Lecture 1 - Life Histories Flashcards
What are populations? [2]
Populations are groups of individuals of the same species which live and interact in the same geographical area.
What are biotic interactions? [1]
Biotic interactions are interactions with ‘life’.
What are abiotic interactions? [1]
Abiotic interactions are interactions with the environment.
What is a community? [1]
A community is all the individuals of a species that inhabit a particular geographic area.
What is an individual? [1]
An individual life form.
What two types of organisms are there? [2]
Unitary and modular organisms exist.
What is a unitary organism? [1]
The form of unitary organisms are preset, with identifying characteristics as a consequence of determinate growth..
What are modular organism? [2]
Modular organisms have indeterminate growth and a varied developmental structure.
What six factors influence population change? [6]
Immigration Emigration Extinction Colonisation Birth Death
What factors within population change can be used directly to measure population growth? [2]
Births and deaths, as they’re numeric values.
What three traits are key in life history events? [3]
Birth
Sexual maturation
Senesence [death]
What is iteroparity? [1]
Iteroparity refers to repeated reproduction through a lifecycle.
What is semelparity? [1]
Semelparity is a ‘big-bang’ reproduction.
What do annual plant life-cycles provide an example of? [1]
Plants like Lambsquarter are semelparous, they set seed after a year and then die!
What is seasonal iteroparity? [1]
Plants like groundsel are seasonally iteroparous, they reproduce multiple times throughout the year then get killed by a seasonal event (such as frost).
