Biosphere: layer of the planet where life exists. All the ecosystems on Earth. Biodiversity: the variety of life. LOSS OF BIODIVERSITY: Extinct: when every single member of a species dies and none are left alive. One example are dinosaurs. Endangered species: Those in danger of extinction. One example is the Iberian lynx. SOME CAUSES OF LOSS OF BIODIVERSITY ARE: WHAT CAN WE DO TO PRESERVE THE EARTH'S BIOSPHERE? -Respect the natural balanced of ecosystems -The three R's rule: Reduce, reuse and recycle. -Contribute to the creation of Natural parks and biosphere reserves. RELATIONSHIPS BETWEEN ORGANISMS OF THE SAME SPECIES: -Cooperative relationships: when organisms of the same species survive together. Family groups: stable groups in which the offspring are fed and cared for by the mothers or parents during the firsts years of life. Hierarchical communities: organisms that live in highly organised societies with specialised roles (workers, drones and the queen). Some examples are: ants, termites and bees. Gregarious species: animals that move, migrate or live in groups to protect themselves from predators. They form schools, flocks or herds. -Competitive relationships: when two males of the same species compete for a female. RELATIONSHIPS BETWEEN ORGANISMS OF DIFFERENT SPECIES: Predation: the relationship between a predator and a prey. Predator: animal that captures, kills and eats an organism of a different species Prey: animal that is captured, killed and eaten by a predator. Commensalism: relationship between two organisms that benefits one of them and doesn't harm of benefit the other. Mutualism: relationship between two organisms that benefits both of them. Parasitism: relationship between two organisms that benefits one of them and harms the other. Parasite: organism that depends on other organism to survive, causing harm. Host: organism the parasite depends on that is harmed.
WHO EATS WHO? Food chain: one linear sequence of who eats whom between organisms of one ecosystem. Food web: the natural interconnection of food chains in an ecosystem. ![]() Comments are closed.
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May 2017
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