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首页> 外文期刊>Marine biology >Effects of ultraviolet radiation on different life cycle stages of the south Pacific kelps, Lessonia nigrescens and Lessonia trabeculata (Laminariales, Phaeophyceae)
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Effects of ultraviolet radiation on different life cycle stages of the south Pacific kelps, Lessonia nigrescens and Lessonia trabeculata (Laminariales, Phaeophyceae)

机译：紫外线辐射对南太平洋海带，黑海锦葵和小海棠（紫菜科，紫藻科）不同生命周期阶段的影响

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摘要

The effects of exposure to ultraviolet radiation (UVR), 280-400 nm, in different life histories and development stages of the kelps, Lessonia nigrescens and L. trabeculata, collected in the south-east Pacific coast (30°S) were evaluated in the laboratory. Germination and viability (motile zoospores, settled spores), diameter of the primary cell of the gametophytes, percentage of female gametophytes, fertility and sporophytes production were measured after exposure to three radiation treatments (PAR; PAR + UVA; PAR + UVA + UVB). The effects of UVR in young sporophytes (diploid stage) were evaluated as changes in maximal quantum yield of chlorophyll fluorescence of photosystem II (PSII) (F_v/F_m). A significant decrease in all variables was observed for the treatment that included UVB (PAR + UVA + UVB) after 2 and 4 h of exposure, in relation to the control. The motile spores were more sensitive to UVR exposure compared to settled spores and gametophytes, suggesting that along with an increase in ontogenetic development; there is an increase in the tolerance to UVR. In addition, it was observed that early stages of the intertidal L. nigrescens were more tolerant to UVR compared to the subtidal L. trabeculata. These results allow initially to infer that UVR may be regarded as an important environmental factor influencing the upper limit of distribution of these species, mainly through its detrimental effects on the early stages of the life cycle.
机译：评估了在东南太平洋海岸（30°S）收集的海藻，荷斯坦海藻和小叶小球藻的不同生活史和发育阶段中，暴露于280-400 nm紫外线下的影响。实验室。暴露于三种辐射处理（PAR； PAR + UVA； PAR + UVA + UVB）后，测量发芽和活力（运动的游动孢子，沉降的孢子），配子体原代细胞的直径，雌配子体的百分比，繁殖力和孢子体的产生。 。评估紫外线辐射对幼小孢子体（二倍体阶段）的影响，以光系统II（PSII）（F_v / F_m）叶绿素荧光的最大量子产率的变化来评估。相对于对照组，在暴露2h和4h后，对于包括UVB（PAR + UVA + UVB）在内的治疗，观察到所有变量的显着降低。与沉降的孢子和配子体相比，活动的孢子对UVR暴露更敏感，这表明随着个体发育的增加；对UVR的耐受性增加。此外，观察到，潮间带黑潮乳杆菌比潮间带小束乳杆菌更能耐受UVR。这些结果最初可以推断出UVR可能被视为影响这些物种分布上限的重要环境因素，主要是因为它对生命周期的早期阶段有不利影响。

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