Journal of Experimental Marine Biology and Ecology最新文献

{"title":"Biomarker responses of Mediterranean mussels (Mytilus galloprovincialis, Lamarck 1819) regarding marine mucilage in the Sea of Marmara","authors":"Eda Dagsuyu ,&nbsp;İdil Can Tunçelli ,&nbsp;Refiye Yanardag ,&nbsp;Nuray Erkan ,&nbsp;Özkan Özden ,&nbsp;Didem Üçok ,&nbsp;Şehnaz Yasemin Tosun ,&nbsp;Hande Doğruyol ,&nbsp;Şafak Ulusoy ,&nbsp;Sühendan Mol","doi":"10.1016/j.jembe.2024.152018","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152018","url":null,"abstract":"<div><p>It has been proposed that marine mucilage intensifies the biological effects of chemical pollutants and can increase their bioaccumulation in seafood. Indeed, in 2021, mucilage caused a major environmental disaster in the Sea of Marmara. Limited resources on the possible effects of marine mucilage on sustainable food security have increased the importance of this study. The aim of this study is to investigate the biochemical effects of mucilage in wild and cultured mussels, a bioindicator species collected from four different regions [Istanbul Strait (S1) and Canakkale Strait (S2), Bandirma (S3), Gelibolu (S4)] during the 2021 fishing season in the Sea of Marmara. The levels of reduced glutathione and lipid peroxidation, activities of antioxidant enzymes like glutathione reductase, glutathione-S-transferase, catalase, superoxide dismutase, activities of biomarker enzymes like alanine aminotransferase, aspartate aminotransferase, and lactate dehydrogenase activities were determined. Our findings demonstrated that mucilage had an impact on cellular oxidative state and compromised the lipid cell membranes in the mantle tissues of Mediterranean mussels (<em>Mytilus galloprovincialis,</em> Lamarck 1819). It was found that there is a high positive relationship between seawater temperatures and bioparameters in S2 and S3 regions, except for GSH level. This study puts forward that in the presence of marine mucilage the biological responses and the state of health of mussels are negatively affected. Parameters which exhibit this kind of response may be used as biomarkers of exposure to marine mucilage in wild and culture mussel populations. Environmental disasters such as marine mucilage naturally affect food security by putting the sustainability of these species at risk.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"576 ","pages":"Article 152018"},"PeriodicalIF":2.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140893408","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":"Investigating leatherback surface behavior using a novel tag design and machine learning","authors":"Rick Rogers ,&nbsp;Kate H. Choate ,&nbsp;Leah M. Crowe ,&nbsp;Joshua M. Hatch ,&nbsp;Michael C. James ,&nbsp;Eric Matzen ,&nbsp;Samir H. Patel ,&nbsp;Christopher R. Sasso ,&nbsp;Liese A. Siemann ,&nbsp;Heather L. Haas","doi":"10.1016/j.jembe.2024.152012","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152012","url":null,"abstract":"<div><p>Understanding the surfacing behavior of marine wildlife is an important component for improving abundance estimates derived from visual surveys. We monitored the behavior of 18 leatherback sea turtles (<em>Dermochelys coriacea</em>) in coastal habitats off Massachusetts, USA, using a high-resolution camera and satellite tag package (HiCAS - High Resolution Camera and Satellite) that we assembled from commercially available components which work independently. We used nine data streams derived from the multiple sensors and a video camera to explore four different depth thresholds defining surface zones. We compared classification of video images by a human to classification of those images by a machine learning algorithm. We calculated four metrics to describe surface behavior for each of the nine data streams. The mean percent time at the surface was the only behavior metric that changed systematically as data streams were used to assess different visible depth thresholds, increasing as the depth threshold increased. Other behavior metrics (mean surface duration, mean dive duration and number of surfacing events per hour) were less similar across data streams, making them unreliable for estimating surface availability. This study highlights the need for sustained data collection to better inform the availability bias estimates used to calculate abundance from visual observations.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"576 ","pages":"Article 152012"},"PeriodicalIF":2.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000273/pdfft?md5=de21e26d2a916a84e2b7e1291376dfdb&pid=1-s2.0-S0022098124000273-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140879344","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":"3D printed plant-based biodegradable materials as alternative for PVC panels in monitoring coastal marine communities","authors":"Maria Rosa ,&nbsp;Tristan Ene ,&nbsp;Grace Robinson ,&nbsp;Mitchell Lockwood ,&nbsp;Nicolette Scola ,&nbsp;Gerard D. Gadigian ,&nbsp;Taegan A. McMahon","doi":"10.1016/j.jembe.2024.152015","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152015","url":null,"abstract":"<div><p>Coastal marine environments are some of the most productive and overexploited ecosystems on earth. Coastal ecosystems, like oyster and coral reefs, need physical structures to establish and habitat destruction has led to the destabilization of reef structures resulting in massive biodiversity losses. For decades, researchers have utilized PolyVinyl Chloride (PVC) panels as artificial larval settlement panels to study recruitment and community dynamics in these incredibly important ecosystems. Unfortunately, PVC itself is relatively toxic, the panels are smooth which makes it difficult for larval settlement, and it can take months to see establishment because larvae need settlement cues on PVC from biofilm development. This study assessed the use of 3D printed panels constructed out of plant-based biodegradable materials as an alternative to PVC panels. Panels constructed of three different corn-based polylactic acid (PLA) materials (white impact modified, gray impact modified, wood pulp) were tested at a well monitored site along the Long Island Sound in Connecticut, US. Overall, the 3D printed panels had equal or higher recruitment compared to the PVC panels. Beyond the normal application of panels for ecological assessment of local settlement, this work highlights that using innovative, biodegradable panels has strong potential in reestablishing these overburdened yet critical ecosystems. Additionally, the 3D printed panels were economically beneficial to use, which increases equity in this conservation crisis field as material expense can be cost prohibitive.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"576 ","pages":"Article 152015"},"PeriodicalIF":2.0,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140879321","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":"Antagonistic ecosystem engineering effects differ by seagrass life stage and density of bioturbating shrimp","authors":"Wesley W. Hull,&nbsp;Jennifer L. Ruesink","doi":"10.1016/j.jembe.2024.152016","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152016","url":null,"abstract":"<div><p>Because ecosystem engineers shape environmental conditions, interactions between ecosystem engineers can depend not only on the external environment but on “which species arrives when” within habitats. Yet, while endpoint outcomes for adults at high density have often been investigated, few studies have examined how these interactions change across density and life history stages. We tested for antagonistic engineering effects of the burrowing shrimp <em>Neotrypaea californiensis</em> (Dana, 1852) at a range of densities on eelgrass <em>Zostera marina</em> L.<em>,</em> 1753, including seedlings as well as vegetative shoots. In an observational study, abrupt borders of eelgrass beds were not mirrored by shrimp, and shrimp were never excluded across the full range of observed eelgrass densities, patterns that are inconsistent with alternative stable states. However, eelgrass density declined with increasing shrimp density, and no eelgrass occurred at &gt;336 shrimp m⁻². Survival of eelgrass transplants also declined with increasing shrimp density, and in a manipulative experiment, seedlings declined more rapidly than vegetative shoots within a shrimp bed. Thus, shrimp have strong antagonistic engineering effects on eelgrass that increase with shrimp density and can preclude successful seedling establishment and persistence of vegetative shoots.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"576 ","pages":"Article 152016"},"PeriodicalIF":2.0,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140822447","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":"Hypoxia impairs cellular energy allocation in the juvenile horseshoe crab Tachypleus tridentatus","authors":"Lingfeng Jiang ,&nbsp;Meilian Huang ,&nbsp;Chunhua Liu ,&nbsp;Mohamed H. Abo-Raya ,&nbsp;Xiaowan Ma ,&nbsp;Youji Wang ,&nbsp;Menghong Hu","doi":"10.1016/j.jembe.2024.152010","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152010","url":null,"abstract":"<div><p>Although hypoxia is a serious environmental concern for marine ecosystems globally, its biological effects on the benthic biota remain mostly unclear for some endangered species. To provide an deep understanding of the possible effects of hypoxia on the tri-spine horseshoe crab <em>Tachypleus tridentatus</em>, the cellular energy allocation (CEA) approach was utilized to examine the cellular responses and adaption potential of horseshoe crabs. We examined the energetic responses of <em>T. tridentatus</em> under low dissolved oxygen level (2 mg O₂/L). The horseshoe crabs first experienced 14 days of hypoxic stress, and then recovered in a normal dissolved oxygen environment for 7 days. On the 7th and 14th day of hypoxic exposure, the levels of available energy, electron transport system activity, protein, lipids, and carbohydrates were decreased in <em>T. tridentatus</em> (<em>p</em> &lt; 0.05). All measured parameters in the hypoxic group partially or completely recovered after seven days of re‑oxygenation, reaching a level that was significantly up-regulated (<em>p</em> &lt; 0.05) compared with the 14th day and non-significantly different from the 0th day exposure (<em>p</em> ˃ 0.05). In conclusion, hypoxic stress has adverse effects on the energy balance of juvenile <em>T. tridentatus</em>, but these adverse effects can be alleviated in a short recovery period. As a result, our findings provide novel perspectives on the physiology of <em>T. tridentatus</em> under hypoxia acclimation, which is essential information for establishing ideal conditions for the cultivation of this endangered species.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"575 ","pages":"Article 152010"},"PeriodicalIF":2.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140633398","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":"Biased dry weight: The matter of residual water in seven pelagic tunicate species","authors":"Florian Lüskow ,&nbsp;Tanya Balaji ,&nbsp;Evgeny A. Pakhomov","doi":"10.1016/j.jembe.2024.152013","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152013","url":null,"abstract":"<div><p>Pelagic tunicates are cosmopolitan and, at times, highly abundant members of open-ocean ecosystems that are important for food web dynamics and biogeochemical cycling. Ecosystem models often use wet weights to parameterize biota. This may be erroneous for gelatinous plankton, such as pelagic tunicates, with high water content, compared to crustaceans. Furthermore, poorly quantified residual water should also be corrected when using dry weights for parameterization. This study aims to estimate the residual water content (as well as elemental and organic contents) for seven tunicate species. Tunicates (one pyrosome and six salps, <em>N</em> = 107), were collected during several research expeditions and analyzed for inter- and intraspecific variability. The H-surplus method was applied for the residual water content calculation. The residual water ranged from 1.5 to 20.6% (average ± SD: 8.9 ± 4.2%) of dry weight across species and did not differ significantly between taxonomic orders. Furthermore, the life cycle stage (blastozooid versus oozooid) and tissue type (tunic versus whole organism) were found to be insignificant in explaining residual water content patterns. Elemental and organic contents, however, were lower in tunics than in whole organisms, and in the salp <em>Thetys vagina</em>, stomachs had significantly higher elemental and organic contents compared to whole organisms. Effects of size and drying method (oven versus freeze-drying) significantly impacted the residual water content of pelagic tunicates. Accounting for residual water content in zooplankton is discussed from an ecological perspective and is strongly advised for future modeling studies.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"575 ","pages":"Article 152013"},"PeriodicalIF":2.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000285/pdfft?md5=30a8408dc03a29bceccbde161e514deb&pid=1-s2.0-S0022098124000285-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140631536","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":"Intra- and interannual variation in the foraging behavior of common Murres (Uria aalge) in the Central California current","authors":"Sean Gee ,&nbsp;Pete Warzybok ,&nbsp;Michael E. Johns ,&nbsp;Jaime Jahncke ,&nbsp;Scott A. Shaffer","doi":"10.1016/j.jembe.2024.152011","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152011","url":null,"abstract":"<div><p>Seabirds modify their behavior during the breeding season as they transition from incubation (self-feeding) to chick-rearing (self-feeding + chick provisioning) periods, which affects parental foraging patterns and distribution. However, it is less clear how much flexibility parents have to modulate their behavior when environmental conditions are unusually poor. Using GPS loggers and time depth recorders, we examined the foraging flexibility of common murres (<em>Uria aalge</em>) at Southeast Farallon Island as adjustments were made between breeding phases and across consecutive years (2019 and 2020) with contrasting oceanographic conditions (i.e. prominent marine heatwave in 2019). Foraging trips were longer during the incubation period (2019: 31.7 ± 20.1 h; 2020: 23.5 ± 7.2 h) compared to the chick provisioning period (2019: 12.2 ± 9.9 h; 2020: 7.5 ± 8.3 h). Moreover, parents generally ventured farther from the colony during incubation (2019: 34.7 ± 17.6 km; 2020: 30.1 ± 11.5 km) than when foraging to provision chicks (2019: 22.6 ± 17.1 km; 2020: 14.1 ± 15.0 km) in each year. Nevertheless, overall foraging ranges had a high degree of overlap (&gt; 60%) within breeding phases and across years, suggesting that murres at this colony are constrained by the habitats primarily based on foraging range. Murres dove deeper during incubation compared to chick-rearing in 2020 (36.0 ± 24.4 vs 19.5 ± 15.2 m), but there were no other differences within or across years in diving behavior, suggesting that diving effort was less affected by breeding stage. Interannual differences in foraging behavior only occurred during chick-feeding trips and were likely driven by the prey species present. For example, rockfish were more common in chick diets in 2020, when ocean temperatures were cooler compared to 2019. Despite similarities in trip parameters between years, breeding productivity was much lower in 2019 compared to both long-term averages and the 2020 season, suggesting a potential constraint on murre behavioral flexibility when oceanographic variation occurs. These results emphasize the importance of examining behavior on multiple time scales to gain a better understanding of how predators respond to changes in their environment.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"575 ","pages":"Article 152011"},"PeriodicalIF":2.0,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000261/pdfft?md5=7f725b8855e6edf278cd09fc07184151&pid=1-s2.0-S0022098124000261-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140622129","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":"Combined effects of thermal stress and symbiont identity on carbon flux in a model cnidarian-dinoflagellate symbiosis","authors":"Evan M. Heit,&nbsp;Simon K. Davy","doi":"10.1016/j.jembe.2024.152009","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152009","url":null,"abstract":"<div><p>Reef corals rely on their symbiotic relationship with dinoflagellates of the family Symbiodiniaceae for their metabolic energy demands, but this relationship is sensitive to thermal stress which can induce bleaching. We investigated the flux of ¹⁴C-labeled photosynthate in the sea anemone <em>Exaiptasia diaphana</em> (‘Aiptasia’) - a model for the cnidarian-dinoflagellate symbiosis - under low, control and high temperatures (15, 25, 33 °C) when colonized by either its native symbiont <em>Breviolum minutum</em> or the non-native but thermally tolerant <em>Durusdinium trenchii</em> or <em>Breviolum psygmophilum. B. psygmophilum</em> formed the most thermally stable symbiosis, maintaining a higher population density, and fixing and translocating similar or more carbon than the other two species at both high and low temperatures. In contrast, anemones containing <em>D. trenchii</em> markedly bleached at both high and low temperatures, confirming the sensitivity of this host-symbiont pairing to thermal extremes. Elevated temperature led to a significant increase in the percentage of fixed carbon (%) translocated from the symbiont to the host with both <em>Breviolum</em> species, however the total amount of carbon released to the host by the symbiont population (translocated C <em>per</em> mg of host protein) remained consistent between elevated and control temperatures due to the reduced rate of total photosynthetic carbon fixation. The highest rates of photosynthesis and carbon translocation by the symbiont population were seen at the low temperature, reflecting the maintenance or elevation of photosynthesis and/or symbiont density relative to the control. Overall, our findings underscore the significance of symbiont identity in conjunction with host-symbiont specificity in dictating the thermal resilience of the cnidarian-dinoflagellate symbiosis and emphasizing the potential of <em>B. psygmophilum</em> as an interesting candidate for future studies.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"575 ","pages":"Article 152009"},"PeriodicalIF":2.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140558751","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":"Comment: A reexamination of Johnston et al., 2023, bed-scale impact and recovery of a commercially important intertidal seaweed","authors":"Robin Hadlock Seeley ,&nbsp;Sarah Hardy ,&nbsp;Nancy K. Prentiss ,&nbsp;Walter H. Adey","doi":"10.1016/j.jembe.2023.151984","DOIUrl":"https://doi.org/10.1016/j.jembe.2023.151984","url":null,"abstract":"<div><p>Johnston et al., 2023 (Bed-scale impact and recovery of a commercially important intertidal seaweed. J. Exp. Mar. Biol. Ecol. 561) report that rockweed biomass recovers to pre-harvest levels one year after commercial harvest. The Johnston et al. study has two major problems in design, execution, and interpretation of results: 1) industry partner conflict of interest and statistically undetectable impact of the harvest treatment on <em>Ascophyllum nodosum</em> (rockweed) beds, 2) incomplete statistical analysis with inappropriate inferential conclusions about biomass recovery of harvested rockweed beds. Our analysis of their data shows that the only regions of the coast where rockweed biomass recovered to pre-harvest levels are the three regions where the harvest treatment was never detectable. In the one region where the harvest treatment was detectable, rockweed biomass did not recover to pre-harvest levels in a year. Rockweed is a foundational species in the rocky intertidal food web as well as an ecosystem engineer. The improper interpretation by Johnston, et al. of the study data is misleading ecosystem managers and the public about the impacts of commercial rockweed harvests. Most concerning, this paper sets a false foundation for marine policy on commercial rockweed harvesting in Maine.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"574 ","pages":"Article 151984"},"PeriodicalIF":2.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098123001168/pdfft?md5=24ac887c0aaef1ea68321ff8ca4228fb&pid=1-s2.0-S0022098123001168-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140539399","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":"The role of food value on host use by the herbivorous amphipod Sunamphitoe pelagica","authors":"Aynara R. Andrade ,&nbsp;Caio A. Paula ,&nbsp;Fosca P.P. Leite ,&nbsp;Tânia M. Costa ,&nbsp;Glauco B.O. Machado","doi":"10.1016/j.jembe.2024.152007","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152007","url":null,"abstract":"<div><p>Mesograzers often use macrophytes as both food and habitat and may have strong effects on primary producers. In this context, understanding the factors mediating their interaction with macrophytes, such as host food value, is an important step to predict the impacts of these herbivores on aquatic ecosystems. The amphipod <em>Sunamphitoe pelagica</em> is a mesograzer with distribution restricted to a few brown macroalgal hosts, however it is unclear if food value drives host use by this mesograzer. Herein, we investigated the distribution of <em>S. pelagica</em> and the food value of its hosts. For that, the abundance of <em>S. pelagica</em> on the macroalgae <em>Sargassum filipendula</em>, <em>Padina gymnospora</em>, and <em>Dichotomaria marginata</em> was evaluated seasonally in a subtidal rocky shore at Fortaleza Beach (23°32′S, 45°10′W), state of São Paulo, Brazil. Furthermore, we conducted laboratory experiments to test feeding preference and rate, as well as the performance (e.g. survival, growth, and reproductive potential) of <em>S. pelagica</em> using the same macroalgal hosts used in the field abundance investigation. Overall, the mesograzer was more abundant on the brown macroalgae <em>Sargassum</em> and <em>Padina</em> than on the red macroalga <em>Dichotomaria</em>. In both feeding preference and rate experiments, <em>S. pelagica</em> consumed more <em>Sargassum</em> and <em>Padina</em> than <em>Dichotomaria</em>. Moreover, the consumption of <em>Padina</em> and <em>Sargassum</em> resulted in high performance of this mesograzer, while juveniles raised on <em>Dichotomaria</em> had a low survival, perishing within few days of experiment. These results suggest the host use by <em>S. pelagica</em> is strongly driven by the food value of macroalgal hosts and are in accordance with the narrow host breadth of this mesograzer. Therefore, considering the vulnerability of large macroalgae to climate change and habitat alterations, the restricted host use by <em>S. pelagica</em> to few brown macroalgae may increase its risk of local extinction.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"574 ","pages":"Article 152007"},"PeriodicalIF":2.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308613","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}