Journal of Experimental Marine Biology and Ecology最新文献

{"title":"The influence of spatial context on prey manipulation behaviors in the California moray eel (Gymnothorax mordax)","authors":"Maya M. McElfish ,&nbsp;Liliana R. Pruett ,&nbsp;Rita S. Mehta","doi":"10.1016/j.jembe.2024.152067","DOIUrl":"10.1016/j.jembe.2024.152067","url":null,"abstract":"<div><div>Predation strategies are shaped by multiple factors, such as prey type, prey density, and/or abiotic conditions. However, limited research has investigated the role of spatial constraints on post-capture behaviors. Our aim was to assess the impact of spatial context on prey manipulation in the California moray eel (<em>Gymnothorax mordax</em>), a crevice forager with a diverse prey handling repertoire. We first compared the duration engaged in specific manipulation behaviors between spatially “enclosed” and “open” foraging environments, followed by a comparison of tightly enclosed spaces that were scaled to individual moray diameter. We observed that the durations spent engaged in specific manipulation behaviors varied based on spatial context. Despite these changes, total feeding time, which consists of both manipulating and swallowing prey, did not vary across treatments. These results highlight the behavioral flexibility of morays, suggesting that they can adjust prey manipulation strategies for specific spatial contexts without compromising overall feeding duration. We additionally documented two previously undescribed behaviors (tail and body anchoring) which seem to be used in the narrowest treatments for leverage when knotting behavior was not possible due to spatial constraints. This research provides valuable insight into the foraging ecology of this locally abundant apex predator and aids in furthering our understanding of predator-prey interactions in the benthic community within the kelp forest ecosystem.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152067"},"PeriodicalIF":1.8,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661602","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":"Microphytobenthic responses to endobenthic bioturbator density, temperature and eutrophication in a global change mesocosm experiment","authors":"C.M. Thomas ,&nbsp;G.A.V. Maniel ,&nbsp;K. Gilmour ,&nbsp;A.E. Oyatoye ,&nbsp;H.G. Marco ,&nbsp;D. Pillay","doi":"10.1016/j.jembe.2024.152066","DOIUrl":"10.1016/j.jembe.2024.152066","url":null,"abstract":"<div><div>The microphytobenthos (MPB) is a key determinant of ecological processes occurring in coastal sediments, where it functions as a trophic resource, sediment stabiliser and mediator of nutrient cycling and bentho-pelagic coupling. Endobenthic bioturbators are also important components of coastal sediments, wherein they influence ecosystem functioning principally through high sediment and pore-water manipulation rates. However, understanding of how endobenthic engineer activities influence MPB components, especially in the context of global change processes, is limited. We made use of a factorial mesocosm experiment and an in situ optical tool (BenthoTorch) to quantify responses of cyanobacteria, green-algae, diatoms and total MPB biomass to (1) eutrophic vs mesotrophic and (2) high vs low temperature conditions at increasing densities of sandprawns (<em>Kraussillichirus kraussi</em>). These crustaceans are highly influential endobenthic engineers in southern Africa, being widely distributed in estuaries, lagoons and embayments. Findings from our experiment indicated that total MPB biomass and that of cyanobacteria and diatoms (the dominant constituents of MPB assemblages in mesocosms) decreased from controls to maximum sandprawn-density treatments, but predominantly under low temperature. Sediment boundary roughness increased with sandprawn density, suggesting that sandprawn effects on MPB biomass and that of cyanobacteria and diatoms under low temperature was likely sediment mediated, with deposition of residual burrow sediment to the sediment-water interface reducing microalgal productivity. All MPB metrics declined with high temperature, suggesting a physiological intolerance of the MPB assemblages to upper thermal conditions in our experiment or nutrient limitation due to temperature-induced increases in metabolism. Our findings highlight the potential for rising temperature to reduce MPB biomass, as has been reported for open ocean and lake phytoplankton assemblages. Our results also highlight the functional significance of sandprawns in structuring MPB assemblages in coastal ecosystems, but their sediment-mediated limitation of benthic cyanobacterial biomass may confer a degree of resilience to coastal benthic ecosystems against harmful cyanobacterial blooms.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152066"},"PeriodicalIF":1.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586393","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":"Light exposure induces phenotypic plasticity of the upside-down jellyfish Cassiopea sp. and its endosymbiotic dinoflagellates","authors":"Rebecca Salas ,&nbsp;Colin J. Anthony ,&nbsp;Bastian Bentlage","doi":"10.1016/j.jembe.2024.152068","DOIUrl":"10.1016/j.jembe.2024.152068","url":null,"abstract":"<div><div>The upside-down jellyfish, <em>Cassiopea,</em> is an increasingly popular model organism gaining prominence for both its endosymbiotic dinoflagellates from the family Symbiodiniaceae and its behavioral changes of bell pulsations associated with environmental cues. Pulsation provides a unique window into the host's response to environmental conditions, a typically difficult to access component of other symbiotic cnidarians. Pulsation has also been hypothesized to play a regulatory role on the endosymbiotic assemblage, but the magnitude of this regulatory effect is not well understood. Here, we used two light-acclimation experiments to help disentangle the complex phenotypic responses of the cnidarian host and its endosymbiotic dinoflagellates. The first experiment examined the phenotypic plasticity (size, behavior, color) of <em>Cassiopea</em> sp. in response to repeated ambient light acclimation trials to determine the rate and magnitude of phenotypic plasticity. The second experiment compared the acclimation response of jellyfish across three experimental groups to test whether a short acclimation time destabilized the host-endosymbiont relationship. Our goal was to identify covarying host-endosymbiont phenotypes to gain new insights into the dynamics of this relationship. We employed flow cytometric phenotypic profiling for high-throughput phenotypic characterization of endosymbiotic dinoflagellates in addition to pulse-amplitude modulated (PAM) fluorometry to characterize photosynthetic efficiency (Fv/Fm). Host phenotypes responded predictably to light-dark cycles and stabilized after nine to twelve days of exposure to consistent light conditions. However, disruption of this acclimation period affected the holobiont's phenotypic profile. We also found evidence that phenotypic responses of the host and endosymbionts were generally decoupled, indicating a stronger regulatory response of light conditions on phenotypes than possible host-regulatory strategies on the endosymbiotic assemblage. This study provides unique insights into the acclimation strategies of upside-down jellyfish, an emerging model for the study of cnidarian-dinoflagellate symbiosis.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152068"},"PeriodicalIF":1.8,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586392","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":"Effects of experimental manipulations of the density of a key grazer Cymbula granatina on rocky-shore community composition in the Benguela ecosystem, South Africa","authors":"Ndiviwe G. Baliwe ,&nbsp;Maya C. Pfaff ,&nbsp;George M. Branch","doi":"10.1016/j.jembe.2024.152065","DOIUrl":"10.1016/j.jembe.2024.152065","url":null,"abstract":"<div><div>Densities of a commonly-harvested intertidal limpet <em>Cymbula granatina</em> were manipulated at two sites within a no-take marine protected area on the west coast of the Cape Peninsula in South Africa, using four treatment levels ranging from zero to maximum natural densities, together with control plots, to evaluate the effects of different harvesting intensities on rocky-shore community composition. Following removal or thinning of <em>C. granatina</em>, community composition changed: cover of corticated and ephemeral algae increased and that of encrusting corallines decreased. As limpet density fell, abundance of the brown encrusting alga <em>Pseudoralfsia verrucosa</em> increased on rock but decreased on shells. These outcomes were, however, dependent on the time frames considered, as macroalgae underwent annual cycles, and the effects of limpet removal were evident predominantly during the summer upwelling season when macroalgae proliferated. There are important management implications arising from these finding, notably that any reductions of this limpet to levels below 50 % of natural densities will profoundly alter community composition, particularly increasing macroalgae while decreasing encrusting corallines, with likely secondary effects on succession and recruitment of other species.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152065"},"PeriodicalIF":1.8,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561304","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":"Modeling growth of multiple recruitment cohorts of Dungeness crab co-occurring within the central Salish Sea","authors":"Claire E. Cook ,&nbsp;Sarah K. Grossman,&nbsp;Julie S. Barber","doi":"10.1016/j.jembe.2024.152064","DOIUrl":"10.1016/j.jembe.2024.152064","url":null,"abstract":"<div><div>The carapace dimensions of Dungeness crab (<em>Metacarcinus magister</em>) at a given molt stage vary greatly throughout their range. Although growth models have been developed for various coastal Dungeness crab populations, the patterns of growth for juvenile Dungeness crab in the central Salish Sea remain largely unknown. Larval Dungeness crab within this area are believed to be sourced from at least two different cohorts, distinguished by timing of arrival to the region and differences in carapace dimensions. The co-occurrence of multiple cohorts complicates efforts to understand the population dynamics of this critically important species. Thus, in 2019 we began rearing larvae from two phenotypically-distinct cohorts under common conditions in the laboratory to evaluate differences in carapace dimension, intermolt period, and molt increment. Mixed-effect model analyses of growth metrics collected at the individual level revealed that cohort-of-origin had a significant effect on growth at all levels, despite the presence of individual varying growth effects. Overall, late cohort individuals were found to molt more frequently albeit at smaller increments. These individuals are projected to grow slower initially, yet they may have the ability to effectively catch up in size through additional molt events. Through this experiment, we demonstrated that cohort-specific growth schedules were maintained regardless of the influence of temperature and food availability. Our results suggest that timing of settlement and size at settlement could have an outsized effect on overall growth, potentially resulting in variable time to reach significant milestones, such as sexual maturity or harvest size.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152064"},"PeriodicalIF":1.8,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535959","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":"Turning the tide: Rhythmic aggregation behaviour in Anurida maritima (Collembola) is entrained by inundation","authors":"Martijn J.T.N. Timmermans ,&nbsp;Madeleine King ,&nbsp;Diane Purchase ,&nbsp;Benjamin J.A. Dickins ,&nbsp;Thomas E. Dickins ,&nbsp;Stephen Kett","doi":"10.1016/j.jembe.2024.152062","DOIUrl":"10.1016/j.jembe.2024.152062","url":null,"abstract":"<div><div>Numerous foreshore species evolved the ability to predict tidal change and adjust behaviour and metabolism accordingly. The intertidal collembolan <em>Anurida maritima</em> (Guérin-Méneville, 1836) shows endogenously controlled rhythmic changes in behaviour that anticipate the tides. Animals forage during low tide and hide in large aggregations in the substrate during high tide. Here, artificial tidal environments and time-lapse photography were used to investigate if this behaviour is responsive to key environmental cues. It is shown that the precise rhythmicity of aggregation behaviour is dependent on periodic inundations. In the absence of such inundations, rhythmic aggregation patterns dissipate and are no longer accurate after 14 days. Slowly shifting the artificial tides, showed that rhythmic aggregation behaviour in <em>A. maritima</em> is responsive and adjusts to a newly-imposed tidal regimen. This suggests that the species has the ability to synchronise to newly encountered tidal conditions under natural conditions. The findings provide a robust foundation for advancing detailed chronobiological research on <em>A. maritima</em> as a model organism to gain a deeper understanding of biological time-keeping.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152062"},"PeriodicalIF":1.8,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434202","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 season, size, and sex on tolerance of a simulated cold snap in latitudinally separated populations of the poleward-invading green porcelain crab (Petrolisthes armatus)","authors":"Kevin J. Mack ,&nbsp;Dara H. Wilber ,&nbsp;Amy E. Fowler ,&nbsp;Robert D. Podolsky","doi":"10.1016/j.jembe.2024.152063","DOIUrl":"10.1016/j.jembe.2024.152063","url":null,"abstract":"<div><div>Poleward range expansion in the green porcelain crab <em>Petrolisthes armatus</em> is thought to be associated with rising coastal water temperatures along the southern Atlantic Bight. Periods of anomalous cold temperature (“cold snaps”), however, could delay or limit further expansion, especially if northern populations are unable to adjust cold tolerance through adaptation or acclimation. We tested cold tolerance in crabs from four latitudes, from Savannah, GA to North Inlet, SC, along the species' poleward invasion front. Laboratory incubation trials were conducted in multiple seasons using adult, non-ovigerous <em>P. armatus</em> to compare cold temperature thresholds between populations, sexes, and sizes. These trials recorded temperature thresholds for induction of both sublethal (loss of righting response) and lethal effects. Following acclimation, crabs were exposed to a rapid (1 °C d⁻¹) temperature drop, modeled after water temperatures recorded during a severe winter cold snap in Charleston Harbor, SC. Crabs generally experienced mobility loss below 8 °C and mortality below 4 °C. In trials at the end of fall, crabs from the two more northern populations survived significantly longer, consistent with latitudinal differences in temperature as crabs prepared physiologically for winter. At the end of summer, crabs from the northernmost population showed greater cold resilience in both lethal and sublethal measures. At the end of spring, when animals are reproductive, there were mixed results with regard to a latitudinal pattern. When differences between sexes and sizes were significant, females were less susceptible than males and, in all but one case, smaller individuals were less susceptible than larger. In general, crabs at the start of winter maintained mobility and survived longer in the cold snap than they did when tested in the other two seasons. Although cold snaps may reduce population sizes of <em>P. armatus</em>, increased cold tolerance of more poleward populations could help to facilitate range expansion, especially if increasingly mild winter conditions move their thermal barrier toward higher latitudes.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152063"},"PeriodicalIF":1.8,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425247","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":"Contribution of harbor seal derived nutrients to Saccharina beds assessed using δ15N","authors":"Takanori Kuribayashi ,&nbsp;Noriko Azuma ,&nbsp;Shun Ikuta ,&nbsp;Mari Kobayashi","doi":"10.1016/j.jembe.2024.152061","DOIUrl":"10.1016/j.jembe.2024.152061","url":null,"abstract":"<div><div>Although seaweed beds along the northern coast of Japan have generally deteriorated, algal beds have remained where nutrients are continuously supplied from inflows and/or animal aggregations. Here, we show that NH₄-N assimilated in kelp (<em>Saccharina angustata</em>) was derived from harbor seals (<em>Phoca vitulina stejnegeri</em>) on the reef of Cape Erimo, Hokkaido which is the largest breeding ground of this species in Japan, using isotopical and molecular techniques. Coastal waters of Erimo area generally have high nutrient concentrations in winter and low nutrient concentrations from spring to autumn. On the other hand, in the reef area of Cape Erimo where the harbor seal haul-out occurs, high concentrations of DIN and DIP, high contribution of NH₄-N to DIN continued after winter, and environmental DNA analysis revealed that seal-derived DNA was simultaneously high. The mean <em>δ</em>¹⁵N value of <em>S. angustata</em> in the reef area of Cape Erimo was 8.8 ± 0.9 ‰ (<em>n</em> = 14) which was enriched compared to the mean <em>δ</em>¹⁵N value of 6.9 ± 0.6 ‰ (<em>n</em> = 75) sampled from other coastal areas of Erimo. The mean TN content of <em>S. angustata</em> in the reef area of Cape Erimo was also 2.0 ± 0.1 % (<em>n</em> = 14), which was higher than the mean TN content of 1.6 ± 0.2 % (<em>n</em> = 75) sampled from other coastal areas of Erimo. The thallus size of <em>S. angustata</em> collected from the reef area of Cape Erimo was larger than samples collected from the other sampling points where the thallus size decreased from June to August. These results indicated that the harbor seal was a significant source of NH₄-N absorbed by kelp, acting as a vector for supplying nutrients to nutrient poor coastal ecosystem probably through excrement and detrital material from prey items. Thus we conclude that harbor seals, as the top predator of the food web, play an important role as a bottom-up control in the ecosystem.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"581 ","pages":"Article 152061"},"PeriodicalIF":1.8,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425248","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":"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}