Journal of Experimental Marine Biology and Ecology最新文献

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Kelp-bed dynamics across scales: Expanding distributional analysis capacity with spatial pattern metrics and modelling
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152080
Anne P. St-Pierre, Patrick Gagnon
{"title":"Kelp-bed dynamics across scales: Expanding distributional analysis capacity with spatial pattern metrics and modelling","authors":"Anne P. St-Pierre,&nbsp;Patrick Gagnon","doi":"10.1016/j.jembe.2024.152080","DOIUrl":"10.1016/j.jembe.2024.152080","url":null,"abstract":"<div><div>Spatial pattern metrics are used to investigate the links between a species' distributional patterns and underlying ecological drivers. These metrics, in combination with remotely acquired imagery, offer a novel approach for the study of kelp bed-urchin barren systems and enable the study of fully submerged kelp distribution at broad spatial scales (km<sup>2</sup>) difficult to achieve through traditional scuba-based methods. This study uses aerial imagery of 2.85 km<sup>2</sup> of shallow (&lt;7 m deep) seabed around five islands in the Mingan Archipelago (northern Gulf of St. Lawrence, Canada) to (1) quantify kelp distribution patterns using spatial pattern metrics at large, intermediate, and small spatial scales and (2) examine correlations between kelp presence and physical and biological variables over a broad spatial scale. Imagery was classified visually and divided into two benthic classes: kelp and non-kelp. Variability in spatial pattern metrics and kelp coverage across spatial scales indicated that kelp distribution is not uniform among islands, suggesting that the spatial extent over which observations are obtained strongly influences the patterns detected. Kelp covered 62 % of the entire study area but with substantial variation (46 % to 87 %) among islands. Kelp and non-kelp patches varied in size from 225 to 891,225 m<sup>2</sup>, while exhibiting considerable variation in geometric complexity. Over 80 % of the kelp patches were relatively small (&lt;1350 m<sup>2</sup>), although the fewer, larger patches contained most (98 %) of the kelp-covered seabed and were located in shallower water, near the coastline. Both the kelp and non-kelp benthic classes were highly aggregated as suggested by clumpiness indices of 0.67 and 0.59, respectively. Modelling results showed that increasing depth, urchin density, and relative exposure to waves independently led to a decrease in kelp presence, with depth having the strongest correlation, followed by urchin density and relative exposure. This study expands knowledge of kelp distribution patterns at broad spatial scales largely unexplored for fully submerged species and is a step forward towards a comprehensive understanding of scale-dependent processes regulating their distribution.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152080"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The ecological effects of hard-bottom habitat degradation on the Florida stone crab
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152075
Devon M. Pharo , Donald C. Behringer
{"title":"The ecological effects of hard-bottom habitat degradation on the Florida stone crab","authors":"Devon M. Pharo ,&nbsp;Donald C. Behringer","doi":"10.1016/j.jembe.2024.152075","DOIUrl":"10.1016/j.jembe.2024.152075","url":null,"abstract":"<div><div>Repeated cyanobacterial blooms in Florida Bay have resulted in the degradation of hard-bottom habitat throughout the region. Despite the loss of structure-forming sponges, nothing is known about the effects on the iconic Florida stone crab, <em>Menippe mercenaria</em>, which utilize hard-bottom to shelter and forage. We examined the potential impacts of these algal blooms by comparing crab nutritional condition, trophic position, and site fidelity between bloom-impacted and non-impacted regions. <em>Menippe mercenaria</em> from both regions were of similar nutritional condition; however, δ<sup>15</sup>N stable isotope analysis revealed <em>M. mercenaria</em> to have greater trophic variability in bloom-impacted regions, suggesting crabs in degraded habitats foraged on a wider variety of prey. δ<sup>13</sup>C measurements showed a marked shift between regions, suggesting the source of primary production in these regions differed in δ<sup>13</sup>C values, species composition, or both. Site and den fidelity remained similar; likely due to the abundance of solution holes available as shelters. Overall, results indicate <em>M. mercenaria</em> have high resiliency to the habitat degradation caused by these blooms, but fundamental changes in their trophic ecology suggest that blooms could be causing a broader alteration to these communities.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152075"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161901","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
Comparison of two calcein administration techniques for marking the shell of the blue mussels (Mytilus spp.) infected with pathogenic microalgae Coccomyxa
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152077
Michael Zuykov , Michel Gosselin , Philippe Archambault , Michael Schindler
{"title":"Comparison of two calcein administration techniques for marking the shell of the blue mussels (Mytilus spp.) infected with pathogenic microalgae Coccomyxa","authors":"Michael Zuykov ,&nbsp;Michel Gosselin ,&nbsp;Philippe Archambault ,&nbsp;Michael Schindler","doi":"10.1016/j.jembe.2024.152077","DOIUrl":"10.1016/j.jembe.2024.152077","url":null,"abstract":"<div><div>The presence of the L-shaped shell deformity (LSSD) is a reliable biomineral marker for non-lethal detection of wild blue mussels (<em>Mytilus</em> spp.) infected with the unicellular photosynthetic microalgae <em>Coccomyxa</em> sp. However, the LSSD formation rate is unknown. Most literature regarding bivalve shell sclerochronology advocates the fluorochrome calcein as an ideal growth marker. Administration technique of calcein-seawater solution for mussels, injection into mantle cavity or immersion, influences mark quality and staining. The best technique cannot be predicted in advance. Three circumstances may impact the dyeing success for <em>Coccomyxa</em>-infected mussels: mantle colonization with algae, increase in mucus production and biophysiological control in alga-mussel association. This report examines how injection (in field condition) and immersion (for 2 h - field condition; 20 h - laboratory condition) affect shell marking in adult (60–70 mm shell length) <em>Coccomyxa</em>-infected <em>Mytilus</em> spp. Uninfected wild and farmed mussels are used in parallel experiments for comparative purposes. After the staining procedures (calcein concentration 150 mg L ‐1), mussels were caged for 55 days in the Lower St. Lawrence Estuary (Québec, Canada). Results demonstrate that uninfected mussels showed fluorescent marks regardless of the administration techniques, whereas in <em>Coccomyxa</em>-infected mussels marks were visible only after immersion for 20 h. This may suggest that dyeing success could be managed by unknown aspects of biophysiological control in alga-mussel symbiosis. A comparison of images made in 2019 and 2023 indicates no change in calcein marks brightness 4 years after the end of shell staining experiments.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152077"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161565","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
Intrinsic factors affecting predator failure in crab-gastropod encounters and their implications for repair scar frequencies
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152069
Steven E. Mendonca , Carrie L. Tyler , Kristina M. Barclay , Lindsey R. Leighton
{"title":"Intrinsic factors affecting predator failure in crab-gastropod encounters and their implications for repair scar frequencies","authors":"Steven E. Mendonca ,&nbsp;Carrie L. Tyler ,&nbsp;Kristina M. Barclay ,&nbsp;Lindsey R. Leighton","doi":"10.1016/j.jembe.2024.152069","DOIUrl":"10.1016/j.jembe.2024.152069","url":null,"abstract":"<div><div>Repair scars result from sublethal predator damage which is regrown, permanently recording predator-prey encounters. Although interactions between crabs and gastropods are well studied, it is not clear under what conditions these encounters lead to the generation of repair scars. As failed attacks generate repair scars, here, we use arena experiments to investigate intrinsic factors affecting the likelihood of predator failure using the crab, <em>Cancer productus</em>, and two of its common gastropod prey, <em>Nucella ostrina</em> and <em>Tegula funebralis</em>. Regression models indicate that <em>C. productus</em> was 44 % more likely to fail in encounters with <em>T. funebralis</em> than those with <em>N. ostrina,</em> which may be due to differences in shell strength and shape. In addition, encounters with <em>T. funebralis</em> were much longer in duration than those with <em>N. ostrina,</em> particularly for large prey attacked by small predators. Predator size had a direct effect on attack outcomes, particularly for <em>T. funebralis</em>, and the long duration of encounters suggests that in natural settings, extrinsic factors could potentially have large effects on failure rates. Field data show that <em>T. funebralis</em> populations tend to have greater repair frequencies than do coexisting <em>N. ostrina.</em> We propose that differences in repair frequency between <em>T. funebralis</em> and <em>N. ostrina</em> at the same location are likely due to intrinsic factors. However, repair scar frequencies may also reflect the density of small predators, as repair scars may primarily result from small crabs, which are also more likely to be interrupted by extrinsic factors in natural settings.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152069"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161902","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
Effects of elevated temperature on erosion of Saccharina latissima (Laminariales, sugar kelp) blades
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152071
Xiaowei Ding , Corina P.D. Brussaard , Klaas R. Timmermans
{"title":"Effects of elevated temperature on erosion of Saccharina latissima (Laminariales, sugar kelp) blades","authors":"Xiaowei Ding ,&nbsp;Corina P.D. Brussaard ,&nbsp;Klaas R. Timmermans","doi":"10.1016/j.jembe.2024.152071","DOIUrl":"10.1016/j.jembe.2024.152071","url":null,"abstract":"<div><div>The critical role of kelp as an ecosystem engineer (nutrient cycling, habitat formation) is well recognized but under threat. Recent declines in natural kelp populations worldwide have been linked to global warming-induced rising temperatures of the ocean. There is, however, a noticeable gap in knowledge about the effects of temperature on the erosion of (distal parts of) the kelp blades. This erosion process, where blades tissue is lost, is crucial to understanding kelp health and nutrient dynamics in marine ecosystems. This study aimed to quantify the erosion rate of <em>Saccharina latissima</em> (Laminariales, sugar kelp) blades and the subsequent release of total organic carbon and total nitrogen during erosion under naturally increased temperatures (from 16.1 °C to 22.5 °C) and further elevated temperatures (from 16.1 °C to 27.1 °C). A significant increase in the erosion rate of the distal parts of blades was observed in both temperature treatments. Substantial amounts (4.24 ± 0.31 mg cm<sup>−2</sup> of C and 0.32 ± 0.13 mg cm<sup>−2</sup> of N) of nutrients were released from <em>S. latissima</em>, especially under sub-lethal temperature conditions. Under further elevated temperatures, with a prolonged period of higher temperature and a maximum temperature of 27.1 °C, the effects were stronger, and erosion occurred along the edges of the whole blade. Our findings suggest that rising temperatures accelerate the erosion of <em>S. latissima</em> blades, highlighting a reason for the decline of kelp forests under climate change, as well as the potential impacts on nutrient cycling in the oceans.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152071"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161904","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}
引用次数: 0
Spatial distribution of the intertidal limpet Patella depressa Pennant, 1777: Patterns across wave exposure and season
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152073
Jón T. Magnússon , Ana Silva , Stephen J. Hawkins , José P.M. Paula , Tiago A. Marques , Diana Boaventura
{"title":"Spatial distribution of the intertidal limpet Patella depressa Pennant, 1777: Patterns across wave exposure and season","authors":"Jón T. Magnússon ,&nbsp;Ana Silva ,&nbsp;Stephen J. Hawkins ,&nbsp;José P.M. Paula ,&nbsp;Tiago A. Marques ,&nbsp;Diana Boaventura","doi":"10.1016/j.jembe.2024.152073","DOIUrl":"10.1016/j.jembe.2024.152073","url":null,"abstract":"<div><div>Spatial patterns of intertidal rocky shore gastropods depend on various environmental stresses and biological interactions. Understanding how and why these patterns arise can provide important insights into the ecology and behavior of ecologically key organisms. Here, we addressed the unexplored limpet aggregative behavior and the influence of wave action and season. We assessed intraspecific patterns of the spatial distribution of <em>Patella depressa</em> on rocky shores of contrasting wave exposure in seasons with different levels of storminess in central Portugal. We predicted that intraspecific spatial structure estimated through individual-to-individual nearest neighbor distances (NNDs) would be more aggregated on exposed sites than on sheltered sites and, if season-dependent, such aggregation would be greater during the stormier winter months. Two sheltered sites and two exposed sites were sampled three times in winter and in summer. On each sampling occasion, the mean NNDs were measured digitally in 20 replicated random quadrats (0.25 × 0.25 m). We showed that season and exposure significantly affect the spatial distribution of limpets, with an aggregated spatial structure on exposed sites during the stormy winter months. On sheltered sites, limpets were randomly distributed regardless of season. In contrast, on exposed sites, limpets which were randomly distributed during summer changed to an aggregated structure in the winter. This is the first report of seasonally modulated patterns of spatial distribution associated with wave exposure for <em>P. depressa</em>. Such behavior can influence resource availability and outcomes of competitive interactions, with implications for ecosystem functioning.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152073"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The photosymbiotic acoel Convolutriloba retrogemma (Xenacoelomorpha) is sensitive to thermal stress
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152079
Marcelo C. Querido , Arthur Z. Güth , Amana G. Garrido , Carla Zilberberg , Leonardo P. Cardoso , Paulo Y.G. Sumida , Miguel Mies
{"title":"The photosymbiotic acoel Convolutriloba retrogemma (Xenacoelomorpha) is sensitive to thermal stress","authors":"Marcelo C. Querido ,&nbsp;Arthur Z. Güth ,&nbsp;Amana G. Garrido ,&nbsp;Carla Zilberberg ,&nbsp;Leonardo P. Cardoso ,&nbsp;Paulo Y.G. Sumida ,&nbsp;Miguel Mies","doi":"10.1016/j.jembe.2024.152079","DOIUrl":"10.1016/j.jembe.2024.152079","url":null,"abstract":"<div><div>Multiple marine invertebrate species have been utilized as model organisms for investigations on the effects of climate change and bleaching on animal-algal symbioses. However, one potential model host that has not been addressed is the acoel <em>Convolutriloba retrogemma</em>, which associates with chlorophytes. Therefore, this study assessed whether thermal stress reduces survival, size, symbiont density and chlorophyll-<em>a</em> concentration for <em>C. retrogemma</em>. Acoels were subjected to an experiment to examine the combined effects of temperature (26, 28 and 30 °C) and exposure (1, 2 and 4 weeks) on each of the four variables. The population size and total length of acoels were monitored, followed by sampling and maceration for quantifying symbionts and extracting chlorophyll-<em>a</em>, which was measured using a fluorometer. Results showed significant acoel mortality at both 28 and 30 °C, with populations decreasing by 50 % and 100 %, respectively, after four weeks. Length did not differ among conditions. Acoels underwent bleaching as symbiont density decreased at 30 °C, and chlorophyll-<em>a</em> content decreased at both 28 and 30 °C. In the current context of climate change, the association between <em>C. retrogemma</em> and <em>Tetraselmis</em> sp. appears to be considerably fragile compared to other model organisms. With the predicted increase in marine heatwaves, this holobiont may be severely threatened.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152079"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161563","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
Combined effects of pCO2 and salinity on the silicification of estuarine diatoms
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152078
Wei Duan , Zhen Zhang , Minqi Luo , Huo Xu , Qiang Ou , Fengyuan Chen , Ke Pan
{"title":"Combined effects of pCO2 and salinity on the silicification of estuarine diatoms","authors":"Wei Duan ,&nbsp;Zhen Zhang ,&nbsp;Minqi Luo ,&nbsp;Huo Xu ,&nbsp;Qiang Ou ,&nbsp;Fengyuan Chen ,&nbsp;Ke Pan","doi":"10.1016/j.jembe.2024.152078","DOIUrl":"10.1016/j.jembe.2024.152078","url":null,"abstract":"<div><div>Understanding the combined effects of seawater acidification and salinity is crucial for assessing the adaptation of estuarine organisms to climate change. This study examined the physiological and nanostructural responses of two coastal diatoms, <em>Thalassiosira pseudonana</em> and <em>Thalassiosira weissflogii</em>, under different <em>p</em>CO<sub>2</sub> and salinity conditions. Our results indicated that high <em>p</em>CO<sub>2</sub> and low salinity decreased the biogenic silica and chlorophyll contents in both species. The weakly condensed silicon increased alongside the decrease in biogenic silica under high <em>p</em>CO<sub>2</sub> conditions, with this trend being further amplified in low salinity environments. Meanwhile, the biochemical compositions and nanostructure of the diatom frustules were significantly altered by the lower salinity, leading to reduced cell size and porosity. These changes to diatom physiology and morphology may affect the diatoms' capacity to defend against predators and viruses. This study highlights the chemical and morphological changes occurring in diatom cell walls in future acidic estuarine waters.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152078"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161562","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
Habitat degradation has species-specific effects on the stress response of coral reef fishes
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152070
Eric P. Fakan , Alexia Dubuc , Christopher R. Hemingson , Mark I. McCormick , Andrew S. Hoey
{"title":"Habitat degradation has species-specific effects on the stress response of coral reef fishes","authors":"Eric P. Fakan ,&nbsp;Alexia Dubuc ,&nbsp;Christopher R. Hemingson ,&nbsp;Mark I. McCormick ,&nbsp;Andrew S. Hoey","doi":"10.1016/j.jembe.2024.152070","DOIUrl":"10.1016/j.jembe.2024.152070","url":null,"abstract":"<div><div>Coral reefs are one of the world's most threatened ecosystems, with transition from coral- to algal-dominated habitats becoming increasingly common. While habitat degradation in other ecosystems can lead to heightened stress among individuals, thereby increasing energetic demands and reducing fitness, the effects of habitat degradation on stress and metabolic performance of coral reef fish is unknown. Therefore, we investigated whether cortisol levels (an indicator of stress), metabolic performance, behaviour, and growth, were influenced by habitat quality in three fish species with varying degrees of reliance on live coral. We reared newly-settled fishes (<em>Pomacentrus amboinensis</em>, <em>P. moluccensis</em> and <em>Dascyllus aruanus</em>) for three weeks in one of three habitat treatments: live coral, dead coral covered in turf algae and cyanobacteria, or a combination of the two. After three weeks we quantified each individuals metabolic performance, cortisol concentration, morphology, and habitat use. <em>Pomacentrus moluccensis</em> had higher cortisol concentrations in the dead coral treatment, compared to the live coral, whereas there was no difference in cortisol levels among habitat treatments for <em>P. amboinensis</em> or <em>D. aruanus</em>. Overall, metabolic performance (aerobic scope, standard and maximum metabolic rate) showed no consistent response to habitat treatments. Regarding morphology, we only found <em>D. aruanus</em> to be impacted, with individuals from the live coral treatment having a significantly higher mass than individuals from the dead coral treatment. Behavioural space-use analysis revealed that <em>D. aruanus</em> and <em>P. moluccensis</em> spent more time away from their habitats in the dead coral treatments, whereas the space-use of <em>P. amboinensis</em> was unaffected by habitat degradation. Understanding how coral loss affects stress levels and fitness of reef fishes is critical to predict future reef fish communities. This study highlights that vulnerability of reef fish to coral reef degradation is species-specific, and related to their reliance on live coral. These changes may provide a mechanistic explanation to observed population declines following coral loss and indicate that remaining individuals have reduced fitness potentially compromising the subsistence of future populations.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152070"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161903","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
Unravelling multifactor influences on photosymbiosis within a tropical anthozoan (Isactinia sp.)
IF 1.8 3区 生物学
Journal of Experimental Marine Biology and Ecology Pub Date : 2025-01-01 DOI: 10.1016/j.jembe.2024.152072
Katrina L. Kaposi , Robert L. Courtney , Jamie E. Seymour
{"title":"Unravelling multifactor influences on photosymbiosis within a tropical anthozoan (Isactinia sp.)","authors":"Katrina L. Kaposi ,&nbsp;Robert L. Courtney ,&nbsp;Jamie E. Seymour","doi":"10.1016/j.jembe.2024.152072","DOIUrl":"10.1016/j.jembe.2024.152072","url":null,"abstract":"<div><div>The symbiotic relationship that photosymbiotic anthozoans share with Symbiodiniaceae is an important aspect of not only their health, but the success of the broader ecosystems in which they reside. This relationship is fragile however and is susceptible to perturbations to physiochemical factors within the environment. Using conditions ecologically relevant to the Great Barrier Reef, the aim of this study was to unravel the individual and combined impacts of temperature and salinity on the population density of Symbiodiniaceae within a small tropical sea anemone (<em>Isactinia</em> sp.) over time. A significant interaction between the three factors was identified. While salinity was shown to be the leading cause of symbiont loss within the first week, over the duration of the 21-day study, temperature ultimately emerged as the primary driver of bleaching. The impact on Symbiodiniaceae density varied however, with instances of the density more than doubling under mid-range conditions. Ultimately the results of this study contribute to our understanding of the complex and dynamic nature of photosymbiosis within tropical anthozoans. By thoroughly unravelling the intricacies of the anthozoan-Symbiodiniaceae we are better able to predict how such species may respond to changing environmental conditions into the future.</div></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"582 ","pages":"Article 152072"},"PeriodicalIF":1.8,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161905","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
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