Journal of Phycology最新文献_第2页

Polyculture of marine algae: Best combination for biomass, biochemical, and biodiesel properties. 海藻的混养：生物质、生化和生物柴油性能的最佳组合。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-22 DOI: 10.1111/jpy.70081

Saeid Vahdat, Farzaneh Noori, Gilbert Van Stappen, Naser Agh

{"title":"Polyculture of marine algae: Best combination for biomass, biochemical, and biodiesel properties.","authors":"Saeid Vahdat, Farzaneh Noori, Gilbert Van Stappen, Naser Agh","doi":"10.1111/jpy.70081","DOIUrl":"https://doi.org/10.1111/jpy.70081","url":null,"abstract":"Overyielding in polyculture systems suggests a potential for greater productivity than that observed in monocultures. Optimized algal polyculture combinations can significantly enhance biomass production and yield valuable biochemicals. The study tested seven different treatments of Nannochloropsis oculata, Chlorella sp., and Dunaliella tertiolecta in different ratios T1: (1:1:1), T2: (1:1:2), T3: (1:2:1), T4: (2:1:1), T5: (1:2:2), T6: (2:2:1), and T7: (2:1:2), respectively, under different photoperiods to assess the best combination for biomass, biochemical, and biodiesel properties. The results showed that under a 12:12 h light:dark photoperiod, T7 had the highest lipid and protein contents. There were also higher degrees of unsaturation in treatments 3, 6, and 7, whereas treatments 1, 2, and 4 had higher values for low carbon fuel standard and cold filter plugging point. Under a 16:8 h photoperiod, T3 had the highest total number of cells, T1 had the highest lipid level, and T3 had the highest protein level. Treatments 2 and 3 had significantly higher iodine values than the others, whereas T3 and T6 had higher cetane numbers. The results indicate that the highest protein and lipid levels were obtained in T3 under a 16:8 h photoperiod, whereas T1 had its highest protein and lipid levels during a 12:12 h photoperiod. Additionally, the highest biomass and mono-unsaturated fatty acids were observed in T3 under a 16:8 h photoperiod, and there were no significant differences in saponification values between treatments. Based on these findings, we recommend conducting algal polyculture with T3 (1:2:1) under a 16:8 h light:dark photoperiod to achieve optimal biomass production, higher protein, lipid, and mono-unsaturated fatty acid levels.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145113501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Four novel taxa of cyanobacteria from a unique thermal cave habitat in Vromoner Canyon, Albania. 来自阿尔巴尼亚弗罗莫纳峡谷一个独特的热洞穴栖息地的四个新的蓝藻分类群。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-12 DOI: 10.1111/jpy.70082

Jan Pokorný, Alžběta Vondrášková, Michaela Wipplingerová, Jan Kaštovský

{"title":"Four novel taxa of cyanobacteria from a unique thermal cave habitat in Vromoner Canyon, Albania.","authors":"Jan Pokorný, Alžběta Vondrášková, Michaela Wipplingerová, Jan Kaštovský","doi":"10.1111/jpy.70082","DOIUrl":"https://doi.org/10.1111/jpy.70082","url":null,"abstract":"Thermal and cave habitats on nearly all continents have been a substantial source of new cyanobacterial genotypes and morphotypes that expanded with the dawn of the era of molecular phylogenetics. In this study, we investigated the cyanobacterial flora of an extreme habitat of recently discovered caves with sulfur-rich thermal springs, using the polyphasic approach. The methods included cultivation, light and transmission electron microscopy, and molecular methods, including those that can be employed on samples that are not unialgal. Here, we present data on morphological and ultrastructural characteristics, 16S rRNA gene and 16S-23S internal transcribed spacer (ITS) rRNA region sequences, and folding structures. We identified one new trichal genus Xomosiella with the type species X. audyi forming a distinctly isolated clade and three new species in Loriellopsis, Mastigocladus, and Pegethrix. Apart from genetic distance, Xomosiella is distinguished from Limnothrix by its high trichome motility and benthic habitat, with granules likely composed of cyanophycin rather than aerotopes. The coccal cyanobacterium initially identified as \"Cyanosarcina\" sp. has been proposed as a new species, Loriellopsis vromonerensis, although its classification is complicated by morphological plasticity and phylogenetic uncertainties. The erection of Mastigocladus boudae was supported by a significant genetic divergence and distinct morphological characteristics. A description of a newly revealed cryptic species, Pegethrix sulphurea, has been provided. These results advance our knowledge of the diversity of cyanobacteria in extreme and understudied environments, which could enrich our understanding of microbial adaptability.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145040455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The effects of iron limitation on the small chlorophyte Micromonas from the Northeast Pacific Ocean. 铁限制对东北太平洋小绿单胞菌的影响。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-12 DOI: 10.1111/jpy.70079

Meredith G Meyer, Vincent J White, Olivia Torano, Heidi Hannoush, Margarita Lankford, Adrian Marchetti

{"title":"The effects of iron limitation on the small chlorophyte Micromonas from the Northeast Pacific Ocean.","authors":"Meredith G Meyer, Vincent J White, Olivia Torano, Heidi Hannoush, Margarita Lankford, Adrian Marchetti","doi":"10.1111/jpy.70079","DOIUrl":"https://doi.org/10.1111/jpy.70079","url":null,"abstract":"Small eukaryotic phytoplankton can account for a considerable amount of biomass and primary production in high nutrient, low chlorophyll (HNLC) regions of the ocean where iron limitation is pronounced. However, the physiological and metabolic strategies these cells invoke to cope under low iron conditions and the extent to which they are responsible for new production (i.e., the fraction of primary production supported by nutrients from outside of the euphotic zone) are unclear. Here, we examined how a representative picoeukaryote-the chlorophyte Micromonas sp., recently isolated from the iron-limited subarctic Northeast Pacific Ocean-responded to iron limitation when grown on nitrate as a nitrogen source. Iron-limited Micromonas exhibited reductions in growth rate, cell volume, and elemental quotas along with a restructuring of cellular metabolism. Gene expression and metabolic pathway analyses showed evidence of strategies to mitigate iron limitation with constitutive expression of genes related to nitrogen uptake and utilization. Additionally, cellular carbon and nitrogen quotas were 20-70 fmol C · cell-1 and 3.3-20 fmol N · cell-1, respectively, as a function of iron status. Based on the measured cellular quotas, we have estimated that representative picoeukaryotes (<2 μm), such as Micromonas, in HNLC Northeast Pacific waters can account for a significant proportion of new production, supporting the need for a reconsideration of the role small eukaryotic phytoplankton play in the global carbon cycle.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145040457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Finding Euastropsis Lagerheim (Chlorophyceae): Insights into morphological and genome evolution in the green algal family Hydrodictyaceae. 发现Lagerheim Euastropsis（绿藻科）：对绿藻家族Hydrodictyaceae的形态和基因组进化的见解。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-04 DOI: 10.1111/jpy.70073

Hilary A McManus, Kenneth G Karol, Joanna Lenarczyk

引用次数: 0

Re-isolation of Gonyaulax hyalina from the type locality in the Gulf of Aden: Integrated analysis of morphological, molecular, and toxicological characteristics. 从亚丁湾类型地重新分离透明质Gonyaulax：形态、分子和毒理学特征的综合分析。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-08-30 DOI: 10.1111/jpy.70075

Mahamoud A Chirdon, Kenneth N Mertens, Gwenaël Bilien, Amélie Derrien, Lam Nguyen-Ngoc, Hai Doan-Nhu, Hyeon Ho Shin, Zhun Li, Haifeng Gu, Moussa M Ahmed, Philipp Hess, Mohamed O Awaleh, Nasri H Ibrahim

{"title":"Re-isolation of Gonyaulax hyalina from the type locality in the Gulf of Aden: Integrated analysis of morphological, molecular, and toxicological characteristics.","authors":"Mahamoud A Chirdon, Kenneth N Mertens, Gwenaël Bilien, Amélie Derrien, Lam Nguyen-Ngoc, Hai Doan-Nhu, Hyeon Ho Shin, Zhun Li, Haifeng Gu, Moussa M Ahmed, Philipp Hess, Mohamed O Awaleh, Nasri H Ibrahim","doi":"10.1111/jpy.70075","DOIUrl":"https://doi.org/10.1111/jpy.70075","url":null,"abstract":"This study provides a comprehensive investigation of Gonyaulax hyalina, integrating morphological, phylogenetic, and toxicological approaches. Strains were re-isolated from its type locality in the Gulf of Aden (western Indian Ocean) 124 years after its original description by Ostenfeld and Schmidt (1901, p. 141), along with additional Pacific strains collected from Korea and Viet Nam. The primary objective was to clarify the taxonomy of G. hyalina, which has frequently been confused with the morphologically similar G. fragilis. Morphological and molecular data confirmed that the Indo-Pacific strains examined belong to G. hyalina. Diagnostic morphological features supporting this identification included the presence of a characteristic surface ornamentation, a distinct anterior intercalary plate 1a, and comparatively smaller cell dimensions. Phylogenetic analyses based on LSU and SSU rRNA gene sequences revealed that these strains formed a distinct clade, separate from existing G. hyalina sequences in GenBank. This phylogenetic analyses indicated the presence of two ribotypes (A and B) within the species, although morphological characters do not reflect this, providing evidence of cryptic speciation in G. hyalina. Ribotype B corresponded to strains previously associated with gelatinous mucilage aggregates, known from the Mediterranean and New Zealand coastal waters. Toxicological assays conducted on strain DJ_I3 from the Gulf of Aden showed no detectable toxin production. Lastly, analysis of seasonal dynamics in the Gulf of Aden demonstrated that G. hyalina is present throughout the year, with abundance peaking in summer and declining markedly during winter months.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Mitochondrial mRNA oligocitydylation occurs in Chlorophyceae and Ulvales but not Bryopsidales or Trebouxiophyceae. 线粒体mRNA寡胞酰基化发生在绿藻门和叶藻门，而不发生在苔藓门和海藻门。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-08-28 DOI: 10.1111/jpy.70080

A Bruce Cahoon, Isabella J Maggard, Waleed N Pathan

{"title":"Mitochondrial mRNA oligocitydylation occurs in Chlorophyceae and Ulvales but not Bryopsidales or Trebouxiophyceae.","authors":"A Bruce Cahoon, Isabella J Maggard, Waleed N Pathan","doi":"10.1111/jpy.70080","DOIUrl":"https://doi.org/10.1111/jpy.70080","url":null,"abstract":"Mitochondrial mRNAs in the green algal class Chlorophyceae have non-template 3' oligo-cytosine-rich additions, also known as oligo(C), polycitydylation, or poly(C) \"tails.\" These oligonucleotide additions are believed to be unique to green algal mitochondria, as none have been observed in any other organism. Among algae, oligocitydylation had only been observed in species within the Chlorophyceae, with no evidence of it occurring in other taxonomic classes. In this study, evidence is presented that mitochondrial mRNA oligocitydylation occurs in the genus Ulva, demonstrating its presence in the Class Ulvophyceae and Order Ulvales. Two other species in Ulvophyceae, Bryopsis plumosa and Codium fragile, from the Order Bryopsidales were also screened, but no evidence of oligonucleotide additions was observed. This demonstrates that oligocitydylation occurs in Ulvophyceae but suggests it may be limited to the Ulvales. Three species from Trebouxiophyceae were also screened, and there was no evidence of oligonucleotide additions, suggesting it does not occur in this clade. These results demonstrate that oligocitydylation does occur outside of the Chlorophyceae but only in the closely related Ulvales clade, suggesting this could be a biochemical synapomorphy shared by these groups.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Type-assisted taxonomy and biogeography of Corallina (Corallinales, Rhodophyta) in the eastern Pacific: Corallina americana sp. nov., C. bathybentha, C. hommersandiorum sp. nov., and C. saundersii sp. nov. 东太平洋珊瑚的类型辅助分类与生物地理：美洲珊瑚、深海珊瑚、家山珊瑚和山珊瑚。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-08-27 DOI: 10.1111/jpy.70078

Rachael M Wade, Risa Ogushi, Paul W Gabrielson, Katharine R Hind, Jeffery R Hughey, Sandra C Lindstrom, Kathy Ann Miller, Patrick T Martone

{"title":"Type-assisted taxonomy and biogeography of Corallina (Corallinales, Rhodophyta) in the eastern Pacific: Corallina americana sp. nov., C. bathybentha, C. hommersandiorum sp. nov., and C. saundersii sp. nov.","authors":"Rachael M Wade, Risa Ogushi, Paul W Gabrielson, Katharine R Hind, Jeffery R Hughey, Sandra C Lindstrom, Kathy Ann Miller, Patrick T Martone","doi":"10.1111/jpy.70078","DOIUrl":"https://doi.org/10.1111/jpy.70078","url":null,"abstract":"The articulated coralline genus Corallina is common in temperate rocky ecosystems and provides settlement substrate and refugia for other organisms. However, our ability to understand species-specific traits and interactions has been confounded by overlapping morphological characteristics among species. DNA sequences from type specimens and recently collected specimens have begun to address these issues by clarifying phylogenetic species boundaries and geographic distributions. We sequenced an rbcL gene barcode from a paratype specimen of Corallina bathybentha (type locality: 0.5 miles south of the west end of Anacapa Is., California, United States) and have provided an updated description. Three cryptic species have been described: C. hommersandiorum and C. saundersii are endemic to the northeastern Pacific, whereas C. americana is anti-tropical in the eastern Pacific. Haplotype network analyses using the COI locus suggested that C. americana naturally dispersed from North to South America; it was not likely a recent or human-mediated introduction. To explore species boundaries, stepwise discriminant models were used to analyze morphological and ecological traits and were visualized in canonical multidimensional plots. Every species overlapped in canonical space with at least one other species, further illustrating that morphological identifications of Corallina species are challenging and unreliable. This work completes the taxonomic study of the currently known diversity of Corallina in the northeast Pacific for which we have access to type specimens. Given that this region is likely the center of origin and home to three-quarters of the known Corallina species, these taxonomic studies, including this one, make a significant contribution to our understanding of coralline diversity.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Using computational fluid dynamics to assess trait functions of life at low Reynolds numbers. 用计算流体动力学评估低雷诺数下生命的特征函数。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-08-27 DOI: 10.1111/jpy.70065

Joseph Mohan, Jake A Mohan, Jasmine E Saros

{"title":"Using computational fluid dynamics to assess trait functions of life at low Reynolds numbers.","authors":"Joseph Mohan, Jake A Mohan, Jasmine E Saros","doi":"10.1111/jpy.70065","DOIUrl":"https://doi.org/10.1111/jpy.70065","url":null,"abstract":"We applied computational fluid dynamic simulations to three-dimensional (3D) computer models of diatoms to assess the effect of trait functions on niche space without the confounding influence of correlated traits. Sinking behavior of phytoplankton was assessed via computer-simulated experiments to test the physics of life at low Reynolds numbers. Specifically, 3D models of Stephanodiscus niagarae were constructed across the middle of the species size range and were placed in simulations to assess variance in the sinking and acceleration rates of the cells. First, we simulated models of anatomically correct cells as a control group. To assess trait function, in this case the function of the spines that encompass the outer rim of each frustule (cell wall), simulations of the model were rerun under the same conditions with the trait removed from the model as the experimental group. We observed that spines served to reduce the influence of outside forces on the cell, specifically the force of gravity, by reducing the sinking and acceleration rates of spined versus spineless models. We also observed that spines increased the range of sinking rates, which increased the dispersal of a population by increasing the range of responses to turbulence. When Hutchinson (1961) presented the paradox of plankton, there was a caveat \"it is hard to believe that in turbulent open water many physical opportunities for niche-diversification exist\" (p. 141). Herein we have shown that many opportunities for niche diversification are tied to a single trait. By testing trait function in fluid dynamic simulations, we can examine global trends in biodiversity.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Hulburtia sanyaensis gen. et sp. nov., a sand-dwelling dinoflagellate from the South China Sea, and ultrastructure of Pseudocochlodinium profundisulcus and Grammatodinium tongyeonginum. 南海沙栖鞭毛藻Hulburtia sanyaensis gen. et sp. nov.及pseudococlodinium profundisulcus和Grammatodinium tongyeonginum的超微结构。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-08-26 DOI: 10.1111/jpy.70072

Haifeng Gu, Shuhong Huang, Shuning Huang, Lei Wang, Kenneth Neil Mertens, Chui Pin Leaw, Po Teen Lim, Koyo Kuwata, Mitsunori Iwataki

{"title":"Hulburtia sanyaensis gen. et sp. nov., a sand-dwelling dinoflagellate from the South China Sea, and ultrastructure of Pseudocochlodinium profundisulcus and Grammatodinium tongyeonginum.","authors":"Haifeng Gu, Shuhong Huang, Shuning Huang, Lei Wang, Kenneth Neil Mertens, Chui Pin Leaw, Po Teen Lim, Koyo Kuwata, Mitsunori Iwataki","doi":"10.1111/jpy.70072","DOIUrl":"https://doi.org/10.1111/jpy.70072","url":null,"abstract":"Athecate dinoflagellates have a complex evolutionary history and are considered paraphyletic. Phylogenetic relationships among athecate dinoflagellate species and their higher taxonomic levels remain far from resolved. In the present study, six strains of athecate dinoflagellates were established by isolating single cells or cysts from the South China Sea. Both morphology and ultrastructure were examined in detail, and ribosomal DNA sequences were obtained. Two sand-dwelling strains were assigned to Hulburtia sanyaensis gen. et sp. nov., characterized by a dominant non-motile stage and a semicircular apical structure complex (ASC). Asexual reproduction occurred through binary fission during the immotile phase and formed a cluster of up to 16 cells. The species was also recorded from Kagoshima, Japan. The other strains were identified as Pseudocochlodinium profundisulcus and Grammatodinium tongyeonginum. Nuclear chambers were observed in P. profundisulcus but not in the other two species. The Chinese G. tongyeonginum shared 96.37% sequence similarity in the SSU rDNA region with specimens from South Korea. The molecular phylogeny was inferred using maximum likelihood and Bayesian inference based on concatenated sequences of the SSU, ITS, and LSU rDNA regions. Pseudocochlodinium profundisulcus was nested within Gymnodiniales sensu stricto, while H. sanyaensis and G. tongyeonginum were positioned distantly from this group. The genera Hulburtia and Grammatodinium were closely related to the fossil thecate dinoflagellate Dapsilidinium, but their higher taxonomic ranks remain to be determined. Our results highlight the underestimation of athecate dinoflagellate diversity and emphasize the significance of ultrastructure characteristics to understand their evolution.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Long lifespan and substantial biomass production support stable high biomass of Ascophyllum nodosum under interannual climate fluctuations in Greenland. 在格陵兰年际气候波动下，长寿命和大量的生物量生产支持藤蔓稳定的高生物量。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-08-25 DOI: 10.1111/jpy.70071

Birgit Olesen, Núria Marbà, Carlos M Duarte, Dorte Krause-Jensen

{"title":"Long lifespan and substantial biomass production support stable high biomass of Ascophyllum nodosum under interannual climate fluctuations in Greenland.","authors":"Birgit Olesen, Núria Marbà, Carlos M Duarte, Dorte Krause-Jensen","doi":"10.1111/jpy.70071","DOIUrl":"https://doi.org/10.1111/jpy.70071","url":null,"abstract":"The brown macroalga Ascophyllum nodosum is a foundation species on intertidal rocky shores, where its perennial canopy and high productivity support key ecological functions. However, its population dynamics near the northern edge, where low temperatures and sea ice may challenge stability, are largely unknown. We followed the population structure, dynamics, and nutrient status of A. nodosum in the sheltered, subarctic Kobbefjord, Greenland from 2012 to 2019. Despite the northern location, population biomass (16-27 kg FW · m-2) was within the upper known range and was dominated by few large (max length: 109 cm), old individuals (observed age: up to 19 years; estimated mean lifespan: 37.5 years based on intrinsic mortality rate). Population density remained stable because of low mortality (0.019 · year-1) and recruitment rates (0.010 · year-1), sustained by an understory of small juveniles. Biomass increased 1.5-fold over the 8-year study, supported by high biomass productivity (3.3-8.1 kg FW · m-2 · year-1) that balanced branch loss and reflected a moderate biomass turnover time (2.6-6.3 years) of organic matter, underlying the apparent stability. Such overall population stability reflects a \"biomass storer\" strategy typical of environments with low disturbance and nutrient levels. The stability is remarkable given seasonal ice cover (2-7.5 months per year), large variation in average daily temperature (-3.9 to 15.4°C), and low nutrient supply. While ice breakup poses a risk of shoot abrasion, the ice cover likely provides protection against ice scouring. Enhanced growth during warmer summers and earlier ice break-up suggests faster turnover rates in the future to the extent nutrient availability can support it.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144958392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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