Introduced animal species in australia biology essay

A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation for example, the large muscles of a weightlifter. Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment. Also used to describe the process of genetic change within a population, as influenced by natural selection. A graph of the average fitness of a population in relation to the frequencies of genotypes in it.

Introduced animal species in australia biology essay

Human timeline and Nature timeline The formal definition of an introduced species, from the United States Environmental Protection Agencyis A species that has been intentionally or inadvertently brought into a region or area. Also called an exotic or non-native species. Examples of these terms are acclimatized, adventivenaturalized, and immigrant species but those terms refer to a subset of introduced species.

The term "invasive" is used to describe introduced species when the introduced species causes substantial damage to the area in which it was introduced. A naturalized plant species refers to a non-native plant that does not need human help to reproduce and maintain its population in an area that it is not native to.

General description of introduced species: In the broadest and most widely used sense, an introduced species is synonymous with non-native and therefore applies as well to most garden and farm organisms; these adequately fit the basic definition given above.

However, some sources add to that basic definition "and are now reproducing in the wild", [3] which removes from consideration as introduced species that were raised or grown in gardens or farms that do not survive without tending by people.

With respect to plants, these latter are in this case defined as either ornamental or cultivated plants. Invasive species[ edit ] Introduction of a species outside its native range is all that is required to be qualified as an "introduced species" such that one can distinguish between introduced species that may not occur except in cultivation, under domestication or captivity whereas others become established outside their native range and reproduce without human assistance.

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Such species might be termed "naturalized", "established", "wild non-native species". If they further spread beyond the place of introduction and cause damage to nearby species, they are called "invasive". The transition from introduction, to establishment and to invasion has been described in the context of plants.

Invasive species are those introduced species that spreadwidely or quickly and cause harm, be that to the environment, [5] human health, other valued resources or the economy. There have been calls from scientists to consider a species "invasive" only in terms of their spread and reproduction rather than the harm they may cause.

The term is used to imply both a sense of urgency and actual or potential harm. Executive Order defines "invasive species" as "an alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health".

Although some argue that "invasive" is a loaded word and harm is difficult to define, [3] the fact of the matter is that organisms have and continue to be introduced to areas in which they are not native, sometimes with but usually without much regard to the harm that could result.

From a regulatory perspective, it is neither desirable nor practical to list as undesirable or outright ban all non-native species although the State of Hawaii has adopted an approach that comes close to this.

Invasive species: Invasive species, any nonnative species that significantly modifies or disrupts the ecosystems it colonizes. Such species may arrive in new areas through natural migration, but they are often introduced by the activities of other species. Human activities, such . Botany, branch of biology that deals with the study of plants, including their structure, properties, and biochemical processes. Also included are plant classification and the study of plant diseases and of interactions with the principles and findings of botany have provided the base for such applied sciences as agriculture, horticulture, and forestry. acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large.

Regulations require a definitional distinction between non-natives that are deemed especially onerous and all others. Introduced pest species that are officially listed as invasive, best fit the definition of an invasive species. Early detection and rapid response is the most effective strategy for regulating a pest species and reducing economic and environmental impacts of an introduction [8] In Great Britainthe Wildlife and Countryside Act prevents the introduction of any animal not naturally occurring in the wild or any of a list of both animals or plants introduced previously and proved to be invasive.

Introduced animal species in australia biology essay

Nature of introductions[ edit ] By definitiona species is considered "introduced" when its transport into an area outside of its native range is human mediated. Introductions by humans can be described as either intentional or accidental.

Introduced Species: Friend or foe? - Australian Museum

Intentional introductions have been motivated by individuals or groups who either 1 believe that the newly introduced species will be in some way beneficial to humans in its new location or, 2 species are introduced intentionally but with no regard to the potential impact.

Unintentional or accidental introductions are most often a byproduct of human movements, and are thus unbound to human motivations. Subsequent range expansion of introduced species may or may not involve human activity. Wheat Triticum introduced worldwide from its place of origin Mesopotamia.

Intentional introductions[ edit ] Species that humans intentionally transport to new regions can subsequently become successfully established in two ways. In the first case, organisms are purposely released for establishment in the wild.

It is sometimes difficult to predict whether a species will become established upon release, and if not initially successful, humans have made repeated introductions to improve the probability that the species will survive and eventually reproduce in the wild.

In these cases it is clear that the introduction is directly facilitated by human desires.


Male Lophura nycthemera silver pheasanta native of East Asia that has been introduced into parts of Europe for ornamental reasons. In the second case, species intentionally transported into a new region may escape from captive or cultivated populations and subsequently establish independent breeding populations.A must-read for anyone who wants to participate in schwenkreis.coms.

This article lays out the land for evolutionists and creationists alike, presenting the concepts of and the evidence for biological evolution. To arrive at the edge of the world's knowledge, seek out the most complex and sophisticated minds, put them in a room together, and have them ask each other the questions they are asking themselves.

In the s and s the so-called modern synthesis connected natural selection and population genetics, based on Mendelian inheritance, into a unified theory that applied generally to any branch of biology.

The modern synthesis explained patterns observed across species in populations, through fossil transitions in palaeontology, and complex cellular mechanisms in developmental biology.


The Holocene extinction, otherwise referred to as the Sixth extinction or Anthropocene extinction, is the ongoing extinction event of species during the present Holocene epoch, mainly as a result of human activity. The large number of extinctions spans numerous families of plants and animals, including mammals, birds, amphibians, reptiles and arthropods.

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Introduced animal species in australia biology essay

Please address correspondence to Dr. Price, Carpenter Hall, Cornell University, Ithaca, NY Scientific Journal Articles Provides selected resources for citations, with some links to fulltext, for articles from scientific, scholarly, or professional journals for general invasive species.

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