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Species identification and pollination biology of an economically important true halophyte, Salicornia brachiata Roxb. 具有重要经济价值的真卤植物 Salicornia brachiata Roxb.
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-10-16 DOI: 10.1016/j.aquabot.2024.103827
Kalmi Siridewa , Wasana De Silva , R.M.C.S. Ratnayake , Siril Wijesundara , Dinum Perera , Renuka N. Attanayake
{"title":"Species identification and pollination biology of an economically important true halophyte, Salicornia brachiata Roxb.","authors":"Kalmi Siridewa ,&nbsp;Wasana De Silva ,&nbsp;R.M.C.S. Ratnayake ,&nbsp;Siril Wijesundara ,&nbsp;Dinum Perera ,&nbsp;Renuka N. Attanayake","doi":"10.1016/j.aquabot.2024.103827","DOIUrl":"10.1016/j.aquabot.2024.103827","url":null,"abstract":"<div><div>Members of the genus <em>Salicornia</em> have gained a global attraction due to their ability to thrive under high saline conditions and as potential candidates in saline agriculture. However, it has been a taxonomically challenging genus for decades since the members show plastic responses to extreme environmental conditions and due to incongruences between morphological and molecular identification methods. While only a handful of commercially grown <em>Salicornia</em> species are fully described, most of the species including <em>S. brachiata</em>, a native species in the Indian sub-continent, Myanmar, and Sri Lanka are poorly described. With the potentials in adapting <em>S. brachiata</em> in saline agriculture, the aim of this study was to establish a morphology and DNA barcode-based species delineation system and to study pollination biology for future crop improvement projects. Tentatively identified <em>S. brachiata</em> plant samples were collected from two populations in Sri Lanka and completely described. GenBank lacked authenticated barcode data for <em>S. brachiata</em> except for one chloroplast genome to which the matK sequence obtained in the present study matched with 100 % identity. For the first time, well defined sequences of three barcode regions, ITS, ETS and matK, of <em>S. brachiata</em> were made available for accurate species identification. Reproductive dynamics in different parts of the inflorescence was studied. A facultative xenogamous mating system was recorded for the first time in the genus and while the lower florets in the cladode showed a preference towards outcrossing, the upper florets displayed adaptations for selfing. Data could be effectively utilized in future <em>Salicornia</em> breeding programs.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103827"},"PeriodicalIF":1.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577842","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}
引用次数: 0
Expansion of Halophila stipulacea in parallel with declines of native seagrasses in the eastern Mediterranean Sea 在地中海东部本地海草减少的同时,浅海海草也在扩大
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-10-16 DOI: 10.1016/j.aquabot.2024.103829
Gidon Winters , Hung Manh Nguyen , Moran Kaminer
{"title":"Expansion of Halophila stipulacea in parallel with declines of native seagrasses in the eastern Mediterranean Sea","authors":"Gidon Winters ,&nbsp;Hung Manh Nguyen ,&nbsp;Moran Kaminer","doi":"10.1016/j.aquabot.2024.103829","DOIUrl":"10.1016/j.aquabot.2024.103829","url":null,"abstract":"<div><div>Seagrasses native to the Mediterranean Sea are anticipated to be adversely affected by climate warming, while the invasive tropical seagrass species <em>Halophila stipulacea</em> is projected to proliferate and alter the region's underwater seascape. Despite the significant implications of this transition, it is surprisingly rare to include <em>H. stipulacea</em> in long-term monitoring programs across the Mediterranean. In July 2023, we conducted a follow-up study at a seagrass meadow in Limassol, Cyprus, which in 2017 was home to two native seagrass species, <em>Cymodocea nodosa</em> and <em>Posidonia oceanica</em>, alongside the invasive <em>H. stipulacea</em>. We assessed the seagrass cover of all present species and examined the characteristics of the <em>H. stipulacea</em> meadow, comparing our findings with data from 2017. Our results indicated a total loss of both native seagrass species, while <em>H. stipulacea</em> nearly doubled its coverage and exhibited substantial increases in shoot density, as well as above- and below-ground biomasses. Although our study is limited in scope, it supports earlier predictions regarding the anticipated transformations in the eastern Mediterranean's underwater landscape. This study highlights the urgent need to incorporate <em>H. stipulacea</em> into long-term seagrass monitoring efforts in the Mediterranean.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103829"},"PeriodicalIF":1.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142533819","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}
引用次数: 0
Different rhodolith assemblages host distinct associated species but similar ecological groups: A case study in NW Mediterranean Sea 不同的菱锰矿石群栖息着不同的伴生物种,但具有相似的生态群:地中海西北部案例研究
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-10-10 DOI: 10.1016/j.aquabot.2024.103826
Carlo Nike Bianchi , Carla Morri
{"title":"Different rhodolith assemblages host distinct associated species but similar ecological groups: A case study in NW Mediterranean Sea","authors":"Carlo Nike Bianchi ,&nbsp;Carla Morri","doi":"10.1016/j.aquabot.2024.103826","DOIUrl":"10.1016/j.aquabot.2024.103826","url":null,"abstract":"<div><div>Rhodolith beds represent the most widespread and studied facies of the coastal detrital bottoms characterized by macroids of living encrusting organisms. In the Mediterranean Sea, four rhodolith facies have been described: i) boxwork rhodoliths; ii) maërl; iii) pralines; and iv) unattached Peyssonneliales. Although lists of species associated with Mediterranean rhodolith beds have been published, no comparison among the species associated with different rhodolith facies are available. This paper compares the species associated with the four above-mentioned rhodolith facies sampled in the Tuscan Archipelago (Italy). These facies shared most of the 12 rhodolith species identified (10 Corallinales and 2 calcified Peyssonneliales), but with different abundances. Only three associated species (out of 377) were common to all four rhodolith assemblages, which however were all characterized by the abundance of the ecological group of the species characteristic of the biocoenosis of the Coastal Detrital bottoms. Therefore, rhodolith facies were better described in terms of ecological groups rather than species composition. Similar studies in other sectors of the Mediterranean Sea are needed to generalize this result, and the comparative study of other macroid facies, namely coralliths and bryoliths, would also be of interest.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103826"},"PeriodicalIF":1.9,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445197","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}
引用次数: 0
A Pleistocene legacy of gene pools, ecodemes and admixtures of Stuckenia pectinata (L.) Börner as evidenced from microsatellites, complete chloroplast genomes and ribosomal RNA cistron (Europe, Africa) 从微卫星、完整叶绿体基因组和核糖体 RNA cistron(欧洲、非洲)证明的 Stuckenia pectinata (L.) Börner 的更新世基因库、生态模式和混合物遗产
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-10-10 DOI: 10.1016/j.aquabot.2024.103825
Ludwig Triest , Laura Bossaer , Abebe Beyene Hailu , Helle Mäemets , Taita Terer , Viktor R. Tóth , Tim Sierens
{"title":"A Pleistocene legacy of gene pools, ecodemes and admixtures of Stuckenia pectinata (L.) Börner as evidenced from microsatellites, complete chloroplast genomes and ribosomal RNA cistron (Europe, Africa)","authors":"Ludwig Triest ,&nbsp;Laura Bossaer ,&nbsp;Abebe Beyene Hailu ,&nbsp;Helle Mäemets ,&nbsp;Taita Terer ,&nbsp;Viktor R. Tóth ,&nbsp;Tim Sierens","doi":"10.1016/j.aquabot.2024.103825","DOIUrl":"10.1016/j.aquabot.2024.103825","url":null,"abstract":"<div><div><em>Stuckenia pectinata</em> (L.) Börner is a widely distributed submerged plant well-studied for its ecology, distribution, and molecular diversity. Globally, various genotypic lineages and hybrids of <em>Stuckenia</em> species have been identified using nuclear <em>rRNA</em> (<em>ITS</em>) and chloroplast sequences (notably <em>rpl20–5’rps12</em> and <em>trnT-trnL</em>). These studies have shown intraspecific variability in <em>S. pectinata</em>, with two gene pools (<em>'genotype 1a'</em> and <em>'1b'</em>) reported for Europe and Africa. Moreover, former isozyme research suggested distinct freshwater and brackish water gene pools. Therefore, our primary objective was to determine whether these ecodemes correspond to either <em>'genotype 1a'</em> or <em>'1b'</em>. Using fifteen nuclear microsatellite loci, complete chloroplast genome sequences (156,677 bp), and the rRNA cistron (7178 bp), we analyzed the genetic identity of 313 <em>S. pectinata</em> samples (representing 124 unique clones) from 12 populations in Europe and Africa. Chloroplast genomes of three African Rift lake populations corresponded to <em>‘genotype 1b’</em>, while those of nine European populations to <em>‘genotype 1a’</em>. Microsatellites also clearly distinguished <em>‘genotype 1a’</em> from <em>‘1b’</em> in an individual PCoA and STRUCTURE analysis, whereas incomplete homogenization of <em>5S-rRNA</em> sequences suggested either ongoing differentiation or intraspecific hybridization between <em>‘genotype 1a’</em> and <em>‘1b’</em>. Haplotype lineages, rRNA cistron mutations, and microsatellites revealed an additional subdivision within <em>‘genotype 1a’</em>, potentially distinguishing a freshwater gene pool from a brackish water one. Approximate Bayesian computation analyses using nuclear microsatellites supported a demographic expansion model and a time of divergence, for the African Rift lake populations as well as for the European freshwater and brackish water populations, dating back to the Late Pleistocene. Divergent chloroplast lineages appeared to be already present during the Last Glacial Maximum. <em>Stuckenia pectinata</em> from Lake Hora (Ethiopia), Lake Balaton (Hungary) and the Camargue (France) each harbored two distinct maternal haplotypes, from Selinunte (Italy) indicated F1 hybrids whereas from Lake Peipsi (Estonia), amongst others, showed incomplete rRNA homogenization. It is hypothesized that contemporary <em>S. pectinata</em> populations, especially in Europe, retained a legacy of ancient gene pool differentiation despite a history of hybridization, admixture, and chloroplast capture. It is recommended that studies on the ecology and reproductive strategies of this seemingly common and widespread species should take into account its genetic identity.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103825"},"PeriodicalIF":1.9,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433655","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}
引用次数: 0
Biological control alters competition between Pontederia crassipes Mart. (Pontederiaceae) and Salvinia minima Baker (Salviniales: Salviniaceae) in a eutrophic waterbody 生物控制改变了富营养化水体中 Pontederia crassipes Mart.(富营养化水体中的褐藻(Pontederia crassipes Mart.)和小叶沙文藻(Salvinia minima Baker)之间的竞争关系
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-10-10 DOI: 10.1016/j.aquabot.2024.103823
Tressia Chikodza , Martin P. Hill , David Kinsler , Julie A. Coetzee
{"title":"Biological control alters competition between Pontederia crassipes Mart. (Pontederiaceae) and Salvinia minima Baker (Salviniales: Salviniaceae) in a eutrophic waterbody","authors":"Tressia Chikodza ,&nbsp;Martin P. Hill ,&nbsp;David Kinsler ,&nbsp;Julie A. Coetzee","doi":"10.1016/j.aquabot.2024.103823","DOIUrl":"10.1016/j.aquabot.2024.103823","url":null,"abstract":"<div><div><em>Pontederia crassipes</em> remains a highly invasive weed globally, posing significant threats to aquatic ecosystems. <em>Megamelus scutellaris</em>, a biological control agent released in South Africa effectively manages this weed, even at eutrophic, and high-elevation cool sites. Biological control of <em>P. crassipes</em> at Hartbeespoort Dam, a hypertrophic system in South Africa plagued by nuisance macrophyte growth, was followed by the invasion of an aquatic fern, <em>Salvinia minima</em>. This study explains the population dynamics of <em>P. crassipes</em> and <em>S. minima</em> at Hartbeespoort Dam, as a function of <em>M. scutellaris</em> herbivory to <em>P. crassipes</em>. Competition and herbivory effects on both species were evaluated using an additive series analysis in mesocosms. Multiple regression analyses indicated that in the absence of herbivory on <em>P. crassipes</em>, its interspecific competition coefficient was 4 times greater than that of <em>S. minima</em>. The competitive vigour of <em>S. minima</em> more than doubled in the presence of herbivory on <em>P. crassipes</em>. Consequently, in the presence of the biological control agent, no statistically significant difference in interspecific competition for both species could be found. These results highlight how biological control of one species can alter the population dynamics between two competing species. While biological control of <em>S. minima</em> is under consideration in South Africa, in the absence of nutrient remediation, the system will remain vulnerable to further invasion.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103823"},"PeriodicalIF":1.9,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142442086","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}
引用次数: 0
Habitat requirements of Luronium natans (L.) Raf. in northern Belgium 比利时北部 Luronium natans (L.) Raf. 的生境要求
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-10-04 DOI: 10.1016/j.aquabot.2024.103824
An Leyssen, Luc Denys, Hans Van Calster
{"title":"Habitat requirements of Luronium natans (L.) Raf. in northern Belgium","authors":"An Leyssen,&nbsp;Luc Denys,&nbsp;Hans Van Calster","doi":"10.1016/j.aquabot.2024.103824","DOIUrl":"10.1016/j.aquabot.2024.103824","url":null,"abstract":"<div><div>We investigated the environmental range of <em>Luronium natans</em> populations in lower Belgium (Flanders) with particular focus on key factors influencing its population size and the interplay of nutrient availability and physical disturbances in determining its abundance. Soil calcium content and total phosphorus in the water layer were the only physical-chemical variables related to <em>L. natans</em> abundance. Physical water body and vegetation characteristics influenced population dynamics and incidence of reproductive strategies. The species has a ruderal character, and occurs early in vegetation succession or depends on regular physical disturbance events for prolonged presence. Presenting limited competitive abilities, especially in terms of light availability, the species is hindered by taller-growing vegetation. Large populations are typically associated with well-lit conditions. Its flexibility to switch between vegetative and generative reproduction strategies may be associated with nutrient and light conditions. The need for long-term monitoring to consider population dynamics and evaluate the effectiveness of conservation efforts is emphasized. Overall, our study provides further insight into the relation between abiotic conditions, population dynamics and conservation management and extends the basis for sustainable management of the remaining <em>L. natans</em> populations in Flanders and similar regions of Atlantic Europe.</div></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103824"},"PeriodicalIF":1.9,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427080","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}
引用次数: 0
Rare occurrence of only female flowers suggests a lack of sexual reproduction and potential clonality of the seagrass Halophila baillonii Asch. on the Pacific coast of Costa Rica 哥斯达黎加太平洋沿岸的海草 Halophila baillonii Asch.
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-09-19 DOI: 10.1016/j.aquabot.2024.103822
Jimena Samper-Villarreal
{"title":"Rare occurrence of only female flowers suggests a lack of sexual reproduction and potential clonality of the seagrass Halophila baillonii Asch. on the Pacific coast of Costa Rica","authors":"Jimena Samper-Villarreal","doi":"10.1016/j.aquabot.2024.103822","DOIUrl":"10.1016/j.aquabot.2024.103822","url":null,"abstract":"<div><p><em>Halophila baillonii</em> Asch. is a rare seagrass species found in the Caribbean, Atlantic, and Eastern Tropical Pacific (ETP). It is listed as Vulnerable in the IUCN Red List yet very little is known about its dispersal mechanisms. For this study, samples were collected at five sites on the Pacific coast of Costa Rica. Each site was visited once between 2019 and 2021 as part of a larger molecular study. At each site, <em>H. baillonii</em> foliar shoots were manually collected along three transects. Presence of flowers or fruits was assessed for 1292 foliar shoots using a dissecting microscope. Additionally, sediment samples were collected to assess seed density at three of the sites. Flowering frequency was very low overall (0.7 %), flowers were only found at two of the five sites, and only female flowers were present. There were no fruits or seeds at any of the sites. This is the first report of <em>H. baillonii</em> flowering on the Pacific coast of Costa Rica and within the ETP. Meanwhile, <em>H. baillonii</em> flowers of both sexes and fruits have been found from limited sampling efforts at multiple sites in the Caribbean and Brazil. The findings of this study suggest a lack of sexual reproduction and potential clonality of the seagrass <em>H. baillonii</em> on the Pacific coast of Costa Rica. This supports the recent notion that <em>H. baillonii</em> is the first non-native seagrass in the ETP, yet more detailed field and molecular studies are needed.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103822"},"PeriodicalIF":1.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377024000743/pdfft?md5=ed91f5e83edc70a386bc5af0a59df51a&pid=1-s2.0-S0304377024000743-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274326","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}
引用次数: 0
Carbon allocation dynamics of Spartina alterniflora in Georgia saltmarsh, USA 美国佐治亚盐沼中互花苋的碳分配动态
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-09-13 DOI: 10.1016/j.aquabot.2024.103821
Yeajin Jung , Adrian Burd
{"title":"Carbon allocation dynamics of Spartina alterniflora in Georgia saltmarsh, USA","authors":"Yeajin Jung ,&nbsp;Adrian Burd","doi":"10.1016/j.aquabot.2024.103821","DOIUrl":"10.1016/j.aquabot.2024.103821","url":null,"abstract":"<div><p>We developed a phenology-based growth model(PG model) for <em>Spartina alterniflora</em> that incorporates the effects of light, temperature, and salinity on plant production. The PG model is the first to quantify carbon translocation between both above- and below-ground biomass across three phenological periods: growth, senescence, and dormancy periods. This model, fitted to field data from short, medium, and tall <em>S. alterniflora</em> types, estimates physiological parameters such as mass-specific rates of carbon translocation. Once parameterized, the model is applied in forward mode to predict whole-plant production, growth, respiration, mortality, and translocation. Model results reveals that short forms allocate 82 % of photosynthate to below-ground biomass during the growing season, compared to tall (52 %) and medium (22 %) types. However, tall forms, with extensive above-ground biomass, show the highest absolute carbon translocation to below-ground tissues during growth(ave. 3940 g dry weight m<sup>−2</sup>) and senescence(ave. 265 g dry weight m<sup>−2</sup>) period. An average mortality rate of 52 % of net production in the tall form below-ground biomass throughout the year indicates a substantial contribution to organic carbon sequestration within the habitat sediment. Model results also reveal that the carbon translocation from below- to above-ground tissues may not be required for survival during winter in milder climate like Sapelo Island, Georgia.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103821"},"PeriodicalIF":1.9,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377024000731/pdfft?md5=9029a6ee9fae7cf7d9d3de0d03a3669c&pid=1-s2.0-S0304377024000731-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241242","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}
引用次数: 0
First record of the seagrass Halophila stipulacea (Forsskal) Ascherson in the waters of the continental United States (Key Biscayne, Florida) 美国大陆水域(佛罗里达州基比斯坎)首次记录到海草 Halophila stipulacea (Forsskal) Ascherson
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-09-10 DOI: 10.1016/j.aquabot.2024.103820
Justin E. Campbell , Aarin-Conrad Allen , Danielle C. Sattelberger , Matthew D. White , James W. Fourqurean
{"title":"First record of the seagrass Halophila stipulacea (Forsskal) Ascherson in the waters of the continental United States (Key Biscayne, Florida)","authors":"Justin E. Campbell ,&nbsp;Aarin-Conrad Allen ,&nbsp;Danielle C. Sattelberger ,&nbsp;Matthew D. White ,&nbsp;James W. Fourqurean","doi":"10.1016/j.aquabot.2024.103820","DOIUrl":"10.1016/j.aquabot.2024.103820","url":null,"abstract":"<div><p>The first record of <em>Halophila stipulacea</em> is reported for the continental waters of the United States. In August 2024, a small meadow was identified inside Crandon Marina on Key Biscayne, Florida, USA. Following surveys have revealed that <em>H. stipulacea</em> has spread to adjacent areas immediately outside of the marina, often growing either in close proximity to, or interspersed with, the native seagrasses <em>Thalassia testudinum</em>, <em>Syringodium filiforme</em>, and <em>Halodule wrightii</em>. This serves as an initial report and extends the geographic scope of this introduced species in the Western Atlantic basin.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103820"},"PeriodicalIF":1.9,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S030437702400072X/pdfft?md5=666afc8091c4c02cd271008071c84876&pid=1-s2.0-S030437702400072X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142172949","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}
引用次数: 0
Iron co-limitation of Sargassum fluitans 马尾藻的铁协同限制
IF 1.9 4区 生物学
Aquatic Botany Pub Date : 2024-09-06 DOI: 10.1016/j.aquabot.2024.103807
Luuk Leemans , Eden Magaña-Gallegos , Marieke M. van Katwijk , Leon P.M. Lamers , Alfons J.P. Smolders , Tjeerd J. Bouma , Marjolijn J.A. Christianen , Brigitta I. van Tussenbroek
{"title":"Iron co-limitation of Sargassum fluitans","authors":"Luuk Leemans ,&nbsp;Eden Magaña-Gallegos ,&nbsp;Marieke M. van Katwijk ,&nbsp;Leon P.M. Lamers ,&nbsp;Alfons J.P. Smolders ,&nbsp;Tjeerd J. Bouma ,&nbsp;Marjolijn J.A. Christianen ,&nbsp;Brigitta I. van Tussenbroek","doi":"10.1016/j.aquabot.2024.103807","DOIUrl":"10.1016/j.aquabot.2024.103807","url":null,"abstract":"<div><p>In recent years, global distribution of holopelagic <em>Sargassum</em> spp. (sargassum) has extended from the subtropical Sargasso Sea and Gulf of Mexico into the tropical Atlantic. Climate and current patterns drive seasonal and year-to-year fluctuations of biomass in the ocean, but the underlying drivers of sargassum growth are poorly understood. Previous experimental studies showed that nitrogen (N) and phosphorus (P) can be limiting to sargassum. However, iron (Fe) also limits primary production in large parts of the ocean. We therefore (1) conducted a mesocosm experiment studying the effects of N+P and Fe addition on the growth rate and nutrient content of <em>Sargassum fluitans</em>, and (2) compiled literature on Fe tissue levels in sargassum throughout its distribution area. The Fe levels in collected experimental specimens (Mexican Caribbean) were like those previously reported near coastlines with low terrestrial nutrient runoff, and in the open ocean. The addition of Fe greatly boosted growth, averaging 0.13 doublings day<sup>−1</sup>, 40 % faster than our controls, and maximum growth rate (doubling biomass in 5½d) was 46 % above previously reported maximal value. While oceanic Fe is relatively abundant in the tropical North Atlantic during rain episodes in the summers due to Saharan dust deposition, its availability is likely more limiting during other parts of the year, particularly in the western Caribbean. However, the true limiting potential of Fe depends on many factors. Our study suggests Fe co-limitation might occur widely and urges to include Fe availability in future sargassum forecasting models.</p></div>","PeriodicalId":8273,"journal":{"name":"Aquatic Botany","volume":"196 ","pages":"Article 103807"},"PeriodicalIF":1.9,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0304377024000597/pdfft?md5=663dca8de14bd0781e52c21a316a6f5e&pid=1-s2.0-S0304377024000597-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142163815","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}
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