what three variables form the life history of a species
What Three Variables Form The Life History Of A Species?
The three variables that form the life history of a species are: when reproduction (the age at first reproduction or at maturity), how often the organism reproduces, and how many offspring are produced during each reproductive episode.
What are some factors that explain human population growth since 1650?
The human population has increased explosively since about 1650 C.E. (common era). Most models show growth slowing down in the current century. As with other species, human population growth depends on birth rates and death rates. When birth rates go up and death rates go down, the population increases.
What is the difference between density and dispersion AP Bio?
What is the difference between density and dispersion? Density is the volume of individuals whereas dispersion is the spacing among those individuals within the population.
What do the dispersion patterns tell us about the population and its interaction?
The density of a population is the number of individuals per unit area or volume. Dispersion is the pattern of spacing among individuals within the boundaries of the population. … A uniform pattern of dispersion may result from direct interactions between individuals in the population.
What is the difference between Semelparity and Iteroparity quizlet?
semelparity (big-bang reproduction): reproduce one then die. iteroparity (repeated reproduction): produce offspring repeatedly.
What are three variables that affect life history quizlet?
The three variables that form the life history of a species are: when reproduction (the age at first reproduction or at maturity), how often the organism reproduces, and how many offspring are produced during each reproductive episode.
What are the 3 or 4 most important factors required to sustain a population?
Carrying capacity is defined as the “maximum population size that an environment can sustain indefinitely.” For most species, there are four variables that factor into calculating carrying capacity: food availability, water supply, living space, and environmental conditions.
What are the 3 types of population pyramids?
There are generally three types of population pyramids created from age-sex distributions— expansive, constrictive and stationary.
What are the three common patterns of population dispersion what might cause a population to disperse?
Individuals of a population can be distributed in one of three basic patterns: they can be more or less equally spaced apart (uniform dispersion), dispersed randomly with no predictable pattern (random dispersion), or clustered in groups (clumped dispersion).
How do the three main patterns of population dispersion differ from one another?
How do the three patterns of dispersion differ from one another? the locations of others in a random distribution. A clumped distribution can occur when animals gather into herds or flocks or when resources, such as food or nesting sites, are clumped. individuals in the population from that area.
What are the 3 types of dispersion patterns?
A specific type of organism can establish one of three possible patterns of dispersion in a given area: a random pattern; an aggregated pattern, in which organisms gather in clumps; or a uniform pattern, with a roughly equal spacing of individuals.
What are the 3 types of dispersion?
Dispersion or distribution patterns show the spatial relationship between members of a population within a habitat. Individuals of a population can be distributed in one of three basic patterns: uniform, random, or clumped.
What are the 3 types of population?
There are three types of population pyramids: expansive, constrictive, and stationary. Expansive population pyramids depict populations that have a larger percentage of people in younger age groups. Populations with this shape usually have high fertility rates with lower life expectancies.
What is the life history of an organism based?
The life history of an organism is its pattern of survival and reproduction, along with the traits that directly affect survival and the timing or amount of reproduction. Rates of survival and reproduction can be estimated across age classes, or across different stages in organisms with complex life cycles.
What is the difference between density and dispersion?
Population density refers to the total number of organisms living in a particular environment. … Population dispersion in ecology describes how the population is distributed into different groups in a particular area.
Which species is Semelparous quizlet?
a. An octopus is considered a semelparous species.
Which type of factors has the biggest impact on an organism’s life history quizlet?
The main variables of life history include reproductive age, frequency of reproduction and the number of offspring produced at each reproduction event. Explain how life history impacts demographics and population growth. An increase or decrease in the population may affect the rate of birth and/or death.
What are the three most important factors affecting the rate of population growth?
Population growth rate is affected by birth rates, death rates, immigration, and emigration.
What are some biological characteristics of a species that determines its life history strategy?
Life History Strategy
See also what are the 7 layers of earthLife history traits includes such factors as the number, size and sex ratio of offspring, the timing of reproduction, age and size at maturity and growth pattern, longevity, and so on. All of these are heritable to some degree and thus subject to natural selection.
What are 3 biotic limiting factors?
Biotic or biological limiting factors are things like food, availability of mates, disease, and predators.
What are some variables for carrying capacity in a system?
Carrying capacity, or the maximum number of individuals that an environment can sustain over time without destroying or degrading the environment, is determined by a few key factors: food availability, water, and space.
What are the major types of physical limiting factors to life?
Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources. Others are abiotic, like space, temperature, altitude, and amount of sunlight available in an environment. Limiting factors are usually expressed as a lack of a particular resource.What are the 4 general types of age structure diagrams?
The different age-structure diagrams are represented by different shapes. Four general types are the pyramid, column, an inverted pyramid (top-heavy), and a column with a bulge.
How do geographical features affect the distribution of population?
Population distribution across the Earth is uneven. … Physical factors that affect population density include water supply, climate, relief (shape of the land), vegetation, soils and availability of natural resources and energy. Human factors that affect population density include social, political and economic factors.
What are the 4 stages of population pyramids?
The stages of demographic transition are – (i) high stationary stage; (ii) early expanding stage; (iii) late expanding stage; (iv) low stationary stage and (v) declining or negative growth rate stage. These stages are represented by dramatically different population pyramids (Fig. 4).
What are the three patterns of dispersion and what conclusions?
What are the three patterns of dispersion and what conclusions can you draw from these patterns? The three patterns are clumped, uniform, and random. A clumped pattern of animals could be associated with mating behavior or to increase effectiveness of certain predators.
What are the three common patterns of population distribution quizlet?
The manner in which individuals in a population are spaced within their area. Three types of dispersion patterns are clumped (individuals are aggregated in patches), uniform (individuals are evenly distributed), and random (unpredictable distribution).
What do the three types of survivorship curves represent?
There are three types of survivorship curves. Type I curves depict individuals that have a high probability of surviving to adulthood. Type II curves depict individuals whose chance of survival is independent of age. Type III curves depict individuals that mostly die in the early stages of their life. See also who wrote principles of geology?What are dispersion patterns?
Species distributionSpecies dispersion patterns—or distribution patterns—refer to how the individuals in a population are distributed in space at a given time. The individual organisms that make up a population can be more or less equally spaced, dispersed randomly with no predictable pattern, or clustered in groups.
What is the primary factor in the pattern of dispersion for all organisms?
Populations are distributed through dispersion. Organisms can be dispersed into uniform groups, clumped groups, and even random groups. A primary factor in the pattern of dispersion for all organisms is the availability of resources such as food.
What factors influence the pattern of the population over a space?
The density of organisms varies depending on a variety of factors. Deaths, births, immigration, and emigration are all processes that can impact population density at a given time.
What are the 3 examples of density independent factors?
There are many common density independent factors, such as temperature, natural disasters, and the level of oxygen in the atmosphere. These factors apply to all individuals in a population, regardless of the density.What are three means of dispersal?
Three Kinds of Dispersal Leading to Range ExpansionJump Dispersal. Diffusion. Secular Migration.
What is species dispersal?
Biological dispersal refers to those processes by which a species maintains or expands the distribution of a population. Dispersal implies movement—movement away from an existing population (population expansion) or away from the parent organism (population maintenance).
