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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Receding water levels hastenmetamorphosis in the frog,Sphaerotheca breviceps (Schneider,1799): a laboratory study
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Receding water levels hastenmetamorphosis in the frog,Sphaerotheca breviceps (Schneider,1799): a laboratory study

机译：青蛙体内的水位下降趋于变态（Sneerotheca breviceps，Schneider，1799）：一项实验室研究

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摘要

Gosner stage 19 tadpoles of Sphaerotheca brevicepswere exposed to constant or progressively decreasingwater levels until metamorphosis with abundant foodsupply. The tadpoles experiencing constant water levels(column height of 40 mm) reached metamorphic climax (MC) in 35.07 ± 0.44 days and metamorphosed at39.00 ± 0.43 days at a mean body mass of 409 ± 9.0 mgand 14.64 ± 0.08 mm snout-vent length. In contrast,the larvae experiencing decreasing water levels (from40 to 12 mm column height) reached MC in 30.93 ±0.35 days and metamorphosed at 34.73 ± 0.35 days ata significantly smaller body mass and size comparedto those reared in constant water levels. In both thetreatments survival of tadpoles was 100%. The studyreveals that S. breviceps tadpoles are capable of developmental plasticity and with progressive decrease inwater levels, the trade-off between growth and development is in favour of development, resulting in earlymetamorphosis at a small size.
机译：将Gosner阶段的19头of球菌暴露于恒定或逐渐降低的水位，直至变态，食物供应充足。 constant处于恒定水位（柱高为40 mm）的in在35.07±0.44天达到变质高潮（MC），并在39.00±0.43天变质，平均体重为409±9.0 mg，口鼻长度为14.64±0.08 mm 。相反，水位下降（从40 mm到12 mm的柱高）的幼虫在30.93±0.35天达到MC，并在34.73±0.35天变质，与在恒定水位下饲养的相比，它们的体重和大小明显减小。在两种治疗中，survival的存活率为100％。研究表明，S。breviceps ad具有发育可塑性，并且随着水位的逐渐降低，生长与发育之间的权衡有利于发育，从而导致了小规模的早期变态。

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