bioma brasileiro
TRANSCRIPT
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Nome Barbara Cristina
Nome Emilly martiins
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De origem grega, a palavra bioma (bio = vida +
oma = grupo) foi utilizada pela primeira vez nos
anos 1940 por Frederic Clements para designar
grandes unidades caracterizadas pela
uniformidade na distribuição e predomínio de
espécies de flora e fauna, associadas a relevo,
solos e macroclimas. Mais tarde, a classificação
foi aprimorada, passando a designar grandes
unidades com características semelhantes no que
se refere à sua fisionomia, formas de vida,
estruturas e fatores ambientais associados -
clima, relevo, solos e hidrografia.
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Bioma Amazônia: Corresponde ao conjunto de
ecossistemas que formam a Bacia Amazônica.
Está presente em nove países da América Latina.
Além das florestas tropicais, sua paisagem
também é composta por mangues, cerrados,
várzeas, entre outros. No Brasil, encontra-se o
núcleo dessa paisagem, a hiléia amazônica, com
grande concentração de árvores de grande
porte, com até 50 metros de altura, tendo o rio
Amazonas como eixo que domina 300
quilômetros para cada lado do seu curso, que
ocupa 3,5 milhões de quilômetros quadrados.
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Imensa fachada florestal que surpreendeu os portugueses em sua chegada, as Matas Atlânticas guardavam segredos que aos poucos foram sendo revelados. Recobrindo originalmente de 12% a 15% do que veio a ser o território brasileiro, elas se distribuíam pela faixa litorânea do Rio Grande do Norte ao Rio Grande do Sul, avançando para áreas interiores e alcançando frações dos atuais Paraguai e Argentina, em uma área de aproximadamente 1,1 milhão de quilômetros quadrados.
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Os cerrados estão localizados basicamente no
Planalto Central do Brasil. Configurando o
que Aziz Ab´Saber denominou como domínio
morfoclimático, eles correspondem à
extensão de chapadões tropicais com
cerrados e matas-galeria. Há também
fragmentos de cerrado em Roraima, Amapá,
Amazonas, Minas Gerais, em estados do
Nordeste e no sul-sudeste do Brasil. Em sua
origem, o bioma recobria cerca de 2,1
milhões de quilômetros quadrados, ou 23% da
área total do território nacional.
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As tradicionais imagens da caatinga e do semiárido nordestino, com solos secos e rachados e plantas de pequeno porte, muitas vezes deixam de revelar a extrema complexidade e diversidade do bioma. Suas paisagens refletem um clima de forte insolação, temperaturas elevadas na maior parte do ano, solos pedregosos, chuvas escassas e irregulares, com secas periódicas. Parte dos rios é intermitente e sazonal; as exceções são os caudalosos Parnaíba e São Francisco.
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Chamado de Paraíso das Águas, o Pantanal matogrossense conforma a maior planície de inundação contínua do mundo, numa área de transição entre a floresta amazônica, o Planalto Central brasileiro e o Chaco boliviano. Com diversos ecossistemas aquáticos, semi-aquáticos e terrestres e vegetação predominantemente aberta, o que mais chama a atenção na região é seu regime de cheias, de novembro a fevereiro, em que as águas de mais de 4 mil km de rios da região transbordam e alagam a planície. No período da estiagem, com menos água, que chega de bacias adjacentes lentamente, os rios retornam ao seu leito, formando-se milhares de lagoas
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