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Young Forest Habitat - Department of Plant Science
Young Forest Habitat - Department of Plant Science

... changes over time. The textbook example is an abandoned agricultural field – an area where disturbance has created bare soil with no plants. The first species to appear are seedlings adapted to quickly colonize this open ground. Over time, the vegetation transitions from short-lived opportunists to ...
Appendix 1 Definition of the main Allee effect
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... population may suffer one to more component Allee effects. However, a component Allee effect in a population may not always generate a demographic Allee effect, which depends on more complex factors, such as life-history traits, resource availability, predation and disturbance. Demographic Allee eff ...
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... patterns.  I can differentiate between exponential growth and logistic growth.  I can define and identify density-dependent and density-independent limiting factors. ...
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Abiotic/Biotic factors - SandyBiology1-2

... – Air Temperature – Wind Speed – Sunlight Intensity – Soil Nutrients ...
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Relationships Within Ecosystems

... E. One organism benefits but the other does not benefit and is not harmed. F. parasitism ...
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the Importance of Habitat Characteristics for Farmland Breeding
the Importance of Habitat Characteristics for Farmland Breeding

... 1.6 Why Eurasian curlew? Currently, the agricultural landscapes in the north-eastern parts of Sweden are the stronghold of the Eurasian curlew in Sweden. Here, the species is widely appreciated as “the herald of spring” and functions as a flagship species in farmland biodiversity conservation. In Eu ...
Chapter 52
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Ecosystems - WordPress.com
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Ch54Test with answers

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Extending the concept of keystone species to

... weight (dominance status). This comes with the limitation that it is not a statistical model and does not account for any deviations from the mean (Hurlbert 1997); and that such a simple linear scaling does not hold in general (Libralato et al. 2006). Except for some trivial reference models, we can ...
Ecosystems OLE
Ecosystems OLE

... Most organisms do not live all alone in their habitat. Instead, organisms live together in populations and communities that interact with abiotic factors in their ecosystems. Organisms Black-tailed prairie dogs that live in prairie dog towns are all members of one species. A species is a group of or ...
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ASPECTS OF HABITAT FRAGMENTATION – ANALYSING A

... on species). Increasing fragmentation in habitat patches decreases the probability of successful dispersal between these patches and increases the potential for nest predators from nearby non-habitat. Therefore, areas that have less habitat edge and are a greater distance from the edge provide bette ...
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... Opportunistic species are short-lived and are early to reproduce. They produce many offspring, each of which receives little to no care. Examples are weeds and insects. Equilibrium species are long-lived and late-maturing, and they produce a small number of offspring that receive extended parental c ...
The Living Earth
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... another consumer. The prey is the consumer that gets eaten. When you think of how organisms interact, you probably think of predator-prey relationships. However, there are many other ways that organisms affect each other! A close relationship between two species is called symbiosis. There are three ...
Ecology Reading and Review
Ecology Reading and Review

... another consumer. The prey is the consumer that gets eaten. When you think of how organisms interact, you probably think of predator-prey relationships. However, there are many other ways that organisms affect each other! A close relationship between two species is called symbiosis. There are three ...
non-breeding season considerations for the conservation of
non-breeding season considerations for the conservation of

... The shift to management of the diverse set of neotropical migratory birds (NTMBs), however, requires that we recognize that populations of these species are potentially limited on scales much larger than just local. For this reason, local management practices may or may not result in population incr ...
Ecosystem Dynamics
Ecosystem Dynamics

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What is ecology? - life.illinois.edu
What is ecology? - life.illinois.edu

... using dormant seeds in the soil? • C-Nicole: How do predators and prey influence each others’ life history traits? • P-Brad: How does genetic structure of amphibians vary in forest vs. grasslands? • Jinelle: Is habitat use by rat snakes due to variation in prey # or the snake’s thermal ecology? ...
APES C5L2 What Limits the Growth of Populations?
APES C5L2 What Limits the Growth of Populations?

... J-Curves and S-Curves • Environmental resistance is the combination of all factors that ...
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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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