Population ecology is the study of populations in relation to their environment. Key concepts include population size, density, growth rates, and limiting factors. Population growth can be exponential in unlimited environments but becomes logistic as resources are depleted. The logistic model describes sigmoid growth with a carrying capacity K, where population growth rate is highest at N=K/2. Natality, mortality, immigration, and emigration influence population size. Estimating population density can involve direct counts, sampling methods like quadrats, or capture-recapture of marked individuals.
Exponential growth: Resource (food and space) availability is
obviously essential for the unimpeded growth of a population.
Ideally, when resources in the habitat are unlimited, each species
has the ability to realise fully its innate potential to grow in number,
as Darwin observed while developing his theory of natural
selection.
Exponential growth: Resource (food and space) availability is
obviously essential for the unimpeded growth of a population.
Ideally, when resources in the habitat are unlimited, each species
has the ability to realise fully its innate potential to grow in number,
as Darwin observed while developing his theory of natural
selection.
Community ecology, study of the organization and functioning of communities, which are assemblages of interacting populations of the species living within a particular area or habitat.
Characteristics of Population PPT covers all the types of Age Distribution Methods,Growth Rates,Population Density,Gender Ratio,Pattern of Distribution ,etc.
A population is generally a group of particular species occupying a particular area at a specific time. Some of the ecologists however recognize two types of population;
Monospecific population- a population with individuals only one species
Mixed or Polyspecific population- a population of more than one species
However in Ecology, a polyspecific population is considered as a COMMUNITY, and the term POPULATION is used for a group of individuals of any kind of organism.
POPULATION ECOLOGY is the study of individuals of the same species where the processes are aggregation, interdependencies between individuals etc, and the various factors governing such processes are emphasized.
This presentation is on carrying capacity of the ecosystem. Here in the presentation we explained about the ecosystem and it's example. It also explained about the the how population and growth pattern takes place in particular a ecosystem and it's effect on carrying capacity.This presentation is taken by Dr. Sachin mandavgane faculty of chemical engineering VNIT Nagpur as a part of our course in sustainable engineering.
It is as per the syllabus of M.Sc. NRM including detailed study of population ecology
It describes the meaning of population with respect to ecology and includes population attributes, dynamics, dispersal, Population growth models, survivorship curves and limitations.
It also entails factors that influence and regulate population growth on the basis of density.
Community ecology, study of the organization and functioning of communities, which are assemblages of interacting populations of the species living within a particular area or habitat.
Characteristics of Population PPT covers all the types of Age Distribution Methods,Growth Rates,Population Density,Gender Ratio,Pattern of Distribution ,etc.
A population is generally a group of particular species occupying a particular area at a specific time. Some of the ecologists however recognize two types of population;
Monospecific population- a population with individuals only one species
Mixed or Polyspecific population- a population of more than one species
However in Ecology, a polyspecific population is considered as a COMMUNITY, and the term POPULATION is used for a group of individuals of any kind of organism.
POPULATION ECOLOGY is the study of individuals of the same species where the processes are aggregation, interdependencies between individuals etc, and the various factors governing such processes are emphasized.
This presentation is on carrying capacity of the ecosystem. Here in the presentation we explained about the ecosystem and it's example. It also explained about the the how population and growth pattern takes place in particular a ecosystem and it's effect on carrying capacity.This presentation is taken by Dr. Sachin mandavgane faculty of chemical engineering VNIT Nagpur as a part of our course in sustainable engineering.
It is as per the syllabus of M.Sc. NRM including detailed study of population ecology
It describes the meaning of population with respect to ecology and includes population attributes, dynamics, dispersal, Population growth models, survivorship curves and limitations.
It also entails factors that influence and regulate population growth on the basis of density.
Population ecology is a field of scientific research that examines the dynamics of populations of living organisms within a given environment. It involves the study of various aspects of populations, including their growth, distribution, density, age structure, and the factors that affect these attributes. Key components of population ecology include:
Population Dynamics: Population ecologists study how the size of a population changes over time. This involves examining birth rates (natality), death rates (mortality), immigration, and emigration.
Population Distribution: Understanding how individuals in a population are spatially distributed is essential. Populations can be clumped, evenly dispersed, or randomly distributed in a habitat.
Population Density: This refers to the number of individuals of a species per unit area or volume of habitat. Population density can have significant ecological and environmental implications.
Age Structure: The age distribution within a population can provide insights into its growth potential and reproductive capacity. It can help in predicting future population trends.
Population Growth Models: Population ecologists use mathematical models to describe and predict population growth, such as exponential and logistic growth models.
Limiting Factors: Population growth is limited by various factors, including availability of resources, predation, competition, disease, and environmental conditions. Population ecologists study how these factors influence population dynamics.
Carrying Capacity: The carrying capacity of an environment is the maximum population size that can be sustained by available resources without causing environmental degradation or resource depletion.
Interactions: Populations do not exist in isolation. Interactions with other species, such as predation, competition, and mutualism, are essential considerations in population ecology.
Conservation and Management: Population ecology plays a critical role in the conservation and management of endangered species and ecosystems. It helps in making informed decisions to protect and sustainably manage populations.
Research Methods: Population ecologists employ various field and laboratory techniques, including population censuses, mark and recapture studies, and modeling, to gather data and understand population dynamics.
Ppt is made vailable for public for scientifc use.
Population ecology concept and its characteristics explained by using practical examples in a simple language. data is significant for competitive examinations
Population ecology is the study of how populations — of plants, animals, and other organisms — change over time and space and interact with their environment. Populations are groups of organisms of the same species living in the same area at the same time.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
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Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
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We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
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And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
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2. Population EcologyPopulation Ecology
Population ecology is the study of
populations in relation to the
environment. It includes environmental
influences on population density and
distribution, age structure, and variations
in population size.
4. Population sizePopulation size
“In population genetics and
population ecology, population size
(usually denoted N) is the number of
individual organisms in a population”.
Factors that Govern Population Size
1.Crude Birth Rate (CBR)
2.Crude Death Rate (CDR)
3.Immigration
4.Emigration
5. Factors That Increase Population Size
1.Natality is recruitment to a population
through reproduction.
2.Immigration from external populations e.g.
Bird migration.
Factor Reducing Population Size
1.Mortality which is the death rate from any
source e.g. predation.
2.Emigration, where individuals leave the
population for another habitat.
6.
7. NatalityNatality
The production of new
individuals by birth, hatching,
germination or fission
2 aspects of reproduction must
be distinguished:
Fecundity
fertility
8. NatalityNatality
Fecundity-physiological notion that refers to
an organism’s potential reproductive capacity
Fertility-ecological concept based on the no.
of viable offspring produced during a period
time
Realized fertility and potential fecundity-we
must be able to distinguish between them
9. NatalityNatality
E.g, realized fertility rate for a
human pop may be only 1 birth per
15 years per female in the child-
bearing ages
While the potential fecundity rate
for humans is 1 birth per 10 to 11
months per female in the
childbearing ages
10. MortalityMortality
Biologists-interested not only in why
organisms die but also why they die
at a given age
Longevity-the age of death of
individuals in a population
2 types:
◦ Potential longevity
◦ Realized longevity
11. MortalityMortality
Potential longevity
◦ The maximum life span of an individual of
a particular sp is a limit set by the
physiology of the organism, such that it
simply dies of old age
◦ The average longevity of individuals living
under optimum conditions
◦ However, organisms rarely live under
optimum conditions-most die from
disease, or eaten by predators or succumb
to a number of natural hazards
14. Have more births than deaths?
◦ Population increases
Have more deaths than births?
◦ Population decreases
Have equal amounts of births and deaths?
◦ Population remains constant
What happens to the populationWhat happens to the population
when we….when we….
18. EmigrationEmigration
“E” means ‘out’
Migrate means to move from one
place to another
Emigrate means individuals moving out of
one place and into another
Young wolves and bears leaving as they
mature
Shortage of food
19.
20. NATALITYNATALITY
The birthrate, which is the ratio of total live
births to total population in a particular area
over a specified period of time
MORTALITYMORTALITY
The death rate, which is also the ratio of the
total number of deaths to the total population.
IMMIGRATIONIMMIGRATION
The number of organisms moving into area
occupied by the population is called
immigration.
EMIGRATIONEMIGRATION
The number of organisms moving out of the
area occupied by the population is called
emigration.
21. How to estimate populationHow to estimate population
density?density?
Techniques differ between organisms
such that the technique to estimate deer
cannot be applied to bacteria or protozoa
or vice versa
There are 2 fundamental attributes that
affect and ecologists choice of technique
for population estimation
23. Why the need to estimateWhy the need to estimate
population density?population density?
Estimates of population are made for two
reasons:
◦ How to quantify nature – ecologist role
◦ Estimates are allows for comparisons between
different populations in terms of space and time
measure
24. 2 BROAD APPROACHES TO ESTIMATE POP DENSITY
Absolute density
No of individual per area/ per volume
Important for conservation and management
Relative density
Comparative no of organisms
Two areas of equal sizes, which area has more organism
e.g, between area x and y
Area x has more organism than area y
25. ABSOLUTE DENSITYABSOLUTE DENSITY
Making total counts and by using
sampling methods
Total counts - direct counting of
populations
- human pop census,
- trees in a given area,
- breeding colonies can be photographed
then later counted
- in general total counts are possible for
few animals
26. Measurements of Absolute densityMeasurements of Absolute density
Sampling methods
◦ to count only a small proportion
of the population - sample
Using the sample to estimate
the total population
2 general sampling techniques:
1) Use of quadrats
2) Capture-recapture method
27. Use of Quadrats
Count all individuals on several quadrats of known size,
then extrapolate the average count to the whole area
Quadrat- a sampling area of any shape (may be a
rectangle, triangle or circle)
3 requirements:
• the pop in the quadrat must be determined exactly
• area of the quadrant must be known
• quadrant/s must be representative of the area
• achieved by random sampling
28. Quadrant sampling in plantQuadrant sampling in plant
populationpopulation
Conduct a transect in the upland
hardwood forest
3 transect line, 110 meters long, count all
trees taller than 25cm within 1meter of
each line
By utilizing the quadrant method sampling
for old trees and seedlings, we can
determine if populations were likely to
change over time
29. Capture Recapture Method
Capture, marking, release, and recapture-important for mobile animals
Why?-it allows not only an estimate of density but also estimates of birth rate
and death rate for the population being studied
Capture animal, mark (tag) them and then release them
Peterson method:
Involves 2 sampling periods
Capture, mark and release at time 1
Capture and check for marked animals at time 2
Time intervals between the 2 samples must be short because this method
assumes a closed population with no recruitment of new individuals into the
Population between time 1 and 2 and no losses of marked individuals
30. Formula for capture-recaptureFormula for capture-recapture
methodmethod
Marked animals in 2nd
sample = Marked animals in 1st
sample
Total caught in 2nd
sample Total population size
31. e.g of capture recapture methode.g of capture recapture method
Dahl marked trout in small
Norwegian lakes to estimate the size
of the population that was subject
to fishing. He marked and released
109 trout, and in 2nd
sample a few
days later caught 177 trout, of which
57 were marked. From the data,
what is the estimate population size?
32. e.g of capture recapture methode.g of capture recapture method
By using the formula
57 = 109
177 Total pop size
Total pop size = (109 X 177)
57
= 338 trout
33. RELATIVE DENSITYRELATIVE DENSITY
Traps – no caught per day per trap –
animals caught will depend on their density,
activity and range of movement, skill in
placing traps – rough idea of abundance –
night flying insects, pitfall traps for beetles,
suction traps for aerial insects
Fecal pellets – rabbits, deer, field mice –
provides an index of pop size
Vocalization frequency – bird calls per 10
mins, can be used for frogs, cicadas,
crickets
Pelt records – trapper records dates back
300 years – of lynx
34. Relative densityRelative density
Catch per unit effort – index of fish abundance –
no of fish per cast net or no of fish per 1 hour
trawling
Number of artifacts – thing left behind – pupal
cases of emerging insects
Questionnaires – to sportsmen (eg fish)and
trappers
Cover - % ground surface covered – in botany,
invertebrate studies of the rocky intertidal zone
Feeding capacity – bait taken – for rats and mice –
index of density
Roadside counts – birds observed while driving
standard distances
37. Population dispersion patterns
Random-when the position of each
individuals in a pop is independent of
the others
Uniform-it results as a form of some
negative interactions
Common among animal pop where
individuals defend an area for their own
exclusive use (territoriality) or in plant
pop where severe competition exist for
belowground resources, i.e water or
nutrients
38. Population dispersion patternsPopulation dispersion patterns
Clumped-where individuals
occur in groups
Reason-suitable habitat or
resources may be distributed as
patches on a larger landscape
40. Population growthPopulation growth
Refers to how the number of
individuals in a population increases or
decreases with time (N, t)
Reflects the difference between rates
of birth and death
in pop, if new births occur
in pop, if death occurs
41. 2 types of pop growth
Exponential population growth
dN = rmaxN
dt
Logistic population growth
dN = rmaxN (K-N)
dt K
Population
Growth
Mathematically
Defined
43. Exponential GrowthExponential Growth
Continuous population growth in an unlimited
environment can be modeled exponentially.
dN / dt = rmax N
Appropriate for populations with overlapping
generations.
◦ As population size (N) increases, rate of population
increase (dN/dt) gets larger.
44. Exponential GrowthExponential Growth
For an exponentially growing population, size
at any time can be calculated as:
Nt = Noert
Nt = number individuals at time t.
N0 = initial number of individuals.
e = base of natural logarithms.
r (= rmax ) = per capita rate of increase.
t = number of time intervals.
45. PracticePractice
If the human population size in 1993 was
5.4 billion, what was the projected
population size in the year 2000?
r=0.0139
No = population size in 1993 = 5.4 billion
t = 7 years (year 2000 - 1993)
r = 0.0139
46. Nt = No ert
Nt = (540,000,000) e(0.0139)(7)
Nt /540,000,000 = e 0.0973
Dust off your high school math skills. To get rid
of the exponent, simply take the (ln) of both
sides of the equation. Remember, when we
take the natural log of a quotient we end up
taking the ln of one value and subtracting it
from the ln of the other value (see below).
47. ln (Nt /540,000,000) = ln (e 0.0973)
[here we're taking the natural log of the
quotient]
= ln(Nt) - ln(540,000,000) = 0.0973
[rewrite it as natural log of one value
minus natural log of the other value]
Nt = 595,000,000 or 5.95 billion
48.
49. Logistic Population GrowthLogistic Population Growth
As resources are depleted, population growth
rate slows and eventually stops: logistic population
growth.
◦ Sigmoid (S-shaped) population growth curve.
◦ Carrying capacity (K) is the number of individuals of a
population the environment can support.
Finite amount of resources can only support a finite number of
individuals.
50. Logistic Population GrowthLogistic Population Growth
dN/dt = rmaxN(1-N/K)
rmax = Maximum per capita rate of increase under
ideal conditions.
When N nears K, the right side of the equation
nears zero.
◦ As population size increases, logistic growth rate
becomes a small fraction of growth rate.
Highest when N=K/2.
N/K = Environmental resistance.
51. ProblemProblem
Suppose a population of butterflies is
growing according to the logistic
equation. If the carrying capacity is
500 butterflies and r = 0.1 individuals/
(individual*month), what is the
maximum possible growth rate for
the population?
52. To solve this, you must first determine
N, population size. From the plot of dN/dt
vs. N, we know that the maximum
possible growth rate for a population
growing according to the logistic model
occurs when N = K/2, here N = 250
butterflies. Plugging this into the logistic
equation:
DN/dt = rN [1- (N/K)]
= 0.1(250)[1-(250/500)]
= 12.5 individuals / month
56. Limits to Population GrowthLimits to Population Growth
Environment limits population growth by altering
birth and death rates.
Density-dependent factors
Disease, Parasites, Resource Competition
Populations do not show continuous geometric increase
When density increases other organisms reduces the fertility and
longevity of the individuals in the population
This reduces the rate of increase of the pop until eventually the pop
ceases to grow
The growth curve is defined as the sigmoid curve, S – shaped
K = carrying capacity (upper asymptote or maximum value) – the
maximum number of individuals that environment can support
Density-independent factors
Natural disasters
Climate
57. r- and k-speciesr- and k-species
Characteristics of r- species
high biotic potential
Rapid development
Early reproduction
Single period reproduction per individual
Short lifecycle
Small body size
Regulated by the density-
independent factor
58. Characteristics of k- species
low biotic potential
slow development
delayed reproduction
multiple period reproduction per individual
long lifecycle
large body size
Regulated by the density-dependent
factor
59. Life history strategiesLife history strategies
K and r selection (MacArthur and Wilson 1967)
r-selected species
•r refers to the per capita rate of increase
•Selection favoring rapid growth
•Should be favored in new or disturbed
environments
•Less competition
K-selected species
•K refers to carrying capacity
•More prominent in species that are
typically at their carrying capacity
•Favors more efficient use of resources
•Live with competition