Instituto Ciencias Marinas y Limnológicas, Universidad Austral de Chile, Valdivia, Chile.
Centro i~mar, Universidad de Los Lagos, casilla 557, Puerto Montt, Chile.
Mar Environ Res. 2021 Jul;169:105353. doi: 10.1016/j.marenvres.2021.105353. Epub 2021 May 12.
Encapsulated development with extraembryonic yolk may lead to competition for nutrients within egg capsules. In this research, different degrees of competition among embryos in subtidal egg capsules of Acanthina monodon resulted in considerable differences in hatching size. For newly hatched juveniles, individuals hatching from less crowded egg capsules showed better survival, larger SL, higher rates of oxygen consumption, and higher rates of food consumption. However, by 28 days after hatching, the largest surviving juveniles were the best-performing individuals, regardless of the initial embryo density within the capsules. In summary, more crowded egg capsules resulted in poorer survival. These findings may help to explain the variability seen in juvenile success in some field populations; much of that variation may reflect stressful experiences that the new recruits have had during the early stages of their encapsulated development.
卵黄外膜包裹的发育可能会导致卵囊中胚胎之间对营养物质的竞争。在这项研究中，在南美白对虾亚潮间带卵囊中的胚胎竞争程度不同，导致孵化大小有很大差异。对于刚孵化的幼体，从拥挤程度较低的卵囊中孵化的个体表现出更好的存活率、更大的 SL、更高的耗氧率和更高的摄食率。然而，在孵化后 28 天，最大的幸存幼体是表现最好的个体，而不管卵囊中初始胚胎密度如何。总之，卵囊越拥挤，存活率越低。这些发现可能有助于解释在一些野外种群中观察到的幼体成功的可变性；这种变异性很大程度上可能反映了新个体在卵囊包裹发育的早期阶段所经历的压力。
