Nunca jogue truco com um carangueijo

Em Ciências da Vida @ 17.Nov.2008. por Carlos Hotta.

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Está olhando o quê?

Está olhando o quê?

Uma das coisas que eu mais gostava de fazer enquanto trabalhava na Ilha do Cardoso (SP) ficar observando carangueijos chama-maré andando pelas areias lamacentas do mangue. Estes carangueijos têm este nome porque possuem uma pinça gigantesca, que chamamos de quelas. Um comportamento comum destes carangueijos é ficar levantando e abaixando sua pinça, como se chamassem alguém (a maré, por exemplo).

Os chama-maré têm este comportamento como uma forma de defender o seu território. As fêmeas escolhem os seus parceiros pela sua toca. Por isso, as melhores tocas são as mais disputadas pelos machos. As disputas envolvem uma espécie de queda de braços usando suas pinças. No entanto, na maior parte das vezes tudo se resolve sem luta: os carangueijos evitam as lutas exibindo a sua pinça, tentando convencer o outro a nem tentar lutar. Assim como os humanos, quem se exibe melhor às vezes nem precisa mostrar que é melhor.

Uma conseqüência engraçada desse comportamento é que os carangueijos possuem pinças gigantescas, às vezes maior do que seu próprio corpo, pois esta é uma maneira de se ganhar as lutas sem ter que lutar. Lutas exigem energia e podem ferir, diminuindo as chances de um carangueijo se reproduzir. Por isso é melhor desistir de lutar com um carangueijo que parece ser muito melhor que você pois as conseqüência podem ser desfavoráveis demais.

Só que fazer pinças grandes também exige energia. Se já é difícil fazer uma pinça gigante, imagina ter que refazê-la se o carangueijo for atacado por um predador ou se machucar em uma luta? Daí vem a segunda conseqüência engraçada da exibição de pinças: quando um carangueijo perde sua pinça original, ele a regenera do mesmo tamanho mas sem a mesma força e habilidade. Ou seja: ele apenas finge ser um oponente difícil! O melhor é que o blefe vale a pena: estes carangueijos continuam as ganhar lutas que se restringem à exibição mas perdem sempre que têm que lutar!

Assim como os humanos, quem se exibe melhor nem sempre é o melhor.

Eu vou te pegar! Vem cá vem!

Eu vou te pegar! Vem cá vem!

Fotos: Wikipedia
Fonte: Science Daily, The Loom, Functional Ecology

UPDATE: acabei de encontrar dois vídeos interessantes. Um mostra uma luta brutal entre dois carangueijos e o outro o comportamento de exibição.

13 Comentários


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    Blog Mallmal
    em 17/ Nov/ 2008


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    O certo é “caranguejo”, sem o “i”.

    [Responda]

    Carlos Hotta Reply:


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    Eu debati comigo mesmo qual forma eu iria usar: a que eu vejo mais escrito por aí ou a que eu ouço mais falada… fiquei com o carangueijo mesmo que eu acho mais legal!

    [Responda]

    Igor Santos Reply:


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    Aff, esse povo que mora em lugar sem mangue..

    [Responda]


  2. Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method GA_Filter::comment_author_link() should not be called statically in /home/lablogatorios/lablogatorios.com.br/wp-includes/plugin.php on line 163
    Atila
    em 17/ Nov/ 2008


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    Não é que a pinça nova é falsa, é que eles compram no centro as pinças que vieram com defeito de fábrica e são mais baratinhas… vende lá no Brás ;)

    [Responda]


  3. Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method GA_Filter::comment_author_link() should not be called statically in /home/lablogatorios/lablogatorios.com.br/wp-includes/plugin.php on line 163

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    Igor Santos
    em 18/ Nov/ 2008


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    hehehehhehe

    [Responda]


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    Mau
    em 19/ Nov/ 2008


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    Interessante matéria, mas o autor precisa cuidar mais do português ou pelo menos passar um revisor no seu texto.
    CARANGUEJO é o correto… não existe a grafia carangueijo na língua portuguesa.

    [Responda]

    Carlos Hotta Reply:


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    Eu comentei logo acima que eu usei CARANGUEIJO de forma proposital.

    É para gerar a discussão paralela sobre ortografia: devemos corrigir a ortografia se o conteúdo não está sendo prejudicado?

    Devemos corrigir a ortografia se ela reflete melhor a pronúncia popular do que o considerado correto?

    [Responda]


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    Patola
    em 20/ Nov/ 2008


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    Devemos corrigir a ortografia se ela reflete melhor a pronúncia popular do que o considerado correto?

    Pergunta “fácil”, resposta cretina: na sua próxima redação, escreva “as árveres somos nozes” e veja o resultado.

    [Responda]

    Carlos Hotta Reply:


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    Bem… veja um texto qualquer de algumas décadas atrás. Você irá notar algumas diferenças ortográficas.

    Quem escreve errado: eles ou nós?

    Note que nenhuma destas alterações ortográficas viola a estrutura gramatical das frases, não impedindo assim, o seu entendimento.

    A língua está em constante evolução e ser muito contra estas mudanças é ir contra a maré.

    No fim, o critério que deve ser utilizado é: deu pra entender? A mensagem foi passada sem dano de conteúdo? No caso dos caranguejos/carangueijos, sim.

    [Responda]


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    Pauleta
    em 21/ Nov/ 2008


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    Tô com o Patola.

    [Responda]


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    Kim
    em 22/ Nov/ 2008


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    @duelo: dá quase pra ver a legenda “Vem pro pau, noob!”. Nossa, o bicho é rapido em fugir. Quem é o desafiante, o que fica de frente ou o que fica de lado©?

    Aliás, de lado©: sabe quando você sonha que está caindo e acorda subitamente, como se tivesse acabado de bater na cama? É assim que eu me sinto quando, lendo com concentração, me deparo com um erro ortográfico. Porém, é um pouco melhor quando há vários deles em seqüência.

    [Responda]


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    Diego Dubard
    em 22/ Nov/ 2008


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    Na verdade é um chié e não um caranguejo. Carne de chié só não é melhor que carne de aratu (um caranguejo vermelhão)

    [Responda]


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    Fulvio
    em 23/ Nov/ 2008


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    Esse caranguejo é que deveria ser o animal de estimação do Hellboy.

    [Responda]

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