Journal of Phycology最新文献

A phylogenetic investigation of the genus Spyridia (Callithamniaceae, Rhodophyta) in Bermuda uncovers four new species. 在百慕大发现了四个新种的Spyridia属（Callithamniaceae, Rhodophyta）的系统发育研究。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-10-08 DOI: 10.1111/jpy.70092

Craig W Schneider, Gary W Saunders

引用次数: 0

Phylogenetic relationships among seven freshwater red algal genera in the Batrachospermaceae (Batrachospermales, Rhodophyta) using complete chloroplast genome data. 利用完整叶绿体基因组数据研究淡水红藻科7个属的系统发育关系。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-10-06 DOI: 10.1111/jpy.70095

Roseanna M Crowell, Kenneth G Karol, Morgan L Vis

{"title":"Phylogenetic relationships among seven freshwater red algal genera in the Batrachospermaceae (Batrachospermales, Rhodophyta) using complete chloroplast genome data.","authors":"Roseanna M Crowell, Kenneth G Karol, Morgan L Vis","doi":"10.1111/jpy.70095","DOIUrl":"https://doi.org/10.1111/jpy.70095","url":null,"abstract":"Systematics studies within the freshwater red algal order Batrachospermales have used only one to a few genes to infer evolutionary relationships. The phylogenetic trees presented in these studies recovered monophyletic genera with strong support, but the relationships among genera were often not well supported. Chloroplast genome sequencing may provide the necessary data to obtain a fully resolved, strongly supported phylogeny. In order to test the efficacy of this approach, we focused on a subclade of seven genera and sequenced chloroplast genomes from 10 species. Utilizing new and previously published data, a phylogeny was constructed from 132 chloroplast-encoded genes. The relationships among all seven genera had strong statistical support. The phylogeny and gross morphology of genera showed concordance. Lemanea and Paralemanea with tube-like pseudoparenchymatous gametophytes formed a clade, and five genera-Batrachospermum, Lympha, Sirodotia, Tuomeya, and Volatus-with beaded gametophytes formed a second clade. Within the clade of five genera, Batrachospermum with pedicellate carposporophytes was sister to the other three genera with axial carposporophytes and Sirodotia with prostrate carposporophytes along the axis. The results highlight the potential for chloroplast genome data to clarify evolutionary relationships in the Batrachospermales, offering a promising approach for future studies aimed at understanding the broader evolutionary history of this group.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145232914","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

Boreolithothamnion acuminatum sp. nov., B. homoglobosum sp. nov., B. jejuensis sp. nov., and B. japonium comb. nov. (Hapalidiales, Rhodophyta) from Korea: Expanding diversity and biogeographic range in the Northwest Pacific region. 尖突北蝽、同色舌蝽、空肠夜蝽、梳状日本夜蝽。11 . （haalidiales, Rhodophyta）来自韩国：扩大了西北太平洋地区的多样性和生物地理范围。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-10-03 DOI: 10.1111/jpy.70093

So Young Jeong, Boo Yeon Won, Suzanne Fredericq, Tae Oh Cho

{"title":"Boreolithothamnion acuminatum sp. nov., B. homoglobosum sp. nov., B. jejuensis sp. nov., and B. japonium comb. nov. (Hapalidiales, Rhodophyta) from Korea: Expanding diversity and biogeographic range in the Northwest Pacific region.","authors":"So Young Jeong, Boo Yeon Won, Suzanne Fredericq, Tae Oh Cho","doi":"10.1111/jpy.70093","DOIUrl":"https://doi.org/10.1111/jpy.70093","url":null,"abstract":"The non-geniculate coralline genus Boreolithothamnion currently includes eight species with a Northern Hemisphere distribution. To date, only a few studies have focused on the systematics of Boreolithothamnion species. Here, we performed morphological and phylogenetic analyses, based on rbcL, psbA, and SSU rRNA gene datasets, on Boreolithothamnion from Korea as well as DNA-sequenced type material representing nine names. The analyses supported the proposal of three new species of Boreolithothamnion from Korea: B. acuminatum sp. nov., B. homoglobosum sp. nov., and B. jejuensis sp. nov. Boreolithothamnion acuminatum is distinguished by its encrusting to warty growth form, acuminate to cylindrical protuberances, and raised to low-domed tetra/bisporangial conceptacles having bordered pore canals with three to four roof cells. Boreolithothamnion homoglobosum is characterized by a fruticose or unattached rhodolith and simple to bifurcated protuberances. Boreolithothamnion jejuensis is distinguished by an encrusting to undulate or knobby growth form with unbranched protuberances. Phylogenetic analysis of the holotype of Lithothamnion japonicum (TRH C16-3267) based on the psbA gene strongly supported its transfer to the genus Boreolithothamnion, B. japonicum comb. nov. Eight other type specimens of Lithothamnion were also observed to cluster within the Boreolithothamnion clade and were resolved with previously accepted species. This study expands the biogeographical range of Boreolithothamnion in the Northwest Pacific.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145212901","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

Species-environment relationships of coastal diatoms from the Sept-Îles region, Gulf of St-Lawrence (Québec, Canada). 圣劳伦斯湾Sept-Îles地区沿海硅藻的种-环境关系。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-29 DOI: 10.1111/jpy.70094

Emilie Arseneault, Émilie Saulnier-Talbot

{"title":"Species-environment relationships of coastal diatoms from the Sept-Îles region, Gulf of St-Lawrence (Québec, Canada).","authors":"Emilie Arseneault, Émilie Saulnier-Talbot","doi":"10.1111/jpy.70094","DOIUrl":"https://doi.org/10.1111/jpy.70094","url":null,"abstract":"As climate change is having increasingly visible impacts on coastal regions, it is urgent to better understand its effects on the state of ecosystems and the services they provide. To assess the direction and magnitude of change in the high-use waters of the Sept-Îles region in the Gulf of St-Lawrence, we sampled 35 sites along the coast and explored the relationship between surface diatom assemblages and 21 environmental variables. Temperature (14.62%), Secchi depth (12.97%), dissolved silica (6.91%), and magnesium (6.23%) were determined to be significant and independent variables explaining variation in diatom distribution, together explaining 28.6% of the assemblage variance. Temperature and Secchi depth met the λ1/λ2 > 0.5 criterion, but only temperature was selected to develop a transfer function, as these two variables were strongly correlated. A diatom-based temperature transfer function was then developed using weighted-averaging partial least squares (WAPLS; 3; r2 = 0.59, RMSEP = 0.45°C), based on a training set of 32 sites and 55 benthic taxa. However, the model exhibited sensitivity to spatial autocorrelation and may have been influenced by secondary and unmeasured variables. Despite these limitations, the model provides valuable insight into the spatial variability of diatom assemblages and offers potential for paleoenvironmental reconstructions. For optimal inferences, the model should be applied within the studied area. This study contributes to understanding how coastal diatom assemblages respond to environmental gradients and highlights the importance of diatom-based monitoring to assess ongoing ecological changes in aquatic environments.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145186131","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

An undescribed species within the Gymnodinium sensu stricto group found responsible for an exceptional bloom in the Southern Ocean. 一种未被描述的裸子藻属植物，被发现在南大洋造成了一次特殊的水华。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-27 DOI: 10.1111/jpy.70089

Martina Mascioni, Allison Cusick, María Virginia Sanchez-Puerta, Christian Johnson, Hong Zheng, Rick A Reynolds, Andrew E Allen, Gastón O Almandoz

{"title":"An undescribed species within the Gymnodinium sensu stricto group found responsible for an exceptional bloom in the Southern Ocean.","authors":"Martina Mascioni, Allison Cusick, María Virginia Sanchez-Puerta, Christian Johnson, Hong Zheng, Rick A Reynolds, Andrew E Allen, Gastón O Almandoz","doi":"10.1111/jpy.70089","DOIUrl":"https://doi.org/10.1111/jpy.70089","url":null,"abstract":"Naked dinoflagellates are a regular component of the Antarctic phytoplankton but remain poorly studied. In December 2016, the first massive bloom (9.5 × 106 cells · L-1) of small (~15 μm) naked dinoflagellates was recorded in the western Antarctic Peninsula. To identify these organisms, we performed Illumina next-generation sequencing analysis on field samples to obtain genetic information (SSU rDNA 18SV9 and 16SV4-V5). In addition, we performed polymerase chain reaction (PCR) amplification and Sanger sequencing using dinoflagellate-specific primers (LSU rDNA D1-D3 and ITS/5.8S), as well as traditional light and scanning electron microscopy observations. Phylogenetic analyses revealed that these organisms belonged to the Gymnodinium sensu stricto group and may represent an undescribed species. These analyses also indicated that the observed organisms were closely related to the species Gymnodinium dorsalisulcum, G. impudicum, Barrufeta bravensis, and B. resplendens, as well as to the genera Lepidodinium and Wangodinium. This work has provided the LSU rDNA gene sequence from an Antarctic species belonging to the Gymnodinium sensu stricto group along with a description of the observed morphology of these Antarctic blooming dinoflagellates. We compared the 18S V9 amplicon sequence variant (ASV) that dominated the bloom with global databases and observed that it is widely distributed in the Antarctic Peninsula as well as in the global ocean. This study highlights the need for further efforts to identify and describe the diversity of naked dinoflagellates in Antarctic waters.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176113","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

Auxospore fine structure and development in the surirelloid diatom Campylodiscus cf. neofastuosus (Bacillariophyta). 水生硅藻Campylodiscus cf. neofastousus的副孢子精细结构和发育。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-26 DOI: 10.1111/jpy.70085

Masahiko Idei, David G Mann, Tsuyoshi Watanabe, Shinya Sato

{"title":"Auxospore fine structure and development in the surirelloid diatom Campylodiscus cf. neofastuosus (Bacillariophyta).","authors":"Masahiko Idei, David G Mann, Tsuyoshi Watanabe, Shinya Sato","doi":"10.1111/jpy.70085","DOIUrl":"https://doi.org/10.1111/jpy.70085","url":null,"abstract":"The development of the auxospore is reported in the surirelloid diatom Campylodiscus cf. neofastuosus. As in most pennate diatoms, growth of the auxospore is accompanied and constrained by the formation of a transverse perizonium composed of finely structured bands, which are added one after another as the auxospore expands. However, unlike in most pennate diatoms, in which the transverse perizonium develops bidirectionally from a hoop-like or shortly cylindrical primary band formed around the equator of the zygote, in C. cf. neofastuosus, development is unidirectional, outward from a heart-shaped cap at one end of the auxospore. Limited evidence from other surirelloid diatoms suggests that unidirectional perizonium development may be typical of the group. This developmental pattern correlates with the profound symmetry shifts that have occurred during the evolution of the circumferential raphe system of Surirellaceae and may have a common origin with these, despite the difference in life-cycle stage. The longitudinal perizonium of Campylodiscus also exhibits differences from the arrangement typical of most raphid diatoms, since it comprises three concentrically organized bands, including a unique, heavily silicified secondary band, which runs around the whole circumference of the wide primary band. In this and some other Surirellaceae, the longitudinal perizonium seems to play an important role in the morphogenesis of the initial cells by controlling the shape of the protoplast during a contraction before the formation of the initial epivalve. Small extra perizonial elements, unlike any reported previously in raphid diatoms, were detected beneath the suture formed by the ends of the transverse perizonial bands.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145149610","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

Systematics and taxonomy of Codium (Bryopsidales, Chlorophyta) in the Hawaiian Islands: Description of six new species. 夏威夷群岛龙葵（苔藓门，绿藻门）的系统学和分类学：六新种描述。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-25 DOI: 10.1111/jpy.70091

Alison R Sherwood, Kazumi R Allsopp, Erika A Alvarado, Randall K Kosaki, Monica O Paiano, Peggy Rentsch, Heather L Spalding, Rachael M Wade

{"title":"Systematics and taxonomy of Codium (Bryopsidales, Chlorophyta) in the Hawaiian Islands: Description of six new species.","authors":"Alison R Sherwood, Kazumi R Allsopp, Erika A Alvarado, Randall K Kosaki, Monica O Paiano, Peggy Rentsch, Heather L Spalding, Rachael M Wade","doi":"10.1111/jpy.70091","DOIUrl":"https://doi.org/10.1111/jpy.70091","url":null,"abstract":"The well-known Bryopsidalean genus Codium has a worldwide distribution and contains almost 150 species, with cryptic diversity confusing the actual number. In the Hawaiian Islands, 15 species have been previously recorded, with several of these described in the past several decades, largely from specimens collected from mesophotic coral ecosystems. We assessed the diversity of Codium in Hawai'i from both shallow and mesophotic habitats by employing DNA barcoding and phylogenetic analyses of partial rbcL and tufA gen plastid markers and morphological characterization. DNA sequence analyses supported 18 species of Hawaiian Codium (eight of which are considered endemic), which is a 20% increase in recognized species richness for this genus in Hawai'i. Ten previously reported species were confirmed or provisionally confirmed, six new species have been described (C. pikoii sp. nov., C. upohoae sp. nov., C. hakakaupilii sp. nov., C. kanepohihiae sp. nov., C. torulosum sp. nov., and C. iolekaae sp. nov.), and two new records have been reported (C. \"geppiorium4\" and C. taylorii). Twenty-eight percent of Hawaiian Codium clades were mesophotic only, and 22% were shallow only, while 50% of clades were known from both shallow and mesophotic depths. Recent emphasis on the systematics of Hawaiian mesophotic algae has sufficiently increased specimen numbers from this habitat to allow a more complete assessment of the genus in this location, making it one of the most thoroughly collected and studied marine algal genera from Hawai'i and an excellent model for future examination of both horizontal (i.e., spatial) and vertical (i.e., depth) distributional trends.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145137577","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

Short-term resilience, long-term costs: Reduced growth and increased erosion in the kelp Ecklonia radiata (phylum Ochrophyta) following repeated marine heatwaves. 短期恢复力，长期代价：在反复的海洋热浪之后，辐射海带（绿藻门）的生长减少，侵蚀加剧。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-25 DOI: 10.1111/jpy.70076

Olivia J Wynn, Damon Britton, John Beardall, Cintia Iha, Allyson Nardelli, John A Raven, Andrew Bridle, Catriona L Hurd

{"title":"Short-term resilience, long-term costs: Reduced growth and increased erosion in the kelp Ecklonia radiata (phylum Ochrophyta) following repeated marine heatwaves.","authors":"Olivia J Wynn, Damon Britton, John Beardall, Cintia Iha, Allyson Nardelli, John A Raven, Andrew Bridle, Catriona L Hurd","doi":"10.1111/jpy.70076","DOIUrl":"https://doi.org/10.1111/jpy.70076","url":null,"abstract":"Marine heatwaves (MHWs) have increased in frequency by 34% since 1990 and are projected to rise further with global ocean change, posing significant risks to marine ecosystems. Kelps (order Laminariales) provide essential habitats and play key ecological roles, but they are increasingly threatened by MHWs. Tasmania, SE Australia, is a global warming hotspot, but the impacts of recurrent MHWs on the physiological performance of the ecologically dominant kelp Ecklonia radiata remain poorly understood. To address this, we investigated how the frequency of MHWs influenced the physiological and biochemical performance of E. radiata, both during and after MHWs, to evaluate immediate responses and recovery potential. In laboratory experiments, juvenile sporophytes were exposed to three experimental treatments: no-MHW, a single 6-day MHW, and double 6-day MHWs followed by 7-day recovery periods. Ecklonia radiata sporophytes were resilient to the single 6-day MHW, but double MHWs negatively impacted recovery, with reduced growth rates and increased tissue erosion. Although photosynthetic rates remained unaffected, changes in pigment ratios and increased antioxidant activity indicated a mitigation of physiological stress. We propose that energy may be diverted from growth toward repair processes and the maintenance of essential functions. These findings suggest there was cumulative stress caused by repeated MHWs, leading to progressive physiological decline. More frequent MHW events may hinder E. radiata's recovery capacity, with potential ecosystem implications, considering its key ecological role.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145137568","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

Influence of trace metal additions on the longevity of algal blooms across a productivity gradient. 添加微量金属对跨生产力梯度藻华寿命的影响。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-25 DOI: 10.1111/jpy.70090

Matthew F Gladfelter, Isabel G Bela, Alan E Wilson

{"title":"Influence of trace metal additions on the longevity of algal blooms across a productivity gradient.","authors":"Matthew F Gladfelter, Isabel G Bela, Alan E Wilson","doi":"10.1111/jpy.70090","DOIUrl":"https://doi.org/10.1111/jpy.70090","url":null,"abstract":"Phytoplankton require specific nutrients in varying quantities for growth, defense, and proper cell functioning. When macronutrients are present in excess, trace metals can exhibit co-limitation on phytoplankton. This experiment aimed to understand how ambient nutrient concentrations impact phytoplankton community persistence (i.e., bloom longevity). To examine potential interactions, three ponds of escalating trophic states were selected. Pond water was transferred into sealed, clear, floating plastic containers inside a floating frame within each pond. The containers were treated with a full factorial design of additions of nitrogen, phosphorus, and/or a mixture of trace metals. In the oligotrophic pond, the containers treated with nitrogen, phosphorus, and trace metals had 39% more phytoplankton than those treated with just nitrogen and phosphorus, by the end of the experiment. In the mesotrophic pond, the containers treated with nitrogen and trace elements had 14% more phytoplankton than those with nitrogen alone, by the conclusion of the experiment. In the eutrophic pond, no combinations of added nutrients affected algal growth when compared to the control treatment. These results show that the addition of trace metals along with nitrogen and phosphorus allowed phytoplankton to resist the effects of nutrient starvation when compared with treatments that only provided nitrogen and phosphorus. These results indicate the utility of trace metals for sustaining rather than limiting algal growth.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145137584","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

Bull kelp (Durvillaea amatheiae) in southeastern Australia has compromised adaptive capacity to future ocean warming. 澳大利亚东南部的牛海带（Durvillaea amatheiae）已经降低了对未来海洋变暖的适应能力。

IF 3.4 3区生物学

Journal of Phycology Pub Date : 2025-09-24 DOI: 10.1111/jpy.70086

Matt J Nimbs, Tom R Davis, Melinda A Coleman

{"title":"Bull kelp (Durvillaea amatheiae) in southeastern Australia has compromised adaptive capacity to future ocean warming.","authors":"Matt J Nimbs, Tom R Davis, Melinda A Coleman","doi":"10.1111/jpy.70086","DOIUrl":"https://doi.org/10.1111/jpy.70086","url":null,"abstract":"Temperate Australian kelp forests are highly vulnerable to range contractions because of ongoing ocean warming and extremes. The current mainland distribution of the bull kelp Durvillaea amatheiae is confined to the far southeastern corner of the continent where warming is occurring two to four times faster than the global average. Extant populations will, thus, require sufficient genetic adaptive capacity to survive these extremes. We examined neutral and adaptive genomic diversity to assess the adaptive capacity and selective pressure on these range edge populations. We have revealed that prevailing ocean currents and dispersal-restrictive life-history traits have resulted in isolated, inbred populations across the southeastern range, particularly at the northern edge. Temperature-related candidate loci exhibited signatures of selection along thermal gradients, with many of these alleles fixed across the species range, suggesting little remaining adaptive capacity, particularly among the warmest populations. Combined, these elements suggest D. amatheiae may be susceptible to range contractions in the face of ongoing climate change.","PeriodicalId":16831,"journal":{"name":"Journal of Phycology","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145131175","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