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Ecosystem - mssarnelli
Ecosystem - mssarnelli

... – What types of communities do you see (or not see, but know are there)? – What populations of organisms do you see (or not see, but know are there)? – For three organisms, describe the habitat and niche of each organism ...
Vulnerable Victorians - Department of Environment, Land, Water
Vulnerable Victorians - Department of Environment, Land, Water

... The pair built a nest in the aviary and a chick was hatched. A week later the chick's parents were released into the wild, as so many have been over the past decade, in an effort to rescue the species from extinction. This project has also brought together a huge range of scientists: from ornitholog ...
Workshop on Population Ecology I. Pre
Workshop on Population Ecology I. Pre

... Type II - Likelihood of death is approximately the same in all age classes, and curve is linear from birth to maximum age (e.g., many small "prey type" animals) Type III: - Very high juvenile mortality, but stable survival rate once the critical juvenile period has passed. (e.g., animals with free-s ...
Unit 5
Unit 5

... accurate when there are more numerous or larger sample plots and when the habitat is homogenous. In some cases, population sizes are estimated not by counts of organisms but by indirect indicaters. Another sampling technique commonly used to estimate wildlife population is the mark-recapture method. ...
Midterm 2013 Review
Midterm 2013 Review

... 1. Lipids are more commonly known as Fats or Waxes and are hydrophobic or dislike water. 2. They make up the membranes of cells which are composed of a lipid bilayer. 3. They are used to store energy in the body in long chains these chains are made out of Fatty acid and Glycerol molecule. 4. Lipids ...
Ecosystems - physicslocker.com
Ecosystems - physicslocker.com

... Effects of environmental change Animals are adapted to suit their environment, helping them survive and reproduce. However if the environment changes they may no longer have this advantage. A change in environment can cause extinction. Extinction is when the last individual of a species dies. When ...
Ecosystem - mssarnelli
Ecosystem - mssarnelli

... – What types of communities do you see (or not see, but know are there)? – What populations of organisms do you see (or not see, but know are there)? – For three organisms, describe the habitat and niche of each organism ...
Chapter 4 notepacket
Chapter 4 notepacket

... f. Population with __________________ age distribution will most likely remain ___________________ (birth = death) g. Populations made up of mostly post-reproductive individuals will likely _______________________ over time h. Populations made up of mostly pre-reproductive individuals will likely __ ...
Predator-prey interactions: lecture content
Predator-prey interactions: lecture content

... where Nt = population size at time t, before mortality factor i acts; Nt+1 = population at time t+1, after it acts  Ki’s are mortality factor (like qx); their value is that they are additive, allow partition of mortality into components ...
Evolution - BIOLOGY 11
Evolution - BIOLOGY 11

... • The thin layer of air, land, and water on or near Earth’s surface in which all living things on Earth exist. ...
Ecosystem - mssarnelli
Ecosystem - mssarnelli

... – What types of communities do you see (or not see, but know are there)? – What populations of organisms do you see (or not see, but know are there)? – For three organisms, describe the habitat and niche of each organism ...
File
File

... – Abiotic factors (weather, natural disasters) – Effects population all the same – Opportunistic life history pattern ...
Exam 6 Review Key
Exam 6 Review Key

... Ecosystem: biotic and abiotic factors Global: the entire biosphere, and how humans impact the biosphere 3. Which regions on Earth receives the most solar radiation per unit over a year? A. North Pole B. 30-degrees N and 30-degrees S latitude C. South Pole D. Equator 4. Describe Hadley cells and how ...
Biology 30 Chapter 20 - Vegreville Composite High
Biology 30 Chapter 20 - Vegreville Composite High

... 20.2 – Interactions in Ecological Communities ...
1.5 a study of an ecosystem
1.5 a study of an ecosystem

... Brief description of the hedgerow was made An area of the hedgerow was marked off and mapped Within this particular area 22 snails were collected Snails were marked with paint and released One week later, same habitat – 20 snails were collected and it was found that 9 had the paint marks – Formula u ...
File
File

... • A niche describes everything about the way an organism lives – place, food source, time of activity, reproductive areas, watering holes etc. • If two organisms exist in a community with the same niche what would happen? ...
Population Dynamics Notes
Population Dynamics Notes

... • All populations have this ability, although not all populations realized this type of growth • Darwin pondered the question of exponential growth. He knew that all species had the potential to grow exponentially • He used elephants as an example because elephants are one of the slowest breeders on ...
Item 25 battistone atus Review for the Northern Spotted Owl
Item 25 battistone atus Review for the Northern Spotted Owl

... Flying squirrels (Glaucomys sabrinus) and woodrats (Neotoma sp.) are primary component of diet throughout most of the range. • Flying squirrels are main component in North (much of Washington and Oregon) • Woodrats are the main component in the southern portion of the range (California and parts of ...
CHAPTER 8: POPULATION ECOLOGY Outline 8
CHAPTER 8: POPULATION ECOLOGY Outline 8

... 3. The sigmoid (s-shaped) population growth curve shows that the population size is stable, at or near its carrying capacity. F. When population size exceeds its carrying capacity, organisms die unless they move or switch to new resources. 1. Exponential growth leads to logistic growth and may lead ...
Population Dynamics Miller 11th Edition Chapter 10
Population Dynamics Miller 11th Edition Chapter 10

... Variations in genetic diversity can affect small, isolated populations. Most large pops. genetic diversity remains fairly constant. Genetic variations that can affect small populations could include: 1. Founder effect – few individ. colonize a new area that’s geographically isolated from others in t ...
Chapter 8
Chapter 8

... Prereproductive age: not mature enough to reproduce. (majority here = growing pop) Reproductive age: those capable of reproduction. Postreproductive age: those too old to reproduce. ( majority here = declining pop) Even distribution in age structure = stable pop ...
Ch43 Lecture-Populations
Ch43 Lecture-Populations

... What’s the take away about resource acquisition? The more we take, the more resources are available to us as humans, the less available they are to other organisms. This leads to stress on an community and can lead to death, extinction, loss of diversity. ...
Slide 1
Slide 1

... Dispersion patterns and dispersal – dispersion - spatial pattern or distribution pattern of individuals in a population; can have random, clumped, and uniform patterns – dispersal - outward movements of individuals away from their established areas of activity; some animals must leave natal areas (p ...
Vinod Mathur_2e
Vinod Mathur_2e

... Occasionally crop damage by wild herbivores is high. Small size limits resource availability. ...
The changes in population size
The changes in population size

... The changes in population size (population growth) can be communicated in graphs. Birth rate (number of organisms born) causes an increase in population size. Mortality (number or organisms that die) causes a decrease in population size. Besides birth and death rate, other factors will affect the po ...
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Source–sink dynamics

Source–sink dynamics is a theoretical model used by ecologists to describe how variation in habitat quality may affect the population growth or decline of organisms.Since quality is likely to vary among patches of habitat, it is important to consider how a low quality patch might affect a population. In this model, organisms occupy two patches of habitat. One patch, the source, is a high quality habitat that on average allows the population to increase. The second patch, the sink, is very low quality habitat that, on its own, would not be able to support a population. However, if the excess of individuals produced in the source frequently moves to the sink, the sink population can persist indefinitely. Organisms are generally assumed to be able to distinguish between high and low quality habitat, and to prefer high quality habitat. However, ecological trap theory describes the reasons why organisms may actually prefer sink patches over source patches. Finally, the source-sink model implies that some habitat patches may be more important to the long-term survival of the population, and considering the presence of source-sink dynamics will help inform conservation decisions.
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