Aquatic Botany最新文献

{"title":"A trajectory of Zostera marina (eelgrass) ecosystem recovery: pre- and post-Hurricane Sandy degradation in Barnegat Bay, New Jersey","authors":"Edgar A. Medina,&nbsp;Abdullah J. Alhaddad,&nbsp;Adi Ackerman,&nbsp;Julia Kopell,&nbsp;Nicole Rodriguez Ortiz,&nbsp;Mya-Hali T. Theodore,&nbsp;Paul A.X. Bologna ,&nbsp;James J. Campanella","doi":"10.1016/j.aquabot.2023.103744","DOIUrl":"10.1016/j.aquabot.2023.103744","url":null,"abstract":"<div><p>In 2012, Hurricane Sandy struck Barnegat Bay, New Jersey damaging extensive beds of <span><em>Zostera marina</em></span><span><span> and causing major benthic ecosystem disruptions. Pre-Sandy genetic surveys of eelgrass populations in Barnegat Bay indicated low </span>heterozygosity and connectivity with high levels of inbreeding. After such devastation, we became concerned with the long-term fate of these populations and in previous work examined the present genetic condition of eelgrass in Barnegat Bay. Counter to our expectations, the 2021 </span><em>Z. marina</em> populations were more diverse, had greater connectivity and less inbreeding than the populations from 2008. These results further motivated us to examine the trajectory of changes between 2008 and 2021 through additional investigation of archival <em>Z. marina</em><span> samples from 2013 and 2017. This present study tracks the trajectory of Barnegat Bay eelgrass population genetics before and after Hurricane Sandy. Immediately post Sandy, populations were already more diverse with heterozygosity closer to Hardy-Weinberg Equilibrium; by 2021, two populations, Oyster Creek and Ham Island, demonstrated a surplus of heterozygotes. Similarly, in 2013 there was a three to eight-fold reduction in inbreeding observed with clear outbreeding by 2017. There was no evidence of recent bottlenecks in any population, although Oyster Creek and Ham Island populations manifested historical bottlenecks. Our evidence supports that genetic recovery was already underway a year after Sandy.</span></p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103744"},"PeriodicalIF":1.8,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690503","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":"Arrival of the non-indigenous brown alga Mutimo cylindricus to the Atlantic Ocean","authors":"D. Álvarez-Canali ,&nbsp;M. Sansón ,&nbsp;A. Tronholm","doi":"10.1016/j.aquabot.2023.103745","DOIUrl":"10.1016/j.aquabot.2023.103745","url":null,"abstract":"<div><p>Every introduction of a non-indigenous species (NIS) in coastal environments poses a threat to the native species and communities, as its effects in the ecosystem are not readily predictable. Introduction rates have kept increasing in the last decades, and our finding of the brown alga <em>Mutimo cylindricus</em> in the Canary Islands is another example of this general trend. This work represents the first record of the species outside its native range (Japan, Korea and the Philippines) in half a century, since its report in 1973 in Baja California, and marks the first report of <em>M. cylindricus</em> in the Atlantic Ocean. We analyzed the morphology of a male gametophyte observed in the Canary Islands and its phylogenetic relationship with other known populations using <em>rbc</em>L and <em>cox</em>3 genes. The morphology of <em>M. cylindricus</em> in the Canary Islands is consistent with previous descriptions and the phylogenetic analyses revealed the close relationship with native populations from Japan. The finding of a male gametophyte is noteworthy, as introduced and some native populations of this species are composed exclusively by female gametophytes and thought to be parthenogenic, whereas androgenesis is considered rare in the field. Maritime traffic appears as the most apparent introduction vector of the species and it seems plausible that microscopic crustose sporophytes were present near the collecting site, highlighting the need of further monitoring of the invasive potential of this species in the Atlantic Ocean.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103745"},"PeriodicalIF":1.8,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377023001304/pdfft?md5=dbc566a626f125785933630fc3673a07&pid=1-s2.0-S0304377023001304-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690502","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":"Interaction of nutrient enrichment and farming method on performance of the red seaweed Kappaphycus alvarezii","authors":"Jubail S. Muyong ,&nbsp;Albaris B. Tahiluddin","doi":"10.1016/j.aquabot.2023.103743","DOIUrl":"10.1016/j.aquabot.2023.103743","url":null,"abstract":"<div><p><span>To meet the increasing demand for kappa carrageenan<span>, several strategies have been employed to improve eucheumatoid seaweed productivity, such as nutrient enrichment (NE) and the application of some efficient farming methods (FM). This study aims to investigate the interaction of NE (applied as ammonium phosphate at 3.5 g L</span></span>⁻¹) and farming method on the performance of the eucheumatoid seaweed <span><em>Kappaphycus alvarezii</em></span><span>. Three farming methods, that is, Sway (SW), Spring (SP), and modified fixed-off bottom (MFOB), were employed for nutrient-enriched (NE) and non-enriched control fronds for a period of 45 days. NE significantly improved the growth and carrageenan yield of the seaweed and afforded protection against the incidence of ice-ice disease; meanwhile, the effect of FM and NE-FM interaction was non-significant. NE increased the gel strength of the extracted carrageenan; meanwhile, SP farm led to the highest gel strength, followed by MFOB.</span></p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103743"},"PeriodicalIF":1.8,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138690212","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":"Global mitochondrial and chloroplast genome diversity in the threatened aquatic carnivorous plant Aldrovanda vesiculosa","authors":"Helena Štorchová ,&nbsp;Manuela Krüger ,&nbsp;Ian Small ,&nbsp;Lubomír Adamec ,&nbsp;Paul G. Nevill ,&nbsp;Katharine A. Howell ,&nbsp;Kingsley W. Dixon ,&nbsp;Mark Derbyshire ,&nbsp;Xiao Zhong ,&nbsp;Adam T. Cross","doi":"10.1016/j.aquabot.2023.103742","DOIUrl":"10.1016/j.aquabot.2023.103742","url":null,"abstract":"<div><p>The submerged aquatic carnivorous plant <em>Aldrovanda vesiculosa</em> (Droseraceae) is threatened by rapid deterioration of wetlands and oligotrophic lake habitats. Its native distribution spans four continents, but many historic populations are now extinct. Previous genetic studies found distinction between populations from Australia and those from the rest of the world, but due to limited genetic markers, neither detailed phylogenetic relationships nor the migration routes of <em>A. vesiculosa</em> populations were revealed. We used a de novo assembly of the <em>A. vesiculosa</em> mitochondrial genome and a previously published plastid genome as references for mapping short DNA sequence reads from 17 globally distributed populations. Phylogenetic trees were constructed based on detected polymorphisms. Genetic diversity of both the mitochondrial and plastid genome was low (Pi 0.55 × 10⁻⁴ and 0.7 × 10⁻⁴, respectively). Greater polymorphisms were found in the mitochondrial compared with the plastid genome, owing to its larger size (1.27 Mb). Australian populations formed a monophyletic clade in both plastid and mitochondrial trees, while the mitochondrial tree also distinguished populations from southern and northern Europe. <em>Aldrovanda vesiculosa</em> likely migrated to Australia and Africa from a southern European refuge during the last interglacial period∼100,000 years ago. When the last glaciation started, some populations could have survived in eastern Europe and moved north, when the continental glacier retreated. <em>Aldrovanda vesiculosa</em> experienced repeated population bottlenecks that reduced its genetic diversity.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103742"},"PeriodicalIF":1.8,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377023001274/pdfft?md5=7f5862b4aabb9d6d975a76b31cfc83ec&pid=1-s2.0-S0304377023001274-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138574212","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":"Sargassum species as hydrozoans substrates: Key patterns of association or just availability?","authors":"Cecilia Odette Carral-Murrieta ,&nbsp;Elisa Serviere-Zaragoza ,&nbsp;Francisco Rubén Castañeda Rivero ,&nbsp;Antonio C. Marques ,&nbsp;María A. Mendoza-Becerril","doi":"10.1016/j.aquabot.2023.103738","DOIUrl":"10.1016/j.aquabot.2023.103738","url":null,"abstract":"<div><p>The genus <span><em>Sargassum</em></span> comprises both benthic and holopelagic species, serving as basibionts for numerous marine organisms, including frequent epibiotic occurrences of hydrozoans (Cnidaria). Several aspects of the epibiotic interaction between hydrozoans and <em>Sargassum</em> species remain insufficiently explored. This includes patterns such as the hydrozoan community’s composition and abundance across sections and structures of <em>Sargassum</em><span>. To address these gaps, we conducted an investigation aiming to uncover potential differences in the species composition and abundance of hydrozoan epibionts on benthic and holopelagic </span><em>Sargassum</em> species (BSS and HSS, respectively) from the Atlantic and Pacific Oceans of Mexico. Additionally, we sought to characterize hydrozoan epibionts preferences for specific sections and structures of <em>Sargassum</em>. Our analysis identified 18 hydrozoan epibiont species on Sa<em>rgassum</em>, belonging to Leptothecata (88.9%) and anthoathecate (11.1%), with one new register for <em>Sargassum</em> species. Each <em>Sargassum</em> species harbored a distinct hydrozoan epibiont species with a marked higher mean total coverage. The total percentage coverage of hydrozoans on BSS exhibited less variability than HSS. The basal section of BSS hosted the highest number of species. Concerning <em>Sargassum</em><span> structures, a greater species richness was found on the axis and the blades. Our study also demonstrates that differences in hydrozoan species primarily depend on the geographical distribution of </span><em>Sargassum</em> species.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103738"},"PeriodicalIF":1.8,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138566927","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 search for hybrids between Myriophyllum sibiricum and M. spicatum (Haloragaceae) in North Eurasia allowed to clarify their morphological differences and distribution","authors":"Polina A. Volkova ,&nbsp;Maria O. Ivanova ,&nbsp;Alexander A. Bobrov","doi":"10.1016/j.aquabot.2023.103741","DOIUrl":"10.1016/j.aquabot.2023.103741","url":null,"abstract":"<div><p><span><em>Myriophyllum</em><em> sibiricum</em></span> and <em>M. spicatum</em><span> are sympatric in large part of their vast ranges in Eurasia and North America and have different habitat preferences only in East Europe and Siberia. Such absence of both geographic and ecological isolation should trigger extensive hybridization between these species that is indeed observed in North America. The hybrid could be reliably documented only with genetic markers, and in Eurasia this was done only in China. Using genetic markers (ITS2 region of nuclear ribosomal DNA and </span><em>trn</em>L<em>-trn</em><span>F intergenic spacer of cpDNA) we documented hybrids between </span><em>M. sibiricum</em> and <em>M. spicatum</em> on the North Asian Pacific islands with dynamic geological history and climate (Commander and the southern Kuril islands). The hybrid also originated in East Europe (Ivanovo Region) as a result of ecological isolation break due to rapid artificial habitat change. Using genetically verified material throughout temperate Eurasia we clarified morphological characters discriminating <em>M. sibiricum</em> and <em>M. spicatum</em> and, basing on them, refined the species distribution. For the first time we provide a full morphological characteristic of the hybrid between <em>M. sibiricum</em> and <em>M. spicatum</em> and suggest a name for it, <em>M.</em> × <em>hybridum</em>.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103741"},"PeriodicalIF":1.8,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138553854","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":"Fecundity and egg viability of Sargassum oligocystum Montagne, 1845 in Iligan Bay, Northern Mindanao, Philippines","authors":"Maria Lyn M. Magcanta-Mortos ,&nbsp;Wilfredo H. Uy ,&nbsp;Lovella R. Calala ,&nbsp;Venus E. Leopardas ,&nbsp;Danilo B. Largo","doi":"10.1016/j.aquabot.2023.103740","DOIUrl":"10.1016/j.aquabot.2023.103740","url":null,"abstract":"<div><p><span>Fertile thalli of </span><span><em>Sargassum</em><em> oligocystum</em></span> were collected from the intertidal area of Naawan, Misamis Oriental, in northern Mindanao, Philippines. The early development, fecundity, egg viability, and recruitment of <em>S. oligocystum</em> were studied to gain insights into the species' biology in preparation for its future ecological and commercial applications. The embryonic development of <em>S. oligocystum</em> followed almost the same pattern as other <em>Sargassum</em><span><span> species found in the literature: 1) the presence of unfertilized eight-nuclei eggs, 2) zygotes undergoing division into embryos after fertilization, and 3) the development of dense </span>rhizoids on embryos after 4–5 days from release. The fecundity of one thallus of </span><em>S. oligocystum</em> produced 0.5 million eggs and 746 ± 1.5 eggs per receptacle, with 94.72% viability of eggs developing rhizoids for attachment. Recruitment of zygotes ranged from 0.52 ind cm⁻² to 3.37 ind cm⁻², with clay bricks found to be the most suitable substrate with a significantly higher recruitment rate than nylon rope and plastic binder. The present study implies the high potential of producing <em>S. oligocystum</em><span> biomass through the mass production of seed stocks in the hatchery.</span></p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103740"},"PeriodicalIF":1.8,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138563355","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":"Carbon limitation and aluminium toxicity prevents dominance of Crassula helmsii on weakly buffered soils","authors":"J. van Doorn (Jelmer) ,&nbsp;E.C.H.E.T. Lucassen (Esther) ,&nbsp;M.I.J.T. van Roosmalen (Michael) ,&nbsp;A.J.P. Smolders (Fons)","doi":"10.1016/j.aquabot.2023.103737","DOIUrl":"https://doi.org/10.1016/j.aquabot.2023.103737","url":null,"abstract":"<div><p><span>Invasions of the aquatic weed </span><span><em>Crassula</em><em> helmsii</em></span> pose a serious threat to native vegetation of soft water lakes, which increases the need for understanding the factors that regulate the success or failure of <em>C. helmsii</em>. Creating favorable conditions for native species seems promising to control <em>C. helmsii</em>, as previous research indicated that <em>C. helmsii</em> is a poor (root) competitor. We studied the development of <em>C. helmsii</em> growing together with the native <em>Littorella uniflora</em> (biomass, cover, tissue nutrient composition) at two different calcareous poor soil types (organic/acid, mineral/buffered) and under two different water tables (not inundated, submerged) in a greenhouse experiment. We found that when growing under submerged conditions, <em>C. helmsii</em> coexisted with <em>L. uniflora</em> and other native species without becoming dominant due to carbon limitation in the water layer. In contrast, we found that <em>C. helmsii</em> can easily become dominant over <em>L. uniflora</em> when growing on desiccated buffered fen soils with moderate nutrient availability. On the acidic/organic soils, <em>C. helmsii</em> development was poor and die-off was observed under both water level treatments, probably induced due to aluminum toxicity under a low acidity. These results indicate that creating oligotrophic and carbon-poor conditions are required for controlling <em>C. helmsii</em><span>. Restoration measures can preferably be taken before the onset of the rainy season and/or be followed by maintenance of a temporal artificial high water table to stimulate carbon limitation. Liming more or less organic shores could alleviate aluminum toxicity under acidic conditions which can potentially stimulate the development of </span><em>C. helmsii.</em></p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103737"},"PeriodicalIF":1.8,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138490755","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":"Relationship between arsenic content and macroelements, microelements, and polysaccharides in Sargassum horridum (Ochrophyta, Phaeophyceae) in the Gulf of California, Mexico","authors":"Alejandra Mazariegos-Villarreal ,&nbsp;Elisa Serviere-Zaragoza ,&nbsp;Juan Manuel López-Vivas ,&nbsp;Yolanda Freile-Pelegrín ,&nbsp;Héctor Reyes-Bonilla ,&nbsp;Karla León-Cisneros ,&nbsp;Jobst Wurl ,&nbsp;Lia Celina Méndez-Rodríguez","doi":"10.1016/j.aquabot.2023.103730","DOIUrl":"https://doi.org/10.1016/j.aquabot.2023.103730","url":null,"abstract":"<div><p><span><em>Sargassum</em></span> species are known for their capacity to accumulate toxic elements, which may pose environmental risks and limit their use. Arsenic accumulation in <em>Sargassum</em> may vary in response to environmental and physiological conditions. Moreover, interactions between chemical elements may result in synergistic or antagonistic effects. This study determined the variability in the concentration of macroelements (N, P, K) and microelements (As, Cd, Pb, Cu, Zn, and Mn) through time and between growth stages in <em>Sargassum horridum</em><span> from a site adjacent to a phosphorite<span> deposit in the Gulf of California. A generalized linear model (GLM) was performed to assess the influence of other concurrent elements, polysaccharides (alginate and fucoidan), and their main functional groups (uronic acids and sulfate) on arsenic content. Elemental concentrations showed the following decreasing order: N &gt; K &gt; P &gt; Fe &gt; Mn &gt; Zn &gt; Cd &gt; As &gt; Cu &gt; Pb. Arsenic concentration was 4.33 ± 0.20 mg kg</span></span>^-1. Significant differences in element concentrations were found by month and growth stage. The main variables associated with arsenic accumulation in <em>S. horridum</em><span> were potassium, nitrogen, zinc, fucoidan, sulfate from fucoidan, and alginate. The implications of the arsenic, cadmium, and lead concentrations in </span><em>S. horridum</em> and its potential applications in food, feed, and agricultural contexts are discussed. This research sheds light on the dynamic nature of elements accumulation in <em>Sargassum,</em> emphasizing the need for a comprehensive and context-specific understanding of elemental variations within <em>Sargassum</em> for safe and responsible applications.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103730"},"PeriodicalIF":1.8,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138465951","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":"Genetic diversity and occupation strategy of Egeria najas (Hydrocharitaceae) in different habitats along the Upper Paraná River corridor","authors":"Léia Carolina Lucio ,&nbsp;Bárbara Scorsim ,&nbsp;Adrian Cesar da Silva ,&nbsp;Julia Naomi Morimoto de Carvalho ,&nbsp;Alessandra Valéria de Oliveira ,&nbsp;Karina Fidanza Rodrigues ,&nbsp;Sidinei Magela Thomaz ,&nbsp;Sônia Maria Alves Pinto Prioli ,&nbsp;Alberto José Prioli","doi":"10.1016/j.aquabot.2023.103729","DOIUrl":"10.1016/j.aquabot.2023.103729","url":null,"abstract":"<div><p><em>Egeria najas</em><span> is a submerged aquatic macrophyte native to South America, with high propagation in reservoirs and natural lakes, whose reproductive strategy is little known. Understanding the genetic diversity of macrophyte populations can provide important information about this species' dispersion and colonization strategies, and support management actions. We aimed to genetically characterize populations of </span><em>E. najas</em><span><span> that colonize reservoirs and natural aquatic habitats (in a floodplain) in the Upper Paraná River basin, using the molecular markers </span>ITS and </span><em>trnL-trnF</em>. The results showed the absence of genetic variation for the nuclear marker ITS and 13 distinct haplotypes for <em>trnL-trnF</em><span>. One of these haplotypes occurred in all habitats and 11 are unique haplotypes, of which 5 occurred in the Itaipu Reservoir and 6 in the floodplain. The null genetic diversity for the nuclear marker and the genetic homogeneity of the studied populations indicates that the reproduction of </span><em>E. najas</em><span> is mostly vegetative. The source of chloroplast marker haplotype variability may be somatic mutations<span>. The connectivity among aquatic environments associated with river flow favors the transport of aquatic macrophyte propagules to different habitats. In the case of </span></span><em>E. najas</em>, whose vegetative propagules regenerate easily, the frequency of migrations supports the low genetic variability observed in populations of the Upper Paraná. In addition, the ability to occupy new habitats and recolonize disturbed ones strongly indicates that <em>E. najas</em> populations follow the metapopulation dynamics.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103729"},"PeriodicalIF":1.8,"publicationDate":"2023-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135708810","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}