Hyposaline conditions impact the early life-stages of commercially important high-latitude kelp species

IF 2.8 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Veronica Farrugia Drakard, Jordan A. Hollarsmith, Michael S. Stekoll
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引用次数: 0

Abstract

This study examines how hyposaline stress impacts the early life-stages of commercial kelp species from Alaska. Kelp are important species both ecologically and commercially and are likely to experience significant impacts due to ongoing climate change. Climate-driven glacial melt and changing rainfall patterns globally will release large amounts of freshwater into coastal systems in the coming decades. Both bull kelp (Nereocystis luetkeana) and ribbon kelp (Alaria marginata) are high-latitude species of commercial and ecological importance. These species inhabit very different environments: While bull kelp is a subtidal, canopy-forming species, ribbon kelp is an intertidal subcanopy species. In this study, fertile specimens of both were collected from various locations in Alaska and induced to release spores. These were cultivated for 30 days in four salinity treatments: 32, 25, 20, and 13. Both species grew and produced gametophytes in salinities down to a salinity of 20, although A. marginata seems to be better adapted to hyposaline conditions. Below a salinity of 20, we observed several impacts on progression between life stages. The response of gametophyte growth and the production of eggs and sporophytes to different salinities varied both by species and by population. Gametophytes of N. luetkeana grew fastest at a salinity of 32, while those of A. marginata grew fastest between 20 and 25 (Juneau) or 25 and 32 (Kodiak). In terms of egg production, A. marginata displayed significant population-level variation. Juneau individuals produced the same number of eggs regardless of salinity. Kodiak individuals produced fewer eggs in hyposaline conditions. The production of sporophytes from eggs for both species from all locations was unaffected by salinities above 20; however, no sporophytes at all were produced at 13. All of this has implications for commercial production in the hatchery phase, as hyposaline stress may induce N. luetkeana to produce sporophytes faster than in full oceanic salinity. In terms of wild populations, the observed population-level and species-level differences in adaptation to hyposaline conditions suggest that decreased salinities in coastal areas are likely to impact the distribution of these two species over the coming decades.

低盐条件影响了具有重要商业价值的高纬度海藻物种的早期生命阶段。
本研究探讨了低肾上腺素压力如何影响阿拉斯加商业海带物种的早期生命阶段。海带在生态和商业上都是重要的物种,由于持续的气候变化,海带可能会受到重大影响。在未来几十年里,气候驱动的冰川融化和全球降雨模式的变化将向沿海系统释放大量淡水。牛海带(Nereocystis luetkeana)和带状海带(Alaria marginata)都是高纬度地区具有商业和生态重要性的物种。这些物种生活在非常不同的环境中:牛海带是一种潮下树冠形成物种,而带状海带是一种潮间带树冠亚物种。在这项研究中,从阿拉斯加的不同地点收集了这两种植物的可育标本,并诱导其释放孢子。在4种盐度处理(32、25、20和13)下培养30天。这两个物种在盐度低至20的盐度下都能生长和产生配子体,尽管边缘拟南芥似乎更适应低盐条件。在盐度低于20的情况下,我们观察到生命阶段之间的发展受到了一些影响。配子体的生长、卵和孢子体的产生对不同盐度的响应随种群和物种的不同而不同。黄杨配子体在盐度为32时生长最快,朱诺的配子体在盐度为20 ~ 25或科迪亚克的配子体在盐度为25 ~ 32时生长最快。在产蛋量方面,边角田鸡在种群水平上存在显著差异。无论盐度如何,朱诺的个体都能产生相同数量的卵。科迪亚克个体在低肾上腺素条件下产卵较少。所有地点的两种卵孢子体的产生不受盐度高于20的影响;然而,在13时完全不产生孢子体。所有这些都对孵化期的商业生产有影响,因为低盐胁迫可能会导致N. luetkeana比在全海洋盐度下更快地产生孢子体。就野生种群而言,观察到的种群水平和物种水平在适应低盐条件方面的差异表明,沿海地区盐度的下降可能会影响这两种物种在未来几十年的分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Phycology
Journal of Phycology 生物-海洋与淡水生物学
CiteScore
6.50
自引率
3.40%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, acquaculturist, systematist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems.
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