Aquatic Botany最新文献_第10页

Response of the submerged macrophyte Stuckenia pectinata (L.) Börner to warming in different climate regions: A synchronized oligohaline mesocosm experiment 沉水植物果胶菌（Stuckenia pectinata， L.）的响应Börner对不同气候区域变暖的影响：一个同步的低盐中尺度实验

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-12-13 DOI: 10.1016/j.aquabot.2024.103855

Md Masum Billah , Gültekin Yılmaz , Cihelio Alves Amorim , Meltem Kuyumcu , Onat Arıkan , Mustafa Korkmaz , İrem Gamze Arık , Meryem Beklioğlu , Erik Jeppesen , Korhan Özkan

Submerged macrophytes play a crucial role as primary producers and contribute essential ecosystem functions and services, but rising temperatures caused by climate change may alter their functional traits. We aimed to assess the effects of simulated climate warming (4.5 °C) on the functional trait responses of a submerged macrophyte, Stuckenia pectinata (L.) Börner, in a synchronized oligohaline (4 ppt salinity) mesocosm experiment conducted in two different climate regions in Turkey: cold semi-arid Ankara and hot, dry Mediterranean Mersin. The experiment was conducted using eight mesocosms at each site, with four replicates of each ambient temperature and warming treatment. Each mesocosm held 5000 L and was inoculated with natural sediment, plankton, macroinvertebrate and fish communities to represent natural oligohaline lake ecosystem. S. pectinata shoots collected from a single population from a coastal lake in Mersin were also inoculated in all mesocosms in similar abundances. Overall, we observed significant differences in macrophyte functional traits between the two sites with different climates, albeit with less pronounced effects of a 4.5 ºC rise in temperature within each site. Specifically, higher macrophyte percent volume infested (PVI) and canopy height were observed in the warmer Mersin than in the colder Ankara, which we attributed to higher shading by phytoplankton (reflected by water column Chlorophyll a, Chl-a). The biomass ratio (%dry weight (DW)/wet weight (WW)) was notably higher in Ankara, suggesting that the macrophytes in Ankara acquired relatively more resources than those in Mersin. The pronounced differences between the two sites likely reflected not only temperature differences but also cascading ecosystem characteristics (e.g., water column Chl-a, water nutrients) due to climatic differences.

潜水植物作为初级生产者具有重要的生态系统功能和服务，但气候变化引起的温度升高可能改变其功能特征。本研究旨在评估模拟气候变暖（4.5°C）对沉水大型植物pectinata Stuckenia （L.）功能性状响应的影响。Börner，在土耳其两个不同气候区：寒冷半干旱的安卡拉和炎热干燥的地中海梅尔辛进行的同步低盐（4 ppt盐度）中尺度实验中。在每个试验点设置8个中生态系统，每种环境温度和加温处理设置4个重复。每个中生态含有5000 L，接种了天然沉积物、浮游生物、大型无脊椎动物和鱼类群落，代表天然低盐湖泊生态系统。从梅尔辛沿海湖泊的一个单一种群收集的果胶菊芽也接种在所有中生态系统中，丰度相似。总体而言，我们观察到不同气候条件下两个地点的大型植物功能性状存在显著差异，尽管每个地点温度升高4.5ºC的影响不太明显。具体而言，温暖的梅尔辛比寒冷的安卡拉观测到更高的大型植物侵染体积百分比（PVI）和冠层高度，我们将其归因于浮游植物的更高遮阳（通过水体叶绿素a， Chl-a反映）。安卡拉的生物量比（干重/湿重）显著高于梅尔辛，表明安卡拉的大型植物获得的资源相对较多。两个地点之间的显著差异可能不仅反映了温度差异，还反映了气候差异导致的级联生态系统特征（如水柱Chl-a，水营养物）。

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引用次数: 0

Comparative analysis of the chloroplast genomes of different strains of Pyropia haitanensis 海地焦蝇不同品系叶绿体基因组的比较分析

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-12-12 DOI: 10.1016/j.aquabot.2024.103854

Hongzi Song , Zhicong Gao , Haimin Chen , Shanshan Zhu

Pyropia haitanensis, an economically and nutritionally significant marine crop, is extensively cultivated in China. This study employed genome skimming to assemble and annotate the chloroplast genome sequences of 15 different strains of P. haitanensis and conducted a comparative analysis of the chloroplast genome structure and characteristics. The assembled chloroplast genomes ranged in size from 195,577 to 201,312 base pairs (bp) and contained annotations for 253 (or 254 in some strains) genes associated with photosynthesis, transcription, biosynthesis and other essential processes. The number of simple repeat sequences (SSRs) varied between 28 and 30, with AT as the most abundant two-base repeat sequence. Despite overall conservation in the chloroplast genome structure, we identified eight highly variable regions that can serve as potential molecular markers for distinguishing different strains of P. haitanensis. These regions are eight intergenic spacer regions: petJ-carA, ORF32-ycf35, rbl35-pbsA, ORF68-accB, psbB-psbT, syh-groEL, ORF107-ycf12, rpl32-ORF263. Phylogenetic analysis indicates that the 15 strains mainly divide into three subgroups, suggesting a degree of genetic differentiation among them. Overall, this study not only contributed to the understanding of the genetic variation of P. haitanensis, but also offered valuable resources for future research, breeding efforts, and utilization of this economically important marine crop.

海檀焦皮（Pyropia haitanensis）是一种经济和营养意义重大的海洋作物，在中国广泛种植。本研究采用基因组skimming的方法，对15个不同菌株的海地紫檀叶绿体基因组序列进行了组装和注释，并对叶绿体基因组结构和特征进行了比较分析。组装的叶绿体基因组大小在195,577至201,312个碱基对（bp）之间，包含253个与光合作用，转录，生物合成和其他基本过程相关的基因（某些菌株为254个）注释。简单重复序列（SSRs）的数量在28 ~ 30个之间，其中AT是最丰富的双碱基重复序列。尽管叶绿体基因组结构总体上是保守的，但我们发现了8个高度可变的区域，可以作为区分海地紫檀不同菌株的潜在分子标记。这些区域是8个基因间间隔区：petJ-carA、ORF32-ycf35、rbl35-pbsA、ORF68-accB、psbB-psbT、syh-groEL、ORF107-ycf12、rpl32-ORF263。系统发育分析表明，15株菌株主要分为3个亚群，表明它们之间存在一定程度的遗传分化。总体而言，本研究不仅有助于了解海棠的遗传变异，而且为海棠的进一步研究、育种和利用提供了宝贵的资源。

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引用次数: 0

Structural and functional dynamics of coralline algal systems under warming scenarios: Insights into vulnerability, and resilience 变暖情景下珊瑚藻系统的结构和功能动态：对脆弱性和恢复力的见解

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-12-10 DOI: 10.1016/j.aquabot.2024.103851

Andrea Bautista-García , Patricia M. Valdespino-Castillo , Teresa Pi-Puig , Fabio Favoretto , Martín Merino-Ibarra , Javier A. Ceja-Navarro , Silvia Espinosa-Matías , Javier Tadeo León , Anidia Blanco-Jarvio

Globally, climate change affects reef ecosystems, causing community reconfigurations and ecological impacts. Coralline rhodophyta are one of the reef groups most vulnerable to synergistic warmer temperatures, and ocean acidification. Yet, mineralogic, microstructural, and chemical studies of their thalli are necessary to understand their vulnerability and resilience. Here, we studied mineralogy, microstructure, and chemistry of adjacent coralline rhodophyta systems in La Paz Bay: Neogoniolithon trichotomum-dominated tidal pools, and rhodoliths from a shallow rhodolith bed at San Lorenzo channel. These systems depicted mineral diversity, including different phases of high-magnesium calcites in rhodoliths. The carbonates in N. trichotomum included Mg-calcite, aragonite, ankerite, and Fe-carbonates. Compositional X-ray maps of calcium and magnesium in rhodoliths reproduce very well the concentric growth band-structure. In a complementary way, the bands richest in calcium are the poorest in magnesium, and vice versa. They are most likely related to the high-magnesium phases detected by bulk XRD-Rietveld, as indicated by their similar EPMA-WDS Mg:Ca ratios. Chemical imaging at the microscale revealed iron was distributed in the primary mineral structure, in contrast with detritic elements, such as Al and Si, located in the algal surface (perithallus). Because algal elemental content is sensitive to environmental conditions, La Paz Bay coralline rhodophyta systems emerge as interesting models to monitor high-magnesium carbonate, in a scenario of tropicalization.

在全球范围内，气候变化影响珊瑚礁生态系统，导致群落重新配置和生态影响。珊瑚红藻是最容易受到增温和海洋酸化影响的珊瑚礁群之一。然而，对它们的菌体进行矿物学、微观结构和化学研究对于了解它们的脆弱性和恢复力是必要的。在这里，我们研究了拉巴斯湾邻近的珊瑚红石系统的矿物学、微观结构和化学特征：以新戈onithontrichotomium为主的潮汐池，以及来自圣洛伦佐海峡浅层红石床的红石。这些系统描绘了矿物多样性，包括rhodoliths中不同阶段的高镁方解石。赤眼龙的碳酸盐主要有镁方解石、文石、铁白云石和铁碳酸盐。红石中钙和镁的x射线组成图很好地再现了同心圆生长带结构。以一种互补的方式，钙含量最高的条带是镁含量最低的条带，反之亦然。它们很可能与体XRD-Rietveld检测到的高镁相有关，正如它们相似的EPMA-WDS Mg:Ca比值所表明的那样。微尺度化学成像显示，铁元素主要分布在原生矿物结构中，而铝、硅等碎屑元素主要分布在藻表面（藻周）。由于藻类元素含量对环境条件很敏感，在热带化的情况下，拉巴斯湾珊瑚红藻系统成为监测高碳酸镁的有趣模型。

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引用次数: 0

Seasonal trait variation and functional niche overlap of macrophyte growth forms 大型植物生长形态的季节性状变化与功能生态位重叠

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-12-09 DOI: 10.1016/j.aquabot.2024.103852

Lindsay Louise Trottier , Ashley Hoblyn , Lars Lønsmann Iversen

Macrophytes provide many ecosystem processes and functions which support freshwater ecosystem services, and the ecological role of a macrophyte is related to its growth form (emergent, free-floating, floating rooted, submerged). Differences between growth forms and the relationships between ecosystem functioning and environmental conditions can be described by functional traits. Seasonal variation in functional trait expression can lead to alterations in ecosystem functioning. As such, when inferring trait-environment relationships, a species’ functional niche should capture this temporal variation. However, it is unknown how functional traits in macrophytes vary seasonally, and the importance of between-growth form variation. Using hypervolume analysis and linear mixed effect modelling, we demonstrate that seasonal trait variation within-growth forms is stronger than between-growth form variation over time. We found that emergent macrophytes have significantly (p < 0.01) higher specific leaf area in June compared to September. Whereas leaf nutrients (total nitrogen and phosphorus), are significantly higher early in the growing season for emergent, floating rooted, and submerged plants (p < 0.05). We show that the large functional niche of submerged macrophytes is shaped by seasonal variation, and that the functional niches of all macrophyte growth forms overlap, suggesting redundancies in the maintenance of ecosystem functions. Together, this study demonstrates the influence of seasonal variation on macrophyte functional traits. Thus, seasonality is relevant to our understanding of aquatic ecosystem functioning and must be considered when determining the ecological role of macrophytes across a season. This study provides rationale for further examinations of between-growth form redundancies in the ecological role of macrophytes.

大型植物提供了许多支持淡水生态系统服务的生态系统过程和功能，其生态作用与其生长形式（突生、自由漂浮、浮根、沉水）有关。生长形式之间的差异以及生态系统功能与环境条件之间的关系可以用功能性状来描述。功能性状表达的季节变化可导致生态系统功能的改变。因此，在推断性状-环境关系时，物种的功能生态位应该捕捉到这种时间变化。然而，目前尚不清楚大型植物的功能性状是如何随季节变化的，以及生长形式之间变化的重要性。利用超体积分析和线性混合效应模型，我们证明了生长形式内部的季节性性状变化强于生长形式之间随时间的变化。结果表明，6月份突发性大型植物比叶面积显著高于9月份（p <； 0.01）。而在生长季早期，浮根植物、浮根植物和淹水植物的叶片养分（总氮和总磷）显著较高（p <； 0.05）。研究表明，淹没植物的大型功能生态位受季节变化的影响，所有大型植物生长形式的功能生态位重叠，表明生态系统功能的维持是冗余的。总之，本研究证明了季节变化对大型植物功能性状的影响。因此，季节性与我们对水生生态系统功能的理解有关，在确定大型植物在一个季节中的生态作用时必须考虑到季节性。该研究为进一步研究大型植物在生态作用中的生长形式冗余提供了理论依据。

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引用次数: 0

No endemic Isoëtes (Isoëtaceae) species in the North Asian Pacific evidenced by genetic and morphological analysis 在北亚太平洋无特有的Isoëtes （Isoëtaceae）种，经遗传和形态分析证实

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-12-02 DOI: 10.1016/j.aquabot.2024.103850

Maxim Yu. Grigoryan , Polina A. Volkova , Maria O. Ivanova , Olga A. Mochalova , Maria D. Logacheva , Tatyana V. Neretina , Alexander A. Bobrov

The genus Isoëtes is a unique group of lycophytes that offers valuable insights into plant evolution. However, taxonomic issues and evolutionary pathways within the genus require further study, particularly in North-East Asia, where only representatives of the I. echinospora complex occur. We studied genetic (nuclear DNA LFY2int and IBR3 regions, transcriptomes) and morphological (size and ornamentation of mega- and microspores, velum coverage) variability of Isoëtes populations, focusing on the Russian Far East. We found no clear genetic and morphological differentiation between European and North Asian populations of diploid I. echinospora s.l. (the latter was referred to as I. asiatica), not supporting treatment of I. asiatica as a separate species. The finding of samples with spiny papillate microspores in some North Asian populations of I. echinospora s.l. (neither differentiated by the other morphological characters, nor genetically) is of particular interest. Genetic analysis of the North Asian Pacific tetraploid I. maritima (initially referred to as I. beringensis) revealed its origin from diploid progenitors close to I. echinospora and North American I. bolanderi or I. howellii, as has been shown earlier for North American populations. This finding supports treatment of the North Asian and North American populations of I. maritima as one species, in line with their morphological similarity.

Isoëtes属是一个独特的石松植物群，为植物进化提供了有价值的见解。然而，属内的分类学问题和进化途径需要进一步研究，特别是在东北亚，那里只有棘孢孢子虫复合体的代表。我们研究了Isoëtes种群的遗传变异（核DNA LFY2int和IBR3区域，转录组）和形态变异（大孢子和小孢子的大小和装饰，绒毛盖度），重点研究了俄罗斯远东地区。我们发现二倍体棘孢螨（i.c echinospora s.l.）的欧洲种群和北亚种群（i.c echinospora s.l.）在遗传和形态上没有明显的差异，不支持将棘孢螨作为一个单独的种来处理。在棘球孢子虫（i.e echinospora s.l.）的一些北亚种群（既不以其他形态特征区分，也不以遗传特征区分）中发现带有带刺乳头状小孢子的样本是特别有趣的。对北亚太平洋四倍体I. maritima（最初称为I. beringensis）的遗传分析表明，它起源于与棘孢I. echinospora和北美I. bolanderi或I. howellii接近的二倍体祖先，正如先前在北美种群中所显示的那样。这一发现支持了北亚和北美海苔属作为一个物种的处理，与它们的形态相似性一致。

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引用次数: 0

Neotypification of the Sporolithon mediterraneum Heydrich (Sporolithales, Corallinophycidae, Rhodophyta) and the status of Sporolithon in the Mediterranean Sea 地中海地中海孢子石的新分型及孢子石在地中海的地位

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-11-30 DOI: 10.1016/j.aquabot.2024.103839

Andrea Cabrito , Sara Kaleb , Viviana Peña , Annalisa Falace

A neotype specimen is designated for the coralline alga Sporolithon mediterraneum Heydrich (Sporolithales, Corallinophycidae, Rhodophyta) and critically examined here, since the original holotype specimen apparently has been destroyed. The neotype specimen was collected in a mesophotic rhodolith bed near Gorgona Island (Tyrrhenian Sea, Mediterranean). Additional specimens were collected in a rhodolith bed in the Menorca Channel (Western Mediterranean) and were used to confirm the identification of the neotype. Molecular analyses of psbA and rbcL with all Sporolithon species for which there are currently sequence data, including S. ptychoides and S. molle supported the designation of this neotype and the circumscription of this Mediterranean species. Additional specimens from Menorca Channel were resolved as conspecific based on psbA sequences. The morpho-anatomical data presented indicated that S. mediterraneum can be also distinguished from the type species Sporolithon ptychoides Heydrich and Sporolithon molle (Heydrich) Heydrich, the only two other species previously reported from the Mediterranean Sea, by the occurrence of 5–6 cell paraphyses and larger stalk cells. A consideration of the status of Sporolithon in the Mediterranean region is also discussed.

珊瑚藻Sporolithon mediterraneum Heydrich （Sporolithales, Corallinophycidae, rhodophyia）的新模式标本被指定并在这里进行了严格的检查，因为原来的完整模式标本显然已经被破坏了。该新型标本采集于地中海第勒尼安海戈尔戈纳岛附近的一个中孔罗石层。在梅诺卡海峡（西地中海）的rhodolith床中收集了其他标本，并用于确认新类型的鉴定。对包括S. ptychoides和S. molle在内的所有有序列数据的孢子石物种的psbA和rbcL分子分析支持了该新型的命名和该地中海物种的界定。其他来自Menorca海峡的标本根据psbA序列被解析为同种。形态学解剖数据表明，地中海S. mediterraneum还可以与模式种Sporolithon ptychoides Heydrich和Sporolithon molle (Heydrich) Heydrich（地中海仅有的另外两个物种）区分开来，因为存在5-6个细胞畸形和较大的柄细胞。本文还讨论了地中海地区孢子石的现状。

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引用次数: 0

Within-lake isolation and reproductive strategy of Stuckenia pectinata (L.) Börner at Lake Naivasha (Kenya): About water level fluctuations and alien species pectinata （L.）菌的湖内隔离与繁殖策略Börner奈瓦沙湖（肯尼亚）：关于水位波动和外来物种

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-11-27 DOI: 10.1016/j.aquabot.2024.103840

Ludwig Triest , Tim Sierens , Josphine Njambuya , Taita Terer , Iris Stiers

Submerged aquatic plants with mixed reproduction mode may show enhanced clonal growth explained by environmental conditions. For Stuckenia pectinata (L.) Börner this has been linked to within-lake factors, both biotic (tuber predation, herbivory, periphyton shading) and abiotic (hydrological connectivity, sediment type). We investigated the S. pectinata population from Lake Naivasha, where submerged aquatic plants tolerated strong historical water level fluctuations until introduced crayfish, shading by floating exotic weeds and increased turbidity nearly eradicated them, although some stands now rebounded in various lake areas. Using 13 nuclear microsatellite loci, we analyzed genetic diversity and structure of S. pectinata subpopulations along the southeastern shoreline of the main lake and inside Crescent Island Crater, a peripheral lake basin enclosed within the rim of an extinct volcano. Results revealed a predominantly sexual reproductive strategy with limited clonal expansion in the main lake contrasting with pronounced clonal growth in the crater basin. Each subpopulation experienced recent bottlenecks. Crater basin subpopulations exhibited the strongest divergence, lower clonal diversity and larger-sized clones. We explain this differentiation by the exposed crater rim acting as barrier, isolating the crater basin from the main lake during recent decades when low water levels prevailed, accompanied with less negative impact from alien species than in the main lake. Clonal extension occurred on steep-sloping hard sandy substrates, that likely prompted local reproductive adaptations. Genetic diversity, clonal structure and connectivity patterns are discussed in the light of the specific history and features of Lake Naivasha.

混合繁殖模式的沉水水生植物克隆生长加快可能与环境条件有关。果胶链球菌（L.）Börner这与湖内因素有关，包括生物因素（块茎捕食、草食、周围植物遮荫）和非生物因素（水文连通性、沉积物类型）。我们调查了来自Naivasha湖的S. pectinata种群，在小龙虾引入之前，该湖的水下水生植物耐受了强烈的历史水位波动，漂浮的外来杂草遮蔽了它们，浊度增加几乎根除了它们，尽管一些林分现在在不同的湖区反弹。利用13个核微卫星位点，分析了主湖东南岸线和月牙岛火山口（一个封闭在死火山边缘的外围湖盆）内的S. pectinata亚群的遗传多样性和结构。结果表明，与火山口盆地克隆生长明显相反，主湖克隆繁殖策略以有性繁殖为主，克隆扩张有限。每个亚种群最近都经历了瓶颈。火山口盆地亚居群分化最强，无性系多样性较低，无性系大小较大。我们解释了这种差异，暴露的火山口边缘作为屏障，在近几十年的低水位期间将火山口盆地与主湖隔离开来，同时外来物种的负面影响比主湖小。克隆扩展发生在陡峭的硬砂基质上，这可能促进了当地的生殖适应。结合奈瓦沙湖的具体历史和特征，讨论了遗传多样性、克隆结构和连通性模式。

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引用次数: 0

Micro- and ultrastructural features for the distinction of Phymatolithon lusitanicum from Phymatolithon calcareum 硅石藻与钙石藻区分的超微结构特征

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-11-26 DOI: 10.1016/j.aquabot.2024.103838

Francesca Panizzuti , Aurora Giorgi , Maggie D. Johnson , Daniela Basso

Calcifying red algae foster unique and rich biological communities and are important component of the global C cycle. Rhodolith beds are globally distributed biodiversity hotspots that are engineered by free-living calcifying red algae, and maërl beds are a type of rhodolith bed typically characterized by free-living, twig-like coralline algae with a branched growth form. Phymatolithon calcareum, along with the more recently described Phymatolithon lusitanicum is considered a major component of maërl beds in Europe. Here, we explore the morphology of the vegetative thallus of P. calcareum and P. lusitanicum. Our aim is to identify statistically valuable morphological features that can be used to differentiate these two species of algae that are macroscopically very similar, frequently sterile, and share the same habitat. Morphological features have historically failed to aid in distinguishing P. lusitanicum from P. calcareum. Our observations of seasonal growth patterns, the arrangement of perithallial cells in filaments, and the size of cell fusions provide noteworthy advances in our ability to use morphological features to identify the different species. Additionally, ultrastructural characteristics appear to be a reliable distinguishing feature between the two Phymatolithon species.

钙化红藻培育出独特而丰富的生物群落，是全球碳循环的重要组成部分。Rhodolith床是全球分布的生物多样性热点，由自由生活的钙化红藻设计，maërl床是一种Rhodolith床，其典型特征是自由生活的枝状珊瑚藻，具有分支生长形式。Phymatolithon calcareum，以及最近描述的Phymatolithon lusitanicum被认为是欧洲maërl床的主要成分。在这里，我们探讨了P. calcareum和P. lusitanicum营养菌体的形态。我们的目的是确定统计学上有价值的形态特征，这些特征可以用来区分这两种宏观上非常相似、经常不育、共享相同栖息地的藻类。形态学特征在历史上未能帮助区分lusitanicum和P. calcareum。我们对季节性生长模式的观察，表皮细胞在细丝中的排列，以及细胞融合的大小，为我们利用形态学特征识别不同物种的能力提供了显著的进步。此外，超微结构特征似乎是两个藻石物种之间可靠的区分特征。

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引用次数: 0

Effects of rainwater on the carrageenan yield and quality and dry yield biomass of eucheumatoid seaweed Kappaphycus alvarezii 雨水对拟真金藻卡拉胶产量、品质及干产量生物量的影响

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-11-25 DOI: 10.1016/j.aquabot.2024.103837

Albaris B. Tahiluddin , Rizal Jhunn F. Robles , Mur-hamida S. Eldani-Tahiluddin

Kappaphycus alvarezii, a commercially valuable eucheumatoid seaweed, is widely cultivated in equatorial regions for its kappa-carrageenan. A common post-harvest practice among local farmers involves drying the seaweed using the hanging method, often with exposure to rain. This study investigates the effects of rainwater exposure on the carrageenan yield and quality, as well as the dry yield biomass, of K. alvarezii. Four rainwater soaking times (0, 30, 60, and 90 min) were applied to both fresh and dried forms of K. alvarezii. The samples were then dried or re-dried, and their carrageenan properties were analyzed. Results indicate that rainwater significantly reduces dry yield biomass in both fresh and dried forms, while substantially improving carrageenan yield. In its fresh form, exposure to rainwater notably increased gel strength after 90 min of soak. However, when dried seaweed was soaked and re-dried, gel strength was reduced. Rainwater generally had no effect on viscosity or syneresis index. Gelling temperature was significantly affected by rainwater exposure in fresh seaweed but not in dried samples. Melting temperature in fresh forms was unaffected, but rainwater exposure reduced it in dried seaweed after 90 min of soak. Moisture content was significantly reduced by rainwater in both fresh and dried forms. This research highlights the potential impacts of rainwater on the post-harvest processing of Kappaphycus.

Kappaphycus alvarezii是一种具有商业价值的拟真鱼类海藻，因其含有kappa- carrage胶而在赤道地区广泛种植。当地农民在收获后的一种常见做法是用悬挂的方法晒干海藻，通常是在雨中曝晒。本文研究了雨水暴露对鹿角胶产量、品质和干产量生物量的影响。对新鲜和干燥形式的alvarezii施加4种雨水浸泡时间（0、30、60和90 min）。然后将样品干燥或再干燥，并分析其卡拉胶性质。结果表明，雨水显著降低了新鲜和干燥形式的干产量生物量，同时显著提高了卡拉胶产量。在其新鲜形式下，暴露在雨水中浸泡90 min后，凝胶强度显著增加。然而，当干燥的海藻被浸泡和再干燥时，凝胶强度降低。雨水一般对黏度和增效指标没有影响。雨水暴露对鲜海藻胶凝温度有显著影响，而对干海藻胶凝温度无显著影响。新鲜形式的融化温度不受影响，但在浸泡90 分钟后，雨水暴露降低了干燥海藻的融化温度。新鲜和干燥形式的雨水都显著降低了水分含量。本研究强调了雨水对木柏采后加工的潜在影响。

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A living fossil charophyte Lychnothamnus barbatus newly found in southern Siberia (North Asia) 在西伯利亚南部（北亚）新发现的一种活化石charophyte Lychnothamnus barbatus

IF 1.9 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Aquatic Botany

Pub Date : 2024-11-23 DOI: 10.1016/j.aquabot.2024.103836

Denis Yu. Efimov , Lyudmila A. Efimova , Roman E. Romanov

Lychnothamnus barbatus (Charophyceae, Characeae), one of the rarest relict macroscopic charophyte species in the world, has a distinct disjunctive range, having been known from fossil remains in northern Asia for a long period. Living plants of Lychnothamnus barbatus were found in freshwater lakes in southern Siberia in the Minusinsk forest-steppe (south of Krasnoyarsk Territory, Russia), within a conservation area in the Shushenskii Bor National Park. These sites are the first ones in Siberia and North Asia. The localities are situated far from known extant records from Central and Eastern Asia, which confirms the uniqueness and vulnerability of the extant habitats.

barbatus Lychnothamnus （Charophyceae, chareae）是世界上最罕见的宏观蕨类孑遗物种之一，具有明显的分离范围，在北亚的化石遗骸中已经发现了很长时间。在西伯利亚南部Minusinsk森林草原（俄罗斯克拉斯诺亚尔斯克地区南部）的淡水湖中，在Shushenskii Bor国家公园的一个保护区内发现了活的Lychnothamnus barbatus植物。这些遗址是西伯利亚和北亚的第一批遗址。这些地点与已知的中亚和东亚现存记录相去甚远，这证实了现存栖息地的独特性和脆弱性。

引用次数: 0