Abstract In a very dry year, when aquatic habitats were scarce, we observed exceptionally massive corixid oviposition on terrapin shells in Doñana National Park, southwestern Spain. Most terrapins inhabiting a large pond devoid of aquatic vegetation exhibited a dense cover of corixid eggs, whilst terrapins from vegetated ponds had no egg cover. Corixid oviposition had also been observed on terrapin shells in previous periods of severe drought. Considering that terrapins frequently alternate between aquatic and terrestrial environments, we experimentally assessed the viability of corixid eggs in varying degrees of dry-exposure. A significant proportion of corixid eggs did not hatch when they were occasionally dried under sun exposure, but egg mortality was lower when they were dried in the shade. The massive oviposition on terrapin shells was probably a consequence of the limited availability of adequate oviposition sites, and it might increase the odds of egg survival when terrapins migrate to other ponds.

中文翻译：

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移动中的卵团：龟甲壳上的corixid产卵

摘要 在一个非常干燥的年份，当水生栖息地稀缺时，我们在西班牙西南部的多尼亚纳国家公园观察到在龟壳上异常大量的corixid 产卵。大多数栖息在没有水生植被的大池塘中的水龟表现出密集的珊瑚蛋覆盖，而来自植被池塘的水龟没有蛋覆盖。在之前的严重干旱时期，也曾在龟甲上观察到 Corixid 产卵。考虑到水龟经常在水生和陆地环境之间交替，我们通过实验评估了珊瑚卵在不同程度的干燥暴露下的生存能力。当它们偶尔在阳光下晒干时，很大比例的corixid卵没有孵化，但在阴凉处晒干时，鸡蛋死亡率较低。