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Lower Columbia River Limiting Factors (Metrics?) Total = 64
Lower Columbia River Limiting Factors (Metrics?) Total = 64

... Water Quality Limiting Factors 15. Altered stream temperature regimes, 16. Reduced dissolved oxygen concentrations, 17. Excessive turbidity, 18. Nutrient over‐enrichment, 19. Bacteria, and 20. Chemical contaminants (from point and non‐point sources). Habitat Diversity Limiting Factors 21. Complete l ...
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No Slide Title

... • Reproducing early shortens the generation time, or the average time it takes a member of the population to reach the age when it reproduces. ...
Chapter 8 Population Ecology Definitions and concepts
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... • Biotic potential: populations capacity for growth • Intrinsic rate of increase or growth (r): rate at which a population would grow if it had unlimited resources. (per capita rate of increase, maximum capacity to reproduce) Characteristics of species with high r • reproduce early in life • short g ...
population size
population size

... Predation is another major density-dependent factor that will limit population growth. If a prey species has a large, dense population, individuals may end up in poor health as a result of intense competition for food. These individuals are easier for the predator to ...
Review for Environmental Systems Fall Final Exam 2015
Review for Environmental Systems Fall Final Exam 2015

... Individuals will die because resources are depleted. The population will level off at the carrying capacity of the environment. List three factors that will reduce competition within a population. Adequate food, water, shelter, limited predators, smaller populations will reduce competition. Why is i ...
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Julie Adamo INLS 720/Metadata Final Project December 2009

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Learning Outcomes - Earlston High School

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9693 MARINE SCIENCE

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Population Ecology

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Fish Habitat Assemblage Data - Santa Clara Valley Habitat Agency

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The Intertidal Ecosystem

... 1. In your small group (3-4) make a quick sketch (on back of handout) of the study site showing the general landscape of your study area. Include i)the nature of the land immediately inland off the beach, ii)the types of substrate on the beach (rock, sand, mud etc) iii) any unique geological feature ...
Threatened Eiders of North America
Threatened Eiders of North America

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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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