Pub Date : 2025-07-01Epub Date: 2025-03-25DOI: 10.1016/j.aquabot.2025.103884
Bruno Chávez-Vergara , Elizabeth Solleiro-Rebolledo , Rafael López-Martínez , Ofelia Beltrán-Paz , Águeda E. Ceniceros-Gómez , Germán Yañez-Mendoza
Low molecular organic compounds and nutrients are released during the natural breakdown of plant tissues. However, if the organisms accumulate potentially toxic elements (PTE), these can be released into the environment; this is a latent risk during the decomposition of sargassum litter. This topic has been studied only in ex-situ conditions. We quantified the PTE concentration in fresh and in situ naturally decomposed sargassum litter. The results indicated that only arsenic demonstrates a high concentration in fresh biomass and litter across different stages of decomposition, exceeding 65 % initially, but decreasing to less than 20 % in the later stage concerning total As in each decomposition phase. These findings offer valuable insights into the release of As in leachates during natural decay and the residual As in partially decomposed sargassum litter.
{"title":"The release of arsenic is a hidden risk during the in-situ decomposition of landed sargassum litter","authors":"Bruno Chávez-Vergara , Elizabeth Solleiro-Rebolledo , Rafael López-Martínez , Ofelia Beltrán-Paz , Águeda E. Ceniceros-Gómez , Germán Yañez-Mendoza","doi":"10.1016/j.aquabot.2025.103884","DOIUrl":"10.1016/j.aquabot.2025.103884","url":null,"abstract":"<div><div>Low molecular organic compounds and nutrients are released during the natural breakdown of plant tissues. However, if the organisms accumulate potentially toxic elements (PTE), these can be released into the environment; this is a latent risk during the decomposition of sargassum litter. This topic has been studied only in ex-situ conditions. We quantified the PTE concentration in fresh and in situ naturally decomposed sargassum litter. The results indicated that only arsenic demonstrates a high concentration in fresh biomass and litter across different stages of decomposition, exceeding 65 % initially, but decreasing to less than 20 % in the later stage concerning total As in each decomposition phase. These findings offer valuable insights into the release of As in leachates during natural decay and the residual As in partially decomposed sargassum litter.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103884"},"PeriodicalIF":1.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724566","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}
Pub Date : 2025-07-01Epub Date: 2025-02-10DOI: 10.1016/j.aquabot.2025.103872
Alexander V. Prazukin , Yuriy K. Firsov , Alexander A. Latushkin
Seagrasses establish highly productive ecosystems within shallow coastal regions of tropical and temperate seas and modify optical and hydrodynamic conditions with their canopies. This study aims to elucidate the vertical distributions of water temperature, photosynthetically active radiation (PAR), and water mobility within the canopy of Zostera noltei Hornemann 1832, in the Black Sea and correlate these findings with biomass distribution of the seagrass in the water column. In absence of significant directed water flow, Z. noltei exhibits a unimodal biomass distribution, peaking in the lower half of the canopy. This distribution, primarily dictated by the plant's morphology and growth dynamics, optimally aligns with PAR distribution across the canopy. Furthermore, diurnal assessments indicate variability in temperature and PAR intensity profiles within the Z. noltei canopy. Additionally, water mobility, assessed via plaster ball measurements, exhibits a parabolic decline with increasing canopy depth. The discussion emphasizes the modulatory role of seagrasses in these processes.
{"title":"Zostera noltei Hornemann seagrass as the modulator of habitat within its canopy","authors":"Alexander V. Prazukin , Yuriy K. Firsov , Alexander A. Latushkin","doi":"10.1016/j.aquabot.2025.103872","DOIUrl":"10.1016/j.aquabot.2025.103872","url":null,"abstract":"<div><div>Seagrasses establish highly productive ecosystems within shallow coastal regions of tropical and temperate seas and modify optical and hydrodynamic conditions with their canopies. This study aims to elucidate the vertical distributions of water temperature, photosynthetically active radiation (PAR), and water mobility within the canopy of <em>Zostera noltei</em> Hornemann 1832, in the Black Sea and correlate these findings with biomass distribution of the seagrass in the water column. In absence of significant directed water flow, <em>Z. noltei</em> exhibits a unimodal biomass distribution, peaking in the lower half of the canopy. This distribution, primarily dictated by the plant's morphology and growth dynamics, optimally aligns with PAR distribution across the canopy. Furthermore, diurnal assessments indicate variability in temperature and PAR intensity profiles within the <em>Z. noltei</em> canopy. Additionally, water mobility, assessed via plaster ball measurements, exhibits a parabolic decline with increasing canopy depth. The discussion emphasizes the modulatory role of seagrasses in these processes.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103872"},"PeriodicalIF":1.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437095","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}
Pub Date : 2025-07-01Epub Date: 2025-03-10DOI: 10.1016/j.aquabot.2025.103881
Duarte G. Frade , João Neiva , Jose Martínez-Garrido , Anne Davison , Luca Caminiti , Gonçalo G. Ramos , Gareth A. Pearson , Ester A. Serrão
Ruppia drepanensis Tineo ex Guss. is an important habitat-forming aquatic plant in saline and brackish Mediterranean wetlands. The species is declining in several parts of its range due to hydrological changes and habitat degradation. R. drepanensis was considered Critically Endangered, possibly Regionally Extinct in Portugal, due to not being observed since 1986 despite extensive surveys of suitable habitat. We report on a new population, the westernmost known record for the species in Europe, identified with morphological and molecular data. Despite being inside a protected area, this population occupies a single small pond adjacent to a road, making it vulnerable to habitat changes. Ex situ conservation is recommended, including seed banking and/or the establishment of new populations.
{"title":"Not regionally extinct: Rediscovery of Ruppia drepanensis in Portugal, the westernmost range edge in Europe","authors":"Duarte G. Frade , João Neiva , Jose Martínez-Garrido , Anne Davison , Luca Caminiti , Gonçalo G. Ramos , Gareth A. Pearson , Ester A. Serrão","doi":"10.1016/j.aquabot.2025.103881","DOIUrl":"10.1016/j.aquabot.2025.103881","url":null,"abstract":"<div><div><em>Ruppia drepanensis</em> Tineo ex Guss. is an important habitat-forming aquatic plant in saline and brackish Mediterranean wetlands. The species is declining in several parts of its range due to hydrological changes and habitat degradation. <em>R. drepanensis</em> was considered Critically Endangered, possibly Regionally Extinct in Portugal, due to not being observed since 1986 despite extensive surveys of suitable habitat. We report on a new population, the westernmost known record for the species in Europe, identified with morphological and molecular data. Despite being inside a protected area, this population occupies a single small pond adjacent to a road, making it vulnerable to habitat changes. Ex situ conservation is recommended, including seed banking and/or the establishment of new populations.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103881"},"PeriodicalIF":1.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592299","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}
Pub Date : 2025-05-01Epub Date: 2025-02-06DOI: 10.1016/j.aquabot.2025.103871
Guilherme Sampaio Cabral , Ronaldo Souza Silva , Francieli F. Bomfim , Leandro Juen , Lilian Casatti , Luciano Montag , Karina Dias-Silva , José Max Barbosa Oliveira-Junior , Thaisa Sala Michelan
Natural landscapes have been altered due to the increasing demand for natural resources, leading to changes in physicochemical characteristics and species composition of several systems, including the aquatic. This study identified the streams and species that contributed the most to macrophyte beta diversity within and surrounding the Amazon National Park. We also investigated the factors (local, spatial, and land-use) influencing the community structure. Biological and environmental data were obtained by field sampling in 29 streams (17 within the park and 12 outside). Land-use data were obtained by remote sensing (satellite imagery). The highest species contribution to beta diversity was observed in species with a high frequency of occurrence. The greater local contribution to beta diversity (LCBD) and the highest species richness were observed outside the park. Habitat integrity, fine substrate, and spatial components (i.e., geographic distance) negatively influenced LCBD, highlighting the effect of environmental filtering and dispersion processes on stream macrophytes. Land use variables did not significantly affect macrophytes LCBD. Our findings provide an important snapshot of how different factors (local, spatial, and land use changes) interact in determining macrophyte beta diversity in streams within and around the Amazon National Park. The study also underscores the importance of conservation units to preserve stream ecosystems' natural characteristics and habitat integrity.
{"title":"Macrophyte species uniqueness is driven by habitat integrity, sediment structure, and spatial components in streams around the Amazon National Park","authors":"Guilherme Sampaio Cabral , Ronaldo Souza Silva , Francieli F. Bomfim , Leandro Juen , Lilian Casatti , Luciano Montag , Karina Dias-Silva , José Max Barbosa Oliveira-Junior , Thaisa Sala Michelan","doi":"10.1016/j.aquabot.2025.103871","DOIUrl":"10.1016/j.aquabot.2025.103871","url":null,"abstract":"<div><div>Natural landscapes have been altered due to the increasing demand for natural resources, leading to changes in physicochemical characteristics and species composition of several systems, including the aquatic. This study identified the streams and species that contributed the most to macrophyte beta diversity within and surrounding the Amazon National Park. We also investigated the factors (local, spatial, and land-use) influencing the community structure. Biological and environmental data were obtained by field sampling in 29 streams (17 within the park and 12 outside). Land-use data were obtained by remote sensing (satellite imagery). The highest species contribution to beta diversity was observed in species with a high frequency of occurrence. The greater local contribution to beta diversity (LCBD) and the highest species richness were observed outside the park. Habitat integrity, fine substrate, and spatial components (i.e., geographic distance) negatively influenced LCBD, highlighting the effect of environmental filtering and dispersion processes on stream macrophytes. Land use variables did not significantly affect macrophytes LCBD. Our findings provide an important snapshot of how different factors (local, spatial, and land use changes) interact in determining macrophyte beta diversity in streams within and around the Amazon National Park. The study also underscores the importance of conservation units to preserve stream ecosystems' natural characteristics and habitat integrity.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103871"},"PeriodicalIF":1.9,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143321815","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}
Submerged macrophytes play a crucial role as primary producers and contribute essential ecosystem functions and services, but rising temperatures caused by climate change may alter their functional traits. We aimed to assess the effects of simulated climate warming (4.5 °C) on the functional trait responses of a submerged macrophyte, Stuckenia pectinata (L.) Börner, in a synchronized oligohaline (4 ppt salinity) mesocosm experiment conducted in two different climate regions in Turkey: cold semi-arid Ankara and hot, dry Mediterranean Mersin. The experiment was conducted using eight mesocosms at each site, with four replicates of each ambient temperature and warming treatment. Each mesocosm held 5000 L and was inoculated with natural sediment, plankton, macroinvertebrate and fish communities to represent natural oligohaline lake ecosystem. S. pectinata shoots collected from a single population from a coastal lake in Mersin were also inoculated in all mesocosms in similar abundances. Overall, we observed significant differences in macrophyte functional traits between the two sites with different climates, albeit with less pronounced effects of a 4.5 ºC rise in temperature within each site. Specifically, higher macrophyte percent volume infested (PVI) and canopy height were observed in the warmer Mersin than in the colder Ankara, which we attributed to higher shading by phytoplankton (reflected by water column Chlorophyll a, Chl-a). The biomass ratio (%dry weight (DW)/wet weight (WW)) was notably higher in Ankara, suggesting that the macrophytes in Ankara acquired relatively more resources than those in Mersin. The pronounced differences between the two sites likely reflected not only temperature differences but also cascading ecosystem characteristics (e.g., water column Chl-a, water nutrients) due to climatic differences.
{"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 , Gültekin Yılmaz , Cihelio Alves Amorim , Meltem Kuyumcu , Onat Arıkan , Mustafa Korkmaz , İrem Gamze Arık , Meryem Beklioğlu , Erik Jeppesen , 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":"2025-05-01","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}
Pub Date : 2025-05-01Epub Date: 2024-12-17DOI: 10.1016/j.aquabot.2024.103864
Daniela Glueck , Nina Feußner , Anne Herbst , Hendrik Schubert
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.
{"title":"Ecological consequences of breakwater and revetment structures on the Baltic Sea Coast in Germany","authors":"Daniela Glueck , Nina Feußner , Anne Herbst , 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":"2025-05-01","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}
Pyropia haitanensis, an economically and nutritionally significant marine crop, is extensively cultivated in China. This study employed genome skimming to assemble and annotate the chloroplast genome sequences of 15 different strains of P. haitanensis and conducted a comparative analysis of the chloroplast genome structure and characteristics. The assembled chloroplast genomes ranged in size from 195,577 to 201,312 base pairs (bp) and contained annotations for 253 (or 254 in some strains) genes associated with photosynthesis, transcription, biosynthesis and other essential processes. The number of simple repeat sequences (SSRs) varied between 28 and 30, with AT as the most abundant two-base repeat sequence. Despite overall conservation in the chloroplast genome structure, we identified eight highly variable regions that can serve as potential molecular markers for distinguishing different strains of P. haitanensis. These regions are eight intergenic spacer regions: petJ-carA, ORF32-ycf35, rbl35-pbsA, ORF68-accB, psbB-psbT, syh-groEL, ORF107-ycf12, rpl32-ORF263. Phylogenetic analysis indicates that the 15 strains mainly divide into three subgroups, suggesting a degree of genetic differentiation among them. Overall, this study not only contributed to the understanding of the genetic variation of P. haitanensis, but also offered valuable resources for future research, breeding efforts, and utilization of this economically important marine crop.
{"title":"Comparative analysis of the chloroplast genomes of different strains of Pyropia haitanensis","authors":"Hongzi Song , Zhicong Gao , Haimin Chen , 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":"2025-05-01","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}
Pub Date : 2025-05-01Epub Date: 2025-01-30DOI: 10.1016/j.aquabot.2025.103869
Brittany M. Chesser , Todd D. Sink
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.
{"title":"Information & education: Extension models used to manage aquatic vegetation in ponds","authors":"Brittany M. Chesser , 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":"2025-05-01","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}
Pub Date : 2025-05-01Epub Date: 2025-01-06DOI: 10.1016/j.aquabot.2025.103867
Neamat H. El-Tablawy , Olfat M.A. Salem , Lenka Štenclová , Jan Mareš , Arthur Yu. Nikulin , Maha Abdullah Alwaili , Fauzeya M. Albalwe , Amr Elkelish , Marco Cantonati , Abdullah A. Saber
As a part of our extensive survey on macroalgal distribution along the Egyptian-Mediterranean coasts, a green-tide-forming filamentous Ulva was collected from Alexandria city, and identified as Ulva tepida by a combined integrative approach, including a multilocus sequence dataset of the chloroplast–encoded rbcL 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 U. tepida, 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 U. tepida will be reported as an alien invasive species in other Mediterranean countries.
{"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 , Olfat M.A. Salem , Lenka Štenclová , Jan Mareš , Arthur Yu. Nikulin , Maha Abdullah Alwaili , Fauzeya M. Albalwe , Amr Elkelish , Marco Cantonati , 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":"2025-05-01","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}
Pub Date : 2025-05-01Epub Date: 2024-12-02DOI: 10.1016/j.aquabot.2024.103850
Maxim Yu. Grigoryan , Polina A. Volkova , Maria O. Ivanova , Olga A. Mochalova , Maria D. Logacheva , Tatyana V. Neretina , Alexander A. Bobrov
The genus Isoëtes is a unique group of lycophytes that offers valuable insights into plant evolution. However, taxonomic issues and evolutionary pathways within the genus require further study, particularly in North-East Asia, where only representatives of the I. echinospora complex occur. We studied genetic (nuclear DNA LFY2int and IBR3 regions, transcriptomes) and morphological (size and ornamentation of mega- and microspores, velum coverage) variability of Isoëtes populations, focusing on the Russian Far East. We found no clear genetic and morphological differentiation between European and North Asian populations of diploid I. echinospora s.l. (the latter was referred to as I. asiatica), not supporting treatment of I. asiatica as a separate species. The finding of samples with spiny papillate microspores in some North Asian populations of I. echinospora s.l. (neither differentiated by the other morphological characters, nor genetically) is of particular interest. Genetic analysis of the North Asian Pacific tetraploid I. maritima (initially referred to as I. beringensis) revealed its origin from diploid progenitors close to I. echinospora and North American I. bolanderi or I. howellii, as has been shown earlier for North American populations. This finding supports treatment of the North Asian and North American populations of I. maritima as one species, in line with their morphological similarity.
{"title":"No endemic Isoëtes (Isoëtaceae) species in the North Asian Pacific evidenced by genetic and morphological analysis","authors":"Maxim Yu. Grigoryan , Polina A. Volkova , Maria O. Ivanova , Olga A. Mochalova , Maria D. Logacheva , Tatyana V. Neretina , Alexander A. Bobrov","doi":"10.1016/j.aquabot.2024.103850","DOIUrl":"10.1016/j.aquabot.2024.103850","url":null,"abstract":"<div><div>The genus <em>Isoëtes</em> is a unique group of lycophytes that offers valuable insights into plant evolution. However, taxonomic issues and evolutionary pathways within the genus require further study, particularly in North-East Asia, where only representatives of the <em>I. echinospora</em> complex occur. We studied genetic (nuclear DNA LFY2int and IBR3 regions, transcriptomes) and morphological (size and ornamentation of mega- and microspores, velum coverage) variability of <em>Isoëtes</em> populations, focusing on the Russian Far East. We found no clear genetic and morphological differentiation between European and North Asian populations of diploid <em>I. echinospora</em> s.l. (the latter was referred to as <em>I. asiatica</em>), not supporting treatment of <em>I. asiatica</em> as a separate species. The finding of samples with spiny papillate microspores in some North Asian populations of <em>I. echinospora</em> s.l. (neither differentiated by the other morphological characters, nor genetically) is of particular interest. Genetic analysis of the North Asian Pacific tetraploid <em>I. maritima</em> (initially referred to as <em>I</em>. <em>beringensis</em>) revealed its origin from diploid progenitors close to <em>I. echinospora</em> and North American <em>I. bolanderi</em> or <em>I. howellii</em>, as has been shown earlier for North American populations. This finding supports treatment of the North Asian and North American populations of <em>I. maritima</em> as one species, in line with their morphological similarity.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103850"},"PeriodicalIF":1.9,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146472","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}
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