Pub Date : 2025-03-26DOI: 10.1016/j.aquabot.2025.103886
M.S. Silpa , Amit Kumar , R. Giridharan , Prakash Sanjeevi
The seagrass genus Ruppia comprises eleven accepted species worldwide. In India, the genus is represented by a single species Ruppia maritima. However, recent studies indicated that the reported species of R. maritima in the Indo-Pacific region belongs to R. brevipedunculata. We have examined the specimen of Ruppia sp. from Pulicat Lake, India, and found that it belongs to R. brevipedunculata Shuo Yu & Hartog (2014) based on key morphological characters such as the short peduncle. Phylogenetic analysis of the maternal chloroplast maturase K (matK) gene and nuclear internal transcribed spacer (ITS) sequence ascertained the species identity as the specimen clustered with previously reported R. brevipedunculata.
{"title":"Integrative taxonomy reveals the presence of seagrass Ruppia brevipedunculata in India","authors":"M.S. Silpa , Amit Kumar , R. Giridharan , Prakash Sanjeevi","doi":"10.1016/j.aquabot.2025.103886","DOIUrl":"10.1016/j.aquabot.2025.103886","url":null,"abstract":"<div><div>The seagrass genus <em>Ruppia</em> comprises eleven accepted species worldwide. In India, the genus is represented by a single species <em>Ruppia maritima</em>. However, recent studies indicated that the reported species of <em>R. maritima</em> in the Indo-Pacific region belongs to <em>R. brevipedunculata</em>. We have examined the specimen of <em>Ruppia</em> sp. from Pulicat Lake, India, and found that it belongs to <em>R. brevipedunculata</em> Shuo Yu & Hartog (2014) based on key morphological characters such as the short peduncle. Phylogenetic analysis of the maternal chloroplast maturase K (matK) gene and nuclear internal transcribed spacer (ITS) sequence ascertained the species identity as the specimen clustered with previously reported <em>R. brevipedunculata.</em></div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103886"},"PeriodicalIF":1.9,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735184","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 : 2025-03-25DOI: 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":"2025-03-25","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 : 2025-03-24DOI: 10.1016/j.aquabot.2025.103885
Zi-Yang Xie , Zhi-Hang Liu , Xin-Yue Gu, Yuan-Yuan Qin, Yu-Ting Du, Jin Yan, Rui Zhang, Chao Si
Introduced plant invasion, heavy metal pollution, eutrophication, and rising water temperatures collectively pose complex and severe environmental problems in freshwater ecosystems. Further clarification is needed on how invasive plants respond to these combined environmental stresses. We investigated the response of Alternanthera philoxeroides, a common invasive plant species in China, to two levels of cadmium concentration (0 or 1 mg L−1 Cd2+), crossed with two levels of nutrient availability (0 or 10 mL L−1 concentrated nutrient solution) and two levels of water temperature treatments (25 or 35 ℃). The presence of cadmium significantly inhibited the overall growth of A. philoxeroides, while the high nutrient level increased its growth. Temperature did not affect overall growth but primarily influenced branch number. There were statistically significant interactions between nutrient availability and temperature for several of our measurements; however, such significant interactions were not observed in the other two-way interactions. Overall, the high temperature enhanced the benefits derived from the high nutrient availability on the performance of A. philoxeroides. The three-way interaction only affected root-shoot ratio. The findings suggest that the high water temperature may exacerbate outbreaks of this invasive plant, particularly in freshwater habitats with high nutrient levels.
外来植物入侵、重金属污染、富营养化和水温上升共同构成了淡水生态系统复杂而严峻的环境问题。入侵植物如何应对这些综合环境压力需要进一步澄清。本研究研究了中国常见入侵植物Alternanthera philoxeroides对2种镉浓度（0或1 mg L−1 Cd2+）、2种养分有效性（0或10 mL L−1浓营养液）和2种水温（25或35℃）处理的响应。镉的存在显著抑制了黄杨的整体生长，而高营养水平则促进了黄杨的生长。温度对整体生长没有影响，但主要影响分枝数。在我们的几项测量中，营养可利用性和温度之间存在统计学上显著的相互作用；然而，在其他双向相互作用中没有观察到这种显著的相互作用。总体而言，高温增强了高养分有效性对黄杨生长性能的影响。三向交互作用仅影响根冠比。研究结果表明，高水温可能加剧这种入侵植物的爆发，特别是在高营养水平的淡水栖息地。
{"title":"Responses of an invasive plant Alternanthera philoxeroides to cadmium, nutrient availability and water temperature","authors":"Zi-Yang Xie , Zhi-Hang Liu , Xin-Yue Gu, Yuan-Yuan Qin, Yu-Ting Du, Jin Yan, Rui Zhang, Chao Si","doi":"10.1016/j.aquabot.2025.103885","DOIUrl":"10.1016/j.aquabot.2025.103885","url":null,"abstract":"<div><div>Introduced plant invasion, heavy metal pollution, eutrophication, and rising water temperatures collectively pose complex and severe environmental problems in freshwater ecosystems. Further clarification is needed on how invasive plants respond to these combined environmental stresses. We investigated the response of <em>Alternanthera philoxeroides</em>, a common invasive plant species in China, to two levels of cadmium concentration (0 or 1 mg L<sup>−1</sup> Cd<sup>2+</sup>), crossed with two levels of nutrient availability (0 or 10 mL L<sup>−1</sup> concentrated nutrient solution) and two levels of water temperature treatments (25 or 35 ℃). The presence of cadmium significantly inhibited the overall growth of <em>A. philoxeroides</em>, while the high nutrient level increased its growth. Temperature did not affect overall growth but primarily influenced branch number. There were statistically significant interactions between nutrient availability and temperature for several of our measurements; however, such significant interactions were not observed in the other two-way interactions. Overall, the high temperature enhanced the benefits derived from the high nutrient availability on the performance of <em>A. philoxeroides</em>. The three-way interaction only affected root-shoot ratio. The findings suggest that the high water temperature may exacerbate outbreaks of this invasive plant, particularly in freshwater habitats with high nutrient levels.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"199 ","pages":"Article 103885"},"PeriodicalIF":1.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706216","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 : 2025-03-21DOI: 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}
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