Population dynamic theory of size
... 1) contains a range of interesting implications of cannibalism for population dynamics. However, a comprehensive overview of the emerged ecological theory is lacking. Our aim is to identify the potential ecological consequences of cannibalism and to relate them to four defining aspects of cannibalis ...
... 1) contains a range of interesting implications of cannibalism for population dynamics. However, a comprehensive overview of the emerged ecological theory is lacking. Our aim is to identify the potential ecological consequences of cannibalism and to relate them to four defining aspects of cannibalis ...
practice populations test (with answers)
... 77. Explain the concept of "resource partitioning," and explain how it may increase the chance of species success. 78. Prey species often develop passive defense mechanisms that reduce the chance of them being eaten. List three types of passive defence mechanisms. 79. Define the term "commensalism" ...
... 77. Explain the concept of "resource partitioning," and explain how it may increase the chance of species success. 78. Prey species often develop passive defense mechanisms that reduce the chance of them being eaten. List three types of passive defence mechanisms. 79. Define the term "commensalism" ...
Problem: American Elk - The International Mathematical Modeling
... Prior to the arrival of European colonization on the North American continent, the ecological biodiversity was much richer than we currently know in the 21st Century. Prior to the colonization animals such as the American Bison (Bison bison), Eastern Elk (Cervus canadensis canadiensis), Eastern Coug ...
... Prior to the arrival of European colonization on the North American continent, the ecological biodiversity was much richer than we currently know in the 21st Century. Prior to the colonization animals such as the American Bison (Bison bison), Eastern Elk (Cervus canadensis canadiensis), Eastern Coug ...
Unit 30D Population and Community Dynamics
... Populations are the functioning units of individual species. Individuals within a population vary due to their genetic diversity and the demands of their environment, and interact with each other in many ways. Many populations together make up an ecological community, in which each population intera ...
... Populations are the functioning units of individual species. Individuals within a population vary due to their genetic diversity and the demands of their environment, and interact with each other in many ways. Many populations together make up an ecological community, in which each population intera ...
carrying capacity: a critique of the concept al~ its usefulness
... simple abstraction: the ability of an area or ecosystem to absorb stress without disruption of its basic properties". Budd (1992) also gives a general definition as "the number of individuals that can be supported in a given area". However, these simple definitions are open to a variety of interpret ...
... simple abstraction: the ability of an area or ecosystem to absorb stress without disruption of its basic properties". Budd (1992) also gives a general definition as "the number of individuals that can be supported in a given area". However, these simple definitions are open to a variety of interpret ...
Do delayed effects of overgrazing explain population cycles in voles?
... et al. 1983, Seldal et al. 1994). Furthermore, Freeland (1974) and Plesner Jensen and Doncaster (1999) have suggested that increased amounts of plants with higher concentration of toxins are inevitably ingested at high population densities of rodents because of a concurrent decrease in the preferre ...
... et al. 1983, Seldal et al. 1994). Furthermore, Freeland (1974) and Plesner Jensen and Doncaster (1999) have suggested that increased amounts of plants with higher concentration of toxins are inevitably ingested at high population densities of rodents because of a concurrent decrease in the preferre ...
From arctic lemmings to adaptive dynamics
... climatic variation. To support this conclusion, he examined long-term population data then available. Despite his firm belief in a climatic cause of the self-repeating periodic dynamics which many species display, Elton was insightful and far-sighted enough to outline many of the other hypotheses si ...
... climatic variation. To support this conclusion, he examined long-term population data then available. Despite his firm belief in a climatic cause of the self-repeating periodic dynamics which many species display, Elton was insightful and far-sighted enough to outline many of the other hypotheses si ...
Hixon, M. A., P. W. Pacala, and S. A. Sandin. 2002. Population
... Abstract. By definition, a population is regulated if it persists for many generations with fluctuations bounded above zero with high probability. Regulation thus requires density-dependent negative feedback whereby the population has a propensity to increase when small and decrease when large. Ulti ...
... Abstract. By definition, a population is regulated if it persists for many generations with fluctuations bounded above zero with high probability. Regulation thus requires density-dependent negative feedback whereby the population has a propensity to increase when small and decrease when large. Ulti ...
The influence of top-down, bottom-up and abiotic factors on the moose
... set of models being considered. By definition, the best model has a !AICC of zero, and models with !AICC " 2 are generally considered worthy of consideration. For all models, the response variable was log-transformed growth rate of moose (rt). That is, rt = mt#1 $ mt , where mt is the natural logari ...
... set of models being considered. By definition, the best model has a !AICC of zero, and models with !AICC " 2 are generally considered worthy of consideration. For all models, the response variable was log-transformed growth rate of moose (rt). That is, rt = mt#1 $ mt , where mt is the natural logari ...
Populations - Lyndhurst School
... Use Figure 5–3 to help students visualize the factors that affect population growth. Ask What two factors add individuals to the fish population? (births and immigration) Ask What two factors remove individuals from the fish population? (deaths and emigration) Ask If the fish population stays the sa ...
... Use Figure 5–3 to help students visualize the factors that affect population growth. Ask What two factors add individuals to the fish population? (births and immigration) Ask What two factors remove individuals from the fish population? (deaths and emigration) Ask If the fish population stays the sa ...
Populations - Lyndhurst School
... Use Figure 5–3 to help students visualize the factors that affect population growth. Ask What two factors add individuals to the fish population? (births and immigration) Ask What two factors remove individuals from the fish population? (deaths and emigration) Ask If the fish population stays the same ...
... Use Figure 5–3 to help students visualize the factors that affect population growth. Ask What two factors add individuals to the fish population? (births and immigration) Ask What two factors remove individuals from the fish population? (deaths and emigration) Ask If the fish population stays the same ...
Population Growth and Interactions
... wild grasses and sedges means plenty of food for bison (Bison bison) and other herbivores. The warm weather and just the right amount of rain have created ideal growing conditions for flies and mosquitoes. These biting insects have short life cycles, so their populations grow rapidly. The bison have ...
... wild grasses and sedges means plenty of food for bison (Bison bison) and other herbivores. The warm weather and just the right amount of rain have created ideal growing conditions for flies and mosquitoes. These biting insects have short life cycles, so their populations grow rapidly. The bison have ...
Interactions of Life Practice Test 2011 Answer Section
... ____ 25. Which of the following is not part of an organism’s niche? a. how it digests food c. how it finds a mate b. how it avoids danger d. how it obtains shelter ____ 26. Which of the following conditions tends to increase the size of a population? a. births exceed deaths c. movements out of an ar ...
... ____ 25. Which of the following is not part of an organism’s niche? a. how it digests food c. how it finds a mate b. how it avoids danger d. how it obtains shelter ____ 26. Which of the following conditions tends to increase the size of a population? a. births exceed deaths c. movements out of an ar ...
Density dependence in ungulates: a review of causes, and concepts
... relation to the ecological carrying capacity (K) of the environment—a topic we will return to later. A characteristic growth curve of numbers over time for these large mammals in a constant environment would be S-shaped, reaching an asymptote at K. Small animals are more likely to be affected by den ...
... relation to the ecological carrying capacity (K) of the environment—a topic we will return to later. A characteristic growth curve of numbers over time for these large mammals in a constant environment would be S-shaped, reaching an asymptote at K. Small animals are more likely to be affected by den ...
continued - Linn-Benton Community College
... as a result of environmental resistance – This growth pattern, where populations increase to the maximum number sustainable by their environment and then stabilize, is called logistic population growth – The maximum population size that can be sustained by an ecosystem for an extended time without d ...
... as a result of environmental resistance – This growth pattern, where populations increase to the maximum number sustainable by their environment and then stabilize, is called logistic population growth – The maximum population size that can be sustained by an ecosystem for an extended time without d ...
The niche construction paradigm in ecological time
... A recent literature in evolutionary theory emphasizes the idea of niche construction (Olden-Smee et al., 2004; Lewontin, 2001; Silver and Di Paolo, 2006; Kerr et al., 1999), in which the convention of a distinct separation between organism and its environment is challenged. Rather, it is argued, the ...
... A recent literature in evolutionary theory emphasizes the idea of niche construction (Olden-Smee et al., 2004; Lewontin, 2001; Silver and Di Paolo, 2006; Kerr et al., 1999), in which the convention of a distinct separation between organism and its environment is challenged. Rather, it is argued, the ...
Population growth rate and its determinants
... The pivotal importance of population growth rate has been recognized for a long time. The historical background has been described by Cole (1958) and Hutchinson (1978), on which some of the following outline is based. The idea of geometric population growth restrained at higher densities by the carr ...
... The pivotal importance of population growth rate has been recognized for a long time. The historical background has been described by Cole (1958) and Hutchinson (1978), on which some of the following outline is based. The idea of geometric population growth restrained at higher densities by the carr ...
Lesson Overview
... Controlling Introduced Species In hydrilla’s natural environment, density-dependent population limiting factors keep it under control. Perhaps plant-eating insects or fishes devour it, or perhaps pests or diseases weaken it. Those limiting factors are not found in the United States, and the result i ...
... Controlling Introduced Species In hydrilla’s natural environment, density-dependent population limiting factors keep it under control. Perhaps plant-eating insects or fishes devour it, or perhaps pests or diseases weaken it. Those limiting factors are not found in the United States, and the result i ...
Unit 10
... Would you support a law forbidding you to marry until a certain age? Do you know how such a law would affect population growth? Would you limit the size of all families to one child ( Figure 16.1)? Do you believe families should welcome as many children as possible? Should these decisions be regulat ...
... Would you support a law forbidding you to marry until a certain age? Do you know how such a law would affect population growth? Would you limit the size of all families to one child ( Figure 16.1)? Do you believe families should welcome as many children as possible? Should these decisions be regulat ...
grade 12 life sciences learner notes
... Seed banks maintain biodiversity and are very similar to gene banks or money banks. Seeds are stored in cool, dry and sterile conditions and kept at –10 to –20 ºC, which may cause damage to the DNA in some plant species. Seeds of most species remain viable for more than 100 years in these cond ...
... Seed banks maintain biodiversity and are very similar to gene banks or money banks. Seeds are stored in cool, dry and sterile conditions and kept at –10 to –20 ºC, which may cause damage to the DNA in some plant species. Seeds of most species remain viable for more than 100 years in these cond ...
Ch 26
... must eventually stabilize or crash – Exponential growth can be observed in populations that undergo boom-and-bust cycles, in which periods of rapid population growth are followed by a sudden, massive die-off ...
... must eventually stabilize or crash – Exponential growth can be observed in populations that undergo boom-and-bust cycles, in which periods of rapid population growth are followed by a sudden, massive die-off ...
Recent advances in ecological stoichiometry: insights for population
... in demographic rates can be further complicated by feedback links from consumer population density to food quality (nutrient:C): low food quality may change the density dependence of reproduction from negative to positive, as described earlier (Sommer 1992). Studies of demographic rates in a stoichi ...
... in demographic rates can be further complicated by feedback links from consumer population density to food quality (nutrient:C): low food quality may change the density dependence of reproduction from negative to positive, as described earlier (Sommer 1992). Studies of demographic rates in a stoichi ...
Recent advances in ecological stoichiometry: insights for population
... in demographic rates can be further complicated by feedback links from consumer population density to food quality (nutrient:C): low food quality may change the density dependence of reproduction from negative to positive, as described earlier (Sommer 1992). Studies of demographic rates in a stoichi ...
... in demographic rates can be further complicated by feedback links from consumer population density to food quality (nutrient:C): low food quality may change the density dependence of reproduction from negative to positive, as described earlier (Sommer 1992). Studies of demographic rates in a stoichi ...
Will Small Population Sizes Warn Us of Impending Extinctions?
... endangered (IUCN 2001) and because changes in numbers are the key measure used to quantify population viability in most situations (e.g., Gerber et al. 1999). This focus on population size as a measure of demographic health can be problematic for two reasons: first, equilibrium population size may b ...
... endangered (IUCN 2001) and because changes in numbers are the key measure used to quantify population viability in most situations (e.g., Gerber et al. 1999). This focus on population size as a measure of demographic health can be problematic for two reasons: first, equilibrium population size may b ...
Brown planthopper - College of Agriculture and Natural Resources
... The high rate of the BPH population growth is primarily due to its high fecundity. Suenaga (1963) reported that the number of oocytes per female is about 2,000 on potted rice plants. Kuno (1968) observed 805 to 908 eggs/female in the three generations. On field-grown rice covered with a nylon net, K ...
... The high rate of the BPH population growth is primarily due to its high fecundity. Suenaga (1963) reported that the number of oocytes per female is about 2,000 on potted rice plants. Kuno (1968) observed 805 to 908 eggs/female in the three generations. On field-grown rice covered with a nylon net, K ...