Pub Date : 2025-03-21DOI: 10.1016/j.aquabot.2025.103882
Allyson Girard, Sebastian Rubiano-Rincon, Amanda Burton, Patrick D. Larkin
Genetic, including genotypic, diversity is positively associated with traits important for the maintenance of seagrass populations, while clonal reproduction has been shown to be correlated with an increased probability of survival, especially in stressful environments. We performed a pilot study to investigate the relationship between the intrusion of hydrogen sulfide (“sulfide”), an environmental phytotoxin, with genotypic diversity and clone size in the seagrass Halodule wrightii. Isotope ratio mass spectrometry (IRMS) was used to collect sulfur isotopic (δ34S) data to measure sulfide intrusion in 143 root, rhizome, and leaf tissue samples from three sites in the western Gulf of Mexico. A series of microsatellite markers and gridded coordinates were used for genotyping, clonal type (single- vs multi-ramet) and size estimation. While individual genotypes varied for sulfide intrusion, multi-way ANOVA identified location to be a more important factor. Environmental attributes appear to have a more significant role than genotypic identity, clonal type, or size for sulfide uptake and distribution in this species.
{"title":"An assessment of sulfide intrusion, genotypic diversity, and clone size in the seagrass Halodule wrightii","authors":"Allyson Girard, Sebastian Rubiano-Rincon, Amanda Burton, Patrick D. Larkin","doi":"10.1016/j.aquabot.2025.103882","DOIUrl":"10.1016/j.aquabot.2025.103882","url":null,"abstract":"<div><div>Genetic, including genotypic, diversity is positively associated with traits important for the maintenance of seagrass populations, while clonal reproduction has been shown to be correlated with an increased probability of survival, especially in stressful environments. We performed a pilot study to investigate the relationship between the intrusion of hydrogen sulfide (“sulfide”), an environmental phytotoxin, with genotypic diversity and clone size in the seagrass <em>Halodule wrightii</em>. Isotope ratio mass spectrometry (IRMS) was used to collect sulfur isotopic (δ<sup>34</sup>S) data to measure sulfide intrusion in 143 root, rhizome, and leaf tissue samples from three sites in the western Gulf of Mexico. A series of microsatellite markers and gridded coordinates were used for genotyping, clonal type (single- vs multi-ramet) and size estimation. While individual genotypes varied for sulfide intrusion, multi-way ANOVA identified location to be a more important factor. Environmental attributes appear to have a more significant role than genotypic identity, clonal type, or size for sulfide uptake and distribution in this species.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103882"},"PeriodicalIF":1.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706217","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 : 2025-03-13DOI: 10.1016/j.aquabot.2025.103883
A. Sakshi Rao, Swathi Pattigundla, Rama Ravi Teja Kosuri, Brajogopal Samanta
In the present study, we identified nine red algal species from the intertidal rocky shore of the Visakhapatnam coast, Bay of Bengal, India, using an integrated taxonomic approach, including morphological, anatomical, and multigene phylogenetic analyses based on SSU rDNA, rbcL, and COI gene markers. Seven of them were the new records to the study area, including Centroceras gasparrinii, Gelidium nayaritense, Pterocladiella bartlettii, Hypnea charoides, Hypnea cf. edeniana, Gracilaria multifurcata, and Gracilaria rangiferina. Of these seven species, P. bartlettii, G. multifurcata, and G. rangiferina were new records to the Bay of Bengal coast, whereas H. cf. edeniana and G. nayaritense were new records to the Indian Ocean. Our result suggested that red algal species cataloging is still under-representation in the study area. In the future, systematic sampling strategies from different tidal zones across different times of the year may report more new records and new species of red algae from this coastline.
{"title":"New records of red algae (Rhodophyta) from the intertidal rocky shore of Visakhapatnam coast of Bay of Bengal, India","authors":"A. Sakshi Rao, Swathi Pattigundla, Rama Ravi Teja Kosuri, Brajogopal Samanta","doi":"10.1016/j.aquabot.2025.103883","DOIUrl":"10.1016/j.aquabot.2025.103883","url":null,"abstract":"<div><div>In the present study, we identified nine red algal species from the intertidal rocky shore of the Visakhapatnam coast, Bay of Bengal, India, using an integrated taxonomic approach, including morphological, anatomical, and multigene phylogenetic analyses based on SSU rDNA, <em>rbc</em>L, and COI gene markers. Seven of them were the new records to the study area, including <em>Centroceras gasparrinii, Gelidium nayaritense, Pterocladiella bartlettii, Hypnea charoides, Hypnea</em> cf. <em>edeniana, Gracilaria multifurcata, and Gracilaria rangiferina.</em> Of these seven species, <em>P. bartlettii</em>, <em>G. multifurcata</em>, and <em>G. rangiferina</em> were new records to the Bay of Bengal coast, whereas <em>H.</em> cf. <em>edeniana</em> and <em>G. nayaritense</em> were new records to the Indian Ocean. Our result suggested that red algal species cataloging is still under-representation in the study area. In the future, systematic sampling strategies from different tidal zones across different times of the year may report more new records and new species of red algae from this coastline.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103883"},"PeriodicalIF":1.9,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687237","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 : 2025-03-10DOI: 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":"2025-03-10","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}
Mangrove restoration projects in Indonesia are widely conducted in abandoned aquaculture ponds, however the success of planting mangroves is limited as tidal flooding is often not considered. The hydrology of mangrove surrounding water is both complex and dynamic and creates tide-induced flow and mangrove vegetation interaction that influences hydrological suitability of mangrove species. In this study, we aimed to determine the hydrological suitability for specific mangrove species in mangrove restoration efforts in abandoned aquaculture ponds by measuring tidal inundation duration in mangrove waters. The study was undertaken in two restored mangroves sites in abandoned ponds in Perancak estuary, Bali and Lubuk Kertang, North Sumatra, which was combined with measurements of intact mangroves for comparison. Tidal flooding (inundation and current velocity) was recorded to obtain flooding period measurements (depth, duration and tidal velocity) in association with mangrove succession rates. We found that the variability of tidal flooding between study sites was found to determine dominant mangrove species, suggesting a mangrove species-specific tolerance to tidal flooding in establishing habitats. Among the species observed, Nypa fruticans was found to be the most resilient to prolonged tidal inundations. Rhizophora spp., Avicennia spp., Sonneratia alba, however, adapted to a wider range of inundation periods. The tidal inundation in restored mangrove ponds was characterized by low current velocities, which provides suitable conditions for mangrove recovery in restoration sites. This information on hydrological classification proves that the effectiveness of mangrove restoration projects can be improved by highlighting the necessity to account for localized tidal inundation regimes.
{"title":"Hydrological suitability for mangrove species in restored mangroves in abandoned ponds","authors":"Frida Sidik , Mohammad Basyuni , Novia Arinda Pradisty , Rizki Hanintyo , Nuryani Widagti , Bayu Priyono , Rizka Amelia , Paul Macklin , Nyoman Surana , Bejo Slamet","doi":"10.1016/j.aquabot.2025.103873","DOIUrl":"10.1016/j.aquabot.2025.103873","url":null,"abstract":"<div><div>Mangrove restoration projects in Indonesia are widely conducted in abandoned aquaculture ponds, however the success of planting mangroves is limited as tidal flooding is often not considered. The hydrology of mangrove surrounding water is both complex and dynamic and creates tide-induced flow and mangrove vegetation interaction that influences hydrological suitability of mangrove species. In this study, we aimed to determine the hydrological suitability for specific mangrove species in mangrove restoration efforts in abandoned aquaculture ponds by measuring tidal inundation duration in mangrove waters. The study was undertaken in two restored mangroves sites in abandoned ponds in Perancak estuary, Bali and Lubuk Kertang, North Sumatra, which was combined with measurements of intact mangroves for comparison. Tidal flooding (inundation and current velocity) was recorded to obtain flooding period measurements (depth, duration and tidal velocity) in association with mangrove succession rates. We found that the variability of tidal flooding between study sites was found to determine dominant mangrove species, suggesting a mangrove species-specific tolerance to tidal flooding in establishing habitats. Among the species observed, <em>Nypa fruticans</em> was found to be the most resilient to prolonged tidal inundations. <em>Rhizophora</em> spp<em>., Avicennia</em> spp., <em>Sonneratia alba</em>, however, adapted to a wider range of inundation periods. The tidal inundation in restored mangrove ponds was characterized by low current velocities, which provides suitable conditions for mangrove recovery in restoration sites. This information on hydrological classification proves that the effectiveness of mangrove restoration projects can be improved by highlighting the necessity to account for localized tidal inundation regimes.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103873"},"PeriodicalIF":1.9,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562725","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 : 2025-02-10DOI: 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":"2025-02-10","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 : 2025-02-07DOI: 10.1016/j.aquabot.2025.103870
Ying Wang, Dong-Ying Yan, Zhi-Zhong Li
Myriophyllum, a representative submerged genus within the family Haloragaceae, serves as a key material for investigating terrestrial-to-aquatic evolutionary transitions. Despite its ecological significance, studies on the mitogenome of this genus remain limited. In this study, we utilized HiFi sequencing data of M. ussuriense to assemble into circular mitogenome and plastome, measuring 765,982 bp and 158,484 bp, respectively. A total of 234 SSRs and 367 long dispersed repeats were identified, which likely contributed to the mitogenome expansion relative to other Saxifragales species. Furthermore, 23 mitochondrial-to-plastid transfer sequences (MTPTs) were detected, potentially driven by the abundance of long dispersed repeats. Compared to terrestrial plants within Saxifragales, the M. ussuriense mitogenome displayed a significantly reduced number of RNA editing sites (215), possibly reflecting the stability of aquatic environments. However, three nad genes (nad1, nad4, and nad7) exhibited an increased number of RNA editing sites, likely supporting adaptation to hypoxic conditions. In addition, most mitochondrial protein-coding genes (PCGs) were subject to purifying selection, although positive selection signals were detected in ccmB and atp4, suggesting their involvement in aquatic adaptation. In conclusion, our findings will offer new insights into the mitogenomic characteristics and aquatic adaptation of Myriophyllum, providing a valuable foundation for further evolutionary and ecological studies.
{"title":"First report on the mitogenome of the aquatic plant Myriophyllum ussuriense in Haloragaceae and its implications for aquatic adaptation","authors":"Ying Wang, Dong-Ying Yan, Zhi-Zhong Li","doi":"10.1016/j.aquabot.2025.103870","DOIUrl":"10.1016/j.aquabot.2025.103870","url":null,"abstract":"<div><div><em>Myriophyllum</em>, a representative submerged genus within the family Haloragaceae, serves as a key material for investigating terrestrial-to-aquatic evolutionary transitions. Despite its ecological significance, studies on the mitogenome of this genus remain limited. In this study, we utilized HiFi sequencing data of <em>M. ussuriense</em> to assemble into circular mitogenome and plastome, measuring 765,982 bp and 158,484 bp, respectively. A total of 234 SSRs and 367 long dispersed repeats were identified, which likely contributed to the mitogenome expansion relative to other Saxifragales species. Furthermore, 23 mitochondrial-to-plastid transfer sequences (MTPTs) were detected, potentially driven by the abundance of long dispersed repeats. Compared to terrestrial plants within Saxifragales, the <em>M. ussuriense</em> mitogenome displayed a significantly reduced number of RNA editing sites (215), possibly reflecting the stability of aquatic environments. However, three <em>nad</em> genes (<em>nad1</em>, <em>nad4</em>, and <em>nad7</em>) exhibited an increased number of RNA editing sites, likely supporting adaptation to hypoxic conditions. In addition, most mitochondrial protein-coding genes (PCGs) were subject to purifying selection, although positive selection signals were detected in <em>ccmB</em> and <em>atp4</em>, suggesting their involvement in aquatic adaptation. In conclusion, our findings will offer new insights into the mitogenomic characteristics and aquatic adaptation of <em>Myriophyllum</em>, providing a valuable foundation for further evolutionary and ecological studies.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103870"},"PeriodicalIF":1.9,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369654","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 : 2025-02-06DOI: 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":"2025-02-06","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}
Pub 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":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143321816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-17DOI: 10.1016/j.aquabot.2025.103868
Takashi Asaeda , Katharina Wilfert , Jonas Schoelynck
Submerged macrophytes in natural streams and stagnant waters are exposed to various abiotic stressors, including solar radiation, temperature fluctuations, and mechanical stress caused by water flow. During photosynthesis, carbohydrates are synthesized using electrons produced by absorbed solar radiation. However, surplus electrons, either due to excessive insufficient consumption, often caused by a lack of carbon dioxide (CO2) or inorganic carbon, can generate reactive oxygen species (ROS), leading to an increase in hydrogen peroxide (H2O2) concentrations. Consequently, the intensity of these stressors is often measured by the concentration of H2O2 in plant tissues. It's important to note that H2O2 production is not necessarily linked to a single stressor but can result from a combination of environmental factors. The primary objective of the tests was to determine how Myriophyllum spicatum responds to stress and produces H2O2 in reaction to flow patterns in streams and to high photosynthetically active radiation (PAR) in stagnant water. Observations were made at six stream sites. At each site, the flow velocity of the unidirectional mean flow (MV) and the turbulence velocity (TV) were measured within M. spicatum patches. In stagnant water, observations were conducted both in a moat where M. spicatum patches were located and in outdoor experimental tanks, where the plants were grown under controlled water temperatures and natural sunlight. Myriophyllum spicatum samples were collected alongside PAR measurements, and the H2O2 concentration in plant leaves was analyzed using the TiSO4 method. In streams, H₂O₂ concentrations were high in areas with very low turbulence. When turbulence reached sufficient levels, concentrations initially declined, then increased with further rising turbulence. In stagnant water, H₂O₂ concentrations, which were higher at elevated temperatures, increased proportionally with PAR intensity. In both scenarios, H₂O₂ levels decreased under extremely high stress, likely due to the deterioration of plant shoots. These results suggest that surplus electrons, arising from either limited electron consumption due to a restricted carbon source for synthesizing organic carbon or an excessive electron supply driven by strong PAR intensity, elevate H₂O₂ concentrations. However, with a sufficient carbon source available, H₂O₂ concentrations increase under heightened turbulence, likely as a result of mechanical stress.
{"title":"The identification of abiotic stress by hydrogen peroxide concentration in submerged macrophyte tissues","authors":"Takashi Asaeda , Katharina Wilfert , Jonas Schoelynck","doi":"10.1016/j.aquabot.2025.103868","DOIUrl":"10.1016/j.aquabot.2025.103868","url":null,"abstract":"<div><div>Submerged macrophytes in natural streams and stagnant waters are exposed to various abiotic stressors, including solar radiation, temperature fluctuations, and mechanical stress caused by water flow. During photosynthesis, carbohydrates are synthesized using electrons produced by absorbed solar radiation. However, surplus electrons, either due to excessive insufficient consumption, often caused by a lack of carbon dioxide (CO<sub>2</sub>) or inorganic carbon, can generate reactive oxygen species (ROS), leading to an increase in hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) concentrations. Consequently, the intensity of these stressors is often measured by the concentration of H<sub>2</sub>O<sub>2</sub> in plant tissues. It's important to note that H<sub>2</sub>O<sub>2</sub> production is not necessarily linked to a single stressor but can result from a combination of environmental factors. The primary objective of the tests was to determine how <em>Myriophyllum spicatum</em> responds to stress and produces H<sub>2</sub>O<sub>2</sub> in reaction to flow patterns in streams and to high photosynthetically active radiation (PAR) in stagnant water. Observations were made at six stream sites. At each site, the flow velocity of the unidirectional mean flow (MV) and the turbulence velocity (TV) were measured within <em>M. spicatum</em> patches. In stagnant water, observations were conducted both in a moat where <em>M. spicatum</em> patches were located and in outdoor experimental tanks, where the plants were grown under controlled water temperatures and natural sunlight. <em>Myriophyllum spicatum</em> samples were collected alongside PAR measurements, and the H<sub>2</sub>O<sub>2</sub> concentration in plant leaves was analyzed using the TiSO<sub>4</sub> method. In streams, H₂O₂ concentrations were high in areas with very low turbulence. When turbulence reached sufficient levels, concentrations initially declined, then increased with further rising turbulence. In stagnant water, H₂O₂ concentrations, which were higher at elevated temperatures, increased proportionally with PAR intensity. In both scenarios, H₂O₂ levels decreased under extremely high stress, likely due to the deterioration of plant shoots. These results suggest that surplus electrons, arising from either limited electron consumption due to a restricted carbon source for synthesizing organic carbon or an excessive electron supply driven by strong PAR intensity, elevate H₂O₂ concentrations. However, with a sufficient carbon source available, H₂O₂ concentrations increase under heightened turbulence, likely as a result of mechanical stress.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"198 ","pages":"Article 103868"},"PeriodicalIF":1.9,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub 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":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号