Regional Studies in Marine Science最新文献

{"title":"Determination of body length regression formulas for the golden grey mullet (Chelon auratus, Risso 1810) based on otoliths found in the feces of the Caspian Seal (Pusa caspica Gmelin, 1788)","authors":"Mirgaliy Baimukanov,&nbsp;Anuar Shagilbayev,&nbsp;Akzhan Iskakov","doi":"10.1016/j.rsma.2024.103888","DOIUrl":"10.1016/j.rsma.2024.103888","url":null,"abstract":"<div><div>The Caspian Seal (<em>Pusa caspica</em>), the sole marine mammal endemic to the Caspian Sea, is listed in the IUCN Red List as a species facing the threat of extinction, a status similarly recognized and/or assigned in all countries in the Caspian region. The study of seal nutrition using caprological methods is of great interest for understanding animal adaptation to deteriorating habitat conditions and assessing the adequacy of their food base in the sea. This method involves analyzing the contents of feces from ichthyophages to detect undigested fish otoliths. The results of studying the seal's diet during periods of haulout on breeding grounds showed that the frequency of occurrence of <em>Chelon auratus</em> otoliths ranged from 2 % to 3–27.7 % of all fish otoliths detected in feces. This study aims to assess changes in <em>Chelon auratus</em> otoliths as they pass through seals' gastrointestinal tracts and estimate formulas for recovering the linear dimensions of fish consumed by these seals. The research indicates that otolith growth slows with fish growth but does not cease entirely. Allometry is evident in the different ratios of otolith length and width to fish length in various size groups and the change in otolith shape as fish grow. To recover the body length of fish consumed by seals based on otoliths found in their feces, applying inverse calculation formulas obtained when studying the relationship between otolith growth and fish body growth using collection material obtained directly from fish is possible. Further research should focus on refining the recovery formula for the length of large fish by dividing the length into several segments, each described by separate formulas describing the relationship between fish body length and otolith length and width growth.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103888"},"PeriodicalIF":2.1,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Long-term trends in abundance and potential drivers for eight species of coastal birds in the U.S. South Atlantic","authors":"J.K. Craig ,&nbsp;K.I. Siegfried ,&nbsp;R.T. Cheshire ,&nbsp;M. Karnauskas ,&nbsp;P.G.R. Jodice","doi":"10.1016/j.rsma.2024.103886","DOIUrl":"10.1016/j.rsma.2024.103886","url":null,"abstract":"<div><div>The U.S. South Atlantic coastal region is used by many marine birds for foraging, reproduction, and migration. We developed standardized indices of relative abundance from long–term (1980–2016), semi-structured monitoring data (eBird) for eight species: Brown Pelican (<em>Pelecanus occidentalis</em>), Double-Crested Cormorant (<em>Nannopterum auritum</em>), White Ibis (<em>Eudocimus albus</em>), Wood Stork (<em>Mycteria americana</em>), Piping Plover (<em>Charadrius melodus</em>), American Oystercatcher (<em>Haematopus palliatus</em>), Clapper Rail (<em>Rallus crepitans</em>), and Northern Gannet (<em>Morus bassanus</em>). Following a period of stable or declining abundance from the 1980s through the 1990s, most species have shown stable or slightly upward trends through the late 2000s; Brown Pelican and Piping Plover have shown some evidence of recent declines. Species–specific correlations between abundance indices developed from presence/absence data and those developed from count data were positive for all species and ranged from 0.53 to 0.86. Dynamic factor analysis identified common trends in abundance among several species, in particular, Brown Pelican, Double–Crested Cormorant, and White Ibis. Model performance was improved with inclusion of an indicator of sea level rise, but not forage fish abundance or temperature, indicating habitat availability mediated by changing water levels may explain some of the underlying abundance trends. Our results provide baseline information on long–term trends for several important coastal birds that can help inform research, monitoring and conservation efforts in the U.S. South Atlantic region.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103886"},"PeriodicalIF":2.1,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Evolution mechanism and improvement path of marine economy resilience in Bohai Rim Region","authors":"Jinghui Wu ,&nbsp;Bo Li ,&nbsp;Lixiao Zhang ,&nbsp;Yi Qu","doi":"10.1016/j.rsma.2024.103873","DOIUrl":"10.1016/j.rsma.2024.103873","url":null,"abstract":"<div><div>The marine economy resilience is one of the key attributes to measure the sustainable development of marine economy system. In this paper, the core and controlling influencing factors are systematically screened out. The cross-scale evolution mechanism of marine economy resilience of overall and inter-provincial in the Bohai Rim Region is explored by using the spatial econometric model based on the spatial effect level. Meanwhile, the feasible improvement path is proposed for each region considering the quantification utility levels of the influencing factors in each region. The results are as follows: (1) Marine industrial structure <em>Ind</em> and ocean-related employment <em>Emp</em> significantly enhance the marine economy resilience in the Bohai Rim Region, while financial development scale <em>Fin</em> significantly inhibits it; (2) The positive development trend of Liaoning’s marine economy resilience is mainly due to the promoting role of financial development scale <em>Fin</em>, marine industrial structure <em>Ind</em> and marine economy scale <em>Sca</em>; (3) The development of marine economy resilience in Tianjin-Hebei mainly depends on marine economy scale <em>Sca</em> and marine infrastructure <em>Cap</em>; (4) Financial development scale <em>Fin</em>, marine industrial structure <em>Ind</em>, marine economy scale <em>Sca</em> and marine infrastructure <em>Cap</em> have jointly promoted the rapid development of Shandong’s marine economy resilience. Therefore, the improvement path of the overall and inter-provincial marine economy resilience in the Bohai Rim Region is determined and proposed, which effectively promote the sustainable and stable development of its marine economy.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103873"},"PeriodicalIF":2.1,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"What is going on down south? A mini review of plastic pollution on marine megafauna in the Humboldt Current System","authors":"Félix Ayala ,&nbsp;Cristel Cordero-Maldonado ,&nbsp;Juan Tume-Ruiz ,&nbsp;Manuel Domingo Querevalú Tume ,&nbsp;Martín Zeta-Flores ,&nbsp;Edgardo Quinde ,&nbsp;Antia Rangel-Vega ,&nbsp;Gabriel Enrique De-la-Torre ,&nbsp;Diego Joaquín Perez-Venegas ,&nbsp;Susana Cárdenas-Alayza","doi":"10.1016/j.rsma.2024.103885","DOIUrl":"10.1016/j.rsma.2024.103885","url":null,"abstract":"<div><div>A literature review was conducted on plastic debris in megafauna of the Humboldt Current System, one of the most productive marine systems in the world that encompasses the marine-coastal zones of Peru and Chile. The information was obtained from Scopus and Google Scholar and included the analysis of macro, meso and microplastics that have been ingested or have caused entanglement in mammals, birds, turtles and fish. We found 32 publications in this regard, and plastic debris was detected in six species of mammals, 22 birds, two turtles, and two fish. Among them, five species that had interacted with plastic waste were identified as threatened by the International Union for Conservation of Nature (IUCN). Given the scarcity of research on plastic waste and megafauna in the southern hemisphere, it is essential to promote collaboration between specialized centers and to have the support of the public and private sectors to carry out adequate monitoring of the impact of plastic waste in the Humboldt Current System.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103885"},"PeriodicalIF":2.1,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"A 45-year updating wind and wave hindcast over the Oman Sea and the Arabian Sea","authors":"Morteza Jedari Attari ,&nbsp;Aref Farhangmehr ,&nbsp;Arash Bakhtiari ,&nbsp;Edris Delkhosh ,&nbsp;Fatemeh Ameri ,&nbsp;Ebrahim Hamidian Jahromi ,&nbsp;Sarmad Ghader ,&nbsp;S. Abbas Haghshenas","doi":"10.1016/j.rsma.2024.103882","DOIUrl":"10.1016/j.rsma.2024.103882","url":null,"abstract":"<div><div>This study focuses on developing a comprehensive and reliable wind and wave hindcast for the Oman Sea and Arabian Sea, spanning a significant 45-year period (1979–2024). The objective is to capture the intricate wind and wave climate of the region, characterized by distinct monsoon cycles and occasional tropical cyclones. The availability of extensive wave data over four decades would be an irreplaceable tool for researchers and engineers, enabling improved accuracy in extreme value analysis, sediment transport studies, and wave-induced current simulations. Despite limited field observations, all available measured data within the region were collected, analyzed for configuration of the models and utilized for model calibration and validation. The hindcast data was generated using the Weather Research and Forecasting (WRF) model for winds and WAVEWATCH III (WW3) model for waves, and evaluated against observational and measured wind and wave parameters. A comprehensive statistical analysis of the hindcast model's performance reveals adequate agreement with measured data, as evidenced by root mean square errors (RMSEs) of 1.23 m/s for wind speeds and 0.37 m for significant wave heights in average. These results underscore the model's reliability for research and engineering applications, particularly in the Arabian Sea, with a focus on the northern coastlines of the Oman Sea. The specific model configuration employed in this study holds significant potential for future investigations in the northern Indian Ocean, offering a valuable tool for understanding and predicting climatical conditions in this region.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103882"},"PeriodicalIF":2.1,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Seasonal variation of coastal currents and residual currents in the CAT BA – HA long coastal area (VIET NAM): Results of coherens model","authors":"Vu Duy Vinh ,&nbsp;Nguyen Minh Hai ,&nbsp;Saheed Puthan Purayil ,&nbsp;Geneviève Lacroix ,&nbsp;Nguyen Thanh Duong","doi":"10.1016/j.rsma.2024.103874","DOIUrl":"10.1016/j.rsma.2024.103874","url":null,"abstract":"<div><div>The COHERENS model is used to investigate the temporal and spatial variation of the coastal currents in 2021 at the Cat Ba - Ha Long, northern Vietnam. The findings indicate that tidal oscillation has a notable impact on the current fields in short-term variations (hours to days). Meanwhile, the wind field and river discharge are the decisive factors affecting the seasonal variation of the current fields in Cat Ba - Ha Long coastal area. Furthermore, the characteristics of residual currents are significantly affected by river discharges and wind patterns, which vary across different months and seasons. During the southwest monsoon season (May to August), the residual currents have a prevailing direction towards the sea, from the west and south-southwest towards the east and north-northeast, reaching maximum speeds of approximately 0.1–0.15 m/s. Conversely, in the transitional and northeast monsoon seasons, the directions of residual currents are from the east-northeast to the west-southwest, with peak speed up to 0.2–0.25 m/s. Notably, the residual currents in the bottom and surface layers in the eastern-southwestern area of Cat Ba Island and the north of Ha Long Bay are in opposite directions.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103874"},"PeriodicalIF":2.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Forecasting the impact of marine heat waves on farmed bivalves Nodipecten nodosus and Magallana gigas","authors":"Roberta Rodrigues das Chagas Pereira ,&nbsp;Renan Ribeiro e Silva ,&nbsp;Vinicius Peruzzi de Oliveira ,&nbsp;Jean Louis Valentin","doi":"10.1016/j.rsma.2024.103883","DOIUrl":"10.1016/j.rsma.2024.103883","url":null,"abstract":"<div><div>Marine heat waves are considered a threat to the cultivation of commercially important species because exposure to thermal stress may lead to mass mortalities of organisms. Investigating the upper thermal limits of marine species and their capacity for shifting these limits can contribute to securing the sustainability of aquaculture activities as exposure to heat extremes is increasing in frequency. The scallop <em>Nodipecten nodosus</em> and oyster <em>Magallana</em> [<em>Crassostrea</em>] <em>gigas</em> are two bivalve species commercially farmed in Brazil and production of spat is undertaken mainly at two hatcheries located in different regions subjected to distinct climate and seawater temperature conditions over the year. This study investigated the upper thermal tolerance of populations of <em>N. nodosus</em> and <em>M. gigas</em> sourced from temperate and tropical farming areas. Groups of <em>N. nodosus</em> and <em>M. gigas</em> farmed under warmer temperature regimes exhibited lower mortality rates when exposed to elevated temperatures compared to groups sourced from cooler waters and consequently displayed higher values of lethal temperature 50 (LT50). <em>N. nodosus</em> exhibited superior thermal tolerance than was previously known, however, commercial cultivation of this species is still at risk of mass mortalities depending on the duration and intensity of forecasted heat waves in both cultivation regions. <em>M. gigas</em> showed a high capacity to endure acute thermal stress at the resting stage of the reproductive cycle. To enhance the aquaculture sector's resilience to climate change, we recommend the development of cultivation methods that account for marine and atmospheric heat wave events, alongside continuous monitoring of abiotic factors at farming sites.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103883"},"PeriodicalIF":2.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Microplastic and ichthyoplankton in the Ukrainian waters of the Black Sea","authors":"A.O. Snigirova ,&nbsp;R.V. Mihas ,&nbsp;S.O. Khutornoi ,&nbsp;A.K. Vinogradov ,&nbsp;Ye.I Gazyetov ,&nbsp;J.R. Gascooke ,&nbsp;S.M. Snigirov ,&nbsp;S.C. Leterme","doi":"10.1016/j.rsma.2024.103884","DOIUrl":"10.1016/j.rsma.2024.103884","url":null,"abstract":"<div><div>The ability of planktonic and neustonic organisms to feed on microplastics and subsequently transfer it through the marine food web has been studied extensively. However, there are no studies on microplastic in the Northwestern Black Sea. The present study assesses the diversity and spatial distribution of microplastics and ichthyoplankton in two surface layers: 0–5 cm (neuston surface layer; NL) and 5–20 cm (hyponeuston layer; HL). The sampling was undertaken in June 2020 – October 2021 in the coastal (CW) and open (OW) waters of the Northwestern Black Sea. Microplastics was observed at all studied sites and was composed of fibres (75 %) and fragments (25 %). Black and red fibres were the most abundant type of fibre, and black particles dominated the fragments. Four types of polymers were identified by Raman spectroscopy: polyethylene, polyester, polyurethane, polypropylene. The concentration of microplastics near the coast significantly exceeded that of open waters; the average microplastics concentration in the CW reached 136±74 (±SE) and 46±30 particles.m^-3 in the NL and HL, respectively, whereas it reached 18±3 and 2±0.8 particles.m^-3 in the NL and HL of the OW, respectively. In the NL, ichthyoplankton was found only at 31 % of the sites, and at only 24 % of sites in the HL. In total, 6 species of fish were recorded. The most abundant species was the European anchovy, one of the main commercial species in the Black Sea. The ratio of microplastics to ichthyoplankton was 0.34 (or 1:2.87) for both layers, where ichthyoplankton was present. When considering all studied sites, the ratio of microplastics to ichthyoplankton was 1.07 (or 1:0.93). As ichthyoplankton is an ephemeral component of the neuston community, but microplastics is omnipresent, we may consider that comparable densities of microplastics:ichthyoplankton favour their interrelation, negative effect, and transport through the food web.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103884"},"PeriodicalIF":2.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Enhanced detection and classification of microplastics in marine environments using deep learning","authors":"Pensiri Akkajit ,&nbsp;Md Eshrat E. Alahi ,&nbsp;Arsanchai Sukkuea","doi":"10.1016/j.rsma.2024.103880","DOIUrl":"10.1016/j.rsma.2024.103880","url":null,"abstract":"<div><div>Microplastics (MPs) pose a growing environmental threat due to their accumulation and ecological impact. This study aimed to overcome the limitations of traditional methods, which are labor-intensive and prone to errors, in order to detect and classify MPs more effectively against marine pollution. We assessed object detection and classification algorithms: YOLOv8x, YOLOv8x (with augmentation), YOLOv8m, YOLOv8m (with augmentation), YOLO-NAS-L, and YOLO-NAS-L (with augmentation), focusing on four MP morphologies: fiber, film, fragment, and pellet. The dataset was divided into 80 % for training (320 images), 20 % for validation (80 images), and a fixed testing set of 200 images. The images were augmented using rotation (+25° and −25°), resizing (640 × 640 pixels), zooming, auto-orient strips, flipping, and noise application. This expanded the training set by 300 %, resulting in a total of 1400 images. The YOLOv8 models, particularly when augmented, outperformed the YOLO-NAS-L models in both [email protected] and precision across all categories. Notably, YOLOv8x achieved an exceptional 99.0 % in both precision and [email protected], with an impressive inference time of only 1.2 ms per image. The implementation of augmentation significantly enhanced detection accuracy across various models. With augmentation, YOLOv8x, YOLOv8m, and YOLO-NAS-L consistently achieved precision levels exceeding 99 %. For real-time applications, YOLOv8x was selected for the web application designed to detect and classify MPs, providing a more accurate and efficient solution compared to conventional methods. This model serves as a valuable resource for researchers in MP analysis, improving accuracy and reliability in environmental monitoring.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103880"},"PeriodicalIF":2.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Spatial distribution of juvenile corals (Scleractinia) in the coastal and small islands of Sumatra, Indonesia","authors":"Muhammad Abrar ,&nbsp;Dietriech G. Bengen ,&nbsp;Neviaty P. Zamani ,&nbsp;Suharsono ,&nbsp;Giyanto ,&nbsp;Risandi D. Putra ,&nbsp;Ni Wayan. P. Sari ,&nbsp;Rikoh M. Siringoringo ,&nbsp;Tri A. Hadi ,&nbsp;Rizkie S. Utama ,&nbsp;Bambang Hermanto ,&nbsp;Ucu Y. Arbi ,&nbsp;Frensly D. Hukom ,&nbsp;La Ode Alifatri ,&nbsp;Sam Wouthuyzen ,&nbsp;Peter Harrison","doi":"10.1016/j.rsma.2024.103857","DOIUrl":"10.1016/j.rsma.2024.103857","url":null,"abstract":"<div><div>Coral community structure exhibits variation at each stage of its life cycle, but the spatial distribution of corals in early life stages, including from juvenile to adult stages, is not well understood, especially at a larger scale. Spatially, our study compared the genera richness and abundance of juvenile and sub/adult corals at 9 locations and 83 sites along the coast and small islands of western and eastern Sumatra, Indonesia. Field surveys were conducted by recording juvenile corals measuring ≤5 cm in diameter in 1 ×1 m quadrat transects with 6 times randomly at each site, while those with diameters greater than 5–10 cm were categorized as transitional to sub/adult corals. A total of 52 genera from 16 juvenile coral families were recorded and identified, which is higher than the sub/adult level, where a total of 40 genera from 14 families were found. The most common genera came from the Acroporidae (23.0 %), Merulinidae (18.7 %), and Agariciidae (12.7 %) families. The genera richness at the juvenile stage showed variation between locations and regions in western and eastern Sumatra, except between locations in the eastern region, while at the sub/adult stage there was no variation between the western and eastern regions. Abundance at the juvenile stage also showed variation between locations, but did not differ between the western and eastern regions and at locations in the eastern region. In contrast, coral abundance at the sub/adult stage showed differences between locations and regions, but did not show variation at locations in the eastern region. The abundance of juvenile corals was influenced by live coral cover, the presence of herbivorous and corallivorous reef fish, and hard substrates of dead coral, limited to sandy or muddy bottoms and coral rubble. Genera richness was also influenced by live coral cover, but limited by sandy and rubble reef habitats, the cover of other biota such as soft corals, and the presence of herbivorous fish. Variations in water conditions and geomorphological forms between locations on the west and east sides of Sumatra impacted the diversity and abundance of corals in the early stages of life, affecting their success in becoming adult colonies. The transition from juvenile to sub/adult corals emerged as a critical phase in the early life stages of coral for population maintenance and sustainability.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":"80 ","pages":"Article 103857"},"PeriodicalIF":2.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}