Journal of Sea Research最新文献

{"title":"Sustainable synergistic development of marine economic degree growth and marine art industry","authors":"Zhiping Lian","doi":"10.1016/j.seares.2024.102474","DOIUrl":"10.1016/j.seares.2024.102474","url":null,"abstract":"<div><p>Marine and port economy estimation is conducive to the understanding of the development law of marine economy degree. This study proposes a neural-learning network estimation model of the marine economy degree based on a priori architectural knowledge and adopts time-combined class array columns and multivariate modeling methods to estimate the indicators reflecting the development level of the marine economy degree in the ZJP region. The study adopts the PK_NN multivariate modeling method, taking cargo transportation volume, cargo turnover, cargo carrying value of ports near the sea, foreign trade throughput, port container throughput, and port container throughput as multivariate model inputs, and compared with the other modeling methods, the model of the time combination class array columns of type GM_11, which has a better comprehensive performance. Finally, the PK_NN time-combined class array column model is used to estimate the development level of the marine economy in the ZJP region near the seaport from 2011 to 2020, and the results show that the estimated value of the marine economy in the ZJP region is close to the actual planning value of the ZJP region. The algorithm was applied to estimate the economic degree curves of the five near-seaport areas of ABCDE under different harbor head construction art modes, and the results showed that the relative value error of the estimation was controlled between 4% and 10%, and the fluctuation ranges of each month's specific growth value area estimation were comparable. This proves the effectiveness and accuracy of the a priori marine neural-learning-based network algorithm in this paper.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"198 ","pages":"Article 102474"},"PeriodicalIF":2.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110124000078/pdfft?md5=20999a9c246ce62f02b1e462e0f35100&pid=1-s2.0-S1385110124000078-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139537276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal tolerance of intertidal gastropods in the Western Arabian Gulf","authors":"Sinatrya D. Prayudi,&nbsp;Asmaa Korin,&nbsp;Michael A. Kaminski","doi":"10.1016/j.seares.2024.102470","DOIUrl":"https://doi.org/10.1016/j.seares.2024.102470","url":null,"abstract":"<div><p>Laboratory experiments were conducted to determine the thermal tolerance of the living shallow-water and intertidal gastropods from lagoons in Bahrain and Saudi Arabia, in the western Arabian Gulf. Our experimental trials, run in duplicate using a semi-controlled thermal incubator, quantify the thermal limits of two species of gastropods, the tropical periwinkle <em>Planaxis sulcatus</em> (Born, 1778) and the mud creeper <em>Pirenella conica</em> (Blainville, 1829), which are commonly found in the region. The two species display different thermal tolerances to heat exposure during this study. In the case of <em>Planaxis sulcatus,</em> we observe that half of the test specimens that are fully exposed to the air enter an inactive state or become comatose at about 39 °C, while half of specimens that are fully immersed in sea water become immobile around 42 °C. For <em>Pirenella conica</em> half of test specimens that are fully exposed enter become inactive at about 37.5 °C, while for specimens that are fully immersed in sea water this temperature is around 45 °C. At 60 °C total mortality is observed with no indication of recovery. These observations have implications for climate change predictions in the western Gulf region, as water temperatures in the lagoon already reach 42 °C in summer, while the substrate temperatures on mud flats exposed during low tide exceed the lethal limit of the gastropods during the summer months.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"197 ","pages":"Article 102470"},"PeriodicalIF":2.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110124000030/pdfft?md5=9239868ebc54b968d39562fbdb7975d2&pid=1-s2.0-S1385110124000030-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139480090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unraveling the role of bacterial communities in mangrove habitats under the urban influence, using a next-generation sequencing approach","authors":"Mayukhmita Ghose ,&nbsp;Ashutosh Shankar Parab ,&nbsp;Cathrine Sumathi Manohar,&nbsp;Deepika Mohanan,&nbsp;Ashwini Toraskar","doi":"10.1016/j.seares.2024.102469","DOIUrl":"10.1016/j.seares.2024.102469","url":null,"abstract":"<div><p>Mangrove ecosystems are vital coastal habitats with rich biodiversity and play a significant role in carbon sequestration, these habitats are facing mounting threats from rapid urbanization. This study delves into assessing the sediment bacterial communities from the urban mangrove habitats of Campal and Panaji, within the Mandovi estuarine environment of Goa, to understand the intricate interplay between urbanization and bacterial dynamics in the mangrove habitats. We used a combined approach of 16S amplicon and shotgun sequencing methodologies to understand the bacterial taxonomic composition and functional profiles. The community structure revealed the dominance of bacterial groups from phylum Proteobacteria, Chloroflexi and Actinobacteria at both locations. The impact of urbanization was evident from the increased abundance of pathogenic groups at class and genus levels in this region. The core microbiome analysis showed the presence of <em>Shewanella</em>, <em>Pseudomonas</em> and <em>Clostridium</em> which are mostly pathogenic, anaerobic taxa <em>Woeseia</em>, <em>Rheinheimera</em>, like genera that are involved in the organic matter cycling and unclassified bacteria. Though increased pathogenic forms are reported, it is evident that the dominant taxa also included groups that contributed to the biogeochemical cycling of organic matter in sediment from these locations. Functional diversity elucidated through shotgun metagenomics analysis showcased the predominance of carbohydrate metabolism and the presence of glycoside hydrolases degrading plant-based starch, pectin and cellulosic organic matter. The occurrence of xenobiotic biodegradation pathways is an indication of the presence of xenobiotic degrading microbes as a natural means of degrading high amounts of pollutants at this location. Comparative analysis of the metagenomes from this study with similar earlier studies at Ribandar, Mandovi and Cortalim, Zuari mangrove habitats of Goa with varying pollution levels also reiterates the terrestrial influence on the microbial community in these habitats. It showed that Panaji and Campal locations had the presence of dominant pathogenic forms which was absent in the other two locations. The Ribandar and Coratlim location which is reported to have a comparatively lesser impact due to anthropogenic activity had an increased abundance of distinct genera which are predominant heterotrophic forms involved in remineralization and reduced levels of pathogens. Our findings highlight the profound influence of urbanization on the sediment mangrove bacterial communities and spotlight the resilience and adaptability of these microorganisms. This calls for immediate action and preventive measures to restore their functional potential in maintaining the health of these ecosystems amidst expanding urban landscapes.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"198 ","pages":"Article 102469"},"PeriodicalIF":2.0,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110124000029/pdfft?md5=ba31974fd7c75934ef393fa42ae78a39&pid=1-s2.0-S1385110124000029-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139422742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The coordination of technological and financial innovation concepts on the marine economy and its ecological development","authors":"Yan Sun ,&nbsp;Dongjing Chen ,&nbsp;Zhaohui Geng","doi":"10.1016/j.seares.2024.102468","DOIUrl":"10.1016/j.seares.2024.102468","url":null,"abstract":"<div><p>This study first constructs an evaluation index system based on the pressure state response model, and assigns weights through entropy method and coefficient of variation method, providing theoretical and methodological support for comprehensive measurement and evaluation. Second, the least squares decision model is introduced and the PVAR model is used to analyze the development level of China's marine economy, ecology, and technological and financial innovation. The results indicated that from 2012 to 2022, the marine economic development level, marine ecological development level, and marine technology and financial innovation development level of 9 coastal provinces in China all showed a certain growth trend. However, in terms of the level of marine ecological development, various provinces had shown a downward trend, with Hebei performing the best, with an average of 0.230. Although various regions have achieved significant development in marine economy, ecology, and technological and financial innovation, the level of development varies among regions, and some regions have relatively low levels of technological innovation. The pressure and challenges between the marine economy and ecological environment protection caused by these real environments remain significant.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"197 ","pages":"Article 102468"},"PeriodicalIF":2.0,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110124000017/pdf?md5=e42d23b4c16c07db506b0ac17ab4210e&pid=1-s2.0-S1385110124000017-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139395368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of starvation on physiological and survival traits of Mimachlamys varia (Linneaus, 1758)","authors":"Laure Régnier-Brisson ,&nbsp;Aline Blanchet-Aurigny ,&nbsp;Philippe Cugier ,&nbsp;Florian Breton ,&nbsp;Jean-Dominique Gaffet ,&nbsp;Fred Jean ,&nbsp;Jonathan Flye-Sainte-Marie","doi":"10.1016/j.seares.2023.102467","DOIUrl":"10.1016/j.seares.2023.102467","url":null,"abstract":"<div><p>In order to better understand <em>Mimachlamys varia</em> (Linneaus, 1758) response to nutritional stress, a controlled-condition experiment was conducted. Two scallop batches (<em>i.e.</em> juveniles and adults) were completely food-deprived for 3 months. Changes in mass and energy content of tissues (adductor muscle, digestive gland, rest of the soft tissues), as well as stable carbon and nitrogen isotope ratios of the adductor muscle were monitored weekly. Both batches exhibited a 3-phase response to starvation. For adults, phase 1, was characterized by a fast loss in mass, an δ¹⁵N-enrichment, a stable calorific power, and a low mortality, corresponding to a transitional stage associated with protein-storage consumption. Phase 2 (day 28–42) exhibited a stabilization of mass and δ¹⁵N values, coinciding with a digestive gland calorific power drop and an acceleration in mortality. This corresponds to a “protein sparing” stage where highly energetic fuel such as lipids, which are stored especially in the digestive gland in pectinids, are consumed in priority. Juveniles exhibited a distinct response characterized by a significant mass loss and an increase in calorific power during the first phase (day 0–28). This body weight decrease may involve the remobilization of low-caloric biochemical compounds (<em>e.g.</em> proteins) using the structure as internal fuel, thus limiting somatic maintenance costs. During the second month, body mass and calorific power stabilized, indicating a “protein sparing” stage. In a third phase for both age classes, mass decreased again together with a sharp increase in mortality: essential structure was ultimately remobilized. The survival rate of juveniles was higher than that of adults during the first two months of the experiment (97% and 64%, respectively). Although the time required for starvation to deplete of half the cohort is higher for juveniles than for mature individuals, increase in mortality rate after reaching the “Point of No Return”, (<em>e.g.</em> the beginning of the last phase) was higher in juveniles than in adults. These results highlight the potential impacts of starvation at the population level, beyond the direct impact on individual survival. For instance, individuals may not effectively contribute to reproduction during the spawning period if exposed to a prolonged winter starvation episode. In particular, since highly energetic compounds stored in the digestive gland are often used as fuel to initiate gametogenesis in pectinids. Similarly, decrease in somatic weight in juveniles may delay their sexual maturity and hence their ability to contribute to population reproductive potential.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"198 ","pages":"Article 102467"},"PeriodicalIF":2.0,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110123001363/pdfft?md5=affefb2c8be64bc2b3cd5937eb842c32&pid=1-s2.0-S1385110123001363-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139095989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of UV reactor controller in ballast water treatment system to minimize the biological threat on marine environment","authors":"Nguyen Dinh Thach,&nbsp;Phan Van Hung","doi":"10.1016/j.seares.2023.102465","DOIUrl":"10.1016/j.seares.2023.102465","url":null,"abstract":"<div><p>Ballast water management is an effective measure to ensure that organisms and bacteria do not migrate with the ballast water to other areas. The International Maritime Organization adopted the International Convention on the Control and Management of Ballast Water and Ship Sediments, in 2004 which regulates issues of ballast water management. Many technologies have been researched and developed; in particular, using UV rays is the method that is evaluated with many advantages and meets the requirements of the Convention. The UV reactor in the ballast water treatment system has a very large capacity, so in the ballast water treatment system, it is often necessary to use many high-power UV lamps in one UV reactor. These high-power UV lamps consume a lot of electrical energy and are very expensive. Research on the control of UV radiation in the process of disinfecting water appropriately and effectively is necessary in order to improve the life of UV lamps, consume less electricity, and ensuring anti-bacterial duty is well conducted. This paper presents the development of a controller for a UV reactor and ballast water flow in the ballast water treatment system installed on ships. Experimental results on ships indicate the efficiency achieved by the developed UV controller.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"198 ","pages":"Article 102465"},"PeriodicalIF":2.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S138511012300134X/pdfft?md5=0baf4999ee1e5edee45fc58f8ba93660&pid=1-s2.0-S138511012300134X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138820900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial variation and mechanism of the dissolved/particulate organic carbon partitioning of seawater adjacent to the mangrove in Zhangjiang Estuary","authors":"Ran Yan ,&nbsp;Jianxiang Feng ,&nbsp;Huamei Huang ,&nbsp;Jinhui Yan ,&nbsp;Zhaoyong Zheng ,&nbsp;Guanmin Huang ,&nbsp;Qingshu Yang","doi":"10.1016/j.seares.2023.102466","DOIUrl":"10.1016/j.seares.2023.102466","url":null,"abstract":"<div><p>Mangrove is one of the most carbon-rich ecosystems in the world. Nevertheless, the understanding of organic carbon partitioning between dissolution and particle in the processes of mangrove outwelling is rather limited, flood–ebb samplings were conducted in January 2021 with 8 sampling sites covering the upper tidal boundary to the mouth in the Zhangjiang Estuary. Water samples were collected to analyze physicochemical properties, dissolved organic carbon (DOC) and particulate organic carbon (POC) contents, and their phase portioning were investigated to analyze the spatial variation between the two phases (dissolve and particle), and their influencing factors. The results showed: (1) DOC was the dominant content with the wide range of 0.48–3.29 mg·L⁻¹, accounting for 77.6% on average; while POC contents were 0.17–1.86 mg·L⁻¹, accounting for 22.4% on average. (2) Silt was dominant component in estuarine suspended sediment, accounting for 68.0% on average; clay accounted for 17.5% of the suspend sediment, and was mainly located in mangrove forest area; sand proportion was the lowest. (3) Both the closed Beijiang sluice and ponds effluents could significantly increase the water organic carbon content, but only ponds effluents changed the phase distribution of organic carbon. In natural processes, a significant positive correlation between particulate and dissolved organic carbon and dissolved oxygen (DO) in the upper estuary (<em>r</em> &gt; 0.9), and a significant negative correlation between particulate and dissolved organic carbon and salinity in the lower estuary (<em>r</em> &lt; −0.7) were observed. The study indicated that DOC was the dominant content, the phase partition coefficients were significantly increased due to the DOC content from pond effluents. In the natural processes, the autotrophic activities by microalgae in the upper estuary and the seawater mixed dilution followed with heterotrophic activities are the important influencing factors.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"197 ","pages":"Article 102466"},"PeriodicalIF":2.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110123001351/pdfft?md5=1ccd85c9b779cfd8cc3f589e09b98b07&pid=1-s2.0-S1385110123001351-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138742764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Edible Sea urchin (Paracentrotus lividus) larval dispersal and connectivity modelling in the northwestern Mediterranean Sea","authors":"C. Barrier ,&nbsp;S. Ternengo ,&nbsp;O. El Idrissi ,&nbsp;L. Piacentini ,&nbsp;N. Barrier ,&nbsp;C. Lett ,&nbsp;V. Pasqualini ,&nbsp;E.D.H. Durieux","doi":"10.1016/j.seares.2023.102464","DOIUrl":"10.1016/j.seares.2023.102464","url":null,"abstract":"<div><p>The edible sea urchin (<em>Paracentrotus lividus</em>) is of significant economic importance due to high demand for its consumption in various Mediterranean countries. This echinoderm plays a crucial ecological role by regulating the dynamics of seaweed and seagrass through its grazing behaviour. The abundance of sea urchin is variable in time and space, but it is currently potentially declining in the Mediterranean Sea, and likely to be negatively affected by global change. Therefore, gaining a more comprehensive understanding of sea urchin larval dispersal patterns over an extended period could contribute to our understanding of how their dynamics relate to population connectivity. To investigate the trajectories of larval dispersal of this sea urchin in the Northwestern Mediterranean Sea, we combined a Lagrangian model (Ichthyop) with a hydrodynamic model (MARS3D). This study covered the years 2010–2018 and aimed to quantify the connectivity between the preferred habitats of the sea urchin (seagrasses and rocky substrates). The present study explores seasonal variations in dispersal routes and habitat connectivity relationships for two spawning scenarios identified in the literature (spring and autumn). The results enable us to identify dispersal routes, and their regularity over time. They highlight a consistent connection between Sardinia, Corsica, and the coastlines of the Ligurian and Tyrrhenian Seas, indicating a lack of genetic structuring within the edible sea urchin population in this area, particularly in Corsica. The connectivity matrices confirm the observed dispersal trajectories and highlight certain areas of significant and enduring local retention over time. The results also reveal minimal seasonal variability. Conversely, interannual variability appears pronounced, particularly in relation with trends in the warming of surface waters in the Mediterranean, which seem to impact the dispersal routes taken by <em>P. lividus</em> larvae. Lastly, a connectivity map was created to explore spatial resource management perspectives, aiming to identify frequent connections over an extended time period and assign varying levels of intensity to them. This approach can provide guidance with regard to resource management issues for different coastal areas that can be connected by larvae.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"197 ","pages":"Article 102464"},"PeriodicalIF":2.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110123001338/pdfft?md5=3589237a961defbcc56763984e4d06d4&pid=1-s2.0-S1385110123001338-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138692338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship between economic growth and marine ecological environment based on VAR models","authors":"Chenhui Li","doi":"10.1016/j.seares.2023.102462","DOIUrl":"10.1016/j.seares.2023.102462","url":null,"abstract":"<div><p>This study aims to investigate the inherent correlation between economic growth and marine conservation in the coastal regions of China, specifically the shifting relationship between high and low economic growth periods and marine pollution. A nonlinear model is employed to determine the dynamic relationship based on historical data, with the inclusion of a nonlinear zone system transfer factor to achieve this dynamic relationship. The study's data was sourced from a statistical database of 11 Chinese coastal provinces, containing details on economic growth rates and emissions of industrial waste. In the study, significant differences in the mean, variance and smoothing probability of the different provinces were observed in the different systems. Notably, Shandong recorded the highest mean μ2 in both systems, 0.7261* and 0.7261**, while the correlation coefficient between the two systems in the high growth area was −0.3543. Significant differences exist in the intrinsic links between economic growth and marine environmental protection within provinces and cities. Therefore, targeted strategies must be developed for specific regions when formulating economic and environmental policies.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"197 ","pages":"Article 102462"},"PeriodicalIF":2.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110123001314/pdfft?md5=7783de000bfdafd487882d752c46de20&pid=1-s2.0-S1385110123001314-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138692030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving prediction for potential spawning areas from a two-step perspective: A comparison of multi-model approaches for sparse egg distribution","authors":"Zunlei Liu ,&nbsp;Yan Jin ,&nbsp;Linlin Yang ,&nbsp;Xingwei Yuan ,&nbsp;Liping Yan ,&nbsp;Yi Zhang ,&nbsp;Hui Zhang ,&nbsp;Min Xu ,&nbsp;Xiaojing Song ,&nbsp;Jianhua Tang ,&nbsp;Yongdong Zhou ,&nbsp;Fen Hu ,&nbsp;Jiahua Cheng","doi":"10.1016/j.seares.2023.102460","DOIUrl":"10.1016/j.seares.2023.102460","url":null,"abstract":"<div><p>Recently, much work has been put into improving species distribution models, especially for systematic conservation planning for important ecosystems. Understanding fish spawning sites requires a thorough examination of ichthyoplankton. These examinations usually produce sparse counts contaminated by inaccurate detection, making it impossible to directly infer the abundance or occurrence from observational data, which could lead to inaccurate model predictions. A flexible modeling framework for estimating and inference about the abundance of eggs with ensemble models that include the presence/absence and abundance components is described in this study. The generalized linear model, generalized additive model, integrated nested Laplace approximations, and random forest habitat modeling approaches were compared within this framework to those currently being used for fish conservation planning at regional scales. Additionally, the distribution of suitable habitats for small yellow croaker (<em>Larimichthys polyactis</em>) spawning stocks were mapped based on the ensemble model. Furthermore, the promotion ability of ensemble models with different weighting methods was evaluated. The outcomes demonstrated that machine learning algorithms performed better than statistical models, and the geometric weighted ensemble model further increased prediction accuracy. However, there was no significant difference compared to the optimal individual model (<em>p</em> &gt; 0.05). The predicted distributions of the four models can be divided into two groups. The central sea of Jiangsu was recognized as the most suitable area by the GAM with a fixed effect for each year and INLA models, while the GLM was similar to the RF with spatial effect (RF-LL) and demonstrated Haizhou Bay as the most suitable area. The ensemble model discovered several areas of highly suitable habitat that dominated areas in the two groups of models and revealed many finer-scale patterns in the egg distribution. According to the ensemble model, although 5.37% of the area could be suitable habitat, only 0.12% was highly suitable. It is suggested that examining small yellow croaker spawning aggregation areas would benefit from using an ensemble modeling approach to identify and prioritize conservation areas.</p></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"197 ","pages":"Article 102460"},"PeriodicalIF":2.0,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1385110123001296/pdfft?md5=591658e7fc800afc054c2e6fa922513c&pid=1-s2.0-S1385110123001296-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138527610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}