years of careful examination, scientists have noticed huge changes in the ecosystem due to human actions, concluding with damaging results. Therefore human actions have many effects on the ecosystem.
Our world is too small for our ever rapidly growing population. One day resources will run dry and vanish, which will bring death and loss to all nations on this planet. Many researchers and scientists have confirmed that the population will reach 10 billion by the end of the century and will continue to stream upward. There are many different ways in trying to decrease population to contain global warming and assist our environmental changes. The only way to steadily succeeding, families must be the regulators of their fertility and future. Environmentalism can head in a negative direction, which may result in population control and even anti-immigrant policies. Can the developing effort of ‘population integrity’ protect our world while recognizing birth moralities?