Aquatic Botany最新文献

{"title":"High density promotes the germination of the recalcitrant seeds of submerged macrophyte Vallisneria natans","authors":"Yutong He ,&nbsp;Lizhi Zhu ,&nbsp;Jiayu Sun ,&nbsp;Yuxin Chen ,&nbsp;Yu Cao","doi":"10.1016/j.aquabot.2024.103810","DOIUrl":"10.1016/j.aquabot.2024.103810","url":null,"abstract":"<div><p>Seed germination is a critical process in the seed life cycle, especially for annual submerged macrophytes <em>Vallisneria natans</em> which is a model species for the restoration of degraded shallow lakes. Fresh seeds of <em>V. natans</em> have a very high germination rate but with no significant responses to the aggregation effect; meanwhile, these recalcitrant seeds quickly lose seed viability under dry storage. This study aims to explore the response of seed germination of <em>V. natans</em> after dry storage to aggregation effect by several microcosm experiments. We observed that seed aggregation has a significant positive effect on germination, and among the seven experimental densities between 10 ∼ 640 seeds, higher seed densities resulted in significantly enhanced germination. In contrast, daily removal of germinated seeds led to a significant decrease in the overall germination rate, suggesting that germinated seeds may secrete chemicals that promote the germination of ungerminated seeds. However, further experiments indicated that ethylene and gibberellins had no noticeable impact on seed germination, which was consistent with additional experiment results from spectrophotometer and high-throughput targeted metabolomics. We concluded that the promoting effect of aggregation on the seed germination of <em>V. natans</em> may be an adaptation of this species to its natural habitat but detailed mechanisms warranted further study.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103810"},"PeriodicalIF":1.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048391","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":"First record of Ruppia brevipedunculata in Indonesia","authors":"Fery Kurniawan ,&nbsp;Akbar Ario Digdo ,&nbsp;Robba Fahrisy Darus ,&nbsp;Nurlita Putri Anggraini ,&nbsp;Meutia Samira Ismet ,&nbsp;Pramaditya Wicaksono ,&nbsp;Wawan Kiswara","doi":"10.1016/j.aquabot.2024.103806","DOIUrl":"10.1016/j.aquabot.2024.103806","url":null,"abstract":"<div><p>This paper presents the first records of the seagrass species <em>Ruppia brevipedunculata</em> Shuo Yu &amp; den Hartog in Indonesia, which has never been reported before. <em>R. brevipedunculata</em> from a coastal lagoon was identified based on morphological characters and phylogenetics. Indonesian <em>R. brevipedunculata</em> had four carpels and a short peduncle. These differentiated from <em>R. maritima</em>. A phylogenetic analysis of ITS and matK demonstrated the same cluster as <em>R. brevipedunculata.</em> That was clearly shown by the matK gene-marker. Biodiversity exploration and conservation efforts are needed to protect and preserve <em>R. brevipedunculata</em> and its habitat.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103806"},"PeriodicalIF":1.9,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142041285","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":"Low pH enhances germination of eelgrass (Zostera marina L.) seeds despite ubiquitous presence of Phytophthora gemini","authors":"Alyson Lowell ,&nbsp;Claudia E.L. Hill ,&nbsp;Sam Dupont ,&nbsp;Eduardo Infantes ,&nbsp;Kirti Ramesh ,&nbsp;Bradley Peterson ,&nbsp;Laura L. Govers ,&nbsp;T. Erin Cox","doi":"10.1016/j.aquabot.2024.103805","DOIUrl":"10.1016/j.aquabot.2024.103805","url":null,"abstract":"<div><p>Seagrasses are foundation species in coastal ecosystems promoting biodiversity and community structure. Future marine carbonate chemistry under ocean acidification may enhance seagrass physiology, but little is known about how reproductive ecology and disease will integrate into future ocean conditions. A novel pathogen, <em>Phytophthora gemini</em>, infects &gt;90 % of eelgrass, <em>Zostera marina,</em> surveyed in Northern Atlantic and Mediterranean populations reducing annual germination 6-fold<em>.</em> Our study investigated the combined effects of ocean acidification and <em>P. gemini</em> infection on germination of eelgrass seeds. We conducted a two-level factorial experiment crossing four pH levels (∆0, - ∆0.3, - ∆0.6, -∆0.9; relative to the average pH at the sampling site) with three infection levels (infected, non-infected, exposed) to determine germination rate and infection response. Prior to experimentation, flowering shoots were collected and held in flow-through seawater tanks where seeds ripened naturally. Once collected, seeds were held in copper sulfate solution (27.37 ± 1.57 ppt) and stored in darkness to mimic winter dormancy (4 °C). Before the start of the experiment, viable seeds were cultured on oomycete selective growth media to determine infection status. By the end of the experiment, 100 % of tested seeds, regardless of treatment, contained <em>P. gemini</em>. Germination rate significantly increased with decreased pH. Our findings indicate that <em>P. gemini</em> is not inhibited by ecologically relevant changes to carbonate chemistry and standard handling practices can result in effective and highly virulent disease transmission. These results confirm perennial populations of eelgrass are susceptible to infection and alerts conservationists to additional considerations necessary for successful eelgrass restoration.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103805"},"PeriodicalIF":1.9,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141998153","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":"Native and invaded-range surveys provide mixed support for enemy-release of Nymphoides peltata in the invaded range","authors":"Nathan E. Harms ,&nbsp;Matthew Purcell ,&nbsp;Sun-hee Hong ,&nbsp;Sonja Stutz ,&nbsp;Jialiang Zhang ,&nbsp;Megann Harlow ,&nbsp;Chenxi Liu ,&nbsp;Nicholas P. Tippery","doi":"10.1016/j.aquabot.2024.103803","DOIUrl":"10.1016/j.aquabot.2024.103803","url":null,"abstract":"<div><p>Natural or anthropogenic movement of plant species outside their historical ranges may result in exposure to new environmental conditions and a lack of natural enemies, thus promoting their establishment and spread into new areas. A biogeographical comparison of native and invasive populations can provide insight into the mechanisms of successful invasions and guide effective management strategies, such as biological control, by targeting plant traits that promote invasiveness. We studied the Eurasian aquatic plant, <em>Nymphoides peltata</em>, <em>in situ</em> in the native (China, Korea) and invaded (USA) ranges to determine whether there were differences in natural enemy attack rates (percent leaf damage, frequency of leaf herbivory or disease), productivity (plant cover, reproduction), and leaf traits (leaf elemental content, leaf toughness, dry matter content, specific leaf area) between areas. We also investigated whether there was evidence of a tradeoff between natural enemy attack and growth or reproduction, as would be predicted by invasion theory. Plant cover (23–29 % higher) and reproductive output (eight times more seeds / m²) were consistently higher in the invaded range. Leaf traits consistently differed between ranges, which we would expect if plants in the invaded range had fewer herbivores or other pests. The amount of leaf damage present was similar between ranges, but the frequency of herbivory was 50 % greater, on average, in the native than invaded range. Although we did not quantify suppression of <em>N. peltata</em> by natural enemies, we found evidence of more frequent herbivory in Asia and reduced reproduction and plant cover compared to the USA, which supports further investigation into viability of biological controls.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103803"},"PeriodicalIF":1.9,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141935488","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":"Eurasian watermilfoil (Myriophyllum spicatum) alters its root topology but conserves its root branching in response to freshwater cultural eutrophication","authors":"Xiaolong Huang ,&nbsp;Jing Lu ,&nbsp;Hu He ,&nbsp;Baohua Guan ,&nbsp;Jing Luo ,&nbsp;Jinlei Yu ,&nbsp;Zhigang Mao ,&nbsp;Kuanyi Li ,&nbsp;Erik Jeppesen","doi":"10.1016/j.aquabot.2024.103804","DOIUrl":"10.1016/j.aquabot.2024.103804","url":null,"abstract":"<div><p>Cultural eutrophication is the main cause of the decline of submerged plants in freshwater ecosystems. While many studies have focused on the nutrient uptake by the roots of these plants, less attention has been given to the effects of eutrophication on root structure. We designed a mesocosm experiment with Eurasian watermilfoil (<em>Myriophyllum spicatum</em>), a submerged plant indigenous to the Eurasian continent. The responses of plant functional traits, including growth traits, morphological traits and root topological indices, to different nitrogen (N) and phosphorus (P) concentrations were elucidated. We found that high P concentrations suppressed all the morphological traits and reduced the root topological traits, whereas N concentrations had a comparatively minor effect. Although the root branching of <em>M. spicatum</em> did not change, its root topology became more dichotomous with fewer exterior root links being formed in nutrient-rich habitats, and the root form changed from deep and thin to shallow and dense with increasing P concentrations. The root nutrient absorption ability of <em>M. spicatum</em> may decrease with cultural eutrophication, and this change most likely reduces its anchoring ability and increases its sensitivity to dislodge from the sediment if disturbed by hydraulic forces.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103804"},"PeriodicalIF":1.9,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141935489","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":"DNA barcoding and phylogenetic relationships of ecologically and commercially important seaweed species from the Azores (NE Atlantic)","authors":"Teresa Cerqueira ,&nbsp;Artur M.L. Oliveira ,&nbsp;Marco F.L. Lemos","doi":"10.1016/j.aquabot.2024.103793","DOIUrl":"10.1016/j.aquabot.2024.103793","url":null,"abstract":"<div><p>Marine natural resources are increasingly demanded to support the livelihoods and wellbeing of humans facing multiple and simultaneous crises across the planet. Seaweeds, in particular, are renowned sources of bioactive marine compounds used for various purposes, including human and animal nutrition, soil fertilization, and healthcare markets. DNA-based tools are being adopted in integrative taxonomy and ecological research, as well as to monitor the supply chain of commercially important species. This research provides novel insights into the population genetics, phylogenetic relationships, and haplotype network of six commercially significant seaweed species that are abundant in the Azores archipelago and currently traded for industrial applications. This study provides a detailed assessment of the genetic diversity of the red seaweeds <em>Asparagopsis armata, Asparagopsis taxiformis,</em> and <em>Pterocladiella capillacea</em>, and the brown seaweeds <em>Halopteris scoparia, Zonaria tournefortii,</em> and <em>Cystoseira pustulata,</em> contributing with 17 newly generated barcodes of COI, <em>rbc</em>L, and 28 S rDNA gene records from the Azores region to the reference databases. Understanding the species identification and population dynamics is critical for understanding species composition in biodiversity hotspots. This knowledge supports taxonomy, conservation, environmental protection, and the sustainable use of marine resources.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103793"},"PeriodicalIF":1.9,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377024000457/pdfft?md5=77c4fefb89e9f14e0864f2264a5a8701&pid=1-s2.0-S0304377024000457-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141843630","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":"A Letter to the Editor regarding the 2022 article “Range expansion of Marinomyxa marina, a phytomyxid parasite of the invasive seagrass Halophila stipulacea, to the Caribbean”","authors":"John S. Cassell","doi":"10.1016/j.aquabot.2024.103795","DOIUrl":"10.1016/j.aquabot.2024.103795","url":null,"abstract":"","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103795"},"PeriodicalIF":1.9,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141692035","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":"Toward a comprehensive phylogeny of North American bladderworts (Utricularia, Lentibulariaceae)","authors":"Nicholas P. Tippery ,&nbsp;James Moreland ,&nbsp;Theodore Wild ,&nbsp;Gregory J. Bugbee ,&nbsp;Summer E. Stebbins ,&nbsp;James G. Mickley ,&nbsp;Alan R. Franck ,&nbsp;Keir M. Wefferling ,&nbsp;Mark J. Warman","doi":"10.1016/j.aquabot.2024.103794","DOIUrl":"10.1016/j.aquabot.2024.103794","url":null,"abstract":"<div><p>Carnivorous plants in the genus <em>Utricularia</em> (bladderwort) are diverse and widespread, represented in North America primarily by free-floating aquatic species. In the Nearctic ecoregion, roughly corresponding to temperate North America, there are 20 species of <em>Utricularia</em>, comprising a small fraction of the approximately 270 species in the genus worldwide. However, despite their low number, the Nearctic species represent seven of the 18 taxonomic sections of <em>Utricularia</em>, a pattern that potentially reflects multiple ancestral dispersal events into North America. Most of the Nearctic bladderwort species are represented by DNA sequence data, yet there is no single genetic locus that has been sequenced for all species, and this has precluded a thorough evaluation of their phylogenetic relationships. In this study, we obtained DNA sequence data for genetic loci and species that had not been sequenced previously, to produce a fully sampled molecular phylogeny. The resulting phylogeny includes all species that occur in the USA and data from five DNA regions: one nuclear locus (internal transcribed spacer, ITS) and four plastid loci (<em>trnK/matK</em>, <em>rpl20-rps12</em>, <em>rps16</em>, and <em>trnL-trnF</em>). We recovered a close relationship between <em>U. inflata</em> and <em>U. radiata</em>, two species that both have aerenchymatous floral support structures, and which previously had not been sequenced for any of the same genetic loci. We also sequenced numerous <em>U. macrorhiza</em> individuals, and our data support the phylogenetic distinctness and molecular diagnosability of this species against <em>U. australis</em>, <em>U. tenuicaulis</em>, and <em>U. vulgaris</em>. Curiously, we discovered plants in Ohio, USA that were identified as <em>U. tenuicaulis</em> and <em>U. × neglecta</em> (= <em>U. tenuicaulis</em> × <em>U. vulgaris</em>), and these represent the first evidence of such plants being naturalized in North America. These previously overlooked species and hybrids highlight the importance of using DNA in plant surveys and the value of having a robust reference library of DNA sequences.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103794"},"PeriodicalIF":1.9,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141693940","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":"Monitoring drift and associated biodiversity of nearshore rafts of holopelagic Sargassum spp. in the Mexican Caribbean","authors":"Brigitta I. van Tussenbroek ,&nbsp;L. Verónica Monroy-Velázquez ,&nbsp;Dení Rodríguez ,&nbsp;L. Parmenio Suescún-Bolívar ,&nbsp;Patricia E. Thomé ,&nbsp;Daniel Cerqueda-García ,&nbsp;José Q. García-Maldonado ,&nbsp;Isis G. Martínez-López ,&nbsp;José Antonio López-Portillo ,&nbsp;M. Guadalupe Barba-Santos ,&nbsp;Miguel Angel Gómez-Reali ,&nbsp;J. Edgar Escalante-Mancera","doi":"10.1016/j.aquabot.2024.103792","DOIUrl":"10.1016/j.aquabot.2024.103792","url":null,"abstract":"<div><p>Recent recurrent inundations of holopelagic <em>Sargassum</em> species (sargasso) in the tropical North Atlantic warrant studies to increase our understanding of this phenomenon. We carried out a multidisciplinary study to determine the drift and associated biota of sargasso rafts in nearshore waters of a reef system in the Mexican Caribbean, during the 2020–2022 influx seasons. Home-designed trackable drifting buoys revealed notorious influence of winds stronger than 4–5 m s⁻¹ on the rafts´ displacement. At lower wind velocities, the drift was almost entirely determined by currents; local topography played a role in concentrating or dispersing the algae. Video cameras attached to the drifting buoys allowed for non-invasive identification of free-swimming ichthyofauna, recording low specific richness with a dominance of species of the Carangidae family. Sargasso associated biota was sampled with a dipnet. The small motile macrofauna was abundant and diverse, with a dominance of few species. Epibionts (epifauna and epiphytic algae) showed low specific diversity, while the microbial communities were dominated by (potentially pathogenic) <em>Vibro</em> spp. Small motile macrofauna was the only biota group with new records for the study region. Differences among sampling events were observed in the associated community; suggesting large inherent variability of the rafts´ biota. The information on wind, coastal hydrodynamics and topography on the displacement of the sargasso rafts will allow for better predictions of strandings, and information on associated non-native biota or dominant microbial species helped identify groups that should be closely monitored; thereby aiding in targeted management actions for mitigating the impacts of the inundations.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"195 ","pages":"Article 103792"},"PeriodicalIF":1.9,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377024000445/pdfft?md5=ae190265b142e19565662d2c27a36972&pid=1-s2.0-S0304377024000445-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141694656","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":"Laguncularia racemosa phenology and resilience near its northern limit along the eastern coast of the USA","authors":"Nisse A. Goldberg,&nbsp;John N. Heine","doi":"10.1016/j.aquabot.2024.103791","DOIUrl":"https://doi.org/10.1016/j.aquabot.2024.103791","url":null,"abstract":"<div><p>The phenology of <em>Laguncularia racemosa</em> (L.) Gaertn. (Combretaceae) was investigated from a population located near the species’ northeastern range limit in Florida. Height, leaf dimensions, and the number of flower buds, flowers, and propagules were recorded, on average, every 2–3 months from May 2021 to October 2023. Irradiance, temperature, and inundation depth were measured hourly with data loggers and compared among seasons and years. Although plant heights were negatively impacted by freeze events in 2022 due to defoliation, vertical growth rates were significantly greater following the freeze. Flower bud and flower production were observed during the summer months and differed among years with greater abundances in 2021. Propagules were recorded in summer and autumn with greater abundances in 2021 and 2022 than in 2023. Light intensity was unlikely to limit growth without a canopy of <em>L. racemosa</em>. Maximum inundation depths &gt; 1.2 m were recorded in autumn and winter when propagule dispersal was likely to occur. The greatest depth of 2.2 m was more than the tallest individual in the study and occurred when hurricanes coincided with extreme high tides. The <em>L. racemosa</em> population was resilient to freeze and flooding events suggesting that population densities may continue to increase in northeastern Florida marshes.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"194 ","pages":"Article 103791"},"PeriodicalIF":1.9,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539266","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}