Fluxodeenergiaecirculaodematrianosgoreti 110324094223-phpapp01
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Transcript of Fluxodeenergiaecirculaodematrianosgoreti 110324094223-phpapp01
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Fluxo de Energia e Circulação de Matéria
nos Ecossistemas
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Qual é a principal fonte de energia nos ecossistemas?
A principal fonte de energia é o Sol.
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Na fotossíntese, as plantas captam a energia luminosa do Sol e transformam-na em energia química
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Água e sais minerais
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O que é uma cadeia alimentar?Uma cadeia alimentar é uma sequência de organismos interligados por relações de alimentação.
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O que é uma teia alimentar?Uma teia alimentar é o conjunto de várias cadeias alimentares de um ecossistema interligadas entre si.
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Apenas 10% da energia do nível trófico anterior passa para o seguinte dissipando-se outros 90% essencialmente na forma de calor. Cada seta entre níveis tróficos representa a transferência de energia e matéria, por isso o seu sentido.
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A fonte de energia dos ecossistemas é o Sol.
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São seres vivos que produzem matéria orgânica a partir da matéria mineral.
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A imagem representa uma cadeia alimentar
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Esta cadeia alimentar tem 3 níveis tróficos.
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O coelho ocupa o segundo nível trófico (consumidor primário).
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O lobo ocupa o terceiro nível trófico (consumidor secundário).
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São os decompositores.
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São seres vivos que não produzem matéria orgânica e por isso precisam de se alimentar de outros seres vivos.
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Uma teia alimentar é o conjunto de várias cadeias alimentares de um ecossistema interligadas entre si.
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A energia química obtida por um animal na sua alimentação é usada para no crescimento, na respiração e em todas as actividades realizadas. Assim, grande parte da energia contida nos alimentos perde-se para o ambiente.