DIFFERENCES IN BODY SIZE AMONG CHUCKWALLA (SAUROMALUS OBESUS) POPULATIONS
DIFFERENCES IN BODY SIZE AMONG CHUCKWALLA (SAUROMALUS OBESUS) POPULATIONS
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Chuckwalla (SAUROMALUS OBESUS) 种群之间体型的差异
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
C. Tracy
中科院分区：
文献类型：
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作者：
C. Tracy
我提出了少年chuckwallas（Sauromalus obesus;鬣蜥科），收集了六个不同的人口在相同的条件下，在实验室共同花园实验。这个实验允许从环境原因中分离出在不同种群中发现的成年体型差异的遗传原因。来自不同家庭种群的Chuckwallas在大小和生长模式上表现出遗传差异。成年个体小的种群比成年个体大的种群的落叶松成熟前生长快，成熟后生长慢。大小和增长率与海拔之间的网站chuckwallas在实验室和自然种群。例如，在低海拔地区，Chuckwallas生长相对较快，在较短的生长季节内达到成熟。在这些炎热干燥的地方，干旱的频率很高，可能需要在成熟后储存能量，作为对下一年粮食有限的相对高概率的缓冲。然而，在海拔较高的地方，蜥蜴不受这种限制，允许它们使用能量来生长，以达到更大的尺寸，从而产生更大的离合器。虽然野生植物物种多样性随着海拔的增加而增加，但以一年生植物地上生物量衡量的食物丰富度却没有增加。这表明，食物可获得的时间长度，而不是它的丰富程度，是最重要的chuckwallas。
I raised juvenile chuckwallas (Sauromalus obesus; Iguanidae) that were collected from six different populations under identical conditions in a laboratory common-garden experiment. This experiment allows partitioning of genetic causes from environmental causes of the differences in adult size found in different populations. Chuckwallas from different home populations showed what appear to be genetic differences in size and patterns of growth. Lizards from populations with small adults grew faster before maturity and slower after maturity than those from populations with larger adults. Size and growth rates were correlated with elevation among sites for chuckwallas both raised in the laboratory and in natural populations. For example, at low-elevation sites, chuckwallas grew comparatively rapidly to reach maturity in a shortened growing season. A high frequency of drought at these hot, dry sites may necessitate storage of energy after maturity as a buffer against the relatively high probability that food will be limited in the following year. Lizards at higher elevation sites, however, are freed from this constraint, allowing them to use energy for growth to reach larger size and therefore to produce larger clutches. Although plant species diversity in the wild showed an increase with increasing elevation, food abundance, measured as the aboveground biomass of annuals, did not. This indicates that the length of time food is available, rather than its abundance, is of primary importance to chuckwallas.