What are 4 methods that scientists use to determine the size of a population?
Here we compare estimates produced by four different methods for estimating population size i.e. aerial counts hunter observations pellet group counts and cohort analysis.
What are population ecologists primarily interested in?
Population ecologists are primarily interested in understanding how biotic and abiotic factors influence the density distribution size and age structure of different populations.
Which of the following is a characteristic of K selected populations?
K-selected species are characterized by long gestation periods lasting several months slow maturation (and thus extended parental care) and long life spans. In addition they tend to inhabit relatively stable biological communities such as late-successional or climax forests (see ecological succession).
Which is most likely to contribute to density-dependent regulation of populations?
Density-dependent Regulation
Most density-dependent factors are biological in nature and include predation inter- and intraspecific competition and parasites. Usually the denser a population is the greater its mortality rate.
What are the 4 processes that determine population growth?
Population growth rate is affected by birth rates death rates immigration and emigration.
What are the methods of estimating population size?
Ecologists often estimate the size and density of populations using quadrats and the mark-recapture method. A population can also be described in terms of the distribution or dispersion of the individuals that make it up. Individuals may be distributed in a uniform random or clumped pattern.
Which of the following is a measurement of population density?
In the U.S. population density is typically expressed as the number of people per square mile of land area. The U.S. value is calculated by dividing the total U.S. population (316 million in 2013) by the total U.S. land area (3.5 million square miles).
Which concept Would a community ecologist be most likely to study?
Community Ecology looks at the relationships and interactions between different species within a biological community. By studying predation competition and symbiosis in a polar ecosystem in Greenland discover what it really means to be at the top of the food chain in this community as well as your own.
Which of the following would most likely promote random distribution quizlet?
Which of the following would most likely promote random distribution of a population? homogeneous (relatively constant) environmental conditions. You just studied 12 terms!
Which of the following most characterizes K-selected species?
K-selected species are characterized by long gestation periods lasting several months slow maturation (and thus extended parental care) and long life spans. In addition they tend to inhabit relatively stable biological communities such as late-successional or climax forests (see ecological succession).
Which organisms would be most likely to be K-selected?
K-selected species produce offspring that each have a higher probability of survival to maturity. Although not always the case K-selection is more common in larger animals like whales or elephants with longer lifespans and overlapping generations. The young tend to be altricial (immature requiring extensive care).
Which of the following is a K-selected species?
Elephants humans and bison are all k-selected species. On the other hand r-selected species often inhabit unstable environments and are completely density independent. These species often have short life expectancies produce as many offspring as they can and invest very low amounts of parental care.
Which of the following best defines density independent growth regulation?
Which of the following best defines density-independent growth regulation? A population’s size can be affected by these factors that occur with equal severity at all population densities.
Which of the following could be a density dependent factor that might limit population growth quizlet?
Density-Dependent limiting factors include competition predation herbivory parasitism disease and stress from overcrowding. Density Dependent limiting factors operate strongly only when population density- the number of organisms per unit area- reaches a certain level.
What is population dispersion quizlet?
Dispersion. – A property of populations pattern of spacing of individuals within the area the population inhabits. Patterns include clumped uniform and random.
What processes determine population growth?
First population size is influenced by the per capita population growth rate which is the rate at which the population size changes per individual in the population. This growth rate is determined by the birth death emigration and migration rates in the population.
What are the 4 factors that determine population size and how does each affect the population?
Population growth rate is how fast a population changes in size over time. Population growth is determined by rates of birth death immigration and emigration.
What are the 4 factors of population?
Natality mortality immigration and emigration rates apply to every population including the human population. The sum of these rates makes up the growth rate of a population.
Which method of population estimation is the most accurate?
Population research methods. Counting all individuals in a population is the most accurate way to determine its size.
Which method is suitable for small size of population?
A sample survey takes a fraction of the population. Sample surveys are cheaper than censuses but are not as accurate.
How do you find the population of a study?
The population will always be the bigger number of the sample size and population. The population is the whole group of people being studied. In the example the population is the size of the high school being studied so 250 people.
Which is useful for measure population density?
(2) Relative densities- In this method relative density of the population is taken into account rather than counting the total number. For example – The number fish caught per trap gives the measure of their total population density in the given water body.
Which of the following is the most appropriate measure of population density?
Although the total number is generally the most appropriate way of measuring density the indirect count is also used for that purpose. So the correct answer is “Indirect count”. Note: In the case of humans population density refers to the number of people living per square km or square mile.
What two measurements are needed to calculate density?
So to find the density of an object we merely need to measure its mass and then its volume and then divide the mass by the volume.
What is the study of community ecology?
Community ecology is the study of communities formed of populations of different species. It includes the study of the interactions between species such as mutualism predation and competition and the dynamics and structure of the community.
What is a community ecology quizlet?
community ecology – how species interact within a community. … community ecology is the study of how a community as a whole functions and changes over time. define species diversity. species diversity – the number and relative abundance of species in an area.
Which of the following might be studied by an ecosystem ecologist?
Ecologists studying an ecosystem examine the living species (the biotic components) of the ecosystem as well as the nonliving portions (the abiotic components) such as air water and soil of the environment.
Which of the following groups would be most likely to exhibit uniform spatial distribution?
The group that would be most likely to exhibit uniform dispersion is a. red squirrels who actively defend territories.
Which of the following ecological locations has the greatest species diversity?
3. There is more biodiversity within tropical ecosystems than temperate or boreal ecosystems. In fact tropical rain forests have the most diversity.
Which of the following is the most logical conclusion about the distribution of the two species of barnacle Chthamalus and balanus?
Which of the following is the most logical conclusion about the distribution of the two species of barnacle Chthamalus and Balanus? Balanus is less able to resist desiccation than Chthamalus. Which of the following is a good description of an ecological niche?
Which of the following is a typical K-selected species adaptation?
Which of the following is a typical K-selected species’ adaptation? K-selected species have a low biotic potential but high survivorship in part because of extended care for their young. … Prevent the introduction of a non-native species into an area.
Which of the following is the characteristic of K?
Carrying Capacity: The ‘K’ in K-selected populations refers to the carrying capacity. The offspring of a K-selected population are entering a competitive environment where the population is at or near its carrying capacity.
Which adaptation is characteristic of K-selected populations?
Traits that ensure the population doesn’t exceed the carrying capacity are known as K-selected traits. This includes characteristics like slow development low reproductive rate strong competitive ability and good parental care among others.
Which organisms would be most likely to be K-selected quizlet?
Endangered species are likely to be K-selected species because they produce fewer offspring and breed less frequently.
Scales of Measurement – Nominal Ordinal Interval & Ratio Scale Data
Populations samples and measurements (Introduction to Statistics #2)
Robert Waldinger: What makes a good life? Lessons from the longest study on happiness | TED
13 Selection of study population