Aquatic Botany最新文献

{"title":"Allelopathic interactions between Lemna minor and Microcystis aeruginosa are influenced by the antimalarial drug lumefantrine","authors":"Suleiman Dauda ,&nbsp;Ejiroghene Ebelechukwu Uyovbisere ,&nbsp;Abdullahi Bala Alhassan ,&nbsp;Ramatu Idris Sha’aba ,&nbsp;Ibrahim Madu Katsallah Gadzama ,&nbsp;Maria Onma Onaji ,&nbsp;Mathias Ahii Chia","doi":"10.1016/j.aquabot.2024.103759","DOIUrl":"10.1016/j.aquabot.2024.103759","url":null,"abstract":"<div><p>The aquatic macrophyte <span><em>Lemna minor</em></span><span> and cyanobacterium </span><span><em>Microcystis aeruginosa</em></span><span> coexist and alternate in freshwater ecosystems<span>, and nutrient changes, physical conditions, and micropollutants such as pharmaceuticals drive their succession. However, the effects of the antimalarial drug Lumefantrine on allelopathic interactions have not been previously investigated. This study investigated the effect of Lumefantrine on the allelopathic interactions between </span></span><em>L. minor</em> and <em>M. aeruginosa</em>. The drug adversely affected pigment levels at 1000 µg L^-1 on day one, while the highest levels were observed at the same concentration on days three and five in <em>M. aeruginosa</em> cultures. The intracellular hydrogen peroxide (H₂O₂<span><span>) and lipid peroxidation (MDA) levels and </span>peroxidase<span> (POD) and glutathione S-transferase (GST) activity of </span></span><em>L. minor</em> and <em>M. aeruginosa</em><span> increased at varying degrees depending on the concentration of Lumefantrine. Increased concentrations of Lumefantrine induced higher microcystin content in </span><em>M. aeruginosa</em>. <em>L. minor</em> significantly decreased the growth and increased GST and POD activities of <em>M. aeruginosa</em> on day five of the assay. The introduction of Lumefantrine further altered these parameters when the species were co-cultured. Similarly, <em>M. aeruginosa</em> inhibited the growth of <em>L. minor</em>. The combination of <em>M. aeruginosa</em> and Lumefantrine increased GST activity compared with <em>M. aeruginosa</em> alone. Microcystin content was higher in co-cultures without Lumefantrine than in those exposed to the drug. These results show that allelopathic interactions between <em>L. minor</em> and <em>M. aeruginosa</em> are influenced by Lumefantrine and may have implications for managing freshwater ecosystems.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103759"},"PeriodicalIF":1.8,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139590045","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":"Mercury concentrations in macrophytes, periphyton, and detritus in the Everglades, Florida, USA, with special attention to Utricularia species","authors":"Mike Jerauld ,&nbsp;Jessica Vaccare ,&nbsp;Forrest Dierberg ,&nbsp;Nichole L. Carr ,&nbsp;Janelle Potts ,&nbsp;Thomas DeBusk","doi":"10.1016/j.aquabot.2024.103758","DOIUrl":"10.1016/j.aquabot.2024.103758","url":null,"abstract":"<div><p>Elevated mercury (Hg) levels in biota is one issue facing the Everglades ecosystem in south Florida, USA. Methylmercury (MeHg) is a concern in the environment because it bioaccumulates through the food web and can harm fauna and humans if ingested through contaminated food sources (e.g., fish). Total mercury (THg) and MeHg concentrations were measured in several common macrophyte species, periphyton, and detritus in the Everglades to investigate Hg concentrations spatially and among different ecosystem components. At each site, two species from the carnivorous genus <span><em>Utricularia</em></span>, <em>U. purpurea</em> and <em>U. foliosa</em>, which are widespread and abundant in Everglades sloughs, had much higher average tissue MeHg concentrations (2.4–81 ng/g dry weight [dw]) than all other sampled macrophytes (&lt;1.5–7.5 ng/g dw), periphyton (0.4–6.2 ng/g dw), and detritus (&lt;1.5–5.7 ng/g dw). The <em>Utricularia</em> species were likewise enriched with THg (14.6–115 ng/g dw) compared to the other macrophytes (2.6–27 ng/g dw), although slough detritus had the highest THg at most sites (24–182 ng/g dw). The <em>Utricularia</em> species generally had a higher average percent of THg as MeHg (8.2–75%) compared to the other macrophytes, periphyton, and detritus (0–32%). MeHg concentrations in <em>Utricularia</em> species were quite variable among sites with a spatial distribution that generally reflected historical Hg concentration patterns known in mosquitofish (<span><em>Gambusia holbrooki</em></span>). <em>Utricularia</em> species merit further investigation to understand how they accumulate relatively high MeHg concentrations and how they might influence Hg accumulation up the food web.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103758"},"PeriodicalIF":1.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139557843","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":"Modeling germination responses of three Mediterranean stem-succulent halophytes to salinity and temperature","authors":"Zaineb Hayder ,&nbsp;Mansour Sekrafi ,&nbsp;Abderrazak Tlili ,&nbsp;Fayçal Boughalleb ,&nbsp;Esmaeil Bakhshandeh ,&nbsp;Raoudha Abdellaoui ,&nbsp;Mohamed Tarhouni","doi":"10.1016/j.aquabot.2024.103757","DOIUrl":"10.1016/j.aquabot.2024.103757","url":null,"abstract":"<div><p><span>Population-based threshold models may aid in quantification of germination niches under stressful conditions such as salinity, temperature, and their interactions to understand seedling emergence patterns. Seeds of </span><span><em>Sarcocornia</em><em> fruticosa</em></span>, <em>Sarcocornia alpini</em>, and <span><em>Salicornia</em><em> emerici</em></span> were subjected to various temperatures at different NaCl concentrations. The median base NaCl concentration was roughly steady (0.68, 0.73, and 0.70 M, respectively) at sub-optimal temperatures, then decreased linearly at supra-optimal temperatures until the ceiling temperature. The estimated base, optimum and ceiling temperatures, in water, were –0.5, 15, and 29 °C for <span><em>Sarcocornia fruticosa</em></span>, –2.5, 11, and 24 °C for <em>Sarcocornia alpini</em>, and 9.5, 25, and 40 °C for <em>Salicornia emerici</em>, respectively. For all species, the base temperature did not change with the salinity, while both optimal and ceiling temperatures decreased. <em>S. emerici</em> showed rapid and synchronized germination when salinity decreased during the rainy season coinciding with favorable temperatures.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103757"},"PeriodicalIF":1.8,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139506907","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":"High water levels and low light co-inhibit colonization of fragments from the clonal invader Alternanthera philoxeroides","authors":"Haijie Zhang ,&nbsp;Bei Huang ,&nbsp;Yangting Huang ,&nbsp;Jian Liu","doi":"10.1016/j.aquabot.2024.103749","DOIUrl":"10.1016/j.aquabot.2024.103749","url":null,"abstract":"<div><p>Natural disturbances and human activities frequently fragment aquatic plants. Vegetative fragments of invasive clonal plants have a high capacity for colonization and regrowth, which results in rapid spreading of these plants. A case study was conducted to explore the effects of the water level and light on the colonization and regrowth of a clonal invasive plant – <em>Alternanthera philoxeroides</em>. In the study, the growth of 10-cm-long fragments of <em>A. philoxeroides</em> was followed in three water levels (0, 2, and 10 cm) and two light conditions (10% and 80% of natural light). Results showed that total biomass of <em>A. philoxeroides</em> under all treatments except 10% of natural light and 10 cm of water level was higher than the initial biomass, which suggested that fragments of <em>A. philoxeroides</em> can regrow under most conditions. However, treatments of high water levels and low light inhibited regrowth, clonal expansion, and vegetative propagation of clonal fragments by reducing their total biomass, number of nodes and storage root biomass. Creating habitats of high water levels and low light, for example, by planting native emergent aquatic plants, can hamper the spread of this clonal invader. Our study contributes a new perspective to controlling the spread of invasive clonal plants by creating habitats that inhibit the colonization of invasive plant propagules.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103749"},"PeriodicalIF":1.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377024000019/pdfft?md5=d8c91f7074c9e9972678d91e5c80a4f8&pid=1-s2.0-S0304377024000019-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139410639","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":"Effect of salinity stress on growth, chlorophyll, antioxidant enzymes and nutrient content in Azolla spp.","authors":"Hari Narayan ,&nbsp;Upendra Kumar ,&nbsp;Tapas Chowdhury ,&nbsp;P. Swain ,&nbsp;Madhusmita Barik ,&nbsp;AK Nayak","doi":"10.1016/j.aquabot.2024.103750","DOIUrl":"10.1016/j.aquabot.2024.103750","url":null,"abstract":"<div><p><span><em>Azolla</em></span><span> is an aquatic fern<span> that has a symbiotic association with nitrogen-fixing cyanobacteria. It is mainly used as a biofertilizer in rice; however, its potential under salt-affected rice cultivated area was compromised. Therefore, the present study was undertaken to understand the effect of salinity stress on morpho-physiological, biochemical characteristics, photosynthetic efficacy, nutrient and High Affinity Potassium Transporter (</span></span><em>HKT)</em> genes in <em>Azolla</em>. The results indicated that out of 102, 8 <em>Azolla</em> (<em>A. microphylla</em>, BLCC 5, BLCC 18, BLCC 28, Pa Car WTY, R 18, R 54 and R 59) were found tolerant to 80 mM NaCl. The best species for salt tolerant (80 mM NaCl) was <em>A. microphylla</em>, whereas the least-tolerant was <em>A. rubra.</em><span> Fresh biomass production<span>, frond length and width in </span></span><em>A. microphylla</em> were significantly (<em>p</em> &lt; 0.05) higher in <em>A. microphylla</em> than <em>A. rubra</em><span><span> in both 40 and 80 mM NaCl. Moreover, chlorophyll a/b ratio, carotenoids and </span>chlorophyll fluorescence (CHF)-derived F</span>_O, F_m, F_v/F_m and root architecture (root length, average root diameter, root volume, projectile and surface area) were higher in <em>A. microphylla</em> than <em>A. rubra</em> under 40 and 80 mM NaCl. Contents of Na⁺ and Ca²⁺ increased in both <em>A. microphylla</em> and <em>A. rubra</em>, which can interfere with the uptake of essential macronutrients; however, these were accumulated comparatively less in <em>A. microphylla</em> than <em>A. rubra</em>, whereas a reverse trend was observed in cellular accumulation of K⁺ content. <em>A. microphylla</em><span> had higher superoxide dismutase<span> (SOD), ascorbate peroxidase<span> (APX), and proline activities in 40 and 80 mM NaCl than </span></span></span><em>A. rubra</em><span>. For the first time, twenty six HKT primers were designed as a molecular marker to identify salt-tolerant </span><em>Azolla.</em> Out of these, three HKT primers (Req 6, Aeq14, and Aeq16) were amplified in <em>A. microphylla</em> under NaCl stress, while their amplifications were not observed in <em>A. rubra</em> (salt susceptible). In <em>A. microphylla</em>, the expression of the Req 6 (<em>HKT</em>) gene were more under NaCl stress. Moreover, further research is needed to discover and validate the biochemical and molecular processes that confer salinity tolerance in <em>Azolla</em> plants.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103750"},"PeriodicalIF":1.8,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139104799","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":"Bruguiera gymnorhiza forms mycorrhizal associations but Rhizophora stylosa does not: A pot experiment using mangrove soil and Rhizophoraceae seedlings","authors":"Yasuaki Akaji ,&nbsp;Tomomi Inoue ,&nbsp;Ayato Kohzu ,&nbsp;Takeshi Taniguchi ,&nbsp;Shigeyuki Baba","doi":"10.1016/j.aquabot.2023.103748","DOIUrl":"10.1016/j.aquabot.2023.103748","url":null,"abstract":"<div><p>Arbuscular mycorrhizal (AM) fungi often colonize the roots of mangrove plants, forming symbiotic associations with them, but colonization rates differ greatly among mangrove species. To examine differences in the colonization patterns of AM fungi, we focused on two species of mangroves (<span><em>Rhizophora stylosa</em></span> and <span><em>Bruguiera gymnorhiza</em></span><span>; Rhizophoraceae) and conducted a pot experiment using seedlings grown in mangrove soil watered with fresh water or brackish water (200 mM NaCl). We observed AM fungal structures such as hyphae, arbuscles, and vesicles in the roots of all </span><em>B. gymnorhiza</em><span> seedlings in the freshwater treatment, but rarely in the brackish water treatment. By contrast, we found no AM fungal structures in roots of any </span><em>R. stylosa</em> seedlings in either the freshwater or brackish water treatment. These results imply that <em>B. gymnorhiza</em> are facultatively mycorrhizal plants that have maintained the ability to form associations with AM fungi, whereas <em>R. stylosa</em>, which dominate habitats more seaward than those of <em>B. gymnorhiza</em>, may have lost the ability to form mycorrhizal associations through adaptation to extreme seaside conditions.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103748"},"PeriodicalIF":1.8,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139067722","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":"Effects on local oxygen conditions by the invasive macrophyte Myriophyllum spicatum","authors":"Ashley Hoblyn ,&nbsp;Lars Lønsmann Iversen","doi":"10.1016/j.aquabot.2023.103739","DOIUrl":"10.1016/j.aquabot.2023.103739","url":null,"abstract":"<div><p><span><em>Myriophyllum spicatum</em></span><span>, Eurasian watermilfoil, is a submerged aquatic plant invasive to North America. Several characteristics found in </span><em>M. spicatum</em><span><span> provide reasoning behind its invasion success such as its ability to spread and grow rapidly as well as displace other surrounding native species. However, Eurasian watermilfoil’s effects on ecosystem functioning (such as dissolved oxygen) and how such functioning differ from effects of native vegetation have seldom been studied. Using data collected in field, we used statistical models including Gaussian multivariate linear effect models and structural equation modelling (SEM), to investigate the effect of </span>vegetation type and cover on dissolved oxygen (DO) and temperature gradients. Here, we show that invasive Eurasian watermilfoil colonies, relative to native submerged vegetation, can have a direct effect on DO gradients. These changes in DO conditions were driven by both an increase in surface oxygen concentrations and a decrease in bottom layer oxygen concentration in dense </span><em>M. spicatum</em> vegetation. Furthermore, we find that the differences in DO gradients could be predicted from <em>M. spicatum</em>’s direct impact on oxygen concentration and not indirectly via its effects on water temperature. Our results demonstrate that dense colonies of <em>M. spicatum</em> can directly affect DO concentrations and may do so more than native macrophytes which could explain its rapid spread and potential impacts on ecosystem functioning.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103739"},"PeriodicalIF":1.8,"publicationDate":"2023-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139056414","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":"Hydroperiod modulates early growth and biomass partitioning in Rhizophora mangle L.","authors":"Julio A. Salas-Rabaza ,&nbsp;Casandra Reyes-García ,&nbsp;Rodrigo Méndez-Alonzo ,&nbsp;Roberth Us-Santamaría ,&nbsp;Samuel Flores-Mena ,&nbsp;José Luis Andrade","doi":"10.1016/j.aquabot.2023.103747","DOIUrl":"10.1016/j.aquabot.2023.103747","url":null,"abstract":"<div><p><span>In mangrove forests, the hydroperiod is strongly related to tidal dynamics, where the periodic oceanic water movement regulates the level, duration, and frequency of the flooding events. In fringe mangrove forests, </span><span><em>Rhizophora mangle</em></span> propagules deal with variable hydroperiod conditions that sometimes compromise their survival. To disentangle the combined effects of duration and intensity of flooding on physiological and growth variables, we imposed a continuous experiment with three levels of flooding and four flooding durations on seedlings of <em>R. mangle</em><span>. We collected data at 3 and 6.5 months after exposure to the treatments. Propagule reserves allowed plants to evade the effects of the flood level after a 3-month treatment period. After a 6.5-month exposure, physiology and growth were modulated by the flooding time. Individual plants had higher stem length and lower root and total biomass at prolonged and high flooding levels compared to any other flooding combinations. In both ages, the highest total plant biomass was exhibited in the medium flooding levels and 6 h flooding duration. The plasticity index was higher for morphological and biomass variables than for physiological variables. The high morphological plasticity of </span><em>R. mangle</em> plants constitutes a competitive advantage to colonize flooded sites in fringed mangrove areas. Our results identify schemes to improve the success of mangrove restoration plans, a critical tool for carbon sequestration and ecosystem service provision.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"191 ","pages":"Article 103747"},"PeriodicalIF":1.8,"publicationDate":"2023-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139027710","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":"Effects of seed traits and dormancy break treatments on germination of four aquatic plant species","authors":"Michael R. Verhoeven, Jonah A. Bacon, Daniel J. Larkin","doi":"10.1016/j.aquabot.2023.103746","DOIUrl":"https://doi.org/10.1016/j.aquabot.2023.103746","url":null,"abstract":"<p>Germination biology and dormancy-breaking requirements of fully aquatic (submerged and floating) plant species remain relatively understudied. This is a significant impediment to efforts to restore vegetation in freshwater systems, where the abundance of seeds, and possibility of sowing them in large numbers, suggests underutilized potential for active revegetation. We assessed the influence of seed traits (mass and shape) and two treatments to break dormancy (scarification and gibberellic acid) on the germination of seeds of four macrophyte species after cold-stratification. For all species, untreated seeds did not germinate (0% rate), despite relatively high seed viability (42-90% across species). For <em>Potamogeton illinoensis</em> and <em>P. natans</em>, scarification plus gibberellic acid increased germination the most, to 83% and 35%, respectively (corrected for viability). The other two species remained wholly (<em>Brasenia schreberi</em>) or overwhelmingly (<em>Nuphar variegata</em>) ungerminated. For the two species that did germinate, germination probability increased with seed mass (<em>P. natans</em> and <em>P. illinoensis</em>) and elongation (<em>P. natans</em>). While the small size of trait effects relative to seed treatment effects suggests the latter are more important for revegetation work, the trait patterns highlight evolutionary tradeoffs in seed-size investments. The two <em>Potamogeton</em> species we examined show promise for use in revegetation via seeding, whereas <em>B. schreberi</em> and <em>N. variegata</em> dormancy break has not been adequately developed for these species to be used in seeding-based revegetation.</p>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"80 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139027714","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":"Effects of seed traits and dormancy break treatments on germination of four aquatic plant species","authors":"Michael R. Verhoeven ,&nbsp;Jonah A. Bacon ,&nbsp;Daniel J. Larkin","doi":"10.1016/j.aquabot.2023.103746","DOIUrl":"10.1016/j.aquabot.2023.103746","url":null,"abstract":"<div><p>Germination biology and dormancy-breaking requirements of fully aquatic (submerged and floating) plant species remain relatively understudied. This is a significant impediment to efforts to restore vegetation in freshwater systems, where the abundance of seeds, and possibility of sowing them in large numbers, suggests underutilized potential for active revegetation. We assessed the influence of seed traits (mass and shape) and two treatments to break dormancy (scarification and gibberellic acid) on the germination of seeds of four macrophyte species after cold-stratification. For all species, untreated seeds did not germinate (0% rate), despite relatively high seed viability (42–90% across species). For <em>Potamogeton illinoensis</em> and <em>P. natans</em>, scarification plus gibberellic acid increased germination the most, to 83% and 35%, respectively (corrected for viability). The other two species remained wholly (<em>Brasenia schreberi</em>) or overwhelmingly (<em>Nuphar variegata</em>) ungerminated. For the two species that did germinate, germination probability increased with seed mass (<em>P. natans</em> and <em>P. illinoensis</em>) and elongation (<em>P. natans</em>). While the small size of trait effects relative to seed treatment effects suggests the latter are more important for revegetation work, the trait patterns highlight evolutionary tradeoffs in seed-size investments. The two <em>Potamogeton</em> species we examined show promise for use in revegetation via seeding, whereas <em>B. schreberi</em> and <em>N. variegata</em> dormancy break has not been adequately developed for these species to be used in seeding-based revegetation.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"192 ","pages":"Article 103746"},"PeriodicalIF":1.8,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377023001316/pdfft?md5=928fa215c81b5298b5fd0bf64ff226eb&pid=1-s2.0-S0304377023001316-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139015954","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}