Do alien species have to be invasive species? What are the criteria for determining invasive species

Not all alien species are invasive. Criteria for determining invasive species: introduction into a non-native area through intentional or unintentional human activities; self-regeneration capacity is formed in local natural or artificial ecosystems; Significant damage or impact to local ecosystems or geographic structures.

These knowledge points are analyzed and explained in detail in the 101 education ppt, which is of great help to the consolidation of knowledge points.

In biology, an alien species is a species, subspecies, or lower taxa that refers to its natural range and location, including any part, gamete, or propagulate of these species that can survive and reproduce. Alien species invasion refers to the process of biological species migrating from their place of origin to the new ecological environment through natural or man-made means, which has two meanings: first, the species must be alien and non-native; Second, the alien species can settle, reproduce and spread in local natural or artificial ecosystems, and eventually significantly affect the local ecological environment and damage local biodiversity. Invasive alien species can disrupt the naturalness and integrity of landscapes, destroy ecosystems, endanger plant and animal diversity, and affect genetic diversity.

Ecosystems have evolved over a long period of time, and the species in the system have gone through hundreds of thousands of years of competition, exclusion, adaptation, and mutual benefit, forming the close relationship of interdependence and mutual constraint that we have today. When an alien species is introduced, it may be excluded from the system because it cannot adapt to the new environment; It is also possible that because there are no competing or constraining organisms in the new environment, the introduced species may become a real invader, upsetting the balance and altering or destroying the local ecosystem.

Originally, there was no natural distribution in the local area, because of factors such as migration and dispersal, human activities, etc., species appeared outside their natural range.

Among the alien species, some species are intentionally introduced from one place to another by humans because of their use, and these species are called introduced species, such as California honey plum, American cherry, wild soybean, etc.

Most of these species need to be cared for to survive and are not harmful to the environment.

Criteria: 1. Introduced into a non-native area through natural causes or intentional or unintentional human activity.

2. Self-regeneration capacity has been formed in local natural or man-made ecosystems. It has a high growth rate, strong reproductive ability and the ability to spread quickly.

3. It can tolerate various environments, and can change the growth pattern to adapt to the existing environment, causing obvious damage or impact to the local ecosystem or geographical structure.

a.Generally refers to alien species that move from one country to another or from one natural ecosystem to another, establish populations in natural or semi-natural ecosystems or habitats, and affect, threaten and destroy local biodiversity.

b.Pest species containing socks in the area.

c.Species that move from one region to another.

d.Species that enter from one country to another.

Correct Answer: a

The difficulty in distinguishing between invasive alien species is whether they are intentionally introduced or unintentionally introduced.

Invasive alien species are species that have been introduced from their natural ranges through intentional or unintentional anthropogenic activities, developed self-regeneration capacity in local natural or semi-natural ecosystems, and caused significant damage or impact to local ecosystems or landscapes. These invasive species grow wildly, invading grasslands, woodlands and wastelands, and soon form monospecies dominant communities, leading to the decline of the original plant communities. It is related to economic and social development, affecting human health, agricultural potential, ecosystem balance, biodiversity conservation, and with the development of global **, opening up, global change and changes in land use patterns will become more and more serious.

If the new environment is not controlled by natural predators, coupled with vigorous fecundity and strong competitiveness, alien species will become invaders, crowding out native species in the environment, destroying the local ecological balance, and even causing harmful effects on the human economy. Such alien species are collectively referred to as invasive species, such as red fire ants, snails, Baglotus, African giant snails, Brazilian tortoises, pine wood nematodes, etc.