Coconut crab resource management based on male size-dependent reproductive potentials

椰子蟹资源的收获模式是性别和体型偏倚的，主要捕获较大的雄蟹（胸长40 mm）。采收种群性别比明显向雌性倾斜，雄性平均体型减小。因此，留下来的小雄性可能比未收获的种群有更多的交配机会。然而，椰子蟹的雄性生殖潜力（例如与雌性交配和/或使雌性卵子受精的能力）完全取决于体型。因此，雌性的精子供应不足，无法使其所有的卵子受精，并且在收获的种群中遇到潜在配偶（体型较大的雄性）的概率降低，从而导致收获的种群的繁殖率可能降低。因此，建议采用限定槽位大小的纯雄采收作为有效的管理措施。

The harvesting pattern for coconut crab resource was sex- and body size-biased, in which larger males (>40 mm thoracic length) were exclusively taken. Sex ratio was skewed significantly toward females and mean male size decreased in the harvested population. Thus, small males that are left are likely to experience more matings than in non-harvested populations. However, coconut crab male reproductive potentials (e.g. ability to mate with female and/or to fertilize female ova) are definitively body size dependent. Therefore, females would suffer from insufficient sperm supply to fertilize all their eggs and decease in probability of encountering potential mates (larger males) in the harvested population, resulting in the reproductive rate of the harvested population is likely to decrease. Therefore, we recommend male-only harvesting with slot size limits as an effective management measure for coconut crabs.