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Chp 4 PowerPoint
Chp 4 PowerPoint

...  Organisms facing extreme ...
The response of koalas to a changing environment
The response of koalas to a changing environment

... result of koalas' low tolerance for prolonged hot weather and the potential for more extreme and frequent bushfires. Furthermore, koala food resources may decline due to climateinduced changes in the composition and structure of eucalypt communities, and the nutritional quality and moisture content ...
Managing Post-Fire Habitat for Birds
Managing Post-Fire Habitat for Birds

... critical role of fire in shaping and maintaining the ecosystem there is a growing need to understand the value of habitats created by wildfire and the critical elements required by the unique and relatively diverse avian community that occupy them. Post-fire habitats are not blank slates or catastro ...
Transect + species presentation
Transect + species presentation

... Abiotic factors found along the tape are noted down ...
New Title
New Title

... Answer the following questions on a separate sheet of paper. 1. How does natural selection produce adaptations in a species? 2. What is an organism’s niche? 3. How do adaptations enable organisms to reduce competition for food and other resources? ...
Population density
Population density

... Biotic potential and reproductive strategies vary • Biotic potential = the ability of an organism to produce offspring • K-selected species = animals with long gestation periods and few offspring – Have a low biotic potential – Stabilize at or near carrying capacity – Good competitors ...
B 262, F 2002 Name
B 262, F 2002 Name

... because of the speed with which individuals died. The 80-95% of those infected who died, died very rapidly and could not reproduce or finish reproducing one infected. Tuberculosis had a less pronounced effect upon European populations despite its higher mortality rate because many individuals (95%) ...
1 Southern Sea Otters: Are They Back from the Brink (邊緣) of
1 Southern Sea Otters: Are They Back from the Brink (邊緣) of

... 2. Pollution from water run‐off 3. Global warming ...
Ecosystem Based Management in the National Marine Sanctuary
Ecosystem Based Management in the National Marine Sanctuary

... qualities, including its contribution to biological productivity, maintenance of ecosystem structure, maintenance of ecologically or commercial important or threatened species or species assemblages, maintenance of critical habitat of endangered species, and biogeographic representation of the site… ...
Ecosystems: Everything is Connected
Ecosystems: Everything is Connected

... • Every population is part of a community. • The most obvious difference between communities is the types of species they have. ...
Understanding Our Environment
Understanding Our Environment

... Gause - No two species can coexist in the same niche indefinitely. ...
04populations2 3564KB Nov 01 2012 07:59:58 AM
04populations2 3564KB Nov 01 2012 07:59:58 AM

... unlimited, though. • As population rises, resources decline. • If the growth is too rapid, resources are rapidly depleted and a population crash can occur • This pattern occurs often with many populations (including humans) • For example... ...
Population Cycles - Liberty Union High School District
Population Cycles - Liberty Union High School District

... Many; small; high biotic potential ...
Unit 10 Study Guide Answers
Unit 10 Study Guide Answers

... is exponential growth? population multiplies by a constant factor at constant time intervals there are few factors that stop overall growth.What are a few factors that would limit growth? Density dependent and Density independent factors ...
Great Cats and Rare Canids Act of 2005
Great Cats and Rare Canids Act of 2005

... is considered the most endangered cat species in the world due to its low total numbers, the fragmentation and the availability of habitat, and small geographic range limited to Spain and Portugal. Population decline has been due to the spread of a disease which decimated populations of the European ...
Population Ecology - Ms. Lee`s Classes @ JICHS
Population Ecology - Ms. Lee`s Classes @ JICHS

... You are all working competitively and in the interest of survival. Your goal is to identify the marked individuals, which will make predators aware of them and they will be eaten. You are doing this because you are trying to confuse the humans and make their data unreliable. When the humans recaptur ...
Population Ecology - HRSBSTAFF Home Page
Population Ecology - HRSBSTAFF Home Page

... density and type of tree. Also, each biome can contain an assortment of different habitats. Each habitat contains its own combination of organisms and abiotic conditions. ...
How do they get their food?
How do they get their food?

... • Ok, will select a patch based on food quality that gives good balance when it enters the patch. • But patch becomes depleted as it stays in the patch. • When should it leave??? ...
1.4.1 - 1.4.4 Ecology, Ecosystem, Biosphere, Habitat
1.4.1 - 1.4.4 Ecology, Ecosystem, Biosphere, Habitat

... environment, obtain energy and nutrients, and avoid predators. ...
How do they get their food?
How do they get their food?

... • Ok, will select a patch based on food quality that gives good balance when it enters the patch. • But patch becomes depleted as it stays in the patch. • When should it leave??? ...
1.4.1 - 1.4.4 Ecology, Ecosystem, Biosphere, Habitat
1.4.1 - 1.4.4 Ecology, Ecosystem, Biosphere, Habitat

... environment, obtain energy and nutrients, and avoid predators. ...
Eumadicole midges – film stars of the freshwater world
Eumadicole midges – film stars of the freshwater world

... The seemingly secretive madicolous habitats are often ignored and overlooked in stream surveys. This means that their extent and significance to aquatic biodiversity and ecosystem functioning is unknown. Furthermore, while these habitats might be perceived as commonplace, they are often very patchy i ...
Populations - Liberty Union High School District
Populations - Liberty Union High School District

... 2. Population size (and density) increases, the growth rate decreases. 3. The population approaches the carrying capacity, K, the number of individuals that the environment can support ...
Monitoring Wood Thrush Habitat using Geographical Information
Monitoring Wood Thrush Habitat using Geographical Information

... Cornell Lab of Ornithology concluded from their research that conservation efforts for the Wood Thrush are of little concern though numbers are significantly decreasing. But when you put all facts in perspective, population surveys (1966-2009) has the U.S. Wood Thrush population decline at a consis ...
Know
Know

... C. Pollution - Settles into water, air, and soil. Is absorbed by plants and animals. Can affect food chain and cause birth defects. Example: Birds with malformed beaks 4. Disease - Infectious diseases can spread from one organism to another OR species to species! Example: Flu, cold, smallpox, polio, ...
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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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