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Invasive Species (Test 2)

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amsykes's version from 2018-04-16 16:18

Section 1

Question Answer
What is an invasive species?An organism that evolved in one area snd was introduced into another ultimately area, and whose presence leads to detrimental effects
What is an introduced species?Though an organism that evolved elsewhere and was introduced may or may not represent deleterious effects to the system
Are exotic and non-native organisms considered invasive or introduced species?Exotic and non-native species could be considered invasive or introduced depending on their impacts or lack thereof
What is an example of an introduced species?The southern Hill Mina bird is an introduced Asiatic bird that only live in disturbed habitats and compete with other introduced or invasive species in the region but not the native bird species.
From and ecological perspective how can introduced or invasive species cause changes in trophic dynamics?Both have an impact on the flow of energy (net loss energy) because they interrupt trophic structure because they did not evolve over millions of years in non-native location
Though many introductions are not problematic, what characteristics can cause negative impacts?r selected life history and generalist strategies (reproductive and ecological opportunists)
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Section 2

Question Answer
What are r selected characteristics associated with invasive species?1. High fecundity 2. Short life spans 3. Little parental care
What are generalist characteristics associated with invasive species?1. Habitat generalist 2. Omnivorous 3. Colonizing species that monopolize resources
What is a deleterious impact caused by invasive species?Direct competition with species occupying preferred niches
What are four characteristics that are more successful in acquiring niche space?1. Larger than native 2. Heightened level of territoriality 3. Habitat generalist 4. Evolved in a system with a high-level of competition
Who proposed the theory that states a successful invasive species is able to successfully pass a series of biotic bottlenecks and not be filtered out?Carlton and Rade (1985)
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Section 3

Question Answer
According to Carlton and Rade (1985) represent important and potentially deleterious invaders?Species that can pass through these biotic filters and not be eradicated by native species and environmental factors
What are the three variables included in Carlton and Rade's (1985) theory?1. Biogeographical filter 2. Physiological filter 3. Biotic filter
What are six characteristics within ecological communities that make them more easily invaded?1. Disturbed habitat 2. Ecotones (edge habitats) 3. Areas with a large no. of endemics 4. Islands 5. Transitional habitats (plains into forest and the areas in between), and aquatic communities
What are the three primary means of introduction?1. Accidental including unnoticed through anthropogenic activity 2. Escape from controlled settings 3. Intentional that is either reared for financial gain or introduced by irresponsible owners
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