Journal of Experimental Marine Biology and Ecology最新文献

{"title":"Reduced predator avoidance behavior and higher exposure to thermal stress for prey during heat wave events","authors":"Wissam A. Jawad,&nbsp;Ana L. Salgado,&nbsp;Morgan W. Kelly","doi":"10.1016/j.jembe.2024.152060","DOIUrl":"10.1016/j.jembe.2024.152060","url":null,"abstract":"<div><div>Heat wave events threaten natural communities by causing mass mortalities and altering species interactions. Some organisms can use behavioral thermoregulation to avoid extreme temperatures, which may buffer them against rising incidents of heat events. While behavioral thermoregulation is effective at avoiding stressful temperatures, less is known about how it can alter other adaptive behaviors like predator avoidance. In this study, we used laboratory and outdoor mesocosm experiments to understand how behavioral thermoregulation is impacted by the presence of local predators during heat wave events, by exposing intertidal marsh periwinkles (<em>Littoraria irrorata</em>) to simulated heat waves and cues from blue crabs (<em>Callinectes sapidus</em>). We measured snail climbing height and body temperatures to disentangle snail decisions to thermoregulate or avoid predators under increasing heat stress. Our results indicate that antipredator behavior can be severely reduced in heat wave simulations, in temperatures well below the snail's upper thermal limits. Snails chose lower climbing heights that allowed them to avoid stressful temperatures but brought them within reach of subtidal predators. Thus, while heat waves may not directly kill snails because they can behaviorally thermoregulate, reduction in antipredator response can increase their encounters with subtidal predators. Additionally, when snails maintained antipredator climbing behavior in lower intensity heat wave simulations, snails occupied hotter microclimates and had higher body temperatures, indicating predator avoidance increases the temperatures snails experience. Local predator presence can increase the exposure of prey species to temperature stress during heat events, and these events can decrease the size and number of tolerable microhabitats for mobile ectotherms.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152060"},"PeriodicalIF":1.8,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425246","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":"Differential impacts of light on coral phenotypic responses to acute heat stress","authors":"Carolina Castro-Sanguino ,&nbsp;Declan Stick ,&nbsp;Shannon Duffy ,&nbsp;Camille Grimaldi ,&nbsp;James Gilmour ,&nbsp;Luke Thomas","doi":"10.1016/j.jembe.2024.152057","DOIUrl":"10.1016/j.jembe.2024.152057","url":null,"abstract":"<div><div>Reef building corals are in global decline due to climate change and other pressures. Yet, corals show wide variation in physiological responses to heat stress. The influence of light is often dismissed when characterising variation in coral thermal tolerance. Hence, we investigate how light levels affect the photochemical and bleaching responses that typically inform coral thermal tolerance in acute heat-stress experiments using corals from two habitats. Despite natural variations in temperature regimes between sites, both coral populations responded similarly to acute heat-stress across seasons. The decline in the photochemical response (<em>Fv/Fm)</em> after heat stress (winter: +9 °C, summer: + 7.5 °C) was small on average (≤ 6 %) indicating no light stress, but consistently greater in high light (16–24 Daily light integrals, DLI) compared to low light treatments (4–11 DLI). <em>Fv/Fm</em> responses varied per genotype (+3 % to −50 % relative change) and despite small declines in <em>Fv/Fm</em>, all genotypes lost pigment in summer (10 % to 45 % relative change in tissue colour) and paled significantly irrespective of light treatment. These results highlight the complexity of the bleaching response to the primary drivers of temperature and light stress. Further research is needed to understand how light levels affect acute heat-stress responses across studies particularly when thermal tolerance is based on single phenotypes. Incorporating light as a contributing factor to thermal stress indicators will advance our understanding of coral temperature thresholds, to improve coral bleaching predictions based on ubiquitous environmental drivers.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152057"},"PeriodicalIF":1.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359516","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":"Age at weaning of California sea lions depends on colony latitude","authors":"Martha P. Rosas-Hernández ,&nbsp;Claudia J. Hernández-Camacho ,&nbsp;David Aurioles-Gamboa ,&nbsp;Andrew W. Trites","doi":"10.1016/j.jembe.2024.152059","DOIUrl":"10.1016/j.jembe.2024.152059","url":null,"abstract":"<div><div>The age at which sea lions wean can vary significantly between years and among populations. It is an important life-history parameter that is influenced by environmental conditions and can drive changes in sea lion numbers. However, knowing when weaning begins and ends is difficult to determine. We developed a method (using Fourier analysis) to identify the lactation period from changes in the <em>δ</em>¹⁵N profiles of vibrissae from juvenile California sea lions—born in three colonies in Mexico. We sectioned vibrissae from 15 juvenile California sea lions (aged approximately 12 months) into 33–74 segments of similar weight. We measured <em>δ</em>¹⁵N and <em>δ</em>¹³C for each vibrissa segment and assigned dates to each one using site-specific vibrissa growth rates. We also compared the <em>δ</em>¹⁵N profiles that corresponded to the pup stage on the juvenile vibrissae with <em>δ</em>¹⁵N values of adult female vibrissae from the same colonies to validate the dietary transition from milk to fish identified by the Fourier analysis. We found that pups began supplementing their milk diet with fish at different times between colonies—ranging from 3 to 5 months old (San Esteban Island), 5–7 months old (Santa Margarita Island), and &gt; 12 months old (Los Islotes Island). All pups were &gt; 1 year old when weaned. The longer lactation period in Mexico contrasts with the shorter 10–11 months age at weaning recorded at northern colonies of California sea lions along the US Pacific coast (San Miguel Island). The difference in lactation duration among regions likely reflects latitudinal differences in marine productivity, and a lower nutrition quality of prey available to California sea lions in Mexico. Our study augments the limited knowledge of weaning in California sea lions and provides a means to determine weaning in other species.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152059"},"PeriodicalIF":1.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320118","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":"Advancing DNA-based quantification of Pacific oyster larvae using a HTqPCR multi-marker approach","authors":"Dennis van der Pouw Kraan,&nbsp;Conor T. Graham,&nbsp;Fiona Kavanagh,&nbsp;Luca Mirimin","doi":"10.1016/j.jembe.2024.152055","DOIUrl":"10.1016/j.jembe.2024.152055","url":null,"abstract":"<div><div>Marine bivalves play important roles in seafood supply/security and ecosystems services, with many aquaculture practices relying on wild stocks as sources of larvae. However, rapid and effective monitoring of larvae occurrence, abundance and distribution in the marine environment can be challenging. DNA-based approaches have shown promising results in providing novel monitoring tools. However, the effect of varying sources of different DNA targets and differential representation at distinct larval stages on genetic signal (copy numbers) are poorly understood. The present study used a High-Throughout real-time quantitative PCR (HTqPCR) platform to screen multiple genetic markers (originating from nuclear, ribosomal and mitochondrial genes) in DNA extracts from known number of larvae at two developmental stages (5-day old D-shape and 20-day old pediveliger), using the Pacific oysters (<em>Magallana gigas</em>) as a model study organism. Findings showed clear trends across sources of DNA, with ribosomal markers showing significantly higher numbers of DNA copies compared to mitochondrial markers, which in turn were significantly higher than nuclear markers. A predictable relationship was found between DNA copies found in five-day old D-shape larvae and 20-day old pediveliger larvae, indicating that developmental stages have significant effects on biomass estimation using DNA-derived data. Nuclear and mitochondrial markers showed higher accuracy for estimating higher amounts of larvae, whereas ribosomal markers showed higher accuracy for estimating lower numbers of larvae, suggesting that a multi-marker approach may be most appropriate. While this study provides empirical evidence on the effect of larval stages and source of DNA in quantifying bivalve larvae, it also provides a framework (enabled by a HTqPCR platform) to assess the suitability of DNA-based approaches for the monitoring of marine larvae occurrence as well as biomass.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152055"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312388","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":"Seasonal and age-related variations in egg biomass and fatty acid composition of the common prawn Palaemon serratus","authors":"Jean-Baptiste Baudet ,&nbsp;Benoît Xuereb ,&nbsp;Gauthier Schaal ,&nbsp;Marc Rollin ,&nbsp;Agnès Poret ,&nbsp;Aurélie Duflot ,&nbsp;Léa Jeunet ,&nbsp;Enora Jaffrézic ,&nbsp;Frank Le Foll ,&nbsp;Romain Coulaud","doi":"10.1016/j.jembe.2024.152056","DOIUrl":"10.1016/j.jembe.2024.152056","url":null,"abstract":"<div><p>In crustaceans that live in seasonal environments and produce several broods during an annual cycle, there are generally seasonal patterns in reproductive traits. Thus, females are able to modulate the trade-off between per offspring investment and quantity of eggs produced in order to maximise the fitness of their offspring in response to the environmental conditions they will face during their development. We collected females of <em>Palaemon serratus</em> (<span><span>Pennant, 1777</span></span>) that had just laid eggs during the entire laying season from December 2021 to November 2022 on the coast of Seine-Maritime (France). We measured their fecundity, biomass per egg and the fatty acid composition of the eggs. The largest females laid their eggs from December to March (“winter laying”) and from May to July (“summer laying”), while the smallest females laid from January to August. Fecundity and in general biomass per egg increased with the size of the females. The FA concentration of eggs decreased throughout the laying season and winter eggs were more concentrated in essential PUFAs than summer eggs. In summer, the old females laid eggs with the same biomass as those laid by the young females, enabling them to significantly increase their relative fecundity. All these trends are consistent with the environmental conditions encountered by future embryos and larvae. These results provide a clear illustration of the maternal effects and trade-offs between reproductive traits observed in decapods.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152056"},"PeriodicalIF":1.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000716/pdfft?md5=606e95982f85877e96378699194219e7&pid=1-s2.0-S0022098124000716-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142162111","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":"Competition is stronger between than within species in two coexisting hermit crab species","authors":"Eduardo Everardo Garcia-Cardenas ,&nbsp;Maite Mascaro ,&nbsp;Guillermina Alcaraz","doi":"10.1016/j.jembe.2024.152054","DOIUrl":"10.1016/j.jembe.2024.152054","url":null,"abstract":"<div><p>Both intra- and interspecific competition influence the partitioning of limited resources; the relative importance of each type of competition in resource distribution is influenced by several factors, including resource availability and population abundance. Several hermit crab species of the genera <em>Calcinus</em> and <em>Clibanarius</em> coexist, competing for the shells of the same gastropod species. The relative abundance of these species varies along the intertidal gradient, from a bias toward <em>Clibanarius</em> in the upper intertidal to a tendency toward <em>Calcinus</em> in the lower intertidal. We assessed the strength of intra- versus interspecific competition in <em>Cli</em>. <em>albidigitus</em> and <em>Cal</em>. <em>californiensis</em> by comparing the number of successful usurpations of preferred shells in single-species versus mixed-species trials. We performed these comparisons under four scenarios, varying the total individuals and their relative abundance (1.7:1, 1:1, or 1:1.7 ratio) to simulate demographic conditions along the intertidal gradient. There were more shell usurpations in mixed-species trials under all scenarios except for the 1:1 ratio at high total abundance. <em>Calcinus californiensis</em> usurped more shells than <em>Cli</em>. <em>albidigitus</em> in all mixed-species treatments, even in cases where <em>Cli</em>. <em>albidigitus</em> was more abundant. Our results show that interspecific competition is stronger than intraspecific competition, which could drive the competitive exclusion of <em>Cli</em>. <em>albidigitus</em>, the comparatively weaker species.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152054"},"PeriodicalIF":1.8,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000698/pdfft?md5=5d96a272bccf3884e00e823abcbe912a&pid=1-s2.0-S0022098124000698-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142095897","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":"Resilience to changes in salinity and predator diversity in representative Gulf of Mexico estuarine fish predator-prey interactions","authors":"Scott B. Alford ,&nbsp;Shea A. Husband ,&nbsp;Charles W. Martin","doi":"10.1016/j.jembe.2024.152053","DOIUrl":"10.1016/j.jembe.2024.152053","url":null,"abstract":"<div><p>Predators strongly influence ecological communities and subsequent ecosystem function by directly consuming prey individuals and indirectly by inciting alterations in prey behavior, termed non-consumptive effects (NCEs). Gulf of Mexico estuaries support complex food webs structured by numerous species interactions maintained in constant environmental flux from variation in salinity. Environmental variation presents a source of physiological stress for estuarine fish and plays a role in their distributions and subsequent interactions. Here, we present the results of a mesocosm experiment examining if acute changes in salinity disrupt NCEs of different predators on estuarine prey. We exposed Gulf killifish (<em>Fundulus grandis</em>) to visual and/or olfactory cues from a common estuarine predator, red drum (<em>Sciaenops ocellatus</em>), and from a freshwater predator that is a transient species in lower portions of estuaries, largemouth bass (<em>Micropterus salmoides</em>), under either decreasing, constant, or increasing salinity. Killifish decreased shoal size and movement in response to olfactory cues or both visual and olfactory cues compared to when they were exposed to no cues or visual cues, demonstrating variable perceived risk dependent on cue type. Behavioral response did not vary by predator species, implying a generalized response to different fish predators. Prey did not change behavior when exposed to decreasing salinity compared to constant salinity. However, prey movement increased with increasing salinity, indicating that salinity changes may provide cues to search for different habitats instead of a stressor. Our experiment indicates that estuarine predator-prey interactions may be resilient to acute salinity changes given the broad tolerances of euryhaline species.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152053"},"PeriodicalIF":1.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048323","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":"Changes of glycolysis and gluconeogenesis key enzymes in the muscle of the shrimp Penaeus vannamei in response to hypoxia and reoxygenation","authors":"Dalia G. Cruz-Moreno ,&nbsp;Laura E. Hernández-Aguirre ,&nbsp;Alma B. Peregrino-Uriarte ,&nbsp;Lilia Leyva-Carrillo ,&nbsp;Silvia Gómez-Jiménez ,&nbsp;Carmen Contreras-Vergara ,&nbsp;Jorge Hernández-López ,&nbsp;Gloria Yepiz-Plascencia","doi":"10.1016/j.jembe.2024.152052","DOIUrl":"10.1016/j.jembe.2024.152052","url":null,"abstract":"<div><p>Although the shrimp <em>Penaeus vannamei</em> can tolerate oxygen-limited conditions, the organisms may suffer detrimental effects in several processes, including growth, reproduction, immune responses, and others. During hypoxia, the shrimp makes metabolic adjustments in energy use and glucose homeostasis. Glucose is hydrolyzed during glycolysis and synthesized from non-glycosidic metabolites in gluconeogenesis. Although these pathways share many enzymes, the processes are not exactly the reverse of each other. We studied the first and last irreversible steps of glycolysis and gluconeogenesis catalyzed by hexokinase/glucose-6-phosphatase (HK/G6Pase) and pyruvate kinase/pyruvate carboxylase/phosphoenolpyruvate carboxykinase (PK/PC/PEPCK), respectively, in muscle under hypoxia and hypoxia followed by reoxygenation to gain insights about the coordinated metabolic responses that maintain glucose balance during oxygen stress. For the first group, HK gene expression was induced in hypoxia while G6Pase was reduced in hypoxia and reoxygenation, whereas for enzymes activity, HK was maintained and G6Pase was only detected in reoxygenation. For the second group, gene expression increased in PK in hypoxia, in PC in reoxygenation and in both cases, the enzymatic activities were maintained. Mitochondrial PEPCK expression increased during hypoxia and cytosolic PEPCK decreased, while total PEPCK activity was maintained. Intracellular lactate decreased during hypoxia while glucose levels were maintained. Altogether the results show that in limited oxygen, the expression of glycolytic enzymes-genes are induced, the gluconeogenic counterparts are active, although with more varied responses to oxygen limited conditions, and intracellular glucose levels are maintained.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152052"},"PeriodicalIF":1.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048322","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":"Mitochondrial DNA damage, repair and copy number dynamics of Sclerophytum sp. (Anthozoa: Octocorallia) in response to short-term abiotic oxidative stress","authors":"Gaurav G. Shimpi ,&nbsp;Sergio Vargas ,&nbsp;Bastian Bentlage ,&nbsp;Gert Wörheide","doi":"10.1016/j.jembe.2024.152051","DOIUrl":"10.1016/j.jembe.2024.152051","url":null,"abstract":"<div><p>As a consequence of global climate change, the increasing frequency of environmental disturbances and surplus oxidative stress experienced by coral reefs will likely contribute to phase shifts from stony to soft corals. Mitochondrial response to reactive oxygen species (ROS) -induced oxidative damage appears pivotal for bioenergetic adaptation and recovery during environmental stress, partly governed by mitochondrial DNA copy number. Unlike other animals, octocorals possess unique mitogenomes with an intrinsic DNA mismatch repair gene, the <em>mtMutS,</em> that is likely to have a role in mitochondrial response and mtDNA damage recovery. Yet, there is a general lack of stress response studies on octocorals from a mitochondrial perspective. Here we evaluate the mitochondrial response of the octocoral <em>Sclerophytum</em> sp. subjected to acute elevated temperature and low pH, and its putative competence to reverse oxidative mtDNA damage caused by exogenous agents like hydrogen peroxide (H₂O₂). Temporal changes in mtDNA copy number and mtDNA damage and recovery were monitored. Both short-term thermal and low pH stress applied independently instigated mtDNA damage and affected mtDNA copy number differently, while <em>mtMutS</em> gene was significantly upregulated during low pH stress. mtDNA damage caused by H₂O₂ insult was observed to be promptly reversed in <em>Sclerophytum</em> sp., and a higher mtDNA copy number was associated with lower mtDNA damage. These findings provide insights into the potential role of <em>mtMutS</em> gene in conferring resilience to octocorals, the relevance of mtDNA copy number, and emphasize the importance of better understanding the mitochondrial stress response of cnidarians in the context of climate change.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152051"},"PeriodicalIF":1.8,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000662/pdfft?md5=6f990cd20c0afe302442496a4eee1c0a&pid=1-s2.0-S0022098124000662-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142039798","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":"Environmental and biotic habitat attributes affect rocky intertidal community variability in glacially influenced estuaries","authors":"Madeleine McArthur ,&nbsp;Schery Umanzor ,&nbsp;Julie Schram ,&nbsp;Brenda Konar","doi":"10.1016/j.jembe.2024.152050","DOIUrl":"10.1016/j.jembe.2024.152050","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Climate change is increasing the rate of glacial recession in high latitude coastal environments. The associated increase in cold, sediment-laden freshwater into the nearshore may alter a wide array of water attributes, which will likely have ecosystem-wide impacts. One of these potential impacts is a change in typical patterns of ecological community variability, which can be an indicator of stress in response to an environmental impact. Fluctuation in community composition over multiple temporal scales is natural and can be affected by environmental conditions, as well as by the presence of habitat forming, spatially dominant organisms. The goal of this study was to determine how variation in environmental attributes and spatially dominant species contributes to the seasonal variability of rocky intertidal community assemblages in glacially influenced estuaries. The environmental attributes of interest were both dynamic in nature (water temperature, salinity, dissolved oxygen, turbidity, and pCO&lt;sub&gt;2)&lt;/sub&gt;, and static (substrate type, wave exposure, beach slope, and distance to freshwater). Variation in the proportions of three spatially dominant organisms that are common in many intertidal systems, &lt;em&gt;Mytilus trossulus&lt;/em&gt; (mussels), &lt;em&gt;Balanus&lt;/em&gt; spp. (barnacles), and &lt;em&gt;Fucus&lt;/em&gt; spp. (rockweed) were examined as biotic habitat attributes. It was hypothesized that 1) dynamic environmental attributes would be more strongly correlated to community variability patterns than static attributes, and 2) higher proportions of spatially dominant species would correspond to lower levels of community variability. To document seasonal community variability, as well as proportions of spatially dominant species, percent cover and biomass data were collected along with environmental data from 2019 to 2022. Barnacle cover, rockweed cover, and substrate characteristics (cover of gravel and total cover of bare rock) were significantly correlated to community variability levels based on percent cover data. Community variability levels based on biomass data were significantly correlated to mussel cover, rockweed biomass, substrate aspects (cover of gravel and mud), distance to a freshwater source, and variation in dissolved oxygen levels. Almost all relationships between community variability and each of these attributes were negative, where a greater level of an environmental attribute was associated with lower seasonal variability in community composition. Distance to freshwater and dissolved oxygen variation had a positive relationship to community variability, meaning that greater distance to a freshwater source and variation in dissolved oxygen were associated with higher seasonal community variability. As several of these variability drivers may be affected by climate-related changes, the results of this study provide insights into how glacially influenced rocky intertidal communities may in turn be affected by the progression of climate c","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152050"},"PeriodicalIF":1.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984595","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}