Pub Date : 2024-02-15eCollection Date: 2024-03-01DOI: 10.1093/plankt/fbad060
Per Hedberg, Markus Olsson, Helena Höglander, Volker Brüchert, Monika Winder
In highly seasonal systems, the emergence of planktonic resting stages from the sediment is a key driver for bloom timing and plankton community composition. The termination of the resting phase is often linked to environmental cues, but the extent to which recruitment of resting stages is affected by climate change remains largely unknown for coastal environments. Here we investigate phyto- and zooplankton recruitment from oxic sediments in the Baltic Sea in a controlled experiment under proposed temperature and light increase during the spring and summer. We find that emergence of resting stage differs between seasons and the abiotic environment. Phytoplankton recruitment from resting stages were high in spring with significantly higher emergence rates at increased temperature and light levels for dinoflagellate and cyanobacteria than for diatoms, which had highest emergence under cold and dark conditions. In comparison, hatching of copepod nauplii was not affected by increased temperature and light levels. These results show that activation of plankton resting stages are affected to different degrees by increasing temperature and light levels, indicating that climate change affects plankton dynamics through processes related to resting stage termination with potential consequences for bloom timing, community composition and trophic mismatch.
{"title":"Climate change effects on plankton recruitment from coastal sediments.","authors":"Per Hedberg, Markus Olsson, Helena Höglander, Volker Brüchert, Monika Winder","doi":"10.1093/plankt/fbad060","DOIUrl":"https://doi.org/10.1093/plankt/fbad060","url":null,"abstract":"<p><p>In highly seasonal systems, the emergence of planktonic resting stages from the sediment is a key driver for bloom timing and plankton community composition. The termination of the resting phase is often linked to environmental cues, but the extent to which recruitment of resting stages is affected by climate change remains largely unknown for coastal environments. Here we investigate phyto- and zooplankton recruitment from oxic sediments in the Baltic Sea in a controlled experiment under proposed temperature and light increase during the spring and summer. We find that emergence of resting stage differs between seasons and the abiotic environment. Phytoplankton recruitment from resting stages were high in spring with significantly higher emergence rates at increased temperature and light levels for dinoflagellate and cyanobacteria than for diatoms, which had highest emergence under cold and dark conditions. In comparison, hatching of copepod nauplii was not affected by increased temperature and light levels. These results show that activation of plankton resting stages are affected to different degrees by increasing temperature and light levels, indicating that climate change affects plankton dynamics through processes related to resting stage termination with potential consequences for bloom timing, community composition and trophic mismatch.</p>","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"46 2","pages":"117-125"},"PeriodicalIF":2.1,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10987100/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140855209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-02eCollection Date: 2024-03-01DOI: 10.1093/plankt/fbad058
Yanasivan Kisten, Michelle Kruger, Nadine A Strydom
The tidal occurrence of larval fishes was investigated in the permanently open Kowie Estuary on the warm-temperate coast of South Africa. Larval fishes were sampled in the mouth region using two drifting light traps deployed on the ebb and flood tides every second night for two consecutive 14-day periods, coinciding with the dark moon phase. A total of 553 larval fishes were caught, representing nine families and 26 species, of which Blenniidae and Clupeidae dominated. The prevalence of different estuarine association fish guilds was also tide-specific. Marine and estuarine species, such as Omobranchus woodi, were more dominant during flood tides, while marine straggler species, such as Sardinops sagax, which are not dependent on estuaries, were dominant on the ebb tide. Marine estuarine-dependents were only present during flood tides, potentially indicating ingress and entrainment within the estuary. The results confirm that light trap catches yield a different composition of species compared to towed ichthyoplankton net studies. Additionally, drifting light traps allow for better targeting of species with a phototactic response and reduction of incidental catch. Consequently, a mixture of gear is encouraged for more comprehensive surveys of larval fish occurrence.
{"title":"Occurrence of larval fishes sampled by drifting light traps in the lower reaches of a South African estuary.","authors":"Yanasivan Kisten, Michelle Kruger, Nadine A Strydom","doi":"10.1093/plankt/fbad058","DOIUrl":"https://doi.org/10.1093/plankt/fbad058","url":null,"abstract":"<p><p>The tidal occurrence of larval fishes was investigated in the permanently open Kowie Estuary on the warm-temperate coast of South Africa. Larval fishes were sampled in the mouth region using two drifting light traps deployed on the ebb and flood tides every second night for two consecutive 14-day periods, coinciding with the dark moon phase. A total of 553 larval fishes were caught, representing nine families and 26 species, of which Blenniidae and Clupeidae dominated. The prevalence of different estuarine association fish guilds was also tide-specific. Marine and estuarine species, such as <i>Omobranchus woodi,</i> were more dominant during flood tides, while marine straggler species, such as <i>Sardinops sagax,</i> which are not dependent on estuaries, were dominant on the ebb tide. Marine estuarine-dependents were only present during flood tides, potentially indicating ingress and entrainment within the estuary. The results confirm that light trap catches yield a different composition of species compared to towed ichthyoplankton net studies. Additionally, drifting light traps allow for better targeting of species with a phototactic response and reduction of incidental catch. Consequently, a mixture of gear is encouraged for more comprehensive surveys of larval fish occurrence.</p>","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"46 2","pages":"174-182"},"PeriodicalIF":2.1,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10987099/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140874680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fast-sinking zooplankton carcasses and fecal pellets appear to contribute significantly to the vertical transport of particulate organic carbon (POC), partly because of low temperature that decreases microbial degradation during the descent into the deep ocean. Increasing hydrostatic pressure could further reduce the degradation efficiency of sinking POC, but this effect remains unexplored. Here, the degradation of carcasses and fecal pellets of the abundant marine copepod Calanus finmarchicus was experimentally studied as a function of pressure (0.1–100 MPa). Samples were either exposed to elevated pressure in short 1-day incubations or a gradual pressure increase, simulating continuous particle sinking during a 20-day incubation. Both experiments revealed gradual inhibition of microbial respiration in the pressure range of 20–100 MPa, corresponding to 2–10-km depth. This suggests that hydrostatic pressure impedes carbon mineralization of fast-sinking carcasses and fecal pellets and enhances the deep-sea deposition rate of zooplankton-derived organic material.
{"title":"Hydrostatic pressure impedes the degradation of sinking copepod carcasses and fecal pellets","authors":"Belén Franco-Cisterna, Peter Stief, Ronnie N Glud","doi":"10.1093/plankt/fbae002","DOIUrl":"https://doi.org/10.1093/plankt/fbae002","url":null,"abstract":"Fast-sinking zooplankton carcasses and fecal pellets appear to contribute significantly to the vertical transport of particulate organic carbon (POC), partly because of low temperature that decreases microbial degradation during the descent into the deep ocean. Increasing hydrostatic pressure could further reduce the degradation efficiency of sinking POC, but this effect remains unexplored. Here, the degradation of carcasses and fecal pellets of the abundant marine copepod Calanus finmarchicus was experimentally studied as a function of pressure (0.1–100 MPa). Samples were either exposed to elevated pressure in short 1-day incubations or a gradual pressure increase, simulating continuous particle sinking during a 20-day incubation. Both experiments revealed gradual inhibition of microbial respiration in the pressure range of 20–100 MPa, corresponding to 2–10-km depth. This suggests that hydrostatic pressure impedes carbon mineralization of fast-sinking carcasses and fecal pellets and enhances the deep-sea deposition rate of zooplankton-derived organic material.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139668995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study provides detailed information on the morphometry and distribution of some rare tintinnids species found in the Indian Ocean. The morphological features (scabbard-shaped with a fenestrated collar) reported here resemble those of the genus Stelidiella. Here, lorica morphology (fenestra arrangement and oral margin (OM) pattern) was the sole criteria for Stelidiella species identification. The dimensions and morphology (presence of two layers of fenestrae rings with smooth OMs) resemble the original description of Stelidiella fenestrata, a warm-water species. We found both small (260 μm long) and large S. fenestrata (309 μm long) with smaller and larger bowls in the former and latter, respectively. In the Indian Ocean, S. fenestrata was more abundant (i) between 12oN and 18oS (particularly, central Indian Ocean) similar to that reported in the Pacific Ocean; (ii) in the mesopelagic zone (100–1000 m) than the epipelagic zone (0–100 m) and (iii) in the winter season of December 2021–January 2022 than in spring inter-monsoon of March–May 2021. The S. fenestrata, despite being in low abundance (2–26 individuals 10 m−3), is widespread in the region, and their role in the ecosystem merits further investigation.
{"title":"First report of the rare tintinnid genus Stelidiella Kofoid and Campbell 1929 in the Indian Ocean","authors":"T P Sarun, Jagadish S Patil","doi":"10.1093/plankt/fbae001","DOIUrl":"https://doi.org/10.1093/plankt/fbae001","url":null,"abstract":"This study provides detailed information on the morphometry and distribution of some rare tintinnids species found in the Indian Ocean. The morphological features (scabbard-shaped with a fenestrated collar) reported here resemble those of the genus Stelidiella. Here, lorica morphology (fenestra arrangement and oral margin (OM) pattern) was the sole criteria for Stelidiella species identification. The dimensions and morphology (presence of two layers of fenestrae rings with smooth OMs) resemble the original description of Stelidiella fenestrata, a warm-water species. We found both small (260 μm long) and large S. fenestrata (309 μm long) with smaller and larger bowls in the former and latter, respectively. In the Indian Ocean, S. fenestrata was more abundant (i) between 12oN and 18oS (particularly, central Indian Ocean) similar to that reported in the Pacific Ocean; (ii) in the mesopelagic zone (100–1000 m) than the epipelagic zone (0–100 m) and (iii) in the winter season of December 2021–January 2022 than in spring inter-monsoon of March–May 2021. The S. fenestrata, despite being in low abundance (2–26 individuals 10 m−3), is widespread in the region, and their role in the ecosystem merits further investigation.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"58 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139668874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Kuroshio–Oyashio transitional zone (KOTZ), constituting the complex water–mass structure surrounding the oceanfront system, is one of the most important fisheries grounds in the western North Pacific. It serves as spawning and nursery sites among several commercially important fish species that consume appendicularians, particularly during the larval stages. In the present study, we investigated the species composition, abundance and biomass of appendicularian assemblages at 20 stations in the KOTZ in the summer of 2018. Appendicularian communities, including 24 species belonging to 7 genera—the highest record for the western North Pacific—were divided into three groups, corresponding to the anticyclonic eddy, a trough between the eddy and the Kuroshio Extension, and the rest of the study area. Statistically, the temperature within the surface layer and strength of water turbulence appear to strongly affect the quantitative and qualitative characteristics of the appendicularian community structure in the KOTZ. This relationship could be attributed to the effect of temperature on the population size and species coexistence, potentially offering an advantage for appendicularians in the future warming ocean scenario and the role of water turbulence in the predatory impact exerted by carnivores on appendicularians.
{"title":"Community structure and distribution pattern of appendicularians in the Kuroshio–Oyashio transitional zone during summer","authors":"Riki Sato, Taketoshi Kodama, Kiyotaka Hidaka","doi":"10.1093/plankt/fbad056","DOIUrl":"https://doi.org/10.1093/plankt/fbad056","url":null,"abstract":"The Kuroshio–Oyashio transitional zone (KOTZ), constituting the complex water–mass structure surrounding the oceanfront system, is one of the most important fisheries grounds in the western North Pacific. It serves as spawning and nursery sites among several commercially important fish species that consume appendicularians, particularly during the larval stages. In the present study, we investigated the species composition, abundance and biomass of appendicularian assemblages at 20 stations in the KOTZ in the summer of 2018. Appendicularian communities, including 24 species belonging to 7 genera—the highest record for the western North Pacific—were divided into three groups, corresponding to the anticyclonic eddy, a trough between the eddy and the Kuroshio Extension, and the rest of the study area. Statistically, the temperature within the surface layer and strength of water turbulence appear to strongly affect the quantitative and qualitative characteristics of the appendicularian community structure in the KOTZ. This relationship could be attributed to the effect of temperature on the population size and species coexistence, potentially offering an advantage for appendicularians in the future warming ocean scenario and the role of water turbulence in the predatory impact exerted by carnivores on appendicularians.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"329 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aurora Gaona-Hernández, Eduardo Suárez-Morales, Lorena Linacre, Jesus C Compaire, J Rubén Lara-Lara, Sharon Z Herzka
Calanoid copepods (CC) are key contributors to the biological carbon pump and pelagic trophic dynamics. The deep-water regions of Perdido and the Bay of Campeche in the western and southern Gulf of Mexico (GM), respectively, differ in hydrography and productivity, leading to potential differences in copepod biomass and community structure. Zooplankton (0-200 m) were collected from the shelf edge to the deep-water region during the winter and summer autumn 2016. Calanoids contributed 38-60% of total zooplankton biomass and 55-70% of overall copepod abundance. The Bay of Campeche had the highest total zooplankton biovolume (287±120 ml 1000 m−3) and total mean copepod abundance (CC and non-calanoids ~146,000 ind. 1000 m−3) during summer-autumn, likely resulting from cross-shelf nutrient transport fueling local productivity. Adult females dominated calanoid numerical abundance (43-50%), thus suggesting a high reproductive potential. Cluster analysis showed differences between seasons (~40% dissimilarity) but not regions. Environmental conditions explained 22% of the variability in community composition; the winter assemblage was significantly related to oxygen concentrations, whereas the summer-autumn community was related to warmer conditions and higher integrated chlorophyll-a concentrations. The CC community responded to seasonal changes more than regionally related hydrographic differences, with likely implications for organic matter cycling and export.
{"title":"Seasonal variability drives differences in the structure of the calanoid copepod community in two contrasting regions of the Gulf of Mexico","authors":"Aurora Gaona-Hernández, Eduardo Suárez-Morales, Lorena Linacre, Jesus C Compaire, J Rubén Lara-Lara, Sharon Z Herzka","doi":"10.1093/plankt/fbad057","DOIUrl":"https://doi.org/10.1093/plankt/fbad057","url":null,"abstract":"Calanoid copepods (CC) are key contributors to the biological carbon pump and pelagic trophic dynamics. The deep-water regions of Perdido and the Bay of Campeche in the western and southern Gulf of Mexico (GM), respectively, differ in hydrography and productivity, leading to potential differences in copepod biomass and community structure. Zooplankton (0-200 m) were collected from the shelf edge to the deep-water region during the winter and summer autumn 2016. Calanoids contributed 38-60% of total zooplankton biomass and 55-70% of overall copepod abundance. The Bay of Campeche had the highest total zooplankton biovolume (287±120 ml 1000 m−3) and total mean copepod abundance (CC and non-calanoids ~146,000 ind. 1000 m−3) during summer-autumn, likely resulting from cross-shelf nutrient transport fueling local productivity. Adult females dominated calanoid numerical abundance (43-50%), thus suggesting a high reproductive potential. Cluster analysis showed differences between seasons (~40% dissimilarity) but not regions. Environmental conditions explained 22% of the variability in community composition; the winter assemblage was significantly related to oxygen concentrations, whereas the summer-autumn community was related to warmer conditions and higher integrated chlorophyll-a concentrations. The CC community responded to seasonal changes more than regionally related hydrographic differences, with likely implications for organic matter cycling and export.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"255 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139552163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Koki Tokuhiro, Kohei Matsuno, Jonaotaro Onodera, Makoto Sampei, Amane Fujiwara, Naomi Harada, Barbara Niehoff, Eva-Maria Nöthig, Atsushi Yamaguchi
Calanus hyperboreus is one of the dominant copepod species in the Arctic zooplankton communities. The impact of climate change varies among regions within the Arctic, implying that C. hyperboreus populations may be differently affected at different locations, but knowledge on seasonal population dynamics in relation to biogeography is scarce. To fill this gap, we counted C. hyperboreus in samples from sediment traps that were moored from 2009 to 2014 in three regions of the Arctic Ocean (eastern Fram Strait, northern Chukchi Sea and MacKenzie Trough). The C. hyperboreus flux increased between April and May in all regions, likely associated with the ascent from overwintering depth to the surface. In the descent period, high fluxes were observed between July and September in the Fram Strait, between September and November in the northern Chukchi Sea, and between August and October in the MacKenzie Trough, suggesting that the timing of descent varied among the regions characterized by differences in light regime, phytoplankton development and water temperature. The copepodite stage composition in the eastern Fram Strait and the MacKenzie Trough varied with season, suggesting successful local reproduction while it was uniform in the northern Chukchi Sea, possibly because the population is fueled by advection.
{"title":"Sediment trap samples reveal regional differences in the population structure of Calanus hyperboreus from the Arctic Ocean","authors":"Koki Tokuhiro, Kohei Matsuno, Jonaotaro Onodera, Makoto Sampei, Amane Fujiwara, Naomi Harada, Barbara Niehoff, Eva-Maria Nöthig, Atsushi Yamaguchi","doi":"10.1093/plankt/fbad059","DOIUrl":"https://doi.org/10.1093/plankt/fbad059","url":null,"abstract":"Calanus hyperboreus is one of the dominant copepod species in the Arctic zooplankton communities. The impact of climate change varies among regions within the Arctic, implying that C. hyperboreus populations may be differently affected at different locations, but knowledge on seasonal population dynamics in relation to biogeography is scarce. To fill this gap, we counted C. hyperboreus in samples from sediment traps that were moored from 2009 to 2014 in three regions of the Arctic Ocean (eastern Fram Strait, northern Chukchi Sea and MacKenzie Trough). The C. hyperboreus flux increased between April and May in all regions, likely associated with the ascent from overwintering depth to the surface. In the descent period, high fluxes were observed between July and September in the Fram Strait, between September and November in the northern Chukchi Sea, and between August and October in the MacKenzie Trough, suggesting that the timing of descent varied among the regions characterized by differences in light regime, phytoplankton development and water temperature. The copepodite stage composition in the eastern Fram Strait and the MacKenzie Trough varied with season, suggesting successful local reproduction while it was uniform in the northern Chukchi Sea, possibly because the population is fueled by advection.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"110 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139552158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Garam Kim, Wongyu Park, Yeonjung Lee, Hyung-Ku Kang
We estimated the total production of Calanus sinicus over four seasons by measuring somatic and egg production rates in the Yellow Sea. In the process of measuring somatic production, the length–weight relationship and growth rates of C. sinicus in this region were also derived. The population abundance and biomass of C. sinicus were especially high in spring. All copepodite stages had similar proportions in spring, whereas the late stages and adults were most common in summer. The mean total production of the C. sinicus population was 107.6–259.7 μg C m−3 day−1, ranging from higher values in spring to lower values in summer. The annual total production of C. sinicus in the Yellow Sea was 64.3 mg C m−3 year−1 (4032 mg C m−2 year−1). The production of C. sinicus was positively correlated with chlorophyll a concentration, rather than water temperature or salinity. This study is the first to quantify the secondary production of C. sinicus in the Yellow Sea. These findings will broaden our understanding of the ecology of C. sinicus and its contribution to the Yellow Sea food web.
我们通过测量黄海鲣鱼的体产量和卵产量，估算了四季鲣鱼的总产量。在测量体细胞产量的过程中，还得出了该区域钙华鱼的体长-体重关系和生长率。春季桡足类的种群丰度和生物量尤其高。所有桡足类阶段在春季的比例相似，而晚期和成体在夏季最为常见。桡足类种群的平均总产量为 107.6-259.7 μg C m-3 day-1，从春季的较高值到夏季的较低值不等。黄海中的胭脂鱼年总产量为 64.3 毫克 C m-3 年-1（4032 毫克 C m-2 年-1）。胭脂鱼的产量与叶绿素 a 浓度呈正相关，而不是与水温或盐度呈正相关。这项研究首次量化了黄海中胭脂鱼的次生产量。这些发现将拓宽我们对胭脂鱼生态学及其对黄海食物网贡献的认识。
{"title":"Seasonal variation in the population structure and production of the copepod Calanus sinicus in the Yellow Sea","authors":"Garam Kim, Wongyu Park, Yeonjung Lee, Hyung-Ku Kang","doi":"10.1093/plankt/fbad055","DOIUrl":"https://doi.org/10.1093/plankt/fbad055","url":null,"abstract":"We estimated the total production of Calanus sinicus over four seasons by measuring somatic and egg production rates in the Yellow Sea. In the process of measuring somatic production, the length–weight relationship and growth rates of C. sinicus in this region were also derived. The population abundance and biomass of C. sinicus were especially high in spring. All copepodite stages had similar proportions in spring, whereas the late stages and adults were most common in summer. The mean total production of the C. sinicus population was 107.6–259.7 μg C m−3 day−1, ranging from higher values in spring to lower values in summer. The annual total production of C. sinicus in the Yellow Sea was 64.3 mg C m−3 year−1 (4032 mg C m−2 year−1). The production of C. sinicus was positively correlated with chlorophyll a concentration, rather than water temperature or salinity. This study is the first to quantify the secondary production of C. sinicus in the Yellow Sea. These findings will broaden our understanding of the ecology of C. sinicus and its contribution to the Yellow Sea food web.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"101 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139104068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Philippe Le Noac’h, Bruno Cremella, Jihyeon Kim, Sara Soria-Píriz, Paul A del Giorgio, Amina I Pollard, Yannick Huot, Beatrix E Beisner
There has been limited research on the abiotic and biotic factors affecting the prevalence of phago-mixotrophy (prevMixo) among nanophytoplankton across freshwater ecosystems. In recent years, large-scale sampling campaigns like the EPA-National Lakes Assessment and the NSERC LakePulse survey have generated surface water community composition data for hundreds of lakes across North America, covering large environmental gradients. We present results from our analyses of the nanophytoplankton community data from these two surveys, focusing on a taxonomic comparison of the mixoplankton communities across ecoregions and multivariate analyses of the environmental drivers of the prevMixo. We identified potentially phago-mixotrophic taxa in the majority of sites and across all ecozones sampled. Lake trophic state was identified as the main predictor of nanophytoplankton resource-acquisition strategy assemblages, with lower prevalence and diversity of mixoplankton communities in more eutrophic lakes. Lake trophic state also controlled the composition of the mixoplankton community and increased total phosphorus levels were associated with a loss of mixoplankton diversity. This study represents the most comprehensive assessment of the prevMixo in lake nanophytoplankton communities to date spanning hundreds of sites and a dozen ecozones.
{"title":"Nutrient availability is the main driver of nanophytoplankton phago-mixotrophy in North American lake surface waters","authors":"Philippe Le Noac’h, Bruno Cremella, Jihyeon Kim, Sara Soria-Píriz, Paul A del Giorgio, Amina I Pollard, Yannick Huot, Beatrix E Beisner","doi":"10.1093/plankt/fbad054","DOIUrl":"https://doi.org/10.1093/plankt/fbad054","url":null,"abstract":"There has been limited research on the abiotic and biotic factors affecting the prevalence of phago-mixotrophy (prevMixo) among nanophytoplankton across freshwater ecosystems. In recent years, large-scale sampling campaigns like the EPA-National Lakes Assessment and the NSERC LakePulse survey have generated surface water community composition data for hundreds of lakes across North America, covering large environmental gradients. We present results from our analyses of the nanophytoplankton community data from these two surveys, focusing on a taxonomic comparison of the mixoplankton communities across ecoregions and multivariate analyses of the environmental drivers of the prevMixo. We identified potentially phago-mixotrophic taxa in the majority of sites and across all ecozones sampled. Lake trophic state was identified as the main predictor of nanophytoplankton resource-acquisition strategy assemblages, with lower prevalence and diversity of mixoplankton communities in more eutrophic lakes. Lake trophic state also controlled the composition of the mixoplankton community and increased total phosphorus levels were associated with a loss of mixoplankton diversity. This study represents the most comprehensive assessment of the prevMixo in lake nanophytoplankton communities to date spanning hundreds of sites and a dozen ecozones.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"10 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139104175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Florian Lüskow, Alexis A Bahl, Moira Décima, Deborah K Steinberg, Evgeny A Pakhomov
Pelagic tunicates (appendicularians, doliolids, pyrosomes, salps) are cosmopolitan members of open-ocean food webs that serve as a link to the microbial loop and play a disproportional role in vertical carbon flux. Soestia zonaria is an oceanic salp species studied for more than a century, but little information exists on its ecology. Specimens of Soestia collected between 2008 and 2021 during four research expeditions (three to the Chatham Rise, New Zealand, and one to the Northeast Atlantic) using MOCNESS-1 net and large midwater trawl were analyzed for reproductive biology, stoichiometry and vertical distribution. Populations at the Chatham Rise sampled in early winter were more developed than in spring/early summer and dominated by small and medium-sized sexually reproducing blastozooids. Whole Soestia specimens had high organic content (mean ± SD = 32.8 ± 7.5%) and carbon-to-nitrogen values (6.8 ± 0.9) compared with other salp species, indicating a stronger dependency on carbon to meet its nutritional needs. Depth-stratified sampling showed that Soestia is primarily a low-amplitude diel vertical migrator occurring in the top 150 m of the water column, but also found at depths exceeding 500 m. Soestia is primarily an epipelagic salp species adapted to living in warm-temperate nutrient-depleted and more productive ocean regions.
{"title":"Reproductive biology, elemental composition and diel vertical migration of the cosmopolitan warm-temperate pelagic tunicate Soestia zonaria","authors":"Florian Lüskow, Alexis A Bahl, Moira Décima, Deborah K Steinberg, Evgeny A Pakhomov","doi":"10.1093/plankt/fbad053","DOIUrl":"https://doi.org/10.1093/plankt/fbad053","url":null,"abstract":"Pelagic tunicates (appendicularians, doliolids, pyrosomes, salps) are cosmopolitan members of open-ocean food webs that serve as a link to the microbial loop and play a disproportional role in vertical carbon flux. Soestia zonaria is an oceanic salp species studied for more than a century, but little information exists on its ecology. Specimens of Soestia collected between 2008 and 2021 during four research expeditions (three to the Chatham Rise, New Zealand, and one to the Northeast Atlantic) using MOCNESS-1 net and large midwater trawl were analyzed for reproductive biology, stoichiometry and vertical distribution. Populations at the Chatham Rise sampled in early winter were more developed than in spring/early summer and dominated by small and medium-sized sexually reproducing blastozooids. Whole Soestia specimens had high organic content (mean ± SD = 32.8 ± 7.5%) and carbon-to-nitrogen values (6.8 ± 0.9) compared with other salp species, indicating a stronger dependency on carbon to meet its nutritional needs. Depth-stratified sampling showed that Soestia is primarily a low-amplitude diel vertical migrator occurring in the top 150 m of the water column, but also found at depths exceeding 500 m. Soestia is primarily an epipelagic salp species adapted to living in warm-temperate nutrient-depleted and more productive ocean regions.","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"24 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139104131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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