Variation in Clutch Size and Offspring Size Relative to Environmental Conditions in the Lizard Sceloporus virgatus
Variation in Clutch Size and Offspring Size Relative to Environmental Conditions in the Lizard Sceloporus virgatus
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蜥蜴 Sceloporus virgatus 的窝大小和后代大小相对于环境条件的变化
DOI：
10.2307/1565712
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发表时间：
1999
影响因子：
0.8
通讯作者：
Allison J. Abell
中科院分区：
文献类型：
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作者：
Allison J. Abell
雌性爬行动物的健康通常取决于后代的数量和大小。在水分和食物利用率自然变化和实验变化的条件下，我研究了条纹高原蜥蜴的产卵量(受精卵数量)和后代大小与母体大小的关系。在所有的环境条件下，体型较大的雌性会产生更多的后代。在降水水平较高的年份，通径分析表明，母体大小对后代大小有直接的正向影响，后代大小和数量之间存在显著的权衡。在严重干旱的一年里，也发现了类似的不明显的趋势。在干旱期间，雌性金龟子产下了相对较小的大型后代。在排卵前和排卵前的食物补充消除了干旱对窝卵大小和后代大小的影响。补充食物的雌性会产生相对较大的小后代。
Fitness of female reptiles often depends on both the number and size of offspring. I examined clutch size (number of fertile eggs) and offspring size relative to maternal body size in the striped plateau lizard, Sceloporus virgatus, under conditions of natural and experimental variation in water and food avail- ability. Under all environmental conditions, larger females produced more offspring. In the year with higher levels of precipitation, path analysis indicated a direct positive effect of maternal size on offspring size and a significant trade-off between offspring size and number. Similar nonsignificant trends were found in a year of severe drought. During the drought, females of S. virgatus produced relatively small clutches of large offspring. Food supplementation during the period preceding and including ovulation removed the effect of drought on clutch size and offspring size. Food-supplemented females produced relatively large clutches of small offspring.