4.5 Factors Controlling Population Size S. Preston 1 A2 Unit BY4
... Be able to interpret graphs of changes in population growth rate. Weather, predation, parasitism (disease), food supply, living space and competition may affect population growth. The effect of density dependent factors varies with the size of the population whereas the effect of density independent ...
... Be able to interpret graphs of changes in population growth rate. Weather, predation, parasitism (disease), food supply, living space and competition may affect population growth. The effect of density dependent factors varies with the size of the population whereas the effect of density independent ...
Overall Growth Rate
... Example 1 Varying Growth Rate The average annual growth rate for world population since 1650 has been about 0.7%. However, the annual rate has varied significantly. It peaked at about 2.1% during the 1960’s and is currently (as of 2009) about 1.2%. Find the approximate doubling time for each of thes ...
... Example 1 Varying Growth Rate The average annual growth rate for world population since 1650 has been about 0.7%. However, the annual rate has varied significantly. It peaked at about 2.1% during the 1960’s and is currently (as of 2009) about 1.2%. Find the approximate doubling time for each of thes ...
Week 5 Lecture - Environmental Studies Program
... N = population size (number of individuals) dN = change in population size dt = change in time dN/dt = rate in change of population size r = growth constant; maximum rate of population increase K = carrying capacity; maximum population size ...
... N = population size (number of individuals) dN = change in population size dt = change in time dN/dt = rate in change of population size r = growth constant; maximum rate of population increase K = carrying capacity; maximum population size ...
Mutualism or cooperation among competitors promotes coexistence
... In the Lotka-Volterra competition model and similar competition models, species can only coexist if between-species competition is weaker than within species. Prior modeling and field studies have shown that coexistence can be promoted by reducing the competitive ability between species through spat ...
... In the Lotka-Volterra competition model and similar competition models, species can only coexist if between-species competition is weaker than within species. Prior modeling and field studies have shown that coexistence can be promoted by reducing the competitive ability between species through spat ...
Population Dynamics
... animal species are grouped in herds; plant species sometimes grow around specific features like ponds or lakes • (b) Uniform dispersion – certain animal species are territorial; some plant species produce a same species toxin that limits reproduction or settlement within a given range ...
... animal species are grouped in herds; plant species sometimes grow around specific features like ponds or lakes • (b) Uniform dispersion – certain animal species are territorial; some plant species produce a same species toxin that limits reproduction or settlement within a given range ...
V) Maintenance of species diversity
... iii) Very cool example: Wayne Sousa 1979, Ecology a) System: macroalgae in intertidal boulder field at ...
... iii) Very cool example: Wayne Sousa 1979, Ecology a) System: macroalgae in intertidal boulder field at ...
Qualitative stability and digraphs in model ecosystems
... immediate changes away from equilibrium. The manipulated species itself, if initially increased, may begin to decline because of self-reg~tlation. Converbel!,, if a self-regulating manipulated qpecies is first reduced, i t will then initiall!, increase toward c q u i l i h r i ~ ~ mThese ...
... immediate changes away from equilibrium. The manipulated species itself, if initially increased, may begin to decline because of self-reg~tlation. Converbel!,, if a self-regulating manipulated qpecies is first reduced, i t will then initiall!, increase toward c q u i l i h r i ~ ~ mThese ...
APES POPULATION PATTERNS
... The Change in Population Allele Frequencies Allele frequency refers to the proportion of a population that has a particular allele. Natural selection alters the proportions of alleles, making those that give an advantage to a population higher. Natural selection puts genetic pressure on the populat ...
... The Change in Population Allele Frequencies Allele frequency refers to the proportion of a population that has a particular allele. Natural selection alters the proportions of alleles, making those that give an advantage to a population higher. Natural selection puts genetic pressure on the populat ...
High School Science Essential Curriculum - Environmental
... Define the term "biomass" and its relationship to a food pyramid. e. Describe the major types of interactions between species (e.g., competition, predation, symbiotic relationships). ...
... Define the term "biomass" and its relationship to a food pyramid. e. Describe the major types of interactions between species (e.g., competition, predation, symbiotic relationships). ...
Answers to Mastering Concepts Questions
... period (G) is directly related to the size of the population. As the population grows, G increases. On the other hand, G decreases as a population approaches its carrying capacity because of increasing environmental resistance. As N increases, (K–N)/K approaches zero, and therefore G also approaches ...
... period (G) is directly related to the size of the population. As the population grows, G increases. On the other hand, G decreases as a population approaches its carrying capacity because of increasing environmental resistance. As N increases, (K–N)/K approaches zero, and therefore G also approaches ...
The inflationary effects of environmental fluctuations in
... both equal zero (25). If I ⫽ 0, model 1 implies N(T) ⫽ N(0)exp(具 f 典T), where 具 f 典 is the average rate of population growth over T. If 具 f 典 is negative as T gets large (as is true by definition in a sink habitat with I ⫽ 0), N asymptotically approaches 0. In a constant environment with I ⬎ 0 and f ...
... both equal zero (25). If I ⫽ 0, model 1 implies N(T) ⫽ N(0)exp(具 f 典T), where 具 f 典 is the average rate of population growth over T. If 具 f 典 is negative as T gets large (as is true by definition in a sink habitat with I ⫽ 0), N asymptotically approaches 0. In a constant environment with I ⬎ 0 and f ...
Monitoring the Endangered Species Act: Revisiting the
... declining populations must be taken into account before the threat is actually impacting the target species. Threats to delisted species are not specifically addressed in regulation and since few of the species removed from the ESA actually occur in areas within U.S. jurisdiction it is often difficu ...
... declining populations must be taken into account before the threat is actually impacting the target species. Threats to delisted species are not specifically addressed in regulation and since few of the species removed from the ESA actually occur in areas within U.S. jurisdiction it is often difficu ...
12.2 - Demography
... Fecundity – is the potential for a species to produce offspring in a lifetime. Generation Time - is the average time between the birth of an organism and the birth of the offspring. Sex Ratio – is the relative proportion of males and females in a population. Fecundity is the potential reproductive c ...
... Fecundity – is the potential for a species to produce offspring in a lifetime. Generation Time - is the average time between the birth of an organism and the birth of the offspring. Sex Ratio – is the relative proportion of males and females in a population. Fecundity is the potential reproductive c ...
Mutualism or cooperation among competitors promotes coexistence
... In the Lotka-Volterra competition model and similar competition models, species can only coexist if between-species competition is weaker than within species. Prior modeling and field studies have shown that coexistence can be promoted by reducing the competitive ability between species through spat ...
... In the Lotka-Volterra competition model and similar competition models, species can only coexist if between-species competition is weaker than within species. Prior modeling and field studies have shown that coexistence can be promoted by reducing the competitive ability between species through spat ...
Practice Test One Key
... Slope = rise / run = (100 – 400 Daphnia / m3) / (30 – 0 days) = -10 Daphnia / m3 / day Average population growth rate = -10 Daphnia / m3 / day 2. What is the growth rate at points A and B (using tangent method)? To calculate the growth rate at each point, draw a line tangent to the curve at each poi ...
... Slope = rise / run = (100 – 400 Daphnia / m3) / (30 – 0 days) = -10 Daphnia / m3 / day Average population growth rate = -10 Daphnia / m3 / day 2. What is the growth rate at points A and B (using tangent method)? To calculate the growth rate at each point, draw a line tangent to the curve at each poi ...
Mutualism Commensalism
... explain the specific benefit received by one of the organisms involved in this relationship. ...
... explain the specific benefit received by one of the organisms involved in this relationship. ...
Unit 4
... Carrying capacity – the population of a species that can be supported in a specific area without depleting the available resources. Overshoot – when a population exceeds the carrying capacity of the environment and deaths result from a scarcity of resources. Population crash – a rapid dieback in the ...
... Carrying capacity – the population of a species that can be supported in a specific area without depleting the available resources. Overshoot – when a population exceeds the carrying capacity of the environment and deaths result from a scarcity of resources. Population crash – a rapid dieback in the ...
Ecosystems - West Ashley High School
... physically larger and are able to utilize a fraction of the energy that was produced at the level beneath them, so they have to forage over increasingly large areas to meet their caloric needs. ...
... physically larger and are able to utilize a fraction of the energy that was produced at the level beneath them, so they have to forage over increasingly large areas to meet their caloric needs. ...
Preview Sample 3
... environment for their cells. Characteristics of the physical environment determine the amount of energy necessary to maintain homeostasis. 2. In ecological terms, a population is a group of the same species that occupies a specific area. Factors that affect reproduction and mortality rate, such as s ...
... environment for their cells. Characteristics of the physical environment determine the amount of energy necessary to maintain homeostasis. 2. In ecological terms, a population is a group of the same species that occupies a specific area. Factors that affect reproduction and mortality rate, such as s ...
Community Ecology Notes
... amphibian sp. are extinct, endangered, or vulnerable) • Eggs have no protective shells to block out UV rays • Adults take in water and air through skin, also absorbing pollutants ...
... amphibian sp. are extinct, endangered, or vulnerable) • Eggs have no protective shells to block out UV rays • Adults take in water and air through skin, also absorbing pollutants ...
The paradox of enrichment in phytoplankton by induced competitive
... species are increasing with the increase in nutrient level. As a consequence, we expect an increase in the possibility of coexistence because of more nutrients for all species1. However, we also expect that the increase in nutrients leads to a more competitive ecosystem between species. According to ...
... species are increasing with the increase in nutrient level. As a consequence, we expect an increase in the possibility of coexistence because of more nutrients for all species1. However, we also expect that the increase in nutrients leads to a more competitive ecosystem between species. According to ...
Species–area curves and the geometry of nature
... with two important gradients (ranging from 0 to 100). I arbitrarily defined three spatial scales: a fine scale consisting of the individual cell, an intermediate scale consisting of a 10 10 cell block, and a broad scale consisting of the entire landscape. For both landscapes, gradient 1 was comple ...
... with two important gradients (ranging from 0 to 100). I arbitrarily defined three spatial scales: a fine scale consisting of the individual cell, an intermediate scale consisting of a 10 10 cell block, and a broad scale consisting of the entire landscape. For both landscapes, gradient 1 was comple ...
S i Section 4
... Logistic growth – pattern where growth slows down as it approaches K Model fits some populations but not others ...
... Logistic growth – pattern where growth slows down as it approaches K Model fits some populations but not others ...
