What is meant by propagule pressure?
Propagule pressure (also termed introduction effort) is a composite measure of the number of individuals of a species released into a region to which they are not native.
What is the propagule pressure hypothesis?
The propagule pressure hypothesis posits that a high propagule pressure is a cause of invasion success; in other words, non-native species with a high propagule pressure have a higher invasion success than non-native species with a low propagule pressure.
What is a plant Propagule?
noun. a plant part, such as a bud, that becomes detached from the rest of the plant and grows into a new plant.
What are the invasion stages?
Many workers consider the process of invasion to comprise three main sequential phases, namely arrival, establishment and spread (Engelkes and Mills 2011), that collectively have generated many ideas to ‘explain’ the fate of alien species as they actually or potentially exploit new environments.
What is a biotic resistance?
Biotic resistance is the ability of species in a community to limit the invasion of other species. However, biotic resistance is not widely used to control invasive plants.
What is the difference between a propagule and a seed?
As nouns the difference between seed and propagule is that seed is (senseid)(countable) a fertilized grain, initially encased in a fruit, which may grow into a mature plant while propagule is a reproductive particle released by an organism that may germinate into another.
What is a mangrove propagule?
Mangrove seeds are technically called “propagules” because unlike most other plants’ seeds, mangrove propagules germinate while still on the tree! This is an adaptation that helps then to grow rapidly upon falling to the soil below once they are ripe.
What is the meaning of biological invasion?
noun. Ecology. The spread of an organism or species into an area formerly free of it, typically with detrimental effects such as the displacement or extinction of native species, destabilization of the invaded ecosystem, etc.; an instance of this.
Do biologists study invasive species?
Forest Service researchers study invasive species biological processes and responses to field conditions to help understand why some species are invasive. Often this information can used to make the pest less invasive.
What is meant by environmental resistance?
: the sum of the environmental factors (such as drought, mineral deficiencies, and competition) that tend to restrict the biotic potential of an organism or kind of organism and impose a limit on numerical increase.
What is biotic abiotic resistance?
Biotic resistance- It is the ability of the native community to keep out invasive species. Abiotic resistance- It is the negative impact of non-living on living factors in a particular environment.
What do you mean by propagation?
: the act or action of propagating: such as. a : increase (as of a kind of organism) in numbers. b : the spreading of something (such as a belief) abroad or into new regions. c : enlargement or extension (as of a crack) in a solid body.
Which is the best description of propagule pressure?
Propagule pressure. Propagule pressure (also termed introduction effort) is a composite measure of the number of individuals of a species released into a region to which they are not native.
How does propagule affect the dynamics of an invasion?
Moreover, propagule pressure may influence invasion dynamics after establishment by affecting the capacity of non-native species to adapt to their new environment ( Ahlroth et al. 2003; Travis et al. 2005 ).
How is propagule pressure related to trade and trade?
Propagule pressure in this context reflects human preferences for particular non-native species, extent of commercial trade between two (or more) countries, and the effort that humans expended in importing and releasing large numbers of non-native individuals.
How does increasing propagule size affect establishment probability?
Increasing propagule size enhances establishment probability primarily by lessening effects of demographic stochasticity, whereas propagule number acts primarily by diminishing impacts of environmental stochasticity.