Succession and Natural Selection Checkpoint

Succession and Natural Selection Checkpoint - I feel that...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Succession and Natural Selection Primary succession is the change in species composition over time in a previously uninhabited environment. No soil exists when primary succession begins. Secondary succession is the change in species composition that takes place after some disturbance destroys the existing vegetation; soil is already present. The succession of the ecosystem in the Succession animation is secondary. The disturbance was the process of the beavers that dam a creek to create a pond so that they can build a lodge. Just to note there is soil already present in this animation. Although most salamanders have four legs, the aquatic salamander shown below resembles an eel. It lacks hind limbs and has very tiny forelimbs. Propose a hypothesis to explain how limbless salamanders evolved according to Darwin's theory of natural selection.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: I feel that adaptation is the cause of salamanders being limbless. Adaptation is an evolutionary modification that improves a species chance of survival and reproductive success in a given environment. Since the environment changes, the salamanders have to adapt according to their environment. Eventually the accumulation of adaptive modifications might result in a new species. We have to also think of evolution which occurs through the process of natural selection. Natural selection is when successful traits are passed on from generation to generation and traits that are not successful are not passed on. It also consists of four premises, overproduction, variation, limits on population growth, and differential reproductive success. In this case the limbs may not have been a successful trait for the salamanders....
View Full Document

This note was uploaded on 07/30/2010 for the course PSY 220 taught by Professor Lind during the Fall '10 term at University of Phoenix.

Ask a homework question - tutors are online