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The Influence of Maternal Size on the Eggs and Hatchlings of Loggerhead Sea Turtles

机译：母体大小对Log海龟卵和孵化的影响

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Our study examined variation in and correlation of reproductive traits for a population of Caretta caretta (Loggerhead Sea Turtle) nesting in Georgia and compared the results with those of other studies. We assessed variability in reproductive traits (i.e., maternal length, clutch size, egg diameter, egg mass, hatchling length. and hatchling mass) on the population level and individual level. At the population level, we investigated interannual and intraseasonal variation of these traits for 810 Loggerhead Sea Turtle nests in Georgia, on Wassaw National Wildlife Refuge (NWR) and Blackbeard Island NWR during 2000-2003 and 2001-2003, respectively. As the nesting season progressed, we observed a decrease in clutch size, mean egg diameter, mean egg mass per clutch, mean hatchling length per clutch, and mean hatchling mass per clutch. Further, we measured all previously mentioned traits on a subset of the female turtles encountered on the beach (n = 24) and used these data to examine the variability of the traits on the individual level. Generalized linear modeling using this more refined individual-level data set indicated that 55% of the variability in clutch size was explained by a combination of maternal length (47%) and hatchling length (8%). This model suggested that clutch size was positively related with maternal length (t = 4.79) and negatively related with hatchling length (t = -1.90). Greater maternal length resulted in larger clutch size, but not larger egg size; thus, egg size was relatively constant irrespective of maternal length. These results support optimal egg-size theory, indicating a trade-off between clutch size and hatchling size to produce the optimum maternal investment per offspring.
机译：我们的研究检查了佐治亚州的etta（Caretta caretta，Loggerhead Sea Turtle）筑巢种群的繁殖性状的变异和相关性，并将其与其他研究的结果进行了比较。我们评估了人口水平和个体水平上生殖性状的变异性（即母体长度，离合器大小，卵径，卵重，孵化长度和孵化量）。在种群水平上，我们调查了2000-2003年和2001-2003年分别在Wassaw国家野生动物保护区（NWR）和黑胡子岛NWR上的佐治亚州810个Log海龟巢的性状的年际和季节内变化。随着筑巢季节的进行，我们观察到离合器尺寸，平均卵直径，平均每个离合器的卵质量，平均每个离合器的孵化长度和平均每个孵化质量的减少。此外，我们在海滩上遇到的雌性海龟的一个子集（n = 24）上测量了所有先前提到的性状，并使用这些数据检查了个体水平上性状的变异性。使用此更精确的个体水平数据集的广义线性建模表明，产妇长度（47％）和孵化期长度（8％）的组合可以解释离合器尺寸变化的55％。该模型表明离合器的大小与产妇的长度呈正相关（t = 4.79），与孵化的长度呈负相关（t = -1.90）。较大的产妇长度导致较大的离体大小，但卵较大。因此，无论产妇的身高如何，卵子的大小都相对恒定。这些结果支持最佳卵子大小理论，表明在离合器大小和孵化大小之间进行权衡以产生每个后代最佳的母体投资。

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