Narrow range of temperature and irradiance supports optimal development of Lessonia corrugata (Ochrophyta) gametophytes: implications for kelp aquaculture and responses to climate change
Narrow range of temperature and irradiance supports optimal development of Lessonia corrugata (Ochrophyta) gametophytes: implications for kelp aquaculture and responses to climate change
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DOI：
10.1007/s10811-021-02382-7
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发表时间：
2021-02
影响因子：
3.3
通讯作者：
Ellie R. Paine;M. Schmid;J. Gaitán‐Espitia;Joshua Castle;I. Jameson;J. C. Sanderson;C. Hurd
中科院分区：
文献类型：
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作者：
Ellie R. Paine;M. Schmid;J. Gaitán‐Espitia;Joshua Castle;I. Jameson;J. C. Sanderson;C. Hurd
正在为澳大利亚塔斯马尼亚州鲑鱼笼附近的综合多营养水产养殖（IMTA）试验开发波纹kelpLessonia （Ochrophyta, Laminariales）。配子体在播种前在孵化线上进行植物性维持；然而，生长和性发育的最佳温度和光照条件尚不清楚。我们使用温度梯度表和中性密度滤光片测量了不同温度和光照下雌、雄配子体的营养大小和雌配子体的性发育。在为期4周的实验中，将配子体暴露在温度（5.7-24.9°C）和光照（10-100 μmol光子m−2s−1）梯度下，以评估生物性能。在极端温度（最高24.9°C，最冷5.7°C）下，我们观察到了该物种生长和性发育的临界温度极限，结果表明，在15.7 ~ 17.9°C之间的较窄温度范围内，在40 ~ 100 μmol光子m−2s−1之间的辐照度可以产生可育的雌性配子体。波状藻生长在一个很小的地理范围内，仅在澳大利亚大陆南部的塔斯马尼亚岛附近发现，因此海洋的变化，如海面温度（SSTs）的持续升高，以及辐射状态的改变，可能会限制未来早期微观生命阶段的补充。我们的研究结果为水产养殖提供了优化的养殖条件，并为预测l的未来地理范围提供了信息。海洋全球变化下的波纹。
The kelpLessonia corrugata(Ochrophyta, Laminariales) is being developed for integrated multi-trophic aquaculture (IMTA) trials in the vicinity of salmon cages in Tasmania, Australia. Gametophytes are vegetally maintained before seeding on hatchery twine; however, the optimal temperature and light conditions for growth and sexual development are unknown. We measured vegetative size of female and male gametophytes and sexual development of females over a range of temperatures and irradiances using a temperature gradient table and neutral density light filters. Over a 4-week experiment, gametophytes were exposed to a combination of thermal (5.7–24.9 °C) and irradiance (10–100 μmol photons m−2s−1) gradients, to assess biological performance. At the temperature extremes (hottest = 24.9 °C, coldest = 5.7 °C), we observed the critical thermal limits for this species and the results reveal a narrow optimal temperature range for growth and sexual development between 15.7 and 17.9 °C, with irradiances between 40 and 100 μmol photons m−2s−1resulting in fertile female gametophytes.Lessonia corrugatainhabits a small geographic range, found only around Tasmania, south of the Australian mainland, hence oceanic changes such as ongoing increases in sea surface temperatures (SSTs), and altered irradiance regimes may limit recruitment of the early microscopic life stages in the future. Our findings provide optimised culture conditions for aquaculture and information to predict the future geographic range ofL. corrugataunder ocean global change.