Maternal effects associated with gestation conditions in a viviparous lizard, Niveoscincus metallicus

IF 1.1 2区 生物学 Q3 ZOOLOGY Herpetological Monographs Pub Date : 2000-01-01 DOI:10.2307/1467056
R. Swain, Sandra C. Jones
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引用次数: 59

Abstract

Viviparous squamates offer opportunities for exploring the importance of past maternal resources (yolk) and current resources (placentotrophy) to support embryonic growth during gestation, and to optimize offspring fitness. Both thermal and nutritional environment of the mother during gestation may be expected to be important in determining offspring fitness. Using a two-way factorial design, we have investigated possible interactions between food intake and thermal environment during gestation in the viviparous skink Niveoscincus metallicus . Among the females given restricted basking opportunities, fewer females gave birth, there was a significant increase in gestation length, and relative clutch mass was reduced due to smaller neonatal size; none of these parameters were influenced by nutritional status. Neonates from mothers given restricted basking opportunities were lighter, had shorter snout-vent lengths (SVL), and smaller fat bodies than neonates from mothers given optimal basking opportunities; their postnatal growth rate (over eight weeks) was also significantly lower and they showed a reduced incidence of basking behavior. There were interaction effects between thermal regime and food supply for neonate SVL and neonatal fat body weight. Sprint speed within 24 hours of birth was significantly increased in neonates from mothers given restricted thermal opportunities; however, for weeks 1-8 postnatally, there were no differences in sprint speed in offspring from any of the treatments. These results suggest that, contrary to our initial hypothesis, females maintained in nutritionally favorable conditions are unable to compensate for the gestational effects of a thermally poor environment. We now suggest that in Niveoscincus metallicus facultative placentotrophy may allow mothers to improve offspring fitness by increasing neonatal fat body size.
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一种胎生蜥蜴的母体效应与妊娠条件有关
胎生鳞片为探索过去母体资源(卵黄)和当前资源(胎盘保护)在妊娠期间支持胚胎生长和优化后代适应性的重要性提供了机会。在怀孕期间,母亲的热环境和营养环境都可能是决定后代健康的重要因素。采用双向因子设计,研究了金属Niveoscincus metallicus胎生蜥蜴妊娠期间食物摄取量与热环境之间可能的相互作用。在日照机会有限的雌性中,产仔数量较少,妊娠期明显增加,相对窝重因幼崽体积较小而减少;这些参数均不受营养状况的影响。与给予最佳晒太阳机会的母亲所生的婴儿相比,给予有限晒太阳机会的母亲所生的婴儿体重更轻,鼻口长度(SVL)更短,脂肪体更小;它们的出生后生长率(超过八周)也显著降低,它们的晒太阳行为也减少了。热环境与食物供给对新生儿SVL和新生儿脂肪体质量有交互作用。婴儿出生后24小时内的冲刺速度明显增加;然而,在出生后1-8周内,任何处理的后代在短跑速度上都没有差异。这些结果表明,与我们最初的假设相反,维持在营养有利条件下的雌性无法补偿热环境对妊娠的影响。我们现在认为,在Niveoscincus metallicus中,兼性胎盘战利品可能允许母亲通过增加新生儿脂肪体大小来改善后代的健康。
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来源期刊
Herpetological Monographs
Herpetological Monographs 生物-动物学
CiteScore
5.40
自引率
0.00%
发文量
2
审稿时长
>12 weeks
期刊介绍: Since 1982, Herpetological Monographs has been dedicated to original research about the biology, diversity, systematics and evolution of amphibians and reptiles. Herpetological Monographs is published annually as a supplement to Herpetologica and contains long research papers, manuscripts and special symposia that synthesize the latest scientific discoveries.
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