'Same niche' diaporamas de présentation

CHAPTER 4

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What shapes an Ecosystem ?

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September 12, 2012

September 12, 2012. What is a density-dependent limiting factor? Give an example. What is a density-independent limiting factor? Give an example. September 13, 2012. What are the three types of symbiotic relationships? Give an example for each. Essential Question.

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Agenda 5/10

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Niches versus Neutrality

Niches versus Neutrality. Pennisi (2005, Science 309:93) 25 Most Important Questions in Science Include What explains species coexistence in diverse communities ?. Niche Differences. Self-Regulation Stronger than Interspecific Competition Stabilizes, Coexistence Ecologists

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Section 20-1 Species Interactions

Section 20-1 Species Interactions. Species Interactions. Various species within a community interact with each other in both positive and negative ways. One species might rely on another one for food, reproduction or nutrient cycling .

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What Shapes an Ecosystem?

What Shapes an Ecosystem?. Review of Biotic and Abiotic Factors. Ecosystems are influenced by a combination of biological and physical factors. Biotic factors include all the living things with which an organism might interact. Abiotic Factors

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ECOSYSTEMS

ECOSYSTEMS. Key Concepts . How do biotic & abiotic factors influence an ecosystem? What interactions occur within communities? What is ecological succession?. Abiotic vs. biotic. The biological influences on organisms within an ecosystem are called biotic factors.

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Community Interaction 14.2

Community Interaction 14.2. 14.2 Community Interactions. when organisms live together in an ecological community they interact constantly. Three types of interactions Competition Predation Symbiosis. Competition- competing for resources. occurs due to a limited number of resources

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Relationships in the Ecosystem

Relationships in the Ecosystem. What are the types of relationships?. Predator / Prey Competition Symbiosis A) commensalism B) mutualism C) parasitism. Predator / Prey. Predator = animal that hunts another animal for food. Prey = animal that is eaten by another.

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Speciation

Speciation. A species is an interbreeding group of organisms When a population is somehow severed from the parent population and over time its gene pool is altered. Allopatric and sympatric. Allopatric speciation. Isolation is the result of a geographic barrier Ex. Galapagos finches

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Population Biology

Population Biology. Under ideal conditions, populations will continue to grow at an increasing rate. The highest rate for any species is called its biotic potential. Classic examples : rabbits, yeast have a high biotic potential. What has a low biotic potential?.

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Convergent evolution examples

Convergent evolution examples. Endemic= native to an area. New Zealand has a high number of endemic species: 80% of all vascular plants 70% of all native terrestrial and freshwater birds All bats All native amphibians All reptiles 90% of freshwater fish.

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Laws of Nature

Laws of Nature. The Law of Gravity. Gravity is a force of attraction between objects that pulls all objects on earth towards the center of the earth at a rate of 9.8 m/sec Environmental Application Our Freshwater and pollution go to the same place; rivers, lakes, aquifers, the lowest point.

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Ecosystem Interactions and Ecological Succession

Ecosystem Interactions and Ecological Succession. V ocabulary . Adaptations Natural selections Commensalism Predator Secondary succession. Organism that kills another for food Process by which desirable characteristics become more common in species

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Community Interactions

Community Interactions. Community Interactions. Community: Many species interacting in the same environment Three types of interactions: Competition Predation Symbiosis. Competition. Defined : competing for resources water, nutrients, light, food

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The Concept Of Niche *

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Competitive Exclusion

Competitive Exclusion. Intraspecific Competition. Between individuals of the same species Example?. Interspecific Competition. Between two different species Can lead to competitive exclusion Occurs between 2 species in the same niche.

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1. Niche

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