Journal of Experimental Marine Biology and Ecology最新文献

{"title":"Garibaldi (Hypsypops rubicundus) from artificial reefs and cooler island natural reefs consume more animal material, which is associated with greater adult size and body condition","authors":"Brenda E. Fuentes Calderon ,&nbsp;Jacob L. Eagleton ,&nbsp;Chelsea M. Williams ,&nbsp;Jeremy T. Claisse","doi":"10.1016/j.jembe.2024.152048","DOIUrl":"10.1016/j.jembe.2024.152048","url":null,"abstract":"<div><p>Access to and quality of dietary resources can affect marine fish life history metrics as ingested prey are transformed into the energy and nutrients used for growth and life-sustaining activities. Here, we analyze the diet composition of Garibaldi (<em>Hypsypops rubicundus</em>) populations across natural and artificial rocky reefs subject to a wide range of environmental conditions within the Southern California Bight (SCB). The diet of populations from the warmer islands and mainland natural reefs had higher proportions of algae, while the diet of populations from cooler island natural reefs and mainland artificial reefs had higher proportions of animal content. More animal material in the diet was positively associated with higher body condition in both sexes, larger adult average length, and higher initial growth rates, with relationships generally being stronger in females. These results support the role of the habitat-related variation in diet as a driver of local differences in growth patterns and body condition and provide a more comprehensive description of Garibaldi's omnivorous diet. These findings also provide implications for performance assessments of artificial reef habitats.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152048"},"PeriodicalIF":1.8,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000637/pdfft?md5=e7668532ba185df021b3b091852ae950&pid=1-s2.0-S0022098124000637-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141964573","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":"Regional differences in the effects of watershed glacial coverage on the performance of Pacific Blue mussel, Mytilus trossulus","authors":"Gracelyn Ham ,&nbsp;Scott Gabara ,&nbsp;Preslee Chase ,&nbsp;Brenda Konar ,&nbsp;Schery Umanzor","doi":"10.1016/j.jembe.2024.152043","DOIUrl":"10.1016/j.jembe.2024.152043","url":null,"abstract":"<div><p>Climate change is causing atmospheric warming, leading to increasing global temperatures. Warming is especially evident in high latitude regions, leading to losses in glacial mass and consequences downstream. Pacific Blue mussels are a vital species in such downstream coastal environments where they provide services such as stabilizing substrate, facilitating energy transfer, and supporting the mariculture industry and subsistence communities. As glaciers continue to melt, it is unknown how and to what extent the projected glacial runoff will affect intertidal mussel performance. To determine the effects of glacial melt on mussel performance, mussel morphometrics (weight, length, width), mussel adhesion force, shell breaking force, and growth rates were recorded over five months at nine sites whose watersheds span a gradient of glacial coverage (0–60%) in the Gulf of Alaska (GOA). Five sites were used in Kachemak Bay (Southcentral Alaska) and four sites in Lynn Canal (Southeast Alaska). Overall, adhesion force and shell breaking force decreased with increasing glacial coverage of watersheds. However, oceanic proximity and input appear to buffer against the effects of glacial melt as mussels in the more oceanic Kachemak Bay region had higher adhesion and shell breaking forces relative to the mussels in the less oceanic Lynn Canal region. Within the more oceanic Kachemak Bay region, mussel growth rates decreased with increasing glacial coverage of watersheds. In contrast, mussel growth rates generally increased at sites with increasing glaciation of watersheds in the less oceanic Lynn Canal region. Overall, our results suggest that glacial melt is altering conditions in the nearshore marine environment and reducing mussel performance.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"580 ","pages":"Article 152043"},"PeriodicalIF":1.8,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000583/pdfft?md5=043f23d7a9d6e4570477cab32da794ce&pid=1-s2.0-S0022098124000583-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141979348","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":"Coupling effects of CO2-induced ocean acidification and nitrogen enrichment on growth, photosynthesis and nitrogen utilization of an invasive seaweed (Sargassum muticum)","authors":"Fang Yan ,&nbsp;Zhengzheng Lv ,&nbsp;Huichao Jiang ,&nbsp;Hongyan Wu ,&nbsp;Xiukai Song ,&nbsp;Xiangyang Jiang ,&nbsp;Chen Gao ,&nbsp;Menglin Bao ,&nbsp;Shasha Zang ,&nbsp;Zhiguang Xu ,&nbsp;Lijuan Liu","doi":"10.1016/j.jembe.2024.152049","DOIUrl":"10.1016/j.jembe.2024.152049","url":null,"abstract":"<div><p><em>Sargassum muticum</em>, an invasive seaweed, has colonized many parts of the world along the coast. Marine environment invaded by this species is aggravated the complexity by CO₂-induced ocean acidification (OA) and coastal eutrophication. However, the coupling effects of seawater acidification and eutrophication on this invasive species remain unclear. In this study, we cultured <em>Sargassum muticum</em> at two concentrations of <em>p</em>CO₂ (420 ppmv, LC and 1000 ppmv, HC) and nitrate (10 μM, LN and 200 μM, HN) for 16 days, to investigate the coupling effects of CO₂-induced seawater acidification and nitrate enrichment on growth and photosynthesis of <em>Sargassum muticum</em>. The results showed that high CO₂ increased the relative growth rate (RGR) of alga by 58.9% under LN condition, while such increment was not found under HN condition. Thus, the highest RGR was emerged in the HCLN treatment. The photosynthetic rate curve under different inorganic carbon concentrations (P<img>C curve) presented that high CO₂ increased the maximum inorganic carbon utilization rate (<em>V</em>_max) by 8.1% under HN condition; while inhibited it by 29.8% under LN condition. The affinity to inorganic carbon, reflected by the half-saturation constant (<em>K</em>_0.5), was improved significantly by high CO₂ and/or high nitrate, compared with LCLN treatment. The photosynthetic rate curves under different irradiances (P<img>I curve) suggested that the maximum photosynthetic rate (<em>P</em>_max) of alga was enhanced remarkably by high N, and kept unaffected by high CO₂. The lowest value of dark respiration rate (<em>R</em>_d) was found in HCLN treatment, and there was no significant difference among the other three treatments. Additionally, an increase chlorophyll <em>a</em> content caused by high N was only found in HC treatment. After 16 d culture, nitrate reductase activity (NRA) of algae in HN treatments decreased significantly, compared with those in LN treatments. Furthermore, high CO₂ enhanced NRA dramatically only in algae grown at LN level. Correspondingly, the lowest nitrate uptake rate (NUR) was found in LCHN treatment, and there was no significant difference among the other three treatments. In conclusion, our results showed that elevated CO₂ enhanced the RGR, and the coupling of high CO₂ and nitrate affected the photosynthesis and NUR, however did not synergistically promote growth of <em>S. muticum</em>. Therefore, we speculate that the future OA may exacerbate the invasiveness of <em>S. muticum</em>; nevertheless, the eutrophication of seawater would not amplify this effect.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"579 ","pages":"Article 152049"},"PeriodicalIF":1.8,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141933884","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":"Temporal dynamics of microbial communities in the water of polyculture pond system for Chinese swimming crab Portunus trituberculatus","authors":"Qian Huang ,&nbsp;Meng Li ,&nbsp;Sha Xu ,&nbsp;Caiwen Li","doi":"10.1016/j.jembe.2024.152047","DOIUrl":"10.1016/j.jembe.2024.152047","url":null,"abstract":"<div><p>Microorganisms as the vital component of aquaculture ecosystems, were involved in nutrient cycling, water quality regulation, and the health of cultured species. In this study, aquatic water samples were collected monthly to reveal microbial community compositions, functions, and interactions in different habitats (pond and waterway) during the culture stages of the Chinese swimming crab <em>Portunus trituberculatus</em> in Shandong Province. Due to the semi-closed conditions with limited water exchange, the <em>α</em> diversities were lower in the polyculture pond. The relative abundances of the dominant phyla varied dramatically, and most biomarkers were identified in the polyculture pond. The <em>β</em> diversity of the microbial communities significantly differed among culture stages and habitats. Furthermore, the heterogeneity of prokaryotic microorganisms was greater than that of eukaryotic microorganisms. In the polyculture pond, the microbial community was sensitive to nutrient cycling, with abundant functions related to “photoautotrophy”, “nitrogen_respiration” and “nitrate_respiration”, corresponding to <em>P. trituberculatus</em> culture activities. The <em>co</em>-occurrence network of the microbial community in the polyculture pond tended to be looser than that in the waterway, with a lower number of taxa and correlations. In addition, these networks had nonrandom patterns and formed “small world” topological structures. The low-abundance genera with a higher level of betweenness centrality scores were the hubs or connectors in the networks and might play an essential role in microbial community composition. Furthermore, potential pathogens (<em>Vibrio</em>, <em>Acholeplasma</em>, <em>Photobacterium</em>, and <em>Flavobacterium</em>) deserve more attention during <em>P. trituberculatus</em> culture. This study will be useful for understanding microbial communities in polyculture pond systems and will provide a reference for the health aquaculture of <em>P. trituberculatus</em>.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"579 ","pages":"Article 152047"},"PeriodicalIF":1.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141933885","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":"Lethal and sub-lethal responses of rocky shore gastropods to extreme temperatures","authors":"H.M. Parry-Wilson ,&nbsp;P.B. Fenberg ,&nbsp;S.J. Hawkins ,&nbsp;N. Mieszkowska","doi":"10.1016/j.jembe.2024.152044","DOIUrl":"10.1016/j.jembe.2024.152044","url":null,"abstract":"<div><p>Intertidal communities are more frequently experiencing extreme air and sea temperatures as a result of anthropogenic climate change, with heatwaves increasing in intensity and duration. Most studies exploring the thermal tolerances of intertidal species to extreme temperatures haven't directly studied early life stages. We explored whether locally extreme tide-out temperatures were lethally impacting premature Boreal (<em>Littorina littorea</em> and <em>Steromphala cineraria</em>) and Lustanian (<em>Phorcus lineatus</em> and <em>Steromphala umbilicalis</em>) intertidal gastropod species from southwest England. Two separate experiments tested lethal and sub-lethal responses to simulated local heatwave and cold spell temperatures. Two sensitive early size classes (new recruits and year 1+ juveniles) for each species were exposed to simulated extreme and ambient tide-out temperatures in replicated boulderfield (air) and rockpool (seawater) microhabitats per experiment. Realistic experimental temperatures were determined by EnvLogger temperature data recorded locally in sun-exposed, shaded and rockpool intertidal habitats. For each nine-day experiment, specimens were exposed for six hours daily to four laboratory thermal treatments simulating both ambient conditions and extreme temperature events. These experiments were designed to test the following questions: are premature trochids and littorinids more sensitive to extreme temperatures than adults, and is there a difference in response between species of Boreal and Lusitanian origin sampled from the same geographical region? We identified that the premature intertidal trochid species may not be more thermally sensitive than adults, although premature <em>L. littorina</em> may have a slightly lower lethal heat limit. Survivorship in extreme heatwave air temperatures (40.0–42.9 °C) was lowest for lowshore and highest for highshore species, relating directly to species' vertical shore zonation. There were minimal to zero mortalities in all other thermal treatments. Following stress-induced inactivity in the extreme heatwave air temperature treatment, <em>S. cineraria</em> and <em>P. lineatus</em> specimens all died. In contrast, <em>L. littorea</em> and <em>S. umbilicalis</em> specimens recovered in some instances. Intensifying and more frequent aerial heatwave events occurring unseasonably are likely to cause population declines, local extinctions or subtidal retreat for premature lowshore Boreal intertidal species, influencing recruitment to adult populations, especially where rockpools are not present to provide thermal refugia. Conversely, mid-highshore Lusitanian species are likely to be more resilient to high air temperatures during low tides. Cold spell temperatures did not lethally or sub-lethally impact any juvenile gastropod species, suggesting Lusitanean species will thrive as a result of increasingly milder winters.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"579 ","pages":"Article 152044"},"PeriodicalIF":1.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000595/pdfft?md5=031fe50c5ada3befabca42b6ae65db66&pid=1-s2.0-S0022098124000595-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141933949","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":"Interacting effects of local and global stressors on mussel beds and ecosystem functioning","authors":"Charlotte Carrier-Belleau ,&nbsp;Félix Lauzon ,&nbsp;Jérémie Boucher-Fontaine ,&nbsp;Scott Tiegs ,&nbsp;Mathieu Cusson ,&nbsp;Frédéric Guichard ,&nbsp;Christian Nozais ,&nbsp;Philippe Archambault","doi":"10.1016/j.jembe.2024.152046","DOIUrl":"10.1016/j.jembe.2024.152046","url":null,"abstract":"<div><p>Biogenic habitats, such as mussel beds, provide various functions in their associated ecosystems. However, these habitat-forming species are exposed to cumulative impacts as the number and diversity of anthropogenic stressors increase, particularly in estuarine ecosystems. Experiments designed to test the effect of single and multiple interacting stressors on mussel beds and associated biotic components are rare (i.e. in situ experiments are uncommon, as they usually occur in laboratory settings). We conducted a field experiment in the St. Lawrence estuary (Québec, Canada) to address this gap. We transplanted blue mussels (<em>Mytilus</em> spp.) to mimic mussel beds and exposed them to increased nutrient concentrations and thermal stress at three intervals (6.5, 10.5 and 15 weeks) during May through September. For each transplant, we evaluated epizoic microalgal biomass (as pigment biomass), microbial activity and oxygen uptake, and mortality levels and energy content in the tissues of <em>Mytilus</em> spp. following three exposure times. No effects were found for chlorophyll <em>a</em> biomass, microbial activity and oxygen uptake, and mortality in mussels. In contrast, we found thermal stress and nutrient input interacted to create antagonistic and synergistic effects on energy content in <em>Mytilus</em> spp. at different exposure times and exerted additive effects over time on phaeopigments and the ratio of chlorophyll <em>a</em>/phaeopigments. Our work highlights the importance of combining multiple biological components (i.e. multiple biological responses measured at different scales of biological complexity) and different experimental approaches to capture the complexity behind stressor interactions.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"579 ","pages":"Article 152046"},"PeriodicalIF":1.8,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000613/pdfft?md5=a25bf0484e1ebbe5ff43b01316187922&pid=1-s2.0-S0022098124000613-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141951441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth and ecophysiology of two Antarctic benthic predators; Isotealia antarctica and Urticinopsis antarctica.","authors":"Nadia Frontier ,&nbsp;Joseph Marlow ,&nbsp;Adriana Giles ,&nbsp;Simon A. Morley ,&nbsp;Melody S. Clark ,&nbsp;Lloyd S. Peck","doi":"10.1016/j.jembe.2024.152045","DOIUrl":"10.1016/j.jembe.2024.152045","url":null,"abstract":"<div><p>There is a dearth of basic life history and physiological data from Southern Ocean species, particularly from benthic vagile predators. This is an important data gap because species inhabiting the Southern Ocean live in a more temperature stable but seasonally varying environment than temperate and tropical counterparts. For many species living below 0 °C for a significant proportion of the year, bodily functions are slowed to disproportionately lower rates than would be predicted by temperature alone. Certain life history and physiological processes are often aligned with the short summer season of productivity. However, predators may behave differently because they are decoupled from the phytoplankton bloom and some have been shown to exhibit less seasonal physiological change. To further our understanding of Antarctic predator growth and seasonal ecophysiology, field growth rates were measured for two soft-bodied Antarctic anemone benthic predators, <em>Isotealia antarctica</em> and <em>Urticinopsis antarctica,</em> using <em>in situ</em> sampling of anemones on uniquely marked tiles. <em>Ex situ</em> measurements of oxygen consumption and seven-day faecal output were obtained from recently collected specimens in aquaria and compared between summer and winter. Winter physiological data for Antarctic species are rare, and we tested the hypothesis that generalist feeders or predators continue to feed during the winter. Growth rates differed between species and between years. <em>I. antarctica</em> and <em>U. antarctica</em> both exhibited overall positive field growth rates across a 15 month period between 2020 and 2021; with <em>U. antarctica</em> increasing 199.80% (± SE 25.8) in mass compared to a 16.85% (± SE 8.9) increase in <em>I. antarctica</em>. There was no significant difference in <em>I. antarctica</em>'<em>s</em> growth between 15 and 25 months field deployment. After 25 months, <em>I. antarctica</em> showed an average 7.96% (± SE 8.05) increase in buoyant weight. <em>Ex situ</em> oxygen consumption and faecal egestion did not differ seasonally, which, demonstrates that anemones fed at similar rates during the winter and summer. In contrast to some members of the Antarctica benthos, <em>I. antarctica</em> and <em>U. antarctica</em> actively feed all year round, whereas several other species have been reported to enter a state of torpor in winter.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"579 ","pages":"Article 152045"},"PeriodicalIF":1.8,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000601/pdfft?md5=bd51213e294a1f4fd01de319e9850b7f&pid=1-s2.0-S0022098124000601-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141951442","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":"How close can we get to seeing the private lives of fur seals and sea lions? Experimental UAV flights on the Southern Brazilian coast","authors":"Natália Procksch ,&nbsp;Murilo Guimarães ,&nbsp;Marcela Regina Trindade ,&nbsp;Paulo Henrique Ott ,&nbsp;Martin Sucunza Perez ,&nbsp;Maurício Roberto Veronez ,&nbsp;Larissa Rosa de Oliveira","doi":"10.1016/j.jembe.2024.152042","DOIUrl":"10.1016/j.jembe.2024.152042","url":null,"abstract":"<div><p>Recent advances in unmanned aerial vehicle (UAV) technology have made them a popular and accessible tool for wildlife research. Despite their popularity, there are some concerns about their potential negative impacts due to the possibility of causing disturbance to the species being monitored. We assessed the potential behavioral disturbance of low altitude UAVs on South American fur seals (<em>Arctocephalus australis</em>) and sea lions (<em>Otaria flavescens</em>) on a haulout site in southern Brazil (Wildlife Refuge of Ilha dos Lobos (WRIL)) between October 2022 and August 2023. Behavioral responses of each individual toward the UAV were classified (no response, vigilant or movement) and individuals were also classified according to their species. The probability of individuals expressing each one of the three behaviors at each altitude was assessed by Binomial and Multinomial Mixed Models. We flew a small UAV (DJI Air 2S) vertically above 731 South American sea lions, including 131 adult males, 590 subadult males and 10 juveniles; and 121 South American fur seals, including one subadult, one juvenile and 119 yearlings. For sea lions, vigilant and movement responses represented only 7.70% and 0.36% of behaviors observed during vertical approaches. South American fur seals appeared less perturbed by UAV presence, as only 1.56% of observed behaviors were classified as vigilant, and no movement responses were observed during vertical approaches. Similar results were found during horizontal flights over these species. The most frequent behavior observed in both species was no response, with a probability higher than 0.89 during vertical and horizontal approaches with drones, even at lower altitudes. Based on these results, we recommend that due to their benefits and minimal impact on the studied species, UAV monitoring studies of South American pinnipeds be conducted at a minimum altitude of 30 m at non-breeding sites, especially at haulout sites.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"579 ","pages":"Article 152042"},"PeriodicalIF":1.8,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141638582","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":"Development of new methods for attaching pop-up satellite archival tags to blue sharks (Prionace glauca)","authors":"Yasuko Semba ,&nbsp;Yuki Fujinami ,&nbsp;Akira Kurashima","doi":"10.1016/j.jembe.2024.152041","DOIUrl":"10.1016/j.jembe.2024.152041","url":null,"abstract":"<div><p>Pop-up satellite archival tags (PSATs) have been widely used to study the behavior, habitat selection, and survival rates of sharks. Longitudinal data on shark behavior is needed to understand seasonal migration, spatiotemporal shifts of distribution with the ontogenetic/reproductive stage and the long-term impact of anthropogenic activities. Therefore, long-lasting techniques to secure PSATs to the body of the subject with little harm to its survival are essential. We developed four methods for externally attaching PSATs on the deck to blue sharks (<em>Prionace glauca</em>) in the northwestern Pacific and evaluated the performance of several different methods in terms of tag retention and post-release mortality. Analysis of time-to-event data suggested differences in tag retention rates (here, ‘survival rates’) among the attachment methods. Our Method C, whereby an umbrella-type dart was inserted into the dorsal musculature, penetrating the vertical septum, and the tag body was positioned along anteroposterior body axis and secured to the first dorsal fin base using a cable tie, provided the best performance among the four methods in terms of greater restricted mean survival time (RMST), higher rate of days at liberty, moderate post-release mortality, and less time required for attachment. A meta-analysis based on data published to date indicated that the ‘one-point attachment’ method has been the main approach with blue sharks, and that the tag survival rate differs largely depending on the type of dart head and tether configuration even in the same approach. The RMST from Method C was slightly greater than that with one-point attachment method with an ‘umbrella dart–monofilament or fluorocarbon tether’ combination, which was the most frequently used across previous studies, but the one-point attachment method with a ‘Wilton dart (large or small) or titanium dart–stainless steel tether’ combination outperformed methods compared. Combining available information on the biology of this species with the results of the current study, we propose the following procedure as the most effective to decrease drag and prevent swinging of the tag: pretreat the tag with an anti-biofouling agent; position the tag along the anteroposterior axis of the shark's body; allow the dart to penetrate the vertical septum of the subject; and, additional fixation of the tag to the dorsal fin. Although further data are needed to evaluate some aspects (e. g., dart-head type and tagging location), application of appropriate steps depending on the situation will increase the probability of obtaining long-term data for this highly migratory species.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"579 ","pages":"Article 152041"},"PeriodicalIF":1.8,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141638581","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":"Escape temperature of the intertidal zone porcelain crab Petrolisthes cinctipes does not acclimatize to temperature, but is dependent on body condition, reproductive status and injuries","authors":"Cesar Estrada Aguila,&nbsp;Jonathon H. Stillman","doi":"10.1016/j.jembe.2024.152038","DOIUrl":"https://doi.org/10.1016/j.jembe.2024.152038","url":null,"abstract":"<div><p>Temperature influences population distribution, body size and metabolism, making it a driving ecological and evolutionary factor. Due to global climate change, sea surface temperatures are expected to increase by 1.8–3.5 °C and extreme weather is anticipated to be more intense and frequent by the end of the century. These changes will impact many organisms, especially those exposed to steep environmental gradients and living near their environmental tolerance limits, such as organisms living in intertidal zone habitats. Therefore, climate change is expected to have a large effect on intertidal zone species and such effects have already been demonstrated in several locations across the globe. During a one-year study, we examined how seasonal habitat temperature variation and body condition influence the temperature sensitivity of intertidal zone porcelain crabs. The temperatures that elicited avoidance behavior (i.e., escape temperatures) were measured in the field to capture the physiological state of crabs acclimatized to the natural habitat. Seasonal microhabitat temperature did not influence escape temperature, nor did maximum microhabitat temperatures during the 4 days prior to assay, indicating a lack of thermal plasticity for escape temperature. Escape temperatures were positively correlated with body condition and influenced by the presence of injuries. Overall, this research contributes to an understanding of thermal acclimatization of intertidal zone marine invertebrates and how they may behaviorally respond to thermal pressures brought on by climate change.</p></div>","PeriodicalId":50197,"journal":{"name":"Journal of Experimental Marine Biology and Ecology","volume":"578 ","pages":"Article 152038"},"PeriodicalIF":1.8,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022098124000534/pdfft?md5=711b2b1cc9274516911910f034556522&pid=1-s2.0-S0022098124000534-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141605305","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}