Journal of Marine Systems最新文献

{"title":"Spatio-temporal patterns of sponge strandings in the southern Gulf of Mexico: The role of cold front events","authors":"Enrique Ávila ,&nbsp;Laura Elena Vázquez-Maldonado ,&nbsp;Jorge Luis Alfonso-Ortíz","doi":"10.1016/j.jmarsys.2022.103795","DOIUrl":"10.1016/j.jmarsys.2022.103795","url":null,"abstract":"<div><p><span>Remnants of marine invertebrates are common in the wrack line of the coasts of many regions worldwide. However, little is known about its spatial and temporal variation. This study aimed to investigate the inter-site and intra-annual variability in species composition, abundance, and biomass of sponge strandings on the coast of a southern Gulf of Mexico tropical island. The environmental factors (oceanographic and meteorological) influencing such spatio-temporal variations on abundance and biomass of sponge strandings were also investigated. From a total of 21 demosponge species identified, three species of genus </span><em>Clathria</em><span> (with erect growth forms and a small basal area) were dominant in terms of abundance (93%) and biomass (89%). Both, the monthly average abundance and biomass varied significantly throughout the year, with maximum peaks during the cold fronts season. Only in the case of abundance, a combination of four predictor variables (wind speed, wave height, frequency of southeast winds, and frequency of north winds) explained 84.2% of its intra-annual variability. Results also showed that cold fronts (especially the stronger ones), aside from cyclonic events, can act as disruptive events regulating sponge populations in the coastal zone. Regarding the spatial variability, it was attributed to inter-site differences in the degree of exposure to hydrodynamic forces and the type of substrate. This study contributes to the knowledge of the biodiversity of sponge species in this coastal region of the Gulf of Mexico and demonstrates that large-scale seasonal events such as cold fronts can influence their temporal dynamics.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"235 ","pages":"Article 103795"},"PeriodicalIF":2.8,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46900480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term zooplankton variability in the southern Patagonian shelf, Argentina","authors":"Georgina D. Cepeda ,&nbsp;Andrés J. Jaureguizar ,&nbsp;Harold Fenco ,&nbsp;Raúl Reta ,&nbsp;Marina E. Sabatini","doi":"10.1016/j.jmarsys.2022.103782","DOIUrl":"10.1016/j.jmarsys.2022.103782","url":null,"abstract":"<div><p>Zooplankton can amplify changes resulting from physical forcing associated with climate change at interannual and longer time scales, so multi-year time series data for the pelagic assemblage can provide useful information about climate-ecosystem interactions. Zooplankton biomass and taxonomic composition were analyzed for the region over the southern Patagonian shelf (SPS) for March 1994 to 2012 to describe interannual patterns of variation, determine the spatial consistency and dominant scale of temporal variability, and examine their relation to the regional hydrography. The biomass of selected taxa, including primarily copepods, amphipods, and euphausiids, decreased in 2003 and remained low until 2012. These patterns were associated with a moderate increase in sea surface temperature<span>. Our observations could not establish the causal mechanisms, but the observed biomass decrease might be related to variation in northward current flow over the SPS, which is driven by large-scale climatological forcing and would result in reduced cold-water availability over SPS. Understanding the drivers of interannual variability in zooplankton composition and biomass of this ecosystem is essential for prediction of impacts of climate change on the pelagic ecosystem, including important commercially fished species.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"235 ","pages":"Article 103782"},"PeriodicalIF":2.8,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42360963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Emission load, flux and estuarine modulation of ammonium and phosphate from a small subtropical river basin to the coast","authors":"Théo Dias Arueira ,&nbsp;Björn Kjerfve ,&nbsp;Carolina Cloris Lopes Benassuly ,&nbsp;Paula Sagilião Isacksson ,&nbsp;Anandra Machado ,&nbsp;Francisco de Assis Esteves ,&nbsp;Maurício Mussi Molisani","doi":"10.1016/j.jmarsys.2022.103786","DOIUrl":"10.1016/j.jmarsys.2022.103786","url":null,"abstract":"<div><p>Small river basins represent an important source of dissolved nutrients to the coast, which are fundamental to coastal primary production. However, such transport is a resultant of nutrient fluxes from small rivers, estuarine modulation and, currently, anthropic emission loads. In this context, this study assessed ammonium (NH₄⁺) and phosphate (PO₄³⁻<span><span>) dynamics in a small subtropical river-estuary system by addressing seasonal fluxes from the river to the estuary, as well as the estuarine spring-neap tidal modulation, the resultant fluxes to the coast, and the influence of natural processes and </span>anthropogenic activities on the land-sea nutrient dynamics. The results indicated that NH</span>₄⁺ and PO₄³⁻ fluxes in the small river-estuary system were influenced by anthropic emission loads and by estuarine modulation through amplification of river discharge and NH₄⁺ and PO₄³⁻ concentrations and fluxes within the estuary. During most of the time, the small river-estuary system exported such dissolved nutrients to the coast, likely contributing to coastal primary production.</p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"235 ","pages":"Article 103786"},"PeriodicalIF":2.8,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45553867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interannual variations and their dynamic mechanisms of wintertime temperature inversions in the Gulf of Alaska","authors":"Shaojing Guo ,&nbsp;Chunsheng Jing ,&nbsp;Weibo Wang ,&nbsp;Yun Qiu ,&nbsp;Shanwu Zhang","doi":"10.1016/j.jmarsys.2022.103793","DOIUrl":"10.1016/j.jmarsys.2022.103793","url":null,"abstract":"<div><p><span>Using the Simple Ocean Data Assimilation<span> Version 2.2.4 dataset from 1950 to 2010, we analyzed the interannual variations in wintertime temperature inversions in the Gulf of Alaska (GOA), and the linkages to the Aleutian Low are also examined. The results show that the climatological wintertime temperature inversions is predominantly distributed in the northwestern GOA (NWGOA) and northern GOA (NGOA), in which it is stronger in the NWGOA than in the NGOA. Interannual variations in the temperature difference (∆</span></span><em>T</em>) are pronounced and are mainly controlled by the temperature minimum (<em>T</em>_<em>min</em>) of the inversions layer. The temperature inversions layer became warmer and shallower during 1950–2010, among <em>T</em>_<em>min</em> and the temperature maximum (<em>T</em>_<em>max</em>) was notably warming, and the upper edge depth (<em>D</em>_<em>min</em>) and lower edge depth (<em>D</em>_<em>max</em>) revealed significant shoaling. ∆<em>T</em><span> decreased by 0.12 °C from 1950 to 2010 in the NWGOA but had no trend in the NGOA. The interannual variations in wintertime temperature inversions are controlled by the mixed-layer temperature anomalies and are closely correlated with the changes in the Aleutian Low. The weakened (deepened) Aleutian Low during strong (weak) ∆</span><em>T</em><span> winters could cause the weakening (enhancement) of the cyclone wind field in the North Pacific subarctic region, which is conducive to slowing down (spinning up) the flow of the Alaskan Gyre and the transportation of warm air into the GOA. Thus, a negative (positive) </span><em>T</em>_<em>min</em> anomalies within the mixed layer is larger than <em>T</em>_<em>max</em> anomalies, resulting in a larger (smaller) ∆<em>T</em>; meanwhile, the strong (weak) cooling effect leads to a deeper (shallower) <em>D</em>_<em>max</em><span>. The interannual variations in the wintertime temperature inversions could be influenced by net heat flux and advection anomalies in the NWGOA, but only caused by net heat flux anomalies in the NGOA.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"235 ","pages":"Article 103793"},"PeriodicalIF":2.8,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48157392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution of marine benthic diatoms on the coasts of the sea of Marmara and their responses to environmental variables","authors":"Reyhan Akcaalan,&nbsp;Aydın Kaleli,&nbsp;Latife Köker","doi":"10.1016/j.jmarsys.2022.103780","DOIUrl":"10.1016/j.jmarsys.2022.103780","url":null,"abstract":"<div><p><span>The Sea of Marmara, located in northwest Turkey, comprises challenging environmental conditions and is an important bridge between the Black Sea and the Aegean Sea. In this study, we assessed the trophic situation of the coasts of the Sea of Marmara using the benthic diatom composition and their relation to the environmental variables in the spring and autumn of 2019 and 2020. A total of 120 samples were collected and 452 species were observed; </span><span><em>Navicula</em></span> Bory and <span><em>Nitzschia</em></span><span><span><span> Hassal were represented with the highest numbers of taxa. Analysis of Similarity (ANOSIM) revealed that diatom communities differed significantly between the spring-autumn periods and years. Canonical Correspondence Analysis (CCA) showed that diatoms grouped under water, temperature, salinity, dissolved oxygen, and </span>TIN influence. TRIX observations revealed a highly mesotrophic-eutrophic status along the coasts. Our study contributes to the knowledge of diatom diversity, distribution and community changes in spring and autumn on the coasts Sea of Marmara. Our findings suggest that marine benthic diatoms could be used as </span>eutrophication indicators in the coastal waters for long-term monitoring with the support of environmental parameters.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103780"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49494216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertical distribution of picophytoplankton in the NW shelf and deep-water area of the Black Sea in spring","authors":"Vladimir Mukhanov ,&nbsp;Evgeniy Sakhon ,&nbsp;Natalia Rodionova ,&nbsp;An-Yi Tsai","doi":"10.1016/j.jmarsys.2022.103779","DOIUrl":"10.1016/j.jmarsys.2022.103779","url":null,"abstract":"<div><p><span>Structure and functions of picophytoplankton and their links to the water column density stratification and nutrient vertical profiles were studied in the Black Sea open waters along a transect from the Western Gyre to the NW shelf during spring homothermy in April of 2017. Abundances of picocyanobacteria of the genus </span><span><em>Synechococcus</em></span> (0.85 ± 0.96 (SD) × 10³ cells ml⁻¹) and eukaryotic picoalgae (5.74 ± 5.99 × 10³ cells ml⁻¹) and their intracellular pigment (chl <em>a</em>, phycoerythrin) contents were quantified using flow cytometry. The distribution of these variables in the upper 100-m layer was non-uniform. Along the whole transect, <em>Synechococcus</em><span> and picoeukaryote abundance maxima (up to 4 × 10</span>³ and 3 × 10⁴ cells ml⁻¹, respectively) were observed at the water temperature of 8–8.5°С in the depth range between 30 and 40 m. Picoeukaryotes dominated the total community. The share of <em>Synecococcus</em> averaged about 22% and increased with depth up to 80%. Picophytoplankton abundance dropped abruptly through the oxycline but the cells were found in the suboxic layer at about 10³ cells ml⁻¹ and in a sample from the anoxic zone at 10² cells ml⁻¹. Intracellular chl <em>a</em> maxima were revealed in the nitrate peak at sigma-<em>t</em><span><span> density of 15.5. In the surface and suboxic layers, non-specific green autofluorescence (GAF) was detected in picophytoplankton cells that might provide evidence of their stress state in adverse environment. Multivariate analysis has revealed tight coupling between abiotic and microbiological variables in three statistically distinct pelagic regions of the transect, corresponding to the abyss, the </span>continental slope and the shelf.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103779"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48416936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anticyclonic mesoscale eddy induces mesopelagic biomass hotspot in the oligotrophic ocean","authors":"Yuan Wang, Jinhui Zhang, Jiancheng Yu, Qiaoyan Wu, Dong-sheng Sun","doi":"10.1016/j.jmarsys.2022.103831","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2022.103831","url":null,"abstract":"","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45135166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial metabolic activity in two basins of the Gulf of Mexico influenced by mesoscale structures","authors":"Josué Villegas-Mendoza ,&nbsp;Eliana Gómez-Ocampo ,&nbsp;Jorge Velásquez-Aristizábal ,&nbsp;Diana Rodríguez-Escobar","doi":"10.1016/j.jmarsys.2022.103781","DOIUrl":"10.1016/j.jmarsys.2022.103781","url":null,"abstract":"<div><p>Information on microbial metabolic activity is essential for quantifying carbon and energy flows through marine food webs. We quantified community (R_com) and prokaryotic (R_pro<span><span>) respiration rates, bacterial production (BP), bacterial abundance (BA), and bacterial growth efficiencies (BGE) in the Perdido and Coatzacoalcos basins of the Gulf of Mexico (GOM) during summer and winter conditions in 2016. Our results showed seasonal, regional, and </span>mesoscale eddy influences on those metabolic variables. R</span>_pro accounted for &gt;60% of total respiration in both regions, being three times higher in stations influenced by a cyclonic eddy (CE) in September (24.1 μM O₂ d⁻¹) than in stations affected by an anticyclonic eddy in March (7.2 μM O₂ d⁻¹) within the Coatzacoalcos basin where the eddy-trapping mechanism advected biomass-enriched waters from the Bay of Campeche. The eddy-stirring mechanism produced horizontal and vertical dipole patterns of metabolic variables increasing up to one order of magnitude R_com and R_pro<span> while decreasing BGE to 25-fold from the southeastern to the northwestern edges in CEs. This finding indicates that dissolved organic matter is more actively taken up to build bacterial biomass on the eastern edge of CEs in the GOM, while R</span>_pro and R_com increase on the western edges. Satellite integrated primary production was coupled with surface R_pro and R_com at CEs and no eddies. BP was mainly regulated by CEs and was about 50% higher in the Coatzacoalcos basin (~0.03–0.14 μmol C L⁻¹ d⁻¹). BP increased in zones with high R_pro and R_com, suggesting that R_com<span><span><span> is associated with heterotrophic prokaryote activity in both basins. BGE was lower than 25% within the upper 500 m during both cruises, but the highest values were quantified in the </span>euphotic zone<span> and during the September cruise. Metabolic variables integrated over the water column showed that 40–80% of the microbial activity occurred between the base of the euphotic zone and 150 m depth. Our findings contribute to a better understanding of the metabolic activity of the </span></span>microbial communities in two regions of the GOM influenced by mesoscale eddies.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103781"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41422549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal influence of intrusion from the Kuroshio Current on microplankton biomass and community structure in the northern Satsunan area, western Japan","authors":"Mutsuo Ichinomiya ,&nbsp;Takehito Nomiya ,&nbsp;Tomohiro Komorita ,&nbsp;Toru Kobari ,&nbsp;Gen Kume ,&nbsp;Akimasa Habano ,&nbsp;Yoichi Arita ,&nbsp;Fumihiro Makino","doi":"10.1016/j.jmarsys.2022.103767","DOIUrl":"10.1016/j.jmarsys.2022.103767","url":null,"abstract":"<div><p><span>Seasonal variations in hydrographic conditions, nutrients, and microplankton abundance and biomass were investigated inside and outside Kagoshima Bay in the northern Satsunan area. The area is a nursery ground for the migrating fish. During the mixing season from November to April, highly saline water (&gt;34.5) originating from a branch of the Kuroshio Current, the western boundary current of the North Pacific Subtropical Gyre, intruded from the surface layer into the bay causing extrusion of coastal bottom water. This intrusion generated vertical mixing between surface water and nutrient-rich bottom water. Consequently, chlorophyll </span><em>a</em> concentrations increased (&gt;1 μg l⁻¹) around the bay mouth. During the stratified season from May to August, the coastal surface water was extruded due to intrusion of saline water from the bottom layer. High chlorophyll <em>a</em> concentrations (&gt;1 μg l⁻¹<span><span>) were also observed in the surface layer in July during the rainy season. Such differences in hydrographic conditions between mixing and stratified seasons were due to vertical distribution of highly saline water from outside the bay, which seasonally migrated between surface and subsurface layers. Relatively distinct redundancy analysis plots and boxplots generated from a generalized linear model showed that microplankton community structure differed between mixing and stratified seasons. The mixing and stratified seasons were characterized by high diatom abundance and low microplankton abundance, respectively, suggesting that vertical mixing increases nutrient supply and consequently increases diatom abundance. Thus, microzooplankton (mainly naked ciliates and athecate dinoflagellates) abundance was related to the abundance of prey organisms, such as diatoms, thecate dinoflagellates and cryptophyte-like flagellates, rather than hydrographic conditions. Thus, saline water intrusion from a branch of the Kuroshio Current likely governs hydrographic conditions in Kagoshima Bay and consequently affects temporal variations in abundance and taxonomic composition of </span>phytoplankton and microzooplankton communities.</span></p></div>","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":"234 ","pages":"Article 103767"},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49086577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chlorophyll-a concentration climatology, phenology and trend in the optically complex waters of the St. Lawrence Estuary and Gulf","authors":"J. J. Laliberte, P. Larouche","doi":"10.1016/j.jmarsys.2022.103830","DOIUrl":"https://doi.org/10.1016/j.jmarsys.2022.103830","url":null,"abstract":"","PeriodicalId":50150,"journal":{"name":"Journal of Marine Systems","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47813050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}