Effects of constant and fluctuating temperatures on egg survival and hatchling traits in the northern grass lizard (Takydromus septentrionalis, Lacertidae).
Effects of constant and fluctuating temperatures on egg survival and hatchling traits in the northern grass lizard (Takydromus septentrionalis, Lacertidae).
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DOI：
10.1002/jez.a.243
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
W. Du;X. Ji
中科院分区：
文献类型：
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作者：
W. Du;X. Ji
为了了解巢穴温度如何影响爬行动物幼仔的表型特征，必须知道温度波动对幼仔特征的影响。然而，大多数研究只考虑了恒定温度的影响。我们在恒定温度（24℃、27℃、30℃和33℃）和波动温度下对七爪Takydromus septentrionalis （Lacertidae）卵进行孵育，以确定这些温度制度对孵育时间、孵化成功率和孵化性状（形态和运动性能）的影响。24°C和27°C的孵化成功率更高，这两个温度下孵化的雏鸟比30°C和33°C孵化的雏鸟更大，表现更好。在波动温度下孵化的蛋显示出惊人的高孵化成功率，尽管它们经历了极宽的温度范围（11.6-36.2°C），也能孵化出大而表现良好的雏鸟。这意味着卵子短时间暴露在不利的低温或高温下不会增加胚胎死亡率。在这种情况下，波动温度的变化对幼体形态和运动性能的影响比平均温度的影响更明显。随着温度波动的增加，雏鸟的头部大小和冲刺速度增加。这些结果表明，温度差异显著影响胚胎发育和孵化爬行动物的表型性状，因此具有生态学意义。
To understand how nest temperatures influence phenotypic traits of reptilian hatchlings, the effects of fluctuating temperature on hatchling traits must be known. Most investigations, however, have only considered the effects of constant temperatures. We incubated eggs of Takydromus septentrionalis (Lacertidae) at constant (24 degrees C, 27 degrees C, 30 degrees C and 33 degrees C) and fluctuating temperatures to determine the effects of these thermal regimes on incubation duration, hatching success and hatchling traits (morphology and locomotor performance). Hatching success at 24 degrees C and 27 degrees C was higher, and hatchlings derived from these two temperatures were larger and performed better than their counterparts from 30 degrees C and 33 degrees C. Eggs incubated at fluctuating temperatures exhibited surprisingly high hatching success and also produced large and well-performed hatchlings in spite of the extremely wide range of temperatures (11.6-36.2 degrees C) they experienced. This means that exposure of eggs to adversely low or high temperatures for short periods does not increase embryonic mortality. The variance of fluctuating temperatures affected hatchling morphology and locomotor performance more evidently than did the mean of the temperatures in this case. The head size and sprint speed of the hatchlings increased with increasing variances of fluctuating temperatures. These results suggest that thermal variances significantly affect embryonic development and phenotypic traits of hatchling reptiles and are therefore ecologically meaningful.