Aquatic Botany最新文献

{"title":"Information & education: Extension models used to manage aquatic vegetation in ponds","authors":"Brittany M. Chesser ,&nbsp;Todd D. Sink","doi":"10.1016/j.aquabot.2025.103869","DOIUrl":"10.1016/j.aquabot.2025.103869","url":null,"abstract":"<div><div>Small waterbodies, including ponds, constitute a significant proportion of freshwater area globally, exceeding in number the more frequently studied waterbodies, such as lakes. They support diverse communities of aquatic plants, which are influenced by environmental factors, such as physicochemical conditions, and pressures, such as nearby land use. While these systems are recognized for their high biodiversity, they are frequently used in agricultural activities like crop irrigation and livestock watering. Private landowners and organizations tasked with the management of these ecosystems may not exhibit the fundamental knowledge to incorporate environmental concerns into their management decisions. Although extension initiatives have been documented since the early nineteenth century, the implementation of extension services varies globally due to political status, agricultural crops or production systems, and funding. In this manuscript, we use the state of Texas to showcase extension education models and their role in guiding freshwater pond management, emphasizing the importance of outreach for effective aquatic vegetation management.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103869"},"PeriodicalIF":1.9,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143321816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The identification of abiotic stress by hydrogen peroxide concentration in submerged macrophyte tissues","authors":"Takashi Asaeda ,&nbsp;Katharina Wilfert ,&nbsp;Jonas Schoelynck","doi":"10.1016/j.aquabot.2025.103868","DOIUrl":"10.1016/j.aquabot.2025.103868","url":null,"abstract":"<div><div>Submerged macrophytes in natural streams and stagnant waters are exposed to various abiotic stressors, including solar radiation, temperature fluctuations, and mechanical stress caused by water flow. During photosynthesis, carbohydrates are synthesized using electrons produced by absorbed solar radiation. However, surplus electrons, either due to excessive insufficient consumption, often caused by a lack of carbon dioxide (CO₂) or inorganic carbon, can generate reactive oxygen species (ROS), leading to an increase in hydrogen peroxide (H₂O₂) concentrations. Consequently, the intensity of these stressors is often measured by the concentration of H₂O₂ in plant tissues. It's important to note that H₂O₂ production is not necessarily linked to a single stressor but can result from a combination of environmental factors. The primary objective of the tests was to determine how <em>Myriophyllum spicatum</em> responds to stress and produces H₂O₂ in reaction to flow patterns in streams and to high photosynthetically active radiation (PAR) in stagnant water. Observations were made at six stream sites. At each site, the flow velocity of the unidirectional mean flow (MV) and the turbulence velocity (TV) were measured within <em>M. spicatum</em> patches. In stagnant water, observations were conducted both in a moat where <em>M. spicatum</em> patches were located and in outdoor experimental tanks, where the plants were grown under controlled water temperatures and natural sunlight. <em>Myriophyllum spicatum</em> samples were collected alongside PAR measurements, and the H₂O₂ concentration in plant leaves was analyzed using the TiSO₄ method. In streams, H₂O₂ concentrations were high in areas with very low turbulence. When turbulence reached sufficient levels, concentrations initially declined, then increased with further rising turbulence. In stagnant water, H₂O₂ concentrations, which were higher at elevated temperatures, increased proportionally with PAR intensity. In both scenarios, H₂O₂ levels decreased under extremely high stress, likely due to the deterioration of plant shoots. These results suggest that surplus electrons, arising from either limited electron consumption due to a restricted carbon source for synthesizing organic carbon or an excessive electron supply driven by strong PAR intensity, elevate H₂O₂ concentrations. However, with a sufficient carbon source available, H₂O₂ concentrations increase under heightened turbulence, likely as a result of mechanical stress.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103868"},"PeriodicalIF":1.9,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphotaxonomic, phylogenetic and phytochemical study of the invasive, green-tide-forming macroalga Ulva tepida (Chlorophyta) firstly recorded from the African-Mediterranean coastal waters","authors":"Neamat H. El-Tablawy ,&nbsp;Olfat M.A. Salem ,&nbsp;Lenka Štenclová ,&nbsp;Jan Mareš ,&nbsp;Arthur Yu. Nikulin ,&nbsp;Maha Abdullah Alwaili ,&nbsp;Fauzeya M. Albalwe ,&nbsp;Amr Elkelish ,&nbsp;Marco Cantonati ,&nbsp;Abdullah A. Saber","doi":"10.1016/j.aquabot.2025.103867","DOIUrl":"10.1016/j.aquabot.2025.103867","url":null,"abstract":"<div><div>As a part of our extensive survey on macroalgal distribution along the Egyptian-Mediterranean coasts, a green-tide-forming filamentous <em>Ulva</em> was collected from Alexandria city, and identified as <em>Ulva tepida</em> by a combined integrative approach, including a multilocus sequence dataset of the chloroplast–encoded <em>rbc</em>L gene, the nuclear–encoded SSU rRNA gene and internal transcribed spacer (ITS), and state-of-the-art morphotaxonomy. The species features are consistent with the original description, i.e. tube-like thalli with radial branching in the basal region, chloroplasts covering the outer cell wall, and 1–5 pyrenoids. Biochemical assessment (primary metabolites) showed that the species is rich of carbohydrates, proteins, lipids, phenolics, and flavonoids. Additionally, it has high antioxidant activity and DPPH˙ (2,2-diphenyl-1-picrylhydrazyl) scavenging % value. The fatty acid profile, characterized by gas chromatography–mass spectrometry (GC-MS), revealed high concentrations of palmitic (C16:0) and oleic (C18:1, ω–9) fatty acids (30 % and 24 %, respectively), pointing to the biodiesel-production potential of this species. This is the first record of <em>U. tepida</em>, likely originated from the Indo-Pacific, from the African-Mediterranean coastal waters. Stricter regulations and regular water-quality monitoring, particularly in areas exposed to strong nutrient inputs, are required for this green-tide-forming species. Rapid biological invasions and climate change will significantly alter the native Mediterranean-Sea algal flora, and we believe that <em>U. tepida</em> will be reported as an alien invasive species in other Mediterranean countries.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103867"},"PeriodicalIF":1.9,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systematic review and meta-analysis of the Enemy Release Hypothesis as applied to aquatic plants","authors":"Nompumelelo Catherine Baso ,&nbsp;Martin Patrick Hill ,&nbsp;Angela Bownes ,&nbsp;Julie Angela Coetzee","doi":"10.1016/j.aquabot.2025.103866","DOIUrl":"10.1016/j.aquabot.2025.103866","url":null,"abstract":"<div><div>The Enemy Release Hypothesis (ERH) argues that escape from natural enemies allows exotic plants to become invasive in new habitats. This study provides a critical review of this hypothesis in aquatic plant ecosystems using a meta-analytic approach, considering diverse growth forms, multiple performance parameters, and various study methodologies. The key question posed is whether exotic macrophytes in freshwater ecosystems experience decreased enemy pressure compared to native species, and whether this translates to increased performance parameters. We hypothesize that plant growth form influences ERH expression, with the strongest effects in submerged macrophytes, and that ecological complexity obscures enemy release detection in biogeographical and community studies. A search term based on the key question was formulated and yielded 243 studies. Effects from manipulative experiments revealed significant support for the ERH under abiotic stressors such as eutrophication and temperature change, highlighting the dynamic nature of ecological interactions. However, the 53 community level effects showed contrasting findings, suggesting that native species may outperform invasive conspecifics in more stable environments. The evident complexity of ecological factors considered in the studies used here challenges the theoretical expectations of the ERH, demanding further exploration of alternative mechanisms, such as disturbance, biotic resistance, mutualism, and climate suitability.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103866"},"PeriodicalIF":1.9,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Germination of the invasive water primrose Ludwigia grandiflora in Belgium and potential implications for management","authors":"Olga C. Delange ,&nbsp;Gianmarco Minuti ,&nbsp;Iris Stiers","doi":"10.1016/j.aquabot.2024.103865","DOIUrl":"10.1016/j.aquabot.2024.103865","url":null,"abstract":"<div><div>Invasive Alien Aquatic Plants (IAAPs) are recognised as one of the major threats to aquatic biodiversity globally. Because of their high growth rate and ability to form dense mats, these plants strongly impact biodiversity and the conservation status of aquatic ecosystems. In Belgium, the invasive water primroses <em>Ludwigia</em> spp. are listed on the Invasive Alien Species watchlist, and conventional management actions (manual or mechanical removal) have been carried out, but successful control stories are underreported. Although seed production has not been reported for <em>L. grandiflora</em> in Belgium, local managers suspect it has occurred over the last five to ten years. We studied seed germination of 18 populations within Belgium by growing collected seeds in Petri dishes under a 12|12 h light regime and 14|24°C temperature regime in growth chambers. Results showed that 14 <em>L. grandiflora</em> populations produced germinating seeds, with final germination percentages ranging from 4 % to 77 % at the end of the study. Time to reach 50 % of germination ranged from 12 to 27 days. These results stress the need to implement control measures for seed production of <em>L. grandiflora</em> populations in the management schemes, especially considering the fast emergence and the high number of seeds produced for some populations. The potential germination could hinder management actions by increasing follow-up control efforts and its associated costs. It is thus in the best interest to prevent seeds ripening by removing the vegetative biomass early in new infestations, and by managing the potential soil seed bank in already established ones.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103865"},"PeriodicalIF":1.9,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ecological consequences of breakwater and revetment structures on the Baltic Sea Coast in Germany","authors":"Daniela Glueck ,&nbsp;Nina Feußner ,&nbsp;Anne Herbst ,&nbsp;Hendrik Schubert","doi":"10.1016/j.aquabot.2024.103864","DOIUrl":"10.1016/j.aquabot.2024.103864","url":null,"abstract":"<div><div>Hard structures, such as breakwaters and revetments, while effective at mitigating coastal erosion, induce significant ecological alterations in terrestrial and aquatic environments. To study these effects, field investigations were performed along the Baltic Sea coast in Thiessow, Germany, highlighting breakwaters, a revetment and comparing them to an unprotected area. For this purpose, floristic mappings were carried out along transects on beach and dune. Algae scratch samples and sediment cores were taken, which were also used for nutrient analyses, each with a replicate number of n = 5. Sediment analysis revealed changes in grain size, sorting, water content, organic matter, and nutrient concentrations in areas influenced by breakwaters and revetments. These differences are less distinct on beach and dune. Finer sediments and increased organic content were observed in shallow waters near the breakwaters, while coarser sediments dominated near revetments. Vegetation surveys showed less dune plant species on the breakwater site and a pronounced shift towards ruderal plant species. Revetments eliminated terrestrial vegetation entirely due to their impermeable structure directly on the beach. The introduction of hard substrate in soft-bottom habitats in the shallow water favours the settlement of macroalgae, whereby there is only a weak zonation with regard to the distribution of species on the structures. Meanwhile, no seagrass meadows were recorded near the breakwater which could indicate supressing effects. These findings underscore the ecological consequences of hard coastal protection and emphasize the importance of integrating ecological considerations into coastal protection strategies to balance shoreline stabilization and preservation of natural habitats.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103864"},"PeriodicalIF":1.9,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-destructive biomass estimation for eelgrass (Zostera marina): Allometric and percent cover-biomass relationships vary with environmental conditions","authors":"Jordan A. Thomson,&nbsp;Benedikte Vercaemer,&nbsp;Melisa C. Wong","doi":"10.1016/j.aquabot.2024.103853","DOIUrl":"10.1016/j.aquabot.2024.103853","url":null,"abstract":"<div><div>Estimating plant biomass reliably over large areas while minimizing impacts on sampled habitats is an important goal in plant ecology. Often, this is accomplished by first using a small number of harvested plants to quantify the relationship between plant biomass and less destructive predictor variables (e.g., height, cover), and then applying this relationship across larger spatial scales. However, the influence of environmental conditions on these relationships is often poorly understood. Here, we assess the impact of environmental variability on two biomass estimation functions for the seagrass <em>Zostera marina</em> in Atlantic Canada: the allometric leaf length-weight relationship and the relationship between percent cover and above-ground biomass (AGBM). First, we determined allometric and cover-AGBM regression relationships at the regional level using data from all sites pooled. We then investigated whether these models could be improved by including a site group covariate based on principal component analysis of site-level environmental data. At the regional level, allometric and cover-biomass models were both strongly significant, although uncertainty was high in the cover-AGBM model. Both models improved markedly when environmental variability (i.e., site group) was included: in warm, shallow conditions, eelgrass leaves were lighter for a given length, and AGBM increased at a slower curvilinear rate with percent cover. This indicates that environmental effects on eelgrass morphological traits not typically included in biomass models (e.g., leaf thickness, rigidity) can be important. Our study suggests that environmental effects on eelgrass biomass models should be considered, particularly when highly accurate estimates with low uncertainty are required.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103853"},"PeriodicalIF":1.9,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response of the submerged macrophyte Stuckenia pectinata (L.) Börner to warming in different climate regions: A synchronized oligohaline mesocosm experiment","authors":"Md Masum Billah ,&nbsp;Gültekin Yılmaz ,&nbsp;Cihelio Alves Amorim ,&nbsp;Meltem Kuyumcu ,&nbsp;Onat Arıkan ,&nbsp;Mustafa Korkmaz ,&nbsp;İrem Gamze Arık ,&nbsp;Meryem Beklioğlu ,&nbsp;Erik Jeppesen ,&nbsp;Korhan Özkan","doi":"10.1016/j.aquabot.2024.103855","DOIUrl":"10.1016/j.aquabot.2024.103855","url":null,"abstract":"<div><div>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, <em>Stuckenia pectinata</em> (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. <em>S. pectinata</em> 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.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103855"},"PeriodicalIF":1.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis of the chloroplast genomes of different strains of Pyropia haitanensis","authors":"Hongzi Song ,&nbsp;Zhicong Gao ,&nbsp;Haimin Chen ,&nbsp;Shanshan Zhu","doi":"10.1016/j.aquabot.2024.103854","DOIUrl":"10.1016/j.aquabot.2024.103854","url":null,"abstract":"<div><div><em>Pyropia haitanensis</em>, 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 <em>P. haitanensis</em> 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 <em>P. haitanensis</em>. These regions are eight intergenic spacer regions: <em>petJ</em>-<em>carA</em>, <em>ORF32</em>-<em>ycf35</em>, <em>rbl35</em>-<em>pbsA</em>, <em>ORF68</em>-<em>accB</em>, <em>psbB</em>-<em>psbT</em>, <em>syh</em>-<em>groEL</em>, <em>ORF107</em>-<em>ycf12</em>, <em>rpl32</em>-<em>ORF263</em>. 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 <em>P. haitanensis</em>, but also offered valuable resources for future research, breeding efforts, and utilization of this economically important marine crop.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103854"},"PeriodicalIF":1.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and functional dynamics of coralline algal systems under warming scenarios: Insights into vulnerability, and resilience","authors":"Andrea Bautista-García ,&nbsp;Patricia M. Valdespino-Castillo ,&nbsp;Teresa Pi-Puig ,&nbsp;Fabio Favoretto ,&nbsp;Martín Merino-Ibarra ,&nbsp;Javier A. Ceja-Navarro ,&nbsp;Silvia Espinosa-Matías ,&nbsp;Javier Tadeo León ,&nbsp;Anidia Blanco-Jarvio","doi":"10.1016/j.aquabot.2024.103851","DOIUrl":"10.1016/j.aquabot.2024.103851","url":null,"abstract":"<div><div>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: <em>Neogoniolithon trichotomum</em>-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 <em>N. trichotomum</em> 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.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103851"},"PeriodicalIF":1.9,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}