Aquatic Botany最新文献_第3页

Nutritional composition of forage resources consumed by Florida manatees (Trichechus manatus latirostris) vulnerable to seagrass decline in the Indian River Lagoon 印度河环礁湖海草退化对佛罗里达海牛所消耗的饲料资源营养组成的影响

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-26 DOI: 10.1016/j.aquabot.2025.103972

Aarin Conrad Allen , Danielle C. Sattelberger , Justin E. Campbell , Jeremy J. Kiszka

The Florida manatee (Trichechus manatus latirostris) is known to consume at least sixty species of aquatic macrophytes, but seagrass dominates their diet. In recent years, however, harmful algal blooms (HABs) have caused major seagrass declines, particularly in the Indian River Lagoon (IRL), Florida. Recent studies suggest that manatees in the IRL have undergone a significant dietary shift from a seagrass- to a macroalgae-dominated diet over the past ∼50 years. Therefore, there is a need to understand the nutritional and energetic consequences of such a dietary shift. This study compared the macronutrients carbon (C), nitrogen (N), and phosphorus (P), and proximate composition (acid detergent fiber [ADF], ash, crude fat, crude protein, total digestible nutrients [TDN], and total nonstructural carbohydrates [TNC]) of ten known forage items consumed by manatees in the IRL. Here, we aimed to: 1) quantify macronutrient and elemental stoichiometry (C:N:P) of items consumed by manatees, 2) evaluate the proximate composition of forage resources, and 3) investigate the seasonal (wet vs. dry) variation in macronutrient and proximate compositions. Results indicate that a macroalgae-rich diet provides readily digestible energy but contains significantly less fiber, and exhibits altered nutritional balances compared to seagrass. Such a dietary transition may compromise hindgut fermentation efficiency, disrupt symbiotic microbiota, and exacerbate malnutrition risks to manatees in Florida.

众所周知，佛罗里达海牛（Trichechus manatus latirostris）以至少60种水生植物为食，但海草是它们的主要食物。然而，近年来，有害的藻华（HABs）造成了海草的大量减少，特别是在佛罗里达州的印第安河泻湖（IRL）。最近的研究表明，在过去的约50 年里，IRL中的海牛经历了从海草到大型藻类为主的饮食的重大转变。因此，有必要了解这种饮食转变对营养和能量的影响。本研究比较了海牛食用的10种已知饲料的常量营养元素碳(C)、氮(N)、磷(P)和近似组成（酸性洗涤纤维[ADF]、灰分、粗脂肪、粗蛋白质、总可消化营养物质[TDN]和总非结构性碳水化合物[TNC]）。在此，我们的目标是：1)量化海牛所消耗的食物的宏量营养素和元素化学计量（C:N:P）， 2)评估饲料资源的近似组成，3)研究宏量营养素和近似组成的季节（湿和干）变化。结果表明，与海草相比，富含巨藻的饮食提供了易于消化的能量，但含有的纤维明显减少，并且营养平衡发生了变化。这种饮食转变可能会损害后肠发酵效率，破坏共生微生物群，并加剧佛罗里达海牛的营养不良风险。

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引用次数: 0

Posidonia bonsai: Dwarf morphotypes of Posidonia oceanica in CO2 vents and non-vents areas suggest a novel growth strategy Posidonia盆景：在CO2喷口和非喷口地区的Posidonia oceanica的矮化形态表明了一种新的生长策略

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-26 DOI: 10.1016/j.aquabot.2025.103981

Maria Cristina Gambi , Caterina Iacono , Antonino Miccio , Valentina Esposito , Gabriele Procaccini , Lazaro Marín-Guirao

Dwarf shoots of the Mediterranean seagrass Posidonia oceanica, referred to as “Posidonia bonsai”, described in shallow hydrothermal vents, showed markedly reduced size and altered phenology, that were attributed to the extreme environmental conditions associated with ocean acidification and H₂S emissions of these vent systems. Here we report new records of Posidonia “bonsai” from CO₂ vent off the Ischia Island and non-vent areas with normal pH conditions at Ischia, and Ustica islands and at Palinuro. At Ustica and Palinuro, bonsai shoots we found exclusively on rocky bottoms, while at Ischia they occurred on the dead P. oceanica matte, both within vent systems and in control areas. Bonsai shoots exhibited a reduced number of leaves, significantly shorter leaf length and width, resulting in a drastic reduction of total leaf surface area (84–95 % lower) and biomass (82–97 % lower) compared to nearby regular-sized shoots. In addition, bonsai shoots lacked the typical annual cycle of leaf sheath thickness observed in normal shoots (lepidochronological cycle), as previously observed in bonsai from other sites. The high number of sheaths recorded per rhizome length, suggests high leaf production and turnover. The occurrence of bonsai shoots on dead matte at the meadow margins and in small clearings, or behind regular terminal shoots on creeping rhizomes in hard bottoms, leads to hypothesize that Posidonia bonsai represents a novel growth and colonization strategy, probably trigged by stressful conditions, not limited to ocean acidification, and point out the remarkable phenotypic plasticity of this seagrass.

地中海海草Posidonia oceanica的矮芽，被称为“Posidonia盆景”，在浅层热液喷口中被描述，显示出明显缩小的尺寸和改变的物候，这是由于与海洋酸化和这些喷口系统的H2S排放相关的极端环境条件。本文报道了在Ischia岛CO2喷口和Ischia岛、Ustica岛和Palinuro岛pH值正常的非喷口地区发现的Posidonia“盆景”新记录。在乌斯提卡和帕利努罗，我们只在岩石底部发现盆景苗，而在伊斯基亚，它们出现在海底喷口系统和控制区内死去的大洋蕨上。盆景苗的叶数减少，叶长和叶宽明显缩短，导致总叶表面积（降低84 - 95% %）和生物量（降低82 - 97% %）显著减少。此外，盆栽嫩枝缺乏正常嫩枝叶鞘厚度的典型年周期（鳞翅果年代学周期），而以往在其他地点的盆栽中观察到这一点。每根茎长度记录的高鞘数表明叶片产量和周转率高。盆景幼芽出现在草甸边缘和小间隙的枯死地面上，或在硬底匍匐根茎上的规则末端幼芽后面，导致假设Posidonia盆景代表了一种新的生长和定植策略，可能是由压力条件触发的，而不限于海洋酸化，并指出了这种海草显着的表型可塑性。

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引用次数: 0

Phenotypic and genetic variation of Najas marina and Najas major in the south-eastern Baltic region 波罗的海东南部地区marina和major Najas的表型和遗传变异

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-20 DOI: 10.1016/j.aquabot.2025.103971

L. Kamaitytė-Bukelskienė , Z. Sinkevičienė , D. Naugžemys , J. Butkuvienė

The present study examined the phenotypic and genetic differences between Najas marina L. s.s. and Najas major All. in the south-eastern Baltic region, testing reliable diagnostic markers. The key questions included species distribution patterns, the most distinctive morphological traits, the impact of ecological conditions on morphology, and the effectiveness of ISSR markers in evaluating genetic diversity and structure. The results were contrasted with those obtained from ITS and rbcL markers. We highlighted the potential and limitations of diagnostic tools used for by integrating morphological and molecular methods, and environmental data. Samples for the study were collected from diverse aquatic habitats in Lithuania, Latvia, and Poland, chosen based on herbarium data and literature. Morphological measurements and DNA extraction were performed using the freshly collected samples. Results show that morphological markers, specifically leaf widths, have significant diagnostic value for distinguishing Najas marina from Najas major. Therefore, assist in environmental management planning and ecological assessments as easy to use marker. Our results also show that ISSR markers produce distinct population structures confirming clear separation between Najas marina and Najas major, and underscoring the interspecific plasticity potentially related to specific environmental factors across sites. We confirmed that, currently, two species of the subgenus Najas coexist in separate waterbodies within the south-eastern Baltic region. We also argue that morphological markers are usually adequate for these species when considering morphological plasticity due to environmental properties. However, the use of barcoding markers or markers such as PCR ISSR are preferable when both species are growing sympatrically.

本文研究了Najas marina L. s.s s和Najas major All的表型和遗传差异。在波罗的海东南部地区，检测可靠的诊断标记物。关键问题包括物种分布格局、最显著的形态特征、生态条件对形态的影响以及ISSR标记在评价遗传多样性和结构方面的有效性。结果与ITS和rbcL标记进行对比。我们强调了通过整合形态学和分子方法以及环境数据所使用的诊断工具的潜力和局限性。该研究的样本是从立陶宛、拉脱维亚和波兰不同的水生栖息地收集的，根据植物标本馆的数据和文献选择。使用新采集的样品进行形态学测量和DNA提取。结果表明，形态标记，特别是叶片宽度，对区分小红花和大红花具有重要的诊断价值。因此，辅助环境管理规划和生态评价成为易于使用的标志。我们的研究结果还表明，ISSR标记产生了不同的种群结构，证实了Najas marina和Najas major之间的明显分离，并强调了种间可塑性可能与不同地点的特定环境因素有关。我们证实，目前在波罗的海东南部地区的不同水体中共存着两种Najas亚属。我们还认为，当考虑到由于环境特性造成的形态可塑性时，形态标记通常足以用于这些物种。然而，当两种植物共生生长时，使用条形码标记或PCR ISSR等标记是可取的。

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引用次数: 0

Egeria densa Planch. (Hydrocharitaceae) in Northern Eurasia: genetic similarity and range expansion 尼日利亚致密的普兰奇。欧亚大陆北部的水螅科植物：遗传相似性和分布范围扩展

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-17 DOI: 10.1016/j.aquabot.2025.103970

Andrey Efremov , Elena Antonova , Vasily Vishnyakov , Veronika Grishina , Yuriy Davidyuk , Anastasia Kuznetsova , Aidar Zimnurov

This study presents the first integrative assessment of Egeria densa Planch. invasion in Northern Eurasia using molecular phylogenetics and ensemble species distribution modeling based on over 3200 occurrence records. Genetic analyses revealed high similarity among distant populations, indicating few invasion sources and predominance of clonal reproduction. Modeling identified annual mean temperature, mean temperature of the coldest quarter, and annual precipitation as principal climatic determinants. Results improve predictions of range expansion under climate warming and support targeted management of this invasive species.

这项研究提出了第一个综合评估埃及的密度。基于3200多个发生记录的分子系统发育和集合物种分布模型。遗传分析显示远缘居群间相似性较高，表明入侵源较少，以无性繁殖为主。模型确定年平均温度、最冷季度的平均温度和年降水量是主要的气候决定因素。研究结果改善了气候变暖条件下的活动范围扩张预测，为该入侵物种的针对性管理提供了依据。

引用次数: 0

Effect of exogenous salicylic acid on high temperature resistance of Sargassum muticum under different light conditions 不同光照条件下外源水杨酸对马尾藻耐高温性的影响

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-14 DOI: 10.1016/j.aquabot.2025.103967

Fang Lü, Xiaohui Liu, Liuqing Tang, Meili Xin, Wendan Chi, Dongmei Zhan, Haiyi Wu

Sargassum muticum is one of the dominant species in the coastal algal communities of China, and investigating its response to high-temperature stress is crucial for algal resource conservation and utilization. This study assessed the effects of exogenous salicylic acid (SA: 10.0 μg·mL⁻¹) on the heat tolerance of S. muticum under high light (160 μmol photons·m⁻²·s⁻¹) and low light (80 μmol photons·m⁻²·s⁻¹) at 15°C and 30°C, respectively. The results indicate that at 15°C, growth rate, activities of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD), and the expression of the hsp70 gene in S. muticum were significantly higher under high light than under low light conditions, with non-significant effect of SA. At the elevated temperature of 30°C, S. muticum was able to maintain a daily growth rate exceeding 9 % within 3 days, and the maximum photochemical efficiency (Fv/Fm) showed no significant changes. However, under low light conditions, the content of photosynthetic pigments and the actual quantum yield of PS II (Y(II)) decreased significantly, while malondialdehyde (MDA) content increased markedly; conversely, little change was observed in the high light group. Additionally, the addition of SA significantly enhanced the growth of S. muticum in both high and low light conditions, regulated photosynthetic characteristics, increased the expression of the rbcL gene, enhanced peroxidase activity, and further promoted the expression of the hsp70 gene induced by high temperature. These findings provide insights for the artificial cultivation of S. muticum under challenging environmental conditions.

马尾藻是中国沿海藻类群落的优势种之一，研究其对高温胁迫的响应对藻类资源的保护和利用具有重要意义。本研究评估了外源水杨酸（SA: 10.0 μg·mL−1）对15°C和30°C强光（160 μmol光子·m−2·s−1）和弱光（80 μmol光子·m−2·s−1）下白葡萄耐热性的影响。结果表明，在15℃条件下，强光条件下，白葡萄的生长速度、抗氧化酶超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和过氧化物酶（POD）的活性以及hsp70基因的表达量显著高于弱光条件下，SA的影响不显著。在30℃的高温条件下，3 d内muticum的日生长速度可保持在9 %以上，最大光化学效率（Fv/Fm）无显著变化。但在弱光条件下，光合色素含量和PS II （Y(II)）的实际量子产率显著降低，丙二醛（MDA）含量显著升高；相反，高光组几乎没有变化。此外，SA的添加显著促进了muticum在高、弱光条件下的生长，调节了光合特性，增加了rbcL基因的表达，增强了过氧化物酶活性，并进一步促进了高温诱导的hsp70基因的表达。这些发现为在恶劣的环境条件下人工培养muticum提供了新的思路。

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引用次数: 0

Trans-Atlantic drift of the holopelagic Sargassum natans and S. fluitans on the Moroccan Atlantic coast: First report linked to unusual climatic event and ocean currents in the northeastern Atlantic Ocean 摩洛哥大西洋沿岸的全海马尾藻和S. fluitans的跨大西洋漂移：第一份与大西洋东北部异常气候事件和洋流有关的报告

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-14 DOI: 10.1016/j.aquabot.2025.103966

Khansae Kamal , Khaoula Khaya , Zahira Belattmania , Abdellatif Chaouti , Joao Neiva , Aschwin Hillebrand Engelen , Valérie Stiger-Pouvreau , Ester A. Serrão , Brahim Sabour

The beaching events of holopelagic (free-floating) Sargassum, marked by the substantial influx of brown seaweed along the Atlantic coastlines, present a considerable challenge to marine ecosystems and coastal economies, as its clonal growth disrupts local biodiversity and affects industries including tourism and fisheries. The Sargassum fluitans and S. natans have been found for the first time along the Atlantic coast of Morocco, North Africa, between late March and early May 2024. The beached biomass consisted of the main morphotypes identified in the tropical Atlantic Ocean: S. fluitans var. fluitans (syn. S. fluitans III) and S. natans var. natans (syn. S. natans I) and S. natans var. wingei (syn. S. natans VIII). The in-situ observation of drifting Sargassum populations revealed a density of 10 ± 3 fronds/m² where S. natans var. wingei was the dominant form (58 %). Leading us think of the origin of their transport and stranding on the Atlantic Moroccan coasts that might have been caused by extreme climatic and hydrodynamic events that occurred after Nelson storm late March 2024. Major environmental drivers, including the Sea surface temperature (SST) variability, North Atlantic Oscillation (NAO) index and prevailing wind patterns were considered. This unusual event should prompt more monitoring and vigilance regarding the circulation of marine currents and species introduced into this region.

以褐藻大量涌入大西洋海岸线为标志的全浮游（自由漂浮）马尾藻搁浅事件，对海洋生态系统和沿海经济构成了相当大的挑战，因为其无性系生长破坏了当地的生物多样性，并影响到旅游业和渔业等行业。2024年3月底至5月初，在北非摩洛哥的大西洋沿岸首次发现了马尾藻和S. natans。滩头生物量主要由热带大西洋中发现的主要形态类型组成：S. fluitans var. fluitans （syn. S. fluitans III）、S. natans var. natans （syn. S. natans I）和S. natans var. wingei （syn. S. natans VIII）。现场观测马尾藻种群密度为10 ± 3株/m²，其中翼尾藻为优势种（58 %）。这让我们想到了它们在大西洋摩洛哥海岸的运输和搁浅的起源，这可能是由2024年3月下旬纳尔逊风暴后发生的极端气候和水动力事件造成的。主要的环境驱动因素包括海温（SST）变率、北大西洋涛动（NAO）指数和盛行风型。这一不寻常的事件应促使人们对进入该地区的洋流和物种的环流进行更多的监测和警惕。

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引用次数: 0

Assessing the response of Halimeda incrassata to temperature and light to predict its spread in the NE Atlantic 评估海棠对温度和光照的反应以预测其在东北大西洋的扩散

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-14 DOI: 10.1016/j.aquabot.2025.103968

Belén Roger-Baynat, Marta Sansón, Daniel Álvarez-Canali, Carlos Sangil

In recent decades, many species of tropical distribution have arrived in the Canary Islands due to tropicalization and direct and indirect anthropogenic activity. This is the case of the Caribbean seaweed Halimeda incrassata (Bryopsidales, Chlorophyta) that began to be detected in the eastern Atlantic in 2005 and is now found in the Canary Islands, Madeira, Azores, and the Mediterranean. In this study, an ex-situ experimental approach was carried out to assess the thermal and light tolerance of the species to understand its preferences and predict its expansion. Three experiments were performed, testing temperature and light individually and their interaction. The variables measured were thallus growth (percentage of surface area and increase of number of segments) and net photosynthesis. Results indicate that temperature is the most limiting factor to its growth, with higher temperatures being the most favorable (26–28ºC), while light intensity has a more negligible effect on the species. Consequently, H. incrassata could expand latitudinally until 40ºN, where temperature is over 20ºC for at least several months over the year. As an ecosystem engineer it can modify the environment and the communities where it is established, it is expected to compete with native species such as seagrasses, other macroalgae and garden eel. Further experiments, including acidification conditions and in-situ monitoring, should also be considered to complete the information on its growth limits.

近几十年来，由于热带化和直接或间接的人为活动，许多热带分布的物种已经到达加那利群岛。这就是2005年在东大西洋发现的加勒比海带halimmeda incrassata（苔藓藻类，绿藻）的例子，现在在加那利群岛、马德拉群岛、亚速尔群岛和地中海都有发现。本研究采用迁地实验方法评估了该物种的耐热性和耐光性，以了解其偏好并预测其扩展。进行了三个实验，分别测试了温度和光及其相互作用。测量的变量是菌体生长（表面积百分比和片段数增加）和净光合作用。结果表明，温度是其生长的最大限制因素，较高的温度（26 ~ 28℃）对其生长最有利，而光照强度对其生长的影响可以忽略不计。因此，H. incrassata可以向纬度扩展到40ºN，在那里一年中至少有几个月的温度超过20ºC。作为一种生态系统工程师，它可以改变环境和它所建立的群落，预计它将与海草、其他大型藻类和花园鳗鱼等本地物种竞争。还应考虑进一步的实验，包括酸化条件和现场监测，以完善关于其生长极限的资料。

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引用次数: 0

Incorporating evolutionary history in the explanation of the variation in leaf mass per area and its components of mangrove species 结合进化历史来解释红树林物种单位面积叶质量及其组成的变化

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-13 DOI: 10.1016/j.aquabot.2025.103969

Justin Rugema , Waseem Akram , Jing Gao , Zachee Gasana , Frida Sidik , Lili Wei

Leaf mass per area (LMA) is closely linked to plant resource investment strategies. In most terrestrial plants, variation in LMA is primarily driven by leaf density. However, mangroves develop succulent leaves with high water content as an adaptation to saline environments. We therefore hypothesized that in mangroves, leaf thickness cannot be overlooked in explaining LMA variation, and that it exhibits greater phylogenetic plasticity than density. To test this, we analyzed the relative contributions of thickness and density to LMA variation and assessed their phylogenetic signals across 30 mangrove species in China. The results show that thickness and density contribute comparably to LMA variation in mangrove species. The covariation between LMA and leaf thickness is largely phylogenetically independent, whereas the relationship between LMA and leaf density is phylogenetically conserved. This decoupling indicates that mangroves regulate LMA through environmentally responsive adjustments in thickness, while leaf density is a more evolutionarily constrained trait. Consequently, these findings call into question the broad applicability of LMA as a direct indicator of plant resource investment strategies in mangroves.

单位面积叶质量（LMA）与植物资源投资策略密切相关。在大多数陆生植物中，LMA的变化主要由叶片密度驱动。然而，红树林的多肉叶片具有高含水量，以适应盐水环境。因此，我们假设在红树林中，叶片厚度在解释LMA变化时不能被忽视，并且它比密度表现出更大的系统发育可塑性。为了验证这一点，我们分析了中国30个红树林物种的厚度和密度对LMA变化的相对贡献，并评估了它们的系统发育信号。结果表明，厚度和密度对红树林物种的LMA变化有相当的贡献。LMA与叶片厚度之间的共变异在很大程度上与系统发育无关，而LMA与叶片密度之间的关系在系统发育上是保守的。这种解耦表明，红树林通过对厚度的环境响应性调整来调节LMA，而叶片密度则是一个更受进化约束的特征。因此，这些发现对LMA作为红树林植物资源投资策略的直接指标的广泛适用性提出了质疑。

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引用次数: 0

Megaspore germination and sporophyte emergence requirements in the critically endangered endemic quillwort Isoëtes malinverniana 极度濒危特有刺茅Isoëtes的大孢子萌发和孢子体出苗需求

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-13 DOI: 10.1016/j.aquabot.2025.103965

Abeli Thomas, Bacchetta Alice, Basilico Flavio, Berardo Pietro, Colli Alice, Colonna Ginevra, Pastor Bini Alessandra Balbina, Ruzzoli Alessia, Tucci Martina, Vesconi Giovanna Angela, Vitaloni Diana, Tarascio Martina

Isoëtes malinverniana is a critically endangered quillwort endemic to north-western Italy. Although some aspects of its reproductive biology are well known, megaspore and sporophyte germination ecology have never been studied in detail. In this study, we investigate and clarify the thermal requirements for megaspore germination and sporophyte emergence in I. malinverniana. We tested the effect of five constant temperatures (10, 15, 20, 25, 30 °C) and one alternating temperature (25/15 °C) on megaspore germination and sporophyte emergence in I. malinverniana. Moreover, we tested the effect of light and dark on megaspore germination and, the species self-compatibility and apomictic reproduction. Our results suggest that the optimal temperatures for megaspore germination and sporophyte emergence were 20 °C and 25/15 °C, reaching approximately 80 % germination at these temperatures after eight weeks. Spore germination did not occur at 10 °C and decreased at temperatures above 25 °C. Germination and emergence speed were also positively related to temperature. Megaspore and sporophyte of I. malinverniana germinated and emerged in the dark, but at a lower percentage than in full light. Our study suggests that I. malinverniana is self-compatible and cannot reproduce apomictically.

Isoëtes malinverniana是意大利西北部特有的一种极度濒危的刺茅。虽然其生殖生物学的某些方面是众所周知的，但大孢子和孢子萌发生态学从未被详细研究过。在本研究中，我们调查和阐明了马林菊大孢子萌发和孢子萌发的热需求。研究了5种恒温（10、15、20、25、30°C）和1种交变温度（25/15°C）对马林菊大孢子萌发和孢子体出苗的影响。此外，我们还测试了光照和黑暗对大孢子萌发的影响，以及物种自交亲和性和无分裂生殖的影响。结果表明，大孢子萌发和孢子萌发的最佳温度分别为20℃和25/15℃，8周后萌发率约为80% %。孢子在10°C时不萌发，在25°C以上时萌发减少。发芽率和出苗率也与温度呈正相关。大孢子和孢子体在黑暗条件下萌发出芽，但在光照条件下萌发出芽的比例较低。我们的研究表明，马林菊是自亲和的，不能进行非杂交繁殖。

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引用次数: 0

Effects of increasing temperature on the growth, survival, and non-structural carbohydrate content of the seagrass Halophila beccarii 温度升高对贝氏嗜盐海草生长、存活及非结构性碳水化合物含量的影响

IF 2.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2025-11-01 DOI: 10.1016/j.aquabot.2025.103964

Zhixin Zhong , Liuyuan Zou , Jie Wang , Xiaochen Cheng , Gaoquan He , Le-Zheng Qin

Halophila beccarii, a key habitat-forming seagrass in estuarine and coastal ecosystems, faces increasing threats from rising seawater temperatures. However, its survival strategies and physiological responses to thermal stress remain poorly characterized. This study conducted a field observation investigating the population dynamics of H. beccarii in the Nandu River estuary, China, over two years and a temperature experiment examining its growth, morphological traits, and non-structural carbohydrate (NSC) dynamics under manipulated thermal stress (exposure to 25°C, 30°C, and 35°C for 28 days followed by a 30-day recovery period at 25°C). The results of the field observation showed that extreme temperatures (>40°C) in May 2023 triggered sharp declines in shoot density, biomass, and NSC content, resulting in a near-complete meadow-scale die-off by June 2023. In particular, the enhanced belowground starch reserves coincided with a higher shoot density and biomass, suggesting that meadows with greater biomass and NSC reserves were likely more resilient to thermal stress. Seedling recruitment during October 2023 partially facilitated population recovery. Elevated experimental temperatures (30°C and 35°C) reduced shoot density and inhibited clonal propagation. Leaf width and aboveground soluble sugar content increased at 30°C, suggesting morphological adaptation. During recovery, plant height, rhizome internode length, and belowground NSC content increased, indicating enhanced energy storage and recovery potential. These findings emphasize the lasting effects of thermal stress on H. beccarii, indicating its low resilience to extreme heat stress under future climate change scenarios.

beccarii是河口和沿海生态系统中重要的栖息地形成海草，面临着海水温度上升的日益严重的威胁。然而，其生存策略和对热应激的生理反应仍然不清楚。本研究对南渡河河口贝氏弧菌（H. beccarii）种群动态进行了为期2年的野外观察，并对其生长、形态特征和非结构碳水化合物（NSC）动态进行了温度实验研究，研究了不同温度条件下贝氏弧菌（H. beccarii）的生长、形态特征和非结构碳水化合物（NSC）动态。野外观测结果表明，2023年5月的极端温度（40°C）导致林分密度、生物量和NSC含量急剧下降，到2023年6月，林分密度、生物量和NSC含量几乎完全消失。特别是，地下淀粉储量的增加与较高的茎密度和生物量相一致，表明生物量和NSC储量较大的草甸对热胁迫的适应能力更强。2023年10月的苗木补充部分促进了种群的恢复。升高实验温度（30°C和35°C）降低了芽密度，抑制了无性系繁殖。叶片宽度和地上可溶性糖含量在30℃下增加，表明形态适应。在恢复过程中，植株高度、根茎节间长度和地下NSC含量增加，表明能量储存和恢复潜力增强。这些发现强调了热应激对贝氏弧菌的持久影响，表明其在未来气候变化情景下对极端热应激的适应性较低。

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