Journal of Experimental Marine Biology and Ecology最新文献

{"title":"Red king crab larval survival and development are resilient to ocean acidification","authors":"W. Christopher Long,&nbsp;Alexandra L. Conrad,&nbsp;Jennifer L. Gardner,&nbsp;Robert J. Foy","doi":"10.1016/j.jembe.2024.152028","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152028","url":null,"abstract":"<div><p>Ocean acidification, a decrease in oceanic pH resulting from the uptake of anthropogenic CO2, can be a significant stressor for marine organisms. In this study, we reared red king crab larvae from hatching to the first crab stage in four different pH treatments: current surface ambient, diel fluctuation to mimic larval migration between the surface and mixed layer under current ambient conditions, pH 7.8, and pH 7.5. Larvae were monitored throughout development and the average length of each stage was determined. At each of the zoeal stages, the glaucothoe stage, and the first crab stage, we measured survival, morphometry, dry mass, and carbon, nitrogen, calcium, and magnesium content. Red king crab larvae were highly resilient to ocean acidification. There were no differences among treatments in survival or in average stage length. Although there were clear ontogenetic trends in size, weight, and elemental composition, most of these did not vary with pH treatment. Zoeal morphology did not vary among treatments, although glaucothoe and C1 crabs were slightly smaller in pH 7.8 than in the ambient treatment. Ambient larvae also had a slightly higher mass than pH 7.8 larvae but not pH 7.5. Ambient larvae had higher magnesium contents than pH 7.8 and pH 7.5, but calcium levels were the same. Ambient larvae also had slightly lower carbon and nitrogen content than pH 7.8 and pH 7.5 larvae but only in the 4th zoeal stage. Overall this study suggests that red king crab larvae are well adapted to a wide range of pH conditions and appear resilient to ocean acidification levels projected for the next two centuries.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152028"},"PeriodicalIF":2.0,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141286544","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}

{"title":"Scope for growth of the thick shell mussel Mytilus coruscus under combined stress of Vibrio alginolyticus and Charybdis japonica","authors":"Chunhua Liu ,&nbsp;Jin Qian ,&nbsp;Xiang Chen ,&nbsp;Wei Huang ,&nbsp;Youji Wang ,&nbsp;Fahim Ullah Khan ,&nbsp;Yueyong Shang ,&nbsp;Menghong Hu","doi":"10.1016/j.jembe.2024.152025","DOIUrl":"10.1016/j.jembe.2024.152025","url":null,"abstract":"<div><p><em>Vibrio</em> species is currently recognized as a major contributor to shellfish diseases and mortality in marine habitats. In the natural environment, predator-induced stress also triggers defensive responses in mussels. The purpose of this experiment was to evaluate the combined stress effects of <em>Vibrio alginolyticus</em> and predator crab (<em>Charybdis japonica</em>) on the energy expenditure of the thick shell mussel <em>Mytilus coruscus</em>. Based on our results, when crabs were co-cultured with mussels, there were no significant alterations observed in the clearance rate (CR), respiration rate (RR), or ammonia excretion rate (ER) of mussels. However, significant decreases were noted in the oxygen‑nitrogen ratio (O: N ratio), absorption efficiency (AE), and scope for growth (SFG) of the mussels. Subsequent exposure to <em>V. alginolyticus</em> led to significant reductions in CR, RR, O: N ratio, and SFG of mussels, while ER and AE were significant increased. Additionally, interactive effects of the presence of crabs and <em>Vibrio</em> were observed in CR, RR, ER, O: N ratios, AE and SFG. The results underscore that simultaneous exposure to <em>V. alginolyticus</em> and crabs can diminish the growth energy of mussels. This study provides a basis for better understanding the effects of multi-factorial stress on energy utilization and health of mussels, and lays the foundation for conducting ecotoxicological research on <em>Vibrio</em> and its predators in aquatic environments.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152025"},"PeriodicalIF":2.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194110","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}

{"title":"GC-MS based identification of anti-microbial bioactive compounds, isolated from Bacillus halotolerans of marine sediment","authors":"Kanchan Soni,&nbsp;Ashima Bagaria","doi":"10.1016/j.jembe.2024.152026","DOIUrl":"10.1016/j.jembe.2024.152026","url":null,"abstract":"<div><p>Marine environments are known for their complex habitats due to the spread of industrial pollutants, and microorganisms that endure adverse conditions are evolving as extremophiles. The present study is designed to explore the antimicrobial activity of microbes present in marine ecosystems that secrete bioactive compounds. The bacterial strains VT-2, VT-4, and VT-5 isolated from the marine sediment exerted an inhibitory effect against the human pathogenic microorganisms <em>Escherichia coli</em> (<em>E. coli</em>), <em>Staphylococcus aureus</em> (<em>S. aureus</em>), and <em>Pseudomonas aeruginosa</em> (<em>P. aeruginosa</em>). Among the three strains, VT-5 exhibited efficient antibiotic potential. Based on biochemical characterisation, the VT-5 strain is gram-positive, rod-shaped, and demonstrates resilience to stress, salt, and drought. The 16 s r-RNA analysis confirmed <em>Bacillus halotolerans</em>, having a similarity of 99.75%. Bioactive compounds released by the VT-5 strain had efficient antibacterial activity, which was also observed in FESEM micrographs as deformation of cellular structure in pathogens. The chromatographic extraction of VT-5 was identified to have antibacterial bioactive compounds, and that was further determined by using FTIR and GC/MS. The peaks observed in the FTIR spectrum with different functional groups showed similarity to the structures of these isolated bioactive compounds. GC/MS analysis also revealed the presence of nine vital bioactive compounds, most of which have been reported to exhibit antimicrobial activity. Our study further strengthens that VT-5 (<em>Bacillus halotolerans</em>) is resistant to MDR (<em>Pseudomonas aeruginosa</em>) and MRSA (<em>Staphylococcus aureus</em>) pathogenic strains. Furthermore, this study explores marine-associated microbes as a promising avenue for new antimicrobial drugs, revealing possibilities for marine organism-derived compounds.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152026"},"PeriodicalIF":2.0,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194350","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}

{"title":"Differences in larval acidification tolerance among populations of the eastern oyster, Crassostrea virginica","authors":"Anthony R. Himes ,&nbsp;Annie Schatz ,&nbsp;Emily B. Rivest","doi":"10.1016/j.jembe.2024.152023","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152023","url":null,"abstract":"<div><p>The eastern oyster, <em>Crassostrea virginica</em>, is an ecologically and economically important species that is threatened by ongoing coastal ocean acidification. Oyster larvae are known to be more susceptible to acidification than either juvenile or adult life stages, but less is known about what levels of acidification induce a stress response and how this stress response changes with increasing acidification. Furthermore, little is known about population-level variability in acidification tolerance in <em>C. virginica</em>, making predictions of how this species will respond to future environmental scenarios difficult. To address these knowledge gaps, both whole animal and cellular metrics were used to quantify the acidification response of larvae produced by adults collected from Page Rock reef and Parrot's Rock reef, two spatially distinct reefs in adjacent tributaries of Chesapeake Bay. A comparison of Page Rock reef larvae among four acidification scenarios (pH 7.8, 7.5, 7.2, 7.0) revealed differences in shell length, total protein content, and triglyceride content, with growth increasingly impacted as acidification intensity increased. However, the sensitivity of these traits to acidification varied, where shell length was similarly impacted between pH 7.5 and 7.2, while protein and triglyceride content continued to decrease between these acidification scenarios. Triglyceride accumulation was most severely impacted under the lowest pH tested (pH 7.0), signaling that acidification could ultimately reduce the number of individuals successfully recruiting into the adult population if adequate energy stores cannot be accumulated for metamorphosis. A comparison of larvae between the two reefs at pH 7.8 and 7.2 revealed differences in survival, growth, and energy accumulation that suggest clear underlying physiological variations in larvae between reefs and unique sensitivities to acidification stress. These findings demonstrate that acidification tolerance within <em>C. virginica</em> can vary by population, which will have important implications for industry and conservation efforts as more resilient populations would make better candidates for future selective breeding efforts as well as restoration initiatives.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152023"},"PeriodicalIF":2.0,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141164517","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}

{"title":"Does the extent of glacial cover across watersheds and discharge periods affect dietary resource use of nearshore fishes in the Northern Gulf of Alaska?","authors":"Lindsey Stadler ,&nbsp;Kristen Gorman ,&nbsp;Vanessa von Biela ,&nbsp;Andrew Seitz ,&nbsp;Katrin Iken","doi":"10.1016/j.jembe.2024.152022","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152022","url":null,"abstract":"<div><p>Northern high-latitude glaciers impact nearshore marine ecosystems through the discharge of cold and fresh waters, including nutrients and organic matter. Fishes are important integrators of ecosystem processes and hold key positions in the transfer of energy to higher trophic positions in such systems. This study used a natural gradient in space and time, including watershed glacial cover (0–60%) of five adjacent estuaries and three sequential discharge periods (pre-peak, peak, post-peak) in the northern Gulf of Alaska (Kachemak Bay) to test whether differences in glacial cover of watersheds upstream of estuaries affect dietary resource use of nearshore fishes. Dietary resource use was assessed using stomach content and stable carbon and nitrogen isotope analyses to determine fish diet composition and trophic niche width. Crescent gunnel (<em>Pholis laeta</em>), a mostly sedentary species, was our focal species for comparisons across estuaries and discharge periods. Discharge period had a greater influence on diet composition and trophic niche width of crescent gunnels than watershed glacial coverage. Niche width of crescent gunnel was larger during the post-peak discharge period compared to pre-peak and peak periods, coincident with a shift in prey spectrum. However, watershed glacial cover was not a suitable predictor of niche width of crescent gunnel. Trophic resource use was also considered along this glacial cover gradient for two other fish species, Pacific staghorn sculpin (<em>Leptocottus armatus</em>) and starry flounder (<em>Platichthys stellatus</em>), but within the post-peak discharge period only. These species exploited a larger prey base compared to crescent gunnel, likely due to their greater mobility. Similar to crescent gunnel, there were no relationships in trophic niche width associated with watershed glacial coverage for these other species during the post-peak discharge period. Instead, trophic resource use of these three nearshore fish species was influenced by a more complex set of dynamic environmental variables (salinity, temperature, turbidity, and discharge), as well as static watershed characteristics, especially vegetation cover. Such drivers can act through changes in metabolic rates, modulating foraging strategies and trophic connectivity, as well as terrestrial nutrient delivery to support estuarine production. The environmental conditions associated with the glacially influenced estuaries during our study period (2020−2021) seemed within a range that allowed nearshore fishes to maintain energy pathways and prey bases across these estuaries, but it is unknown how these estuarine food webs may be influenced in years of extreme conditions such as during heat waves, droughts, or floods.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152022"},"PeriodicalIF":2.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000376/pdfft?md5=897bbeb054cf789cdbfe900aeb91a644&pid=1-s2.0-S0022098124000376-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141083305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Particle loads, contractile responses and cleaning in the demosponge Halichondria panicea","authors":"Josephine Goldstein ,&nbsp;Hans Ulrik Riisgård ,&nbsp;Rachael A. Kealy ,&nbsp;Peter Funch","doi":"10.1016/j.jembe.2024.152021","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152021","url":null,"abstract":"<div><p>Sponges exposed to high concentrations of particles during filter-feeding may become overloaded, triggering closure of the osculum and contraction of the sponge, thus preventing too many particles from entering the aquiferous system. However, the minimum particle concentration of small versus larger particles that triggers contractions has not yet been described. Here, based on microscope-video recordings, we report our observations of explants of the demosponge <em>Halichondria panicea</em>. Explants contracted within &lt;1 h in response to high concentrations of cyanobacteria (<em>Cyanobium bacillare</em>; 1 × 10⁶ cells mL⁻¹), small 2 μm beads (1 × 10⁷ particles mL⁻¹), larger algal cells (<em>Rhodomonas salina</em>), and 10 μm beads (1 × 10⁵ mL⁻¹, respectively). No contractions occurred in sponge explants exposed to these particle types at concentrations &lt;0.5 × 10⁴ mL⁻¹. Likewise, inorganic marl and ink particles induced osculum closure in sponge explants at concentrations ranging from 1 × 10⁵ to 1 × 10⁶ particles mL⁻¹. When the explants were subsequently transferred to clean water, they either expelled the ingested inorganic particles in mucus-entangled clumps with the exhalant jet, or translocated the particles to the sponge surface along with local peristaltic-like contractions. The trigger levels of inorganic particles were high compared to reported re-suspended sediment concentrations in the sea, and the observed contractile responses may thus primarily serve to protect sponges from clogging during extreme environmental events.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152021"},"PeriodicalIF":2.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000364/pdfft?md5=2af67b5ff597c877189165b52e9caad5&pid=1-s2.0-S0022098124000364-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141083306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of sediment type and light availability on the burying behaviour of small sandeel (Ammodytes tobianus)","authors":"Ole Henriksen ,&nbsp;Nicholas P. Moran ,&nbsp;Louis A. Veilex ,&nbsp;Jane W. Behrens ,&nbsp;Anders Nielsen ,&nbsp;Tobias K. Mildenberger ,&nbsp;Peter J. Wright ,&nbsp;Henrik Jensen ,&nbsp;Mikael van Deurs","doi":"10.1016/j.jembe.2024.152020","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152020","url":null,"abstract":"<div><p>This study examines the sediment preferences of small sandeel (<em>Ammodytes tobianus</em>), an elongated forage fish common in marine and brackish environments of northern Europe. Sandeel have a high fidelity for sandy habitats and spend much of their lives buried, as an important part of both their diel behavioural cycles and overwintering behaviour. A series of independent choice laboratory assays were conducted using wild-caught schools of small sandeel, to: (1) determine their preferred substrate composition for burial; (2) identify the upper limits of sediment grain-sizes that may be utilised for burial, and; (3) investigate the effects of light intensity on burial behaviour. Initial experiments found a clear preference for burial within sediments composed of coarse sand and fine gravel (0.5–4.0 mm) but showed at least some utilisation of both coarser and finer sediment compositions. In further trials, burial was found to be almost entirely eliminated in sediments that contained significant gravel components &gt;4.0 mm. Light manipulation experiments also showed that light intensity was an important factor that influences their choice of burial area. This study is the first to experimentally investigate the sediment preferences and grain-size tolerance limits of small sandeel. These results specifically highlight how subtle differences in both sediment composition and light may influence the habitat usage of small sandeel, which may be valuable for understanding their distribution in the wild and to inform future management and conservation for the species.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152020"},"PeriodicalIF":2.0,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000352/pdfft?md5=aded949d11a44d50c526491ab3733fc4&pid=1-s2.0-S0022098124000352-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141068689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth stimulation of toxic dinoflagellate Prorocentrum cordatum with herbicide glyphosate","authors":"Natalia Shoman,&nbsp;Ekaterina Solomonova,&nbsp;Arkady Akimov","doi":"10.1016/j.jembe.2024.152017","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152017","url":null,"abstract":"<div><p>Worldwide used glyphosate-based organophosphorus herbicides may be potential phosphorus sources for phytoplankton in coastal waters. In this study, the changes in growth, fluorescent and cytometric parameters of the potentially toxic dinophytic algae <em>Prorocentrum cordatum</em> under the influence of glyphosate of different concentrations were investigated. The effect of glyphosate on the growth dynamics of <em>P. cordatum</em> under conditions of availability and deficiency of inorganic phosphorus in the medium is estimated. Results showed that <em>P. cordatum</em> could grow due to glyphosate as the only source of phosphorus. The final density of the culture was higher than that of the control (without glyphosate) by 22–136% depending on the applied herbicide concentration. Glyphosate stimulated the growth of microalgae, which was observed in increasing the efficiency of the photosynthetic apparatus of cells and their enzymatic (esterase) activity. <em>P. cordatum</em> used glyphosate as a source of phosphorus only when there was a deficiency in inorganic phosphorus, but it was also susceptible to the herbicide when there was inorganic phosphorus present in the medium. An increase of glyphosate concentration in coastal waters may lead to a change in the species structure of natural biocenoses and increase in the number of potentially harmful species.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"577 ","pages":"Article 152017"},"PeriodicalIF":2.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140947667","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}

{"title":"Phenotypic plasticity drives seasonal thermal tolerance in a Baltic copepod","authors":"Alexandra Hahn,&nbsp;Reid S. Brennan","doi":"10.1016/j.jembe.2024.152014","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152014","url":null,"abstract":"<div><p>Seasonal changes in environmental conditions require substantial physiological responses for population persistence. Phenotypic plasticity is a common mechanism to tolerate these changes, but for organisms with short generation times rapid adaptation may also be a contributing factor. Here, we used a common garden design (11 °C and 18 °C) to disentangle the impacts of adaptation from phenotypic plasticity on thermal tolerance of the calanoid copepod <em>Acartia hudsonica</em> collected throughout spring and summer of a single year. <em>Acartia hudsonica</em> were collected from five time points across the season and thermal tolerance was determined using critical thermal maximum <span><math><mfenced><msub><mi>CT</mi><mi>max</mi></msub></mfenced></math></span> followed by additional measurements after one generation of common garden. As sea surface temperature increased through the season, field collected individuals showed corresponding increases in thermal tolerance but decreases in body size. Despite different thermal tolerances of wild collections, after one generation of common garden animals did not differ in <span><math><msub><mi>CT</mi><mi>max</mi></msub></math></span> within thermal treatments. Instead, there was evidence of phenotypic plasticity where higher temperatures were tolerated by the 18 °C versus the 11 °C treatment animals across all collections. Despite persisting differences between collections due to either adaptation or parental effects, acclimation also had significant effects on body size, with the warm treatment resulting in smaller individuals, consistent with the temperature size rule. Therefore, the differences in thermal tolerance and body size observed in field collected <em>A. hudsonica</em> were predominantly driven by plasticity rather than adaptation. However, the observed decrease in body size suggests that nutrient availability for higher trophic levels and ecosystem functioning could be impacted if temperatures consistently increase with no change in copepod abundance. This is the first record of <em>A. hudsonica</em> in the Baltic Sea known to the authors.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"576 ","pages":"Article 152014"},"PeriodicalIF":2.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000297/pdfft?md5=da962604f0055b7af04e7c054ac2764a&pid=1-s2.0-S0022098124000297-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140905408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of glacial discharge on thallus condition of northern rockweed (Fucus distichus) in the Gulf of Alaska","authors":"Michael A. Kim ,&nbsp;Katrin Iken","doi":"10.1016/j.jembe.2024.152019","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152019","url":null,"abstract":"<div><p>Glacial melt due to climate warming is expected to accelerate in high-latitude ecosystems, necessitating an understanding of how this may influence foundation species in coastal systems. The goal of this study was to use a gradient of glaciation along five watersheds in a south-central Alaskan fjord to investigate the relationship between downstream effects of glacial cover and the thallus condition of the habitat-building rockweed, <em>Fucus distichus</em>. We used compositional and biochemical data from <em>F. distichus</em> thallus samples collected across six months from all five watershed sites and related them to nearshore environmental data taken at each month and site. Most thallus condition metrics changed more related to sampling month than watershed glacial cover, with most metrics decreasing over the sampling period. This was possibly related to the build-up of more structural materials such as cell wall and other chemical structural elements during later-season growth. Lipid content was the only metric that differed systematically by watershed glacial cover, with lower lipid content at the sites with higher glacial cover and assumed higher glacial discharge of the watershed. Most thallus condition metrics were related to water temperature, with the increase during the sampling period reflecting a seasonal warming rather than an influence of increased glacial discharge in the summer. Less effects were seen from lower salinity and higher turbidity in the summer related to seasonally increased glacial discharge. These results indicate that <em>F. distichus</em> is tolerant to the currently experienced range of environmental conditions in glacial watersheds, at least during the sampling years. Possible effects of increasing glacial discharge conditions on other <em>F. distichus</em> life stages (e.g., zygotes) that are vital to maintain genetically diverse populations, or the ability of this species to maintain high primary production and provide habitat and high-quality food for coastal consumers under increasing melt or warming conditions, remain uncertain.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"576 ","pages":"Article 152019"},"PeriodicalIF":2.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140893407","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}