… However, it is rare for animals to eat only one type of food (monophagy), as is the case with herbivorous insects. They usually eat multiple types of organisms and are attacked by multiple types of animals (polyphagy or omnivory). Therefore, food chains in nature are rarely a single simple chain, but rather form a food web in which several food chains are intertwined. Figure 2 shows an example of a food chain in a river that is centered on fish, and it has been shown that food relationships can change depending on environmental factors. … *Some explanations of terms that mention "food web" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… しかし動物のうちで,植食性昆虫などに認められるようなただ1種の餌しか食わない(単食性)場合はまれであり,通常は複数種の生物を食い,また複数種の動物から攻撃される(多食性または雑食性)。したがって自然界において食物連鎖が単純な1本の鎖であることはほとんどなく,いくつかの食物連鎖がからみ合った食物連鎖網(または食物網food web)を形成する。図2に魚類を中心とした河川における食物連鎖の一例を示したが,環境要因によってもその食物関係が変化することが示されている。… ※「food web」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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