| 词汇 | tadpole |
| 释义 | tadpole noun[ C ] uk /ˈtæd.pəʊl/ us /ˈtæd.poʊl/ a small, black creature with a large head and long tail that lives in water and develops into a frog or toad蝌蚪 Suntipab/ iStock/Getty Images Plus/GettyImages Animal young baby calf calves chick colt cygnet fawn foal fry gosling hatchling heifer joey litter offspring owlet peachick piglet poult spawn tadpole | American Dictionarytadpole noun[ C ] us/ˈtædˌpoʊl/ a recently born creature with a large head, long tail, and no arms or legs, which lives in water and develops into a frog or toad Examples of tadpoletadpole Anti-predator defence mechanisms may have evolved during the process that enabled these tadpole species to occupy large permanent streams, which often shelter predatory fishes. In sites where visibility was too poor for observation of tadpoles, such as areas with submerged aquatic vegetation, microhabitats were sampled with a small dipnet. Females construct underground nests, typically at the beginning of the rainy season before temporary ponds fill, in which they oviposit and attend eggs and tadpoles. Dendrobatids with terrestrial oviposition and subsequent parental tadpole transportation were continuously active. The role of adult anurans in choosing oviposition sites may also influence the distribution of tadpole species among streams. We investigated the correlation between calling activity, rainfall, temperature and water level in two ponds and recorded the occurrence of tadpoles of pond-breeding species. In the third axis, larger values indicate use of deeper microhabitats by tadpoles. Tadpoles were counted and the number of tadpoles per sweep calculated. Most ascidian species exhibit indirect development in which the egg develops into a tadpole larva. Eggs and tadpoles were reared to metamorphosis in buckets of stream water to confirm species identification. In this situation, oncomiracidia are available to infect tadpoles during the brief period of the rainy season. Pond tadpoles with generalized morphology: is it time to reconsider their functional roles in aquatic communities? This would imply indiscriminate use of available niche space by tadpoles, with no other factor limiting their distribution. They multiply enormously in the crop, undergoing a great change in appearance, being tadpole-like in form and having a crithidia-like arrangement of the nuclei. Freshly hatched tadpoles had a prominent yolk sac, the contents of which were rapidly used up during the first few days of development. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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