Download
1 / 12
140 likes | 257 Vues
Interactions in Ecosystems. Birth of an Ecosystem. Surtsey Island, Iceland. http://www.youtube.com/watch?v=4MmX_i7S9u4. Ecosystem Interactions. Competition:. Is the interaction between two or more organisms competing for the same resource in a habitat.
E N D
Birth of an Ecosystem Surtsey Island, Iceland http://www.youtube.com/watch?v=4MmX_i7S9u4
Ecosystem Interactions Competition: Is the interaction between two or more organisms competing for the same resource in a habitat. Competition can happen between the same species. Example: Male mountain goat competing for the right to mate. Competition can happen between different species. Example: Raccoons and ravens can both feed on eggs from the same bird’s nest.
Ecosystem Interactions Occurs when one organism eats another organism to obtain food. What are some examples of the methods animals use to avoid predation? Chameleon – colour change to blend with surroundings Porcupine – throws needles Deer – can usually outrun a bear Predation
Types of Symbiosis Mutualism Commensalism Parasitism
Mutualism • In Mutualism both species benefit from the symbiotic partnership.
Commensalism • Commensalism occurs when one species benefits from a relationship and the other organism is neither harmed nor does it benefit in any way.
Parasitism • Parasitism occurs when one species benefits at the expense of another species. Parasites live on or inside the host and obtain some or all of the nutrition from the host.
Identify the type of Symbiotic Relationship. Commensalism Mutualism Parasitism
Ecosystem’s Carrying Capacity As a population grows, each individual gets a smaller share of the resources in the area. After a while, there are fewer births and more deaths. Eventually, the number of births equals the number of deaths. equilibrium is number of deaths in a population equal to the number of births. When this happens, the habitat is said to have reached its carrying capacity. Carrying capacity is the maximum number of individuals that an ecosystem can support.
Limiting Factors Examples of Abiotic Limiting Factors: Examples of Biotic Limiting Factors: • Amounts of: • sunlight • water • soil • air • storms Is an environmental factor that prevents an increase in the number of organisms in a population. • competition among organisms for resources • presence of predators • presence of disease-causing organisms.
