The vegetation profile of the source population on Iron Cay averaged substantially taller and broader vegetation (
mean vegetation height = 384 cm and mean vegetation diameter
= 11.1 cm) compared to the experimental founder islands, which have much shorter and narrower vegetation (mean vegetation height ranged from 62- …
Are the Iron Cay and experimental island populations different from one another?
The smaller islands, whose lizard populations had been wiped out by a recent hurricane, are very similar to one another, populated by the same types of insects, birds and vegetation (short scrubs), but
very different from Iron Cay
, which is forested.
How is an ecomorph different from species?
how is an ecomorph different from a species? An ecomorph is different from a species because
ecomorphs on different islands may be distantly related with the same morphology
, in a species, all no matter what island they are on, they are all very closely related.
What evidence indicates that the same types of anoles evolved independently on different islands?
In a phylogenetic tree, a node represents a common ancestor.
DNA sequencing data
indicates that lizards on each island tend to be more closely related to each other than to similar species on other islands, indicating that the same types of anoles evolved independently on different islands.
Why did the anole experiment end after a year?
Unfortunately, the experiment ended prematurely in 2004 when
two hurricanes, Frances and Jeanne, swept across the islands, wiping them clean of lizards
. Though researchers were disappointed initially, some lizard eggs did survive and the populations have slowly re-established themselves.
What do the four groups of anoles trunk crown twig trunk-ground and grass bush represent quizlet?
What do the four groups of anoles (trunk-crown, twig, trunk-ground, and grass-bush) represent? The four types of anoles in this virtual lab are called
ecomorphs
. These are groups of lizards that occupy different ecological niches (i.e., “eco”) and have different shapes or morphologies (i.e., “morph”).
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.
What is an example of an Ecomorph?
The groups are referred to as ecological morphotypes, or ecomorphs. For example, the
grass-bush anoles live on grass and small bushes
, and typically have long legs and strikingly long tails that help them balance on thin branches and blades of grass.
What is an Ecomorph and why do they occur?
The ecomorph concept is a term first coined by Ernest Edward Williams in 1972 which he defined as
a “species with the same structural habitat/niche, similar in morphology and behavior, but not necessarily close phyletically
.” Williams first applied this definition to the Greater Antillean anoles (especifically in …
Why do scientists use phylogenetic trees?
Scientists use a tool called a phylogenetic tree
to show the evolutionary pathways and connections among organisms
. A phylogenetic tree is a diagram used to reflect evolutionary relationships among organisms or groups of organisms. … Many scientists build phylogenetic trees to illustrate evolutionary relationships.
Where do anoles come from?
Range and Habitat: The green anole is a common lizard throughout
Georgia and South Carolina
, but is absent from some areas in the mountains. Anoles are generally arboreal (living in trees) but can be found almost anywhere.
Which anole species seems to have a brighter dewlap?
Anolis Cooki
as the brightest dewlap.
What environmental factors are causing the anoles to evolve differently?
A wide variety of research—including behavioral observations, comparisons across study sites and experimental manipulations—indicates that anole species interact strongly and
that interspecific competition for resources
is likely the cause of their adaptive divergence.
How did Dr Losos explain their findings?
How did Dr. Losos explain their findings?
Living on the ground was dangerous even for small lizards, so they found other ways to escape like climbing in bushes and trees
. 13a: There was variation in the trait among individual anoles in the population.
How does the size of a brown anole lizard hatchling affect its chances of survival?
Because of their small size, these anole hatchlings are eaten by many different animals, including birds, crabs, other species of anole lizards, and even adult brown anoles! … Traits that help young brown anoles
avoid predation and reproduce will get passed on to future generations
.
In what environment are longer legs advantageous to the lizard?
If students watched the short film The Origin of Species: Lizards in an Evolutionary Tree, they should know that long legs are advantageous
when living on the ground
, while short legs are better suited for climbing twigs in small trees and bushes.
