Investigating Natural Selection
... concepts of natural selection and evolution will illustrate the importance of Darwin’s theory in today’s society. Activity Summary Students investigate the predator-prey relationship as an example of how natural selection occurs in a population. Relate natural selection to current happenings. Object ...
... concepts of natural selection and evolution will illustrate the importance of Darwin’s theory in today’s society. Activity Summary Students investigate the predator-prey relationship as an example of how natural selection occurs in a population. Relate natural selection to current happenings. Object ...
Facing Extinction: 9 Steps to Save
... global in scope—of exploiting nature and depleting resources. As we have expanded our influence over the world, we have also extinguished species and populations at an alarming rate. Despite attempts to reduce biodiversity loss, the trend is likely to continue: nearly 20% of all humans—more than a b ...
... global in scope—of exploiting nature and depleting resources. As we have expanded our influence over the world, we have also extinguished species and populations at an alarming rate. Despite attempts to reduce biodiversity loss, the trend is likely to continue: nearly 20% of all humans—more than a b ...
Facing Extinction: 9 Steps to Save Biodiversity
... global in scope—of exploiting nature and depleting resources. As we have expanded our influence over the world, we have also extinguished species and populations at an alarming rate. Despite attempts to reduce biodiversity loss, the trend is likely to continue: nearly 20% of all humans—more than a b ...
... global in scope—of exploiting nature and depleting resources. As we have expanded our influence over the world, we have also extinguished species and populations at an alarming rate. Despite attempts to reduce biodiversity loss, the trend is likely to continue: nearly 20% of all humans—more than a b ...
Extending Genomics to Natural Communities and Ecosystems
... bridge for uncovering the molecular determinants of community and ecosystem phenotypes. First, genomic regions controlling traditional phenotypes are identified with QTL analysis and/or genetic association studies. Candidate genes from these intervals are identified from the genome sequence and anch ...
... bridge for uncovering the molecular determinants of community and ecosystem phenotypes. First, genomic regions controlling traditional phenotypes are identified with QTL analysis and/or genetic association studies. Candidate genes from these intervals are identified from the genome sequence and anch ...
Chapter 21
... • As the bee continues to forage, she carries the pollen to the female reproductive organ of the flower – the pistil. • The pistil is topped with a sticky “landing pad” called a stigma. • When a bee lands on the stigma, pollen grains are deposited, and from there travel down a tube-like style into t ...
... • As the bee continues to forage, she carries the pollen to the female reproductive organ of the flower – the pistil. • The pistil is topped with a sticky “landing pad” called a stigma. • When a bee lands on the stigma, pollen grains are deposited, and from there travel down a tube-like style into t ...
Accidental experiments: ecological and evolutionary insights and
... Humans are the dominant ecological and evolutionary force on the planet today, transforming habitats, polluting environments, changing climates, introducing new species, and causing other species to decline in number or go extinct. These worrying anthropogenic impacts, collectively termed global cha ...
... Humans are the dominant ecological and evolutionary force on the planet today, transforming habitats, polluting environments, changing climates, introducing new species, and causing other species to decline in number or go extinct. These worrying anthropogenic impacts, collectively termed global cha ...
Ecological Succession
... – The series of predictable changes that occurs in a community over time – Primary succession occurs on a surface where no soil exists. Example: bare rock, areas covered by volcanic ash – Secondary succession occurs in an area where a disturbances changes an existing community without destroying the ...
... – The series of predictable changes that occurs in a community over time – Primary succession occurs on a surface where no soil exists. Example: bare rock, areas covered by volcanic ash – Secondary succession occurs in an area where a disturbances changes an existing community without destroying the ...
Presentation
... – After a disturbance, new species of plants and animals might occupy the habitat. ...
... – After a disturbance, new species of plants and animals might occupy the habitat. ...
Evolutionarily stable range limits set by interspecific competition
... of interspecific competition is similar to that of intraspecific competition, the species with the higher carrying capacity will exclude the other: a range limit is set across a varying environment, where the ranking of the carrying capacities changes (MacLean & Holt 1979). Purely ecological models ...
... of interspecific competition is similar to that of intraspecific competition, the species with the higher carrying capacity will exclude the other: a range limit is set across a varying environment, where the ranking of the carrying capacities changes (MacLean & Holt 1979). Purely ecological models ...
Evolution powerpoint.
... the two extremes of a trait. For example, plant height might be acted on by stabilizing selection. A plant that is too short may not be able to compete with other plants for sunlight. However, extremely tall plants may be more susceptible to wind damage. Combined, these two selection pressures selec ...
... the two extremes of a trait. For example, plant height might be acted on by stabilizing selection. A plant that is too short may not be able to compete with other plants for sunlight. However, extremely tall plants may be more susceptible to wind damage. Combined, these two selection pressures selec ...
Summary and perspective on evolutionary ecology
... quicker in feeding, bolder and more aggressive than fishes originating from high-predation sites, thus suggesting that population divergence in behaviour is mediated by predation intensity. Divergence in body shape, coupled with assortative mating for body shape, produced strong reproductive isolati ...
... quicker in feeding, bolder and more aggressive than fishes originating from high-predation sites, thus suggesting that population divergence in behaviour is mediated by predation intensity. Divergence in body shape, coupled with assortative mating for body shape, produced strong reproductive isolati ...
Endangered Species Coalition 2015 Top 10 Report Nominating Form
... represents the only population remaining on the San Francisco Peninsula. At least two other populations of tiger salamanders once existed in the Stanford area, most notably one centered in the wetlands formerly located in Portola Valley, near the intersection of Indian Crossing and Alpine roads. Rec ...
... represents the only population remaining on the San Francisco Peninsula. At least two other populations of tiger salamanders once existed in the Stanford area, most notably one centered in the wetlands formerly located in Portola Valley, near the intersection of Indian Crossing and Alpine roads. Rec ...
AP Biology Assignment Sheet for
... 3. I can explain how organisms use free energy to maintain organization, grow and reproduce. a. I can explain how excess acquired energy versus required free energy expenditure results in energy storage or growth. b. I can explain how insufficient acquired free energy versus required free energy exp ...
... 3. I can explain how organisms use free energy to maintain organization, grow and reproduce. a. I can explain how excess acquired energy versus required free energy expenditure results in energy storage or growth. b. I can explain how insufficient acquired free energy versus required free energy exp ...
Community Ecology
... could potentially survive and reproduce ‘potential niche’ • Some species have a broad fundamental niche • Some species have a narrow fundamental niche ...
... could potentially survive and reproduce ‘potential niche’ • Some species have a broad fundamental niche • Some species have a narrow fundamental niche ...
Niches - Teacher Pages
... • A niche includes both biotic and abiotic factors. Some biotic factors that help define a niche are food sources and predators. Abiotic factors include temperature, amount of sunlight and water. • All members of a species are adapted to the same niche. No two species can share the same niche in the ...
... • A niche includes both biotic and abiotic factors. Some biotic factors that help define a niche are food sources and predators. Abiotic factors include temperature, amount of sunlight and water. • All members of a species are adapted to the same niche. No two species can share the same niche in the ...
Ecological fitting
Ecological fitting is ""the process whereby organisms colonize and persist in novel environments, use novel resources or form novel associations with other species as a result of the suites of traits that they carry at the time they encounter the novel condition.” It can be understood as a situation in which a species' interactions with its biotic and abiotic environment seem to indicate a history of coevolution, when in actuality the relevant traits evolved in response to a different set of biotic and abiotic conditions. The simplest form of ecological fitting is resource tracking, in which an organism continues to exploit the same resources, but in a new host or environment. In this framework, the organism occupies a multidimensional operative environment defined by the conditions in which it can persist, similar to the idea of the Hutchinsonian niche. In this case, a species can colonize new environments (e.g. an area with the same temperature and water regime) and/or form new species interactions (e.g. a parasite infecting a new host) which can lead to the misinterpretation of the relationship as coevolution, although the organism has not evolved and is continuing to exploit the same resources it always has. The more strict definition of ecological fitting requires that a species encounter an environment or host outside of its original operative environment and obtain realized fitness based on traits developed in previous environments that are now co-opted for a new purpose. This strict form of ecological fitting can also be expressed either as colonization of new habitat or the formation of new species interactions.