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9 Cards in this Set
- Front
- Back
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What is a succinct definition of biodiversity?
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Biodiversity is the sum total of all living things. The immense richness and variation of the living world.
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What does the Rarity-Weighted Richness Index aim to capture in terms of overall biodiversity?
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It combines the alpha and beta diversity into a single number to show the species richness in that particular area. Divide map into cells, count the number of species in each cell. The larger the number the less diverse. Small numbers are good.
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List 4 ways in which habitat fragmentation differs from natural heterogeneity.
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Short, Human caused, lethal, no smooth transition, patches
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What is a keystone species and what does the concept suggest about how communities are structured?
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Keystone species is a species that plays a critical role in maintaining the structure of an ecological community and whose impact on the community is greater than would be expected based on its relative abundance or total biomass.
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What 'filters' does an exotic species have to overcome in the process of establishing itself in a new community? Which of these filters is particularly impacted by humans and how?
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Humans facilitate in movement of invasive creatures, ballast movement from harbor to harbor. Or snakes to Hawaii. Biogeographic, physiological, biotic, local assemblage are the filters.
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What is the difference between habitat loss and habitat degredation?
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Habitat degredation is the impacts that affect many, but not all species and may be temporary. Habitat loss is the permanent impacts so severe that all or nearly all species in an area are affected. Degradation can possibly be brought back and loss can not.
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According to research done by Dr. Tyrone Hayes, how does the pesticide atrazine impact individual frogs at various developmental stages and what are the population-level implicaitons?
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Atrazine turns frogs into hermaphrodites postmetamorphasis.
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What are two ways to assess where a population is with respect to K?
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Helicopter surveys for fawn:doe ratio and body condition and fetal rates.
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With a large ungulate population in mind, compare and contrast natural predation and human hunting.
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Predators take the older and weaker. Hunting usually harvest the largest and strongest fo the population, usually large males.
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