Biology 1001A Lecture Notes - Paramecium, Ecological Niche, Interspecific Competition

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azurehornet978

18 Oct 2012

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Most k-selected species show logistic growth what about us: k-selected species grow in a logistic pattern of growth i. e. exponential growth, humans can modify their environment for suitable growth, no competitors, to compete for resources. Ans: increased carry capacity, k; decrease death rate due to improvement in medicine; increased birth rates. Population will generally increase by 2025: due to higher birth rates, lower death rates r reflects age structure (mexico) large base range, big younger population. Globally, r=0. 012 or 1. 2% (per person per year: all-time high was 2. 2% in the 1960"s. Over time, human societies get wealthier : pre-industrial era, r was relatively low, transitional era, decrease in death rate (d). Industrial era, death rates decrease, birth rates decrease, r decreases: postindustrial era, (i. e. europe), birth rates reach to zero, death rates decrease/ level off. r decreases. Community has multiple species: population includes only one specie. Some species limited by a single critical factor.

Related Questions

In a small population, if immigration is greater than emigrationand if the birth rate is higher then the death rate then

Select one:

a. the death rate will likely decrease and the birth rate willlikely increase.

b. the population will experience exponential growth.

c. if nothing changes then the population will eventually reachor exceed the carrying capacity of the environment.

d. the population has plenty of resources.

e. the number of predators will also increase.

mauvecattle119

Question :Mutations that cause sickness and/or death after reproduction has occurred:

Question 1

options: can be passed on to future generations.

will not be passed on to future generations. are unlikely to occur.

are only passed on to future generations in species that have short life spans.

Question 2

In a population exhibiting logistic growth, what happens when the carrying capacity is exceeded?

Question 2 options:

The growth rate becomes zero until the population is back within the carrying capacity.

The growth rate becomes negative until the population is back within the carrying capacity.

The population crashes and becomes extinct.

The population's fertility drops to zero.

Question 3 How does exponential growth differ from logistic growth?

Question 3 options:

Logistic growth models take the population's age structure into account.

Long-term exponential growth is more commonly observed than long-term logistic growth in nature.

The logistic model of growth incorporates environmental limitations on population size.

Logistic growth generally comes with infinite expansion.

Question 4 Density-dependent and density-independent growth factors influence the size of a population by causing changes in the:

Question 4 options:

death rate and pattern of dispersion.

birth rate and death rate.

age structure and birth rate.

carrying capacity and age structure.

Question 5 The life history of an organism does not include the organism's

Question 5 options:

reproduction

All of these are included in an organism's life history.

death

birth

Visit the websites titled, âExponential Growthâ(http://www.otherwise.com/population/exponent.html)and âLogistic Growthâ. (http://www.otherwise.com/population/logistic.html) Run theapplet (for both websites) at birth rates of 1.2, 1.5 and 2. Makesure to view the graph results of all growth rates.

Describe the effects of birth rate on the exponential andlogistic growth curves.

Answer in100 words or less.

olivecockroach724

Biology 1001A Lecture Notes - Paramecium, Ecological Niche, Interspecific Competition

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