木の幹にジョロウグモが巣を作っていた。繭の中に卵があるのだろう。金曜の朝、見かけて、カメラを持って同じ場所に戻ったのは昼過ぎ、ずっと守っているつもりだろうか?派手なお母さんがいると却って目立つような気もするがアリはしっかり撃退していた。
もともと卵を包むための繭を作るために糸を作っていたのを、他の虫が引っかかるのに味をしめて木の間に張るように進化したのかなとうっすらと考えていた。図書館で蜘蛛の本を読むと、大体そう考えて間違いないようだ。
Jorou-gumo (Nephila clavata) Tetragnatidae
A nest of spider, probablly there are eggs inside. Found on friday morning, when I went back with camera around noon, it was still there, like how long is she going to protect it? The mother kind of attract attention with its conspicuous color, but I observed it at least drive away ants.
Probablly they originally produced thread for the protection of eggs, and learned that it can be used as a trap, and they started developping webs.
もともと卵を包むための繭を作るために糸を作っていたのを、他の虫が引っかかるのに味をしめて木の間に張るように進化したのかなとうっすらと考えていた。図書館で蜘蛛の本を読むと、大体そう考えて間違いないようだ。
Jorou-gumo (Nephila clavata) Tetragnatidae
A nest of spider, probablly there are eggs inside. Found on friday morning, when I went back with camera around noon, it was still there, like how long is she going to protect it? The mother kind of attract attention with its conspicuous color, but I observed it at least drive away ants.
Probablly they originally produced thread for the protection of eggs, and learned that it can be used as a trap, and they started developping webs.