Concept explainers
Density-dependent factors regulate population growth (pp. 1200-1205)
• ln. density-dependent population regulation, death rates rise a net birth rates fall with increasing density. A birth or death rate that does not vary with density is said to be density independent.
• Density-dependent changes in birth and death rates curb population increase through negative feedback and can eventually stabilize a population near its
• Because changing environmental conditions periodically disrupt them, all populations exhibit some size fluctuations. Many populations undergo regular boom-and-bust cycles that are influenced by complex interactions between biotic and abiotic factors. A metapopulation is a group of populations linked by immigration and emigration.
Give an example of one biotic and one abiotic factor that contribute
to yearly fluctuations in the size of the human population.
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EBK CAMPBELL BIOLOGY
- Match each term with its most suitable description. _____ carrying capacity a. maximum rate or increase per individual under ideal conditions _____ exponential growth b. population growth plots out as an S-shaped curve _____ biotic potential c. maximum number or individuals sustainable by the resources in a given environment _____ limiting factor d. population growth plots out as a J-shaped curve _____ logistic growth e. essential resource that restricts population growth when scarcearrow_forwardWhat defines the carrying capacity of a population? Choose All That Apply the maximum number of individuals a particular habitat can support O an indicator of the functional requirements that individuals in a population need for growth and reproduction a reflection of the environmental resources that are needed to support a populationarrow_forwardBased on the equation for logistic population growth, Logistic Growth O A. new Individuals are added most rapidly at low population sizes. This figure displays the equation for logistic population growth and visualizes population growth as a function of time (number of generations) as it approaches carrying capacity. N stands for population size, K stands for carying capacity, and r stands for intrinsic rate of increase. O B. population growth never exceeds K. C. growth rate decreases as N approaches K. D. the population keeps growing when N equals K. K= carrying capacity dN (K-N) dt Number of generations ered MacBook Air F10 F11 吕口 F3 888 F4 F5 F1 F2 $ % & * @ 7 9 2 4 Y P Q W E R F G H K A S D C V N M Z .. * CO B #3 Population size (M)arrow_forward
- A population is expected to grow exponentially after a severe population bottleneck. when the population size is exceeding the carrying capacity of the environment. when the population size is close but below the carrying capacity of the environment. when the birth rate changes as a function of the populationarrow_forwardDefine concept of Limiting Populations and Carrying Capacity ?arrow_forwardDiscuss the scale and consequences of population growthand resource consumptionarrow_forward
- Calcuate the lx(Survivorship which is equal to proportion of population surviving from birth) and survivorship per 1000 individuals S1000= lx*1000. Calculate Fecundity bxarrow_forwardPopulation growth is exponential for the human population. It is an example of a positive feedback cycle where with each child born, the potential number of parents increases in the future. What is the most logical conclusion as to when the human population will reach its carrying capacity? A. When a regulating factor exists that keeps the population at equilibrium B. When feedback mechanisms kick in and population growth declines below carrying capacity C. When equilibirum is reached D. When density-dependent factors come into play and population levels start to decline ❌arrow_forwardA population bottleneck will typically result in; A larger, more diverse population A smaller, less diverse population A larger, less diverse population A smaller, more diverse populationarrow_forward
- Both intraspecific and interspecific competition affect population growth. Which of the following statements about how population growth is affected by competition is correct? Only intraspecific competition increases population growth. Only interspecific competition increases population growth. Both types of competition increase population growth. Both types of competition limit population growth.arrow_forwardConsider the graph. What is the carrying capacity (K) of the population? 700 600 500 400 300 200 100 20 40 60 80 100 Time (weeks) 500 animals 610 animals O 450 animals O Not yet at K O 200 animals Number Animalsarrow_forwardHow can population pass through changes in age structure without changing in size?arrow_forward
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