Although biologists have different standards for defining an adaptive radiation, it generally means an
event in which a lineage rapidly diversifies
, with the newly formed lineages evolving different adaptations. The rapid diversification of mammals shown below may constitute an adaptive radiation.
What causes diversification?
There are two main mechanisms for change which will reduce biodiversity within a population:
Genetic drift
: The change in the composition of a gene pool as a result of a random or chance event. Natural selection: The change in the composition of a gene pool as a result of differentially selective environmental …
What causes rapid diversification of species?
Third, it is also possible that
environmental heterogeneity and ecological opportunity
were the major factors driving rapid diversification.
Which clade is most diverse?
One explanation for heterogeneity among clade richness is that
older clades
are more species rich because they have had more time to accrue diversity than younger clades.
Why do some clades have more species than others?
The number of species in a clade is directly controlled by the addition of species through speciation and their subtraction through extinction over time. … Under the clade-age hypothesis, some clades have
higher richness because they are older
, and therefore have had more time to accumulate species through speciation.
What is meant by diversification?
Diversification is
a risk management strategy that mixes a wide variety of investments within a portfolio
. … The rationale behind this technique is that a portfolio constructed of different kinds of assets will, on average, yield higher long-term returns and lower the risk of any individual holding or security.
Is genetic drift evolution?
Genetic drift is
a mechanism of evolution
. It refers to random fluctuations in the frequencies of alleles from generation to generation due to chance events. Genetic drift can cause traits to be dominant or disappear from a population. The effects of genetic drift are most pronounced in small populations.
Is diversification good or bad?
Diversification can
lead into poor performance
, more risk and higher investment fees! … To avoid losing our financial nest egg in a disastrous event from a single investment (i.e., bankruptcy), we spread our money around into different stocks, bonds, commodities and real estate holdings.
Is diversification a good strategy?
Diversification can
help an investor manage risk and reduce the volatility of an asset’s price movements
. … You can reduce the risk associated with individual stocks, but general market risks affect nearly every stock and so it is also important to diversify among different asset classes.
What are the advantages of diversification?
Three key advantages of diversification include:
Minimising risk of loss
– if one investment performs poorly over a certain period, other investments may perform better over that same period, reducing the potential losses of your investment portfolio from concentrating all your capital under one type of investment.
Are birds the most diverse?
With more than 10,000 species alive today, birds constitute
the most diverse group of land vertebrates
(backboned animals) on Earth.
What is the most diverse vertebrate?
Teleost fishes
are the largest and most diverse group of vertebrates. The diversity of teleosts has been attributed to a whole-genome duplication (WGD) event in the ray-finned fish lineage.
Why do scientists apply the concept of maximum parsimony?
Why do scientists apply the concept of maximum parsimony? …
Maximum parsimony hypothesizes that events occurred in the simplest
, most obvious way, and the pathway of evolution probably includes the fewest major events that coincide with the evidence at hand.
What is an example of diversification?
For example,
an auto company may diversify by adding a new car model
or by expanding into a related market like trucks. … If a company is expanding into industries that are unrelated to its current business, then it’s engaging in conglomerate diversification.
What are the types of diversification?
- Horizontal diversification.
- Vertical diversification.
- Concentric diversification.
- Conglomerate diversification.
- Defensive diversification.
- Offensive diversification.
What is the principle of diversification?
That
portfolios of different sorts of assets differently correlated with one another will have negligible unsystematic risk
. In other words, unsystematic risks disappear in diversified portfolios, and only systematic risks persist, those related to particular assets.
