What Is Chemosynthetic Theory? The earth at this time didn't comprise of any biotic or abiotic features, but was a huge mass containing dissimilar proportions of methane, ammonia, hydrogen gas and water vapor.
Thus, the equation relates the growth rate of the population N to the current population size, incorporating the effect of the two constant parameters r and K. Note that decrease is negative growth. In unstable or unpredictable environments, r-selection predominates due to the ability to reproduce quickly.
There is little advantage in adaptations that permit successful Chemosynthesis theory with other organisms, because the environment is likely to change again. Among the traits that are thought to characterize r-selection are high fecunditysmall body sizeearly maturity onset, short generation time, and the ability to disperse offspring widely.
Organisms whose life history is subject to r-selection are often referred to as r-strategists or r-selected. Organisms that exhibit r-selected traits can range from bacteria and diatomsto insects and grassesto various semelparous cephalopods and small mammalsparticularly rodents. K-selection[ edit ] By contrast, K-selected species display traits associated with living at densities close to carrying capacity and typically are strong competitors in such crowded niches that invest more heavily in fewer offspring, each of which has a relatively high probability of surviving to adulthood i.
In scientific literaturer-selected species are occasionally referred to as "opportunistic" whereas K-selected species are described as "equilibrium".
Traits that are thought to be characteristic of K-selection include large body size, long life expectancyand the production of fewer offspring, which often require extensive parental care until they mature. Organisms whose life history is subject to K-selection are often referred to as K-strategists or K-selected.
Continuous spectrum[ edit ] Although some organisms are identified as primarily r- or K-strategists, the majority of organisms do not follow this pattern. For instance, trees have traits such as longevity and strong competitiveness that characterise them as K-strategists.
In reproduction, however, trees typically produce thousands of offspring and disperse them widely, traits characteristic of r-strategists. Because of their higher reproductive rates and ecological opportunism, primary colonisers typically are r-strategists and they are followed by a succession of increasingly competitive flora and fauna.
The ability of an environment to increase energetic content, through photosynthetic capture of solar energy, increases with the increase in complex biodiversity as r species proliferate to reach a peak possible with K strategies.
Traditionally, biodiversity was considered maximized at this stage, with introductions of new species resulting in the replacement and local extinction of endemic species. Stearns drew attention to gaps in the theory, and to ambiguities in the interpretation of empirical data for testing it.
Holling and Lance Gunderson have revived interest in the theory, and use it as a way of integrating social systems, economics and ecology. This paradigm was challenged as it became clear that other factors, such as age-specific mortality, could provide a more mechanistic causative link between an environment and an optimal life history Wilbur et al.
The r- and K-selection paradigm was replaced by new paradigm that focused on age-specific mortality Stearns, ;  Charlesworth, .
This new life-history paradigm has matured into one that uses age-structured models as a framework to incorporate many of the themes important to the r—K paradigm.Hey fiends, Check back here daily when we hit the road for the official Creature Feature tour blog.
We’ll be posting updates from our shows, lives photos, tour videos, and all the other strange things we come across as we possess the world one concert at a time. In biochemistry, chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight, as in photosynthesis.
Chemoautotrophs, organisms that obtain carbon through. Hey fiends, Check back here daily when we hit the road for the official Creature Feature tour blog.
We’ll be posting updates from our shows, lives photos, tour videos, and all the other strange things we come across as we possess the world one concert at a time.
In biochemistry, chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (e.g., hydrogen gas, hydrogen sulfide) or methane as a source of energy, rather than sunlight, as in photosynthesis.
Chemoautotrophs, organisms that obtain carbon through. The process of chemosynthesis can be divided into 6 significant segments which lead to the origin of the first living cell. The theory states that life developed from non living materials, which incorporated the process of natural selection that had occurred million years ago.
This intended that cells were able to divide, multiply and metabolize. chemosynthesis [kē′mō-sĭn ′ thĭ-sĭs] The formation of organic compounds using the energy released from chemical reactions instead of the energy of sunlight.