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Achigã: uma invasão biológica

Martim Cunha

Created on March 16, 2026

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Transcript

Ciências Naturais

Achigã: uma invasão biológica

Estudo de caso sobre o peixe Achigã.

Martim, Matilde Fernandes, Diogo, Luana

Introdução:

O peixe achigã (micropterus salmoides) é um peixe predador de água doce que foi introduzido em portugal para a pesca desportiva, adaptando- se muito bem ao ecosistema alimantando- se dos peixes nativos maioritariamente no sul do Tejo.

Características:
  • Alimenta- se de outros peixes, insetos e pequeno animais.
  • Pode crescer bastante.
  • É muito usado na pesca desportiva.

Indície:

1.

Introdução

2. Ecossistema

3. Caracterização

4. Perturbação

5. Causas

6. Consequências

7. Soluções 8. Conclusão 9. Blibiografia

oRIGEM DO aCHIGÃ:

O achigã é originário da América do Norte. Esta espécie foi introduzida em muitos países incluindo Portugal. Cujo intereses são: pesca desportiva, interesse económico e gestão de recursos piscícolas. Quando é introduzido noutros ecossistemas, pode tornar-se uma espécie invasora.

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Tipo de Perturbação Antrópica (causada pelo ser humano) O que aconteceu? Introdução do achigã fora do seu habitat natural Objetivo: Pesca desportiva Interesse económico e recreativo

Descrição da Perturbação

Causas

Causas: Introdução intencional por humanos Falta de controlo ecológico Ausência de predadores naturais Elevada capacidade de adaptação do achigã Reprodução rápida

ConsequÊncias ambientais

'Consequências AmbientaisPredação de espécies nativas Diminuição da biodiversidade Alteração das cadeias alimentares Competição por alimento Possível extinção local de espécies 👉 No Japão: O achigã tornou-se uma das espécies invasoras mais problemáticas 👉 Em Portugal: Afeta populações de peixes autóctones

CosequÊncias sociais

Alteração das atividades tradicionais de pesca Conflito entre pescadores desportivos e ambientais Mudança na perceção da biodiversidade

Consequências Económicas

Benefícios: Turismo de pesca desportiva Prejuízos: Custos de controlo da espécie Perda de espécies com valor económico tradicional

Cosequências económicas

Benefícios: Turismo de pesca desportiva Prejuízos: Custos de controlo da espécie Perda de espécies com valor económico tradicional

Propostas de solução

Controlo da população de achigã Proibição da introdução de espécies exóticas Educação ambiental Proteção de espécies nativas Monitorização dos ecossistemas Programas de conservação 👉 No Japão: Campanhas para remoção do achigã 👉 Em Portugal: Regulamentação da pesca

Conclusão

O achigã é um exemplo claro de desequilíbrio ecológico causado pelo ser humanoApesar dos benefícios económicos, os impactos ambientais são significativos É essencial adotar medidas sustentáveis para proteger os ecossistemas A preservação da biodiversidade deve ser uma prioridade

Bibliografia:

(Sugestões de fontes fiáveis) ICNF (Instituto da Conservação da Natureza e das Florestas) Agência Portuguesa do Ambiente WWF Artigos científicos sobre espécies invasoras Relatórios ambientais do Japão

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With Genially's templates, you can include visual resources to leave your audience amazed. Also, highlight a specific phrase or data that remains engraved in the memory of your audience, and even embed external content that surprises: videos, photos, audios... Whatever you want!

a great title here

With Genially's templates, you can include visual resources to leave your audience amazed. Also, highlight a specific phrase or data that remains engraved in the memory of your audience, and even embed external content that surprises: videos, photos, audios... Whatever you want!

a great title here

With Genially's templates, you can include visual resources to leave your audience amazed. Also, highlight a specific phrase or data that remains etched in fire in the memory of your audience and even embed external content that surprises: videos, photos, audios... Whatever you want!

an awesome title here

With Genially's templates, you can include visual resources to leave your audience amazed. You can also highlight a specific phrase or data that remains engraved in the memory of your audience and even embed external content that surprises: videos, photos, audios... Whatever you want!

a great title here

With Genially's templates, you can include visual resources to leave your audience amazed. Also, highlight a specific phrase or data that remains engraved in the memory of your audience and even embed external content that surprises: videos, photos, audios... Whatever you want!

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With Genially's templates, you can include visual resources to leave your audience amazed. Also, highlight a specific phrase or data that remains engraved in fire in the memory of your audience and even embed external content that surprises: videos, photos, audios... Whatever you want!

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O achigã em PORTUGAL:

O achigã foi introduzido em Portugal no século XX.O objetivo principal foi desenvolver a pesca desportiva, porque é um peixe muito apreciado pelos pescadores. Hoje está muito presente em muitas albufeiras , rios e barragens do país.

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