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首页> 外文期刊>Marine ecology progress series >Larval thermal windows in native and hybrid Pseudoboletia progeny (Echinoidea) as potential drivers of the hybridization zone
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Larval thermal windows in native and hybrid Pseudoboletia progeny (Echinoidea) as potential drivers of the hybridization zone

机译：天然和杂种假单胞菌后代（Echinoidea）中的幼虫热窗是杂交区的潜在驱动力

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摘要

For marine species that hybridize, the maintenance of separate lineages requires natural barriers that limit hybridization zones or species distributions in which hybrid progeny cannot survive across the entire range of the parent species. We examined this potential in the sea urchin species Pseudoboletia maculata and P. indiana, which have overlapping distributions in the Pacific and readily hybridize, yet have maintained separate lineages. We examined the role of developmental thermal windows in native and hybrid progeny reared across a temperature gradient (8 to 37 degrees C) to determine if post-zygotic processes restrict the environmental isotherm hybridization zone along the eastern Australian coastline. Native and hybrid progeny of Pseudoboletia from Sydney Harbour were reared to late pluteus larvae and scored for development at 3 time points (10, 24 and 48 h post fertilization) to determine the thermal limits for normal early development. While hybrid progeny developed equally well within their thermal windows and at ambient temperature (22 degrees C), they had thermal windows up to 10 degrees C narrower than those of the maternal lineage. The geographic ranges known for the benthic adults coincide with the thermal windows of their progeny. Hybrid progeny were less tolerant of the warmer conditions experienced by the Pseudoboletia species. This indicates that offspring fitness may limit hybridization in the tropical regions. Given the potential for the emergence of new hybridization zones as the oceans warm, our observations highlight the need for a greater understanding of the thermal biology of hybrid offspring when predicting future distributions and the potential for expansion of hybridization zones.
机译：对于杂交的海洋物种，维持单独的谱系需要天然的屏障，从而限制了杂交区或物种分布，在这些区域或物种分布中，杂交后代无法在整个亲本物种范围内生存。我们在海胆物种Pseudoboletia maculata和P.indiana中检查了这种潜力，这些物种在太平洋地区具有重叠分布并易于杂交，但保持着不同的谱系。我们研究了发育温度窗口在温度梯度（8至37摄氏度）下饲养的原生和杂交后代中的作用，以确定合子后过程是否限制了澳大利亚东部海岸线沿线的环境等温线杂交区。将来自悉尼港的假单胞菌的原生和杂种后代饲养到晚侧幼体，并在3个时间点（受精后10、24和48小时）对发育进行评分，以确定正常早期发育的热极限。尽管杂种后代在其热窗内和环境温度（22摄氏度）下均发育良好，但它们的热窗比母系谱系窄了10摄氏度。底栖成虫已知的地理范围与其后代的热窗一致。杂种后代对假单胞菌属物种经历的较温暖条件的耐受性较低。这表明后代的适应性可能会限制热带地区的杂交。考虑到随着海洋变暖可能出现新的杂交区的可能性，我们的观察结果突出了在预测未来的分布和杂交区扩展潜力时需要对杂交后代的热生物学特性有更深入的了解。

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