Diet–demography relationships in a long
... territorial level. These percentages were then used to estimate diet diversity by means of the Shannon–Wiener index (H’) (Shannon and Weaver 1949). Estimation of demographic parameters We based our estimates of survival and breeding performance on basic monitoring information. To record this informa ...
... territorial level. These percentages were then used to estimate diet diversity by means of the Shannon–Wiener index (H’) (Shannon and Weaver 1949). Estimation of demographic parameters We based our estimates of survival and breeding performance on basic monitoring information. To record this informa ...
Honors Biology notes
... A. definition of population B. measuring populations and their distribution (Fig 36.2) C. population growth depends on birth and death rates 1. exponential growth produces a “J-shaped” curve (fig. 36.4A) 2. growth is eventually limited by resources, producing an “Sshaped” curve (fig. 36.4C) 3. the m ...
... A. definition of population B. measuring populations and their distribution (Fig 36.2) C. population growth depends on birth and death rates 1. exponential growth produces a “J-shaped” curve (fig. 36.4A) 2. growth is eventually limited by resources, producing an “Sshaped” curve (fig. 36.4C) 3. the m ...
Intraspecific trait variation and colonization sequence alter
... population performance (i.e. b, growth and peak density), 2) competitor establishment success (persistence until the end of the experiment, binary), and 3) disease epidemic severity (infection prevalence integrated over the entire duration of the experiment) using generalized linear mixed effects mo ...
... population performance (i.e. b, growth and peak density), 2) competitor establishment success (persistence until the end of the experiment, binary), and 3) disease epidemic severity (infection prevalence integrated over the entire duration of the experiment) using generalized linear mixed effects mo ...
Michigan Department of Natural Resources 2010-97 Status of the Fishery Resource Report
... pumpkinseed and perch were all growing about one inch slower than state average. The growth rate of the few bass captured appeared to be similar to the panfish at age I, but then much slower by age 2. The reason for the slower growth at age 2 is unknown at this time. However, angling efforts earlier ...
... pumpkinseed and perch were all growing about one inch slower than state average. The growth rate of the few bass captured appeared to be similar to the panfish at age I, but then much slower by age 2. The reason for the slower growth at age 2 is unknown at this time. However, angling efforts earlier ...
Predator-prey-code
... The hare birth rate is constant, as their food supply is unlimited. Hares only die when eaten by a lynx, and the number of hares eaten is proportional to how often hares & lynxes meet, i.e., the chance of a lynx catching a hare. The lynx birth rate is also proportional to how often hares & lynxes me ...
... The hare birth rate is constant, as their food supply is unlimited. Hares only die when eaten by a lynx, and the number of hares eaten is proportional to how often hares & lynxes meet, i.e., the chance of a lynx catching a hare. The lynx birth rate is also proportional to how often hares & lynxes me ...
Study Guide for Final
... Compare R and K strategy for reproduction, give examples. Explain why the size of a population tends to increase. Describe and draw the stages of a typical population growth curve. Identify key components that cause population growth. Identify the factors that ultimately limit population size. ...
... Compare R and K strategy for reproduction, give examples. Explain why the size of a population tends to increase. Describe and draw the stages of a typical population growth curve. Identify key components that cause population growth. Identify the factors that ultimately limit population size. ...
PowerPoint: 5.2: What limits a population?
... Density-Dependent Factors A limiting factor that depends on population size is called a density-dependent limiting factor. The more dense a population is the greater the impact on the size of the population. ...
... Density-Dependent Factors A limiting factor that depends on population size is called a density-dependent limiting factor. The more dense a population is the greater the impact on the size of the population. ...
Predation
... – Group size predicted to increase with increasing predator densities – Group size increases with distance from cover – More animals in group, more vigilance of groups, less per individual. ...
... – Group size predicted to increase with increasing predator densities – Group size increases with distance from cover – More animals in group, more vigilance of groups, less per individual. ...
Direct and indirect community effects of rebuilding plans
... the increase in the target groups. This increase in food availability for the adults could be so large that it outweighs the effects of increased predation on their juveniles and increased competition in their mid-range. In the single-species model, growth and mortality are fixed and the biomass wil ...
... the increase in the target groups. This increase in food availability for the adults could be so large that it outweighs the effects of increased predation on their juveniles and increased competition in their mid-range. In the single-species model, growth and mortality are fixed and the biomass wil ...
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 ...
Interference versus exploitative competition in the regulation of size
... intraspecific interference is more effective than interspecific competition in regulating population dynamics. The sign and strength of interference competition is usually determined by life-history differences between individuals (e.g., differences in body size, sex, strength); therefore, modeling ...
... intraspecific interference is more effective than interspecific competition in regulating population dynamics. The sign and strength of interference competition is usually determined by life-history differences between individuals (e.g., differences in body size, sex, strength); therefore, modeling ...
Density-dependent dispersal may explain the mid
... where N is the population number, r is intrinsic growth rate, and k is per capita emigration rate (see Table 1 for a summary of all the parameters and variables). The initial number of individuals was fixed at ten for all the models. The behavioural response model When emigration is proportional to ...
... where N is the population number, r is intrinsic growth rate, and k is per capita emigration rate (see Table 1 for a summary of all the parameters and variables). The initial number of individuals was fixed at ten for all the models. The behavioural response model When emigration is proportional to ...
population
... life history traits that maximize reproduction • The concepts of K-selection and r-selection are oversimplifications but have stimulated alternative hypotheses of life history evolution ...
... life history traits that maximize reproduction • The concepts of K-selection and r-selection are oversimplifications but have stimulated alternative hypotheses of life history evolution ...
population
... life history traits that maximize reproduction • The concepts of K-selection and r-selection are oversimplifications but have stimulated alternative hypotheses of life history evolution ...
... life history traits that maximize reproduction • The concepts of K-selection and r-selection are oversimplifications but have stimulated alternative hypotheses of life history evolution ...
Study on the Population Carrying Capacity in Northeast China
... carrying capacity significantly. To sum up, the population size is not overload when we consider carrying capacity of a single resource, such as cultivated land and water. The Ecological deficit is 2.115 gha in Northeast China. This paper establishes three projects to calculate ecological optimum po ...
... carrying capacity significantly. To sum up, the population size is not overload when we consider carrying capacity of a single resource, such as cultivated land and water. The Ecological deficit is 2.115 gha in Northeast China. This paper establishes three projects to calculate ecological optimum po ...
MODELS OF SPATIAL SPREAD: A SYNTHESIS
... bounded by the line at which the population is above some small, specified density (Skellam, 1951). For a large enough time, the rate of spread of this detection level is essentially linear in time for one spatial dimension. For the case where the diffusivity is a constant, this rate of spread is 2( ...
... bounded by the line at which the population is above some small, specified density (Skellam, 1951). For a large enough time, the rate of spread of this detection level is essentially linear in time for one spatial dimension. For the case where the diffusivity is a constant, this rate of spread is 2( ...
Impacts of environmental variability in open populations and
... more detailed assumptions about the temporal pattern of variation. For example, assume all growth rates are negative and the rate of change in the environment is sufficiently slow so that the population to a good approximation tracks its moving equilibrium, implying NðtÞ ¼ I=jrðtÞj: Because the rate ...
... more detailed assumptions about the temporal pattern of variation. For example, assume all growth rates are negative and the rate of change in the environment is sufficiently slow so that the population to a good approximation tracks its moving equilibrium, implying NðtÞ ¼ I=jrðtÞj: Because the rate ...
Oceanic Fisheries Management Project Stock Assessment
... recruitment to the exploitable stock has become significantly reduced. The situation is characterized by a greatly reduced spawning stock. If prolonged, recruitment overfishing can lead to stock collapse, particularly under unfavourable environmental conditions. (Restrepo 1999) (ii) Growth overfishi ...
... recruitment to the exploitable stock has become significantly reduced. The situation is characterized by a greatly reduced spawning stock. If prolonged, recruitment overfishing can lead to stock collapse, particularly under unfavourable environmental conditions. (Restrepo 1999) (ii) Growth overfishi ...
Contribution to vital statistics of a guppy Poecilia
... The identical condition factors (fitting constant a) suggest that feeding conditions were equally good for both sexes in the field and that field conditions were equally good to those in the lab, where individuals were feed ad libitum, i.e., under excess food. It should be noted that in FishBase the ...
... The identical condition factors (fitting constant a) suggest that feeding conditions were equally good for both sexes in the field and that field conditions were equally good to those in the lab, where individuals were feed ad libitum, i.e., under excess food. It should be noted that in FishBase the ...
Introduction On October the 6th, the Commission tabled a
... Oceana believes that the inclusion of conservation reference points can help to ensure that fish stocks are maintained in good condition. We therefore acknowledge the good intentions with the conservation reference points expressed as biomass levels. However, as these levels are based on the precaut ...
... Oceana believes that the inclusion of conservation reference points can help to ensure that fish stocks are maintained in good condition. We therefore acknowledge the good intentions with the conservation reference points expressed as biomass levels. However, as these levels are based on the precaut ...
Population dynamics of large and small mammals
... driving changes in numbers. I adopt the second approach here with the background assumption that this will provide the most useful information for natural resource management. I have described this elsewhere as the mechanistic paradigm (Krebs 2002), and I use the term ‘control’ in this paper to refe ...
... driving changes in numbers. I adopt the second approach here with the background assumption that this will provide the most useful information for natural resource management. I have described this elsewhere as the mechanistic paradigm (Krebs 2002), and I use the term ‘control’ in this paper to refe ...
Why Are There So Many of Us
... growth have occurred. One began with the end of the Paleolithic and the beginning of the agricultural revolution; another occurred at the beginning of the Industrial Revolution (Deevey, 1960; Hassan, 1981). As of 1990, more humans have been added to the total world population in the past forty years ...
... growth have occurred. One began with the end of the Paleolithic and the beginning of the agricultural revolution; another occurred at the beginning of the Industrial Revolution (Deevey, 1960; Hassan, 1981). As of 1990, more humans have been added to the total world population in the past forty years ...
Fishery data collection in the Pacific
... Artisanal (tuna) fisheries monitoring • Artisanal tuna fisheries monitoring program – Biological and economic orientation – Ongoing monitoring in some countries, however not without challenges (coverage) – Log sheet, length frequency, activity counts ...
... Artisanal (tuna) fisheries monitoring • Artisanal tuna fisheries monitoring program – Biological and economic orientation – Ongoing monitoring in some countries, however not without challenges (coverage) – Log sheet, length frequency, activity counts ...
Chapter 35-Population Dynamics 2
... – However, human economic and political pressures often outweigh ecological concerns – There is frequently insufficient scientific information ...
... – However, human economic and political pressures often outweigh ecological concerns – There is frequently insufficient scientific information ...