Regional Studies in Marine Science最新文献

Life history traits and abundance trends of emperor fish Lethrinus nebulosus and L. lentjan (Teleostei: Lethrinidae) in the western Arabian Gulf 阿拉伯湾西部帝王鱼 Lethrinus nebulosus 和 L. lentjan（远洋鱼类：帝王鱼科）的生活史特征和丰量趋势

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-13 DOI: 10.1016/j.rsma.2024.103916

Yu-Jia Lin , Premlal Panickan , Abdu Rahiman Kambrath Pulikkoden , Nabil Fita , Ali M. Qasem , Lotfi J. Rabaoui , Ruben H. Roa-Ureta , Mohammad A. Qurban

Overexploitation and habitat loss are the two most important threats that cause the losses of marine populations. The understanding of the relationships between life histories and vulnerability to overexploitation could provide the basis for predicting possible trajectories of abundance under increasing levels of fishing pressure. The spangled emperor Lethrinus nebulosus and the pink ear emperor Lethrinus lentjan are the most important species contributing to the landings of the western Arabian Gulf. In this study, we integrated multiple surveys to provide information about life history traits, spatial distributions, and fisheries-dependent and independent abundance indexes from 1997 to 2015 and tested the hypothesis that the species of higher vulnerability more likely exhibited a declining population trend. Both species have experienced an increase of 100 % in fishing exploitation pressure since 1997, and L. nebulosus is expected to exhibit a declining population more likely based on the life history traits and other vulnerability indexes. However, we did not observe declines in fisheries-dependent and -independent population indexes of L. nebulosus, which might be due to its preference of residing in the northern areas where high numbers of oil-gas facility patchworks are installed and fishing activities are much restricted. The fisheries-dependent abundance index of L. lentjan from the large boats significantly correlated with the abundance index from the coral reef monitoring. Information included in this study can be used for fisheries stock assessment models in the future and we recommended that the emperor fisheries could benefit from the conservation of the coral reefs.

{"title":"Life history traits and abundance trends of emperor fish Lethrinus nebulosus and L. lentjan (Teleostei: Lethrinidae) in the western Arabian Gulf","authors":"Yu-Jia Lin , Premlal Panickan , Abdu Rahiman Kambrath Pulikkoden , Nabil Fita , Ali M. Qasem , Lotfi J. Rabaoui , Ruben H. Roa-Ureta , Mohammad A. Qurban","doi":"10.1016/j.rsma.2024.103916","DOIUrl":"10.1016/j.rsma.2024.103916","url":null,"abstract":"<div><div>Overexploitation and habitat loss are the two most important threats that cause the losses of marine populations. The understanding of the relationships between life histories and vulnerability to overexploitation could provide the basis for predicting possible trajectories of abundance under increasing levels of fishing pressure. The spangled emperor <em>Lethrinus nebulosus</em> and the pink ear emperor <em>Lethrinus lentjan</em> are the most important species contributing to the landings of the western Arabian Gulf. In this study, we integrated multiple surveys to provide information about life history traits, spatial distributions, and fisheries-dependent and independent abundance indexes from 1997 to 2015 and tested the hypothesis that the species of higher vulnerability more likely exhibited a declining population trend. Both species have experienced an increase of 100 % in fishing exploitation pressure since 1997, and <em>L. nebulosus</em> is expected to exhibit a declining population more likely based on the life history traits and other vulnerability indexes. However, we did not observe declines in fisheries-dependent and -independent population indexes of <em>L. nebulosus</em>, which might be due to its preference of residing in the northern areas where high numbers of oil-gas facility patchworks are installed and fishing activities are much restricted. The fisheries-dependent abundance index of <em>L. lentjan</em> from the large boats significantly correlated with the abundance index from the coral reef monitoring. Information included in this study can be used for fisheries stock assessment models in the future and we recommended that the emperor fisheries could benefit from the conservation of the coral reefs.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653288","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}

引用次数: 0

Bottom water hypoxia enhanced by vertical migration of the raphidophyte Chattonella sp. in the Ariake Sea, Japan 日本有明海蚜蝇藻垂直迁移导致底层水缺氧加剧

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-13 DOI: 10.1016/j.rsma.2024.103919

Yuichi Hayami , Naoki Fujii , Kazumaro Okamura , Hiroyuki Takasu , Yu Umezawa , Minoru Wada

In general, the formation of hypoxic water masses in coastal waters is caused by the restriction of vertical oxygen transport due to enhanced stratification, and the increase in oxygen consumption due to the decomposition of organic matter supplied from phytoplankton blooms. However, the direct relationship between phytoplankton blooms and hypoxia has been rarely reported. In this study, we clarified the relationship between the development of a hypoxic water mass (< 3 mg L⁻¹) and a bloom of the raphidophyte Chattonella sp. in the Ariake Sea, Japan through field surveys and experiments to measure the water oxygen demand. The process of development of and recovery from the hypoxic water mass in a spring-neap tidal cycle was observed. From the spring to the neap tide, high-salinity, high-density water from offshore intruded into the bottom layer of the inner part of the bay, strengthening the stratification and developing a hypoxic water mass. In this period, the bacterial oxygen demand was dominant during the day in the bottom layer. At night, oxygen consumption increased due to the respiration of Chattonella that had accumulated in the bottom layer, reaching five times the amount during the day. In the following spring tides, the stratification weakened and the hypoxic water mass disappeared. However, water oxygen demand was the highest, suggesting the influence of the decay of Chattonella that caused the bloom. These results indicate that the increase in oxygen consumption at night due to the diurnal vertical migration of Chattonella greatly influenced the development of the hypoxic water mass.

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引用次数: 0

The dynamic adjusted system of sea use fees: An empirical research on the sea use management in Zhejiang province 动态调整的海域使用金制度：浙江省海域使用管理实证研究

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-10 DOI: 10.1016/j.rsma.2024.103910

Guanqiong Ye , Zeben Lian , Chong Chen , Chunyu Lin , Zhiguo He , Weidong Shang , Yongchao Zheng

To prevent excessive exploitation of sea resources by developers, countries around the world have established systems for managing sea use. The system of sea use fees in China is continually improving, but it cannot reflect the full value of marine natural resources. Therefore, an optimization mechanism for dynamic adjustment which considered the value of marine natural resources and the adjustment coefficient of sea area fees was constructed in the study. This study explored the difference between marine resources zoning and the dynamic adjustment standard of sea use fees collection and took Zhejiang province as an example. The results showed that the comprehensive scores of coastal marine resources were generally higher than those of the open sea in Zhejiang province. Furthermore, the comprehensive scores of important ecological areas such as bays and islands were higher than those of other marine areas, and the comprehensive score of Ningbo sea area was significantly higher than those of other sea areas. On the basis, there are six classes of the adjustment range of the sea use fees standard were divided in Zhejiang province in the study. The overall increase of fee was 3.9–8.0 %. The results of study can assist decision-making by evaluating the value of marine resources and the adjustment of sea area usage royalties, which will help to improve the efficiency of sea area management.

{"title":"The dynamic adjusted system of sea use fees: An empirical research on the sea use management in Zhejiang province","authors":"Guanqiong Ye , Zeben Lian , Chong Chen , Chunyu Lin , Zhiguo He , Weidong Shang , Yongchao Zheng","doi":"10.1016/j.rsma.2024.103910","DOIUrl":"10.1016/j.rsma.2024.103910","url":null,"abstract":"<div><div>To prevent excessive exploitation of sea resources by developers, countries around the world have established systems for managing sea use. The system of sea use fees in China is continually improving, but it cannot reflect the full value of marine natural resources. Therefore, an optimization mechanism for dynamic adjustment which considered the value of marine natural resources and the adjustment coefficient of sea area fees was constructed in the study. This study explored the difference between marine resources zoning and the dynamic adjustment standard of sea use fees collection and took Zhejiang province as an example. The results showed that the comprehensive scores of coastal marine resources were generally higher than those of the open sea in Zhejiang province. Furthermore, the comprehensive scores of important ecological areas such as bays and islands were higher than those of other marine areas, and the comprehensive score of Ningbo sea area was significantly higher than those of other sea areas. On the basis, there are six classes of the adjustment range of the sea use fees standard were divided in Zhejiang province in the study. The overall increase of fee was 3.9–8.0 %. The results of study can assist decision-making by evaluating the value of marine resources and the adjustment of sea area usage royalties, which will help to improve the efficiency of sea area management.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653321","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}

引用次数: 0

Seasonal nitrogen sources and its transformation processes revealed by dual-nitrate isotopes in Xiamen Bay, China 双硝酸根同位素揭示中国厦门湾的季节性氮源及其转化过程

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-09 DOI: 10.1016/j.rsma.2024.103902

Yiqian Shi , Liping Jiao , Sizhe Qiu , Chen Huang , Zhi Zeng , Ying Zhang , Xunyao Zhang , Shuqin Tao , Jinpei Yan , Kai Zhang

The eutrophication load in coastal waters is gradually increasing due to excessive nitrate (NO₃⁻) input caused by intense human activities. The tracing of NO₃⁻ sources as well as their biogeochemistry is crucial for the development of effective measures to alleviate the eutrophication load. In this study, seasonal seawater samples from Xiamen Bay were investigated to explore the sources and fates of NO₃⁻ using dual nitrate isotopes. The results indicated that the NO₃⁻ is less affected by biological processes and mainly influenced by the terrestrial sewage discharges (48 %) during rainy seasons. Contrarily, as runoff input decreases and external seawater intrusion increases, the assimilation of phytoplankton dominates the process of nitrate removal during dry seasons. This study suggests that the increase in the input of terrestrial sewage nutrients is responsible for the increase in eutrophication in Xiamen Bay, providing a basis for controlling water eutrophication and regional environmental governance.

{"title":"Seasonal nitrogen sources and its transformation processes revealed by dual-nitrate isotopes in Xiamen Bay, China","authors":"Yiqian Shi , Liping Jiao , Sizhe Qiu , Chen Huang , Zhi Zeng , Ying Zhang , Xunyao Zhang , Shuqin Tao , Jinpei Yan , Kai Zhang","doi":"10.1016/j.rsma.2024.103902","DOIUrl":"10.1016/j.rsma.2024.103902","url":null,"abstract":"<div><div>The eutrophication load in coastal waters is gradually increasing due to excessive nitrate (NO<sub>3</sub><sup>−</sup>) input caused by intense human activities. The tracing of NO<sub>3</sub><sup>−</sup> sources as well as their biogeochemistry is crucial for the development of effective measures to alleviate the eutrophication load. In this study, seasonal seawater samples from Xiamen Bay were investigated to explore the sources and fates of NO<sub>3</sub><sup>−</sup> using dual nitrate isotopes. The results indicated that the NO<sub>3</sub><sup>−</sup> is less affected by biological processes and mainly influenced by the terrestrial sewage discharges (48 %) during rainy seasons. Contrarily, as runoff input decreases and external seawater intrusion increases, the assimilation of phytoplankton dominates the process of nitrate removal during dry seasons. This study suggests that the increase in the input of terrestrial sewage nutrients is responsible for the increase in eutrophication in Xiamen Bay, providing a basis for controlling water eutrophication and regional environmental governance.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653308","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}

引用次数: 0

A spatio-temporal assessment of seawater quality in Miri-Sibuti Coral Reef: Evaluating for metal pollution, sources and dynamics 米里-锡布提珊瑚礁海水质量时空评估：评估金属污染、来源和动态

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-09 DOI: 10.1016/j.rsma.2024.103903

Sun Veer Moollye , Prasanna Mohan Viswanathan , Nagarajan Ramasamy , Anshuman Mishra , Chidambaram Sabarathinam , Chua Han Bing

Coral environments are sensitive to seawater quality, and their sustenance depends on understanding the dynamics of geochemical variables, especially in trace levels. Miri-Sibuti Coral Reef National Park (MSCRNP) is a unique marine reserve in the state of Sarawak, NW Borneo, Malaysia, which attracts tourists worldwide. In this study, seawater samples were collected from MSCRNP in three different diving sites (Eve’s Garden (EG), Anemone Garden (AG) and North Siwa (NS)) at different depths for three seasons (pre-southwest monsoon (PRSWM), post-southwest monsoon (POSWM) and northeast monsoon (NEM). Insitu parameters (temperature, pH, salinity and turbidity) were measured in the field. The concentration of trace metals was determined in the water column (sea surface layer, middle layer and bottom water) using standard procedure. Statistics and pollution indices were used to identify the possible sources of metals and the pollution status of the seawater. From the analytical results, the vertical distribution of trace metal concentrations with respect to the locations and seasons was identified. pH ranging from 7.8 to 8.4 with a depth-wise increasing trend in NS during NEM. Similarly, a decreasing trend of turbidity was observed in AG and EG in all the seasons with respect to depth. A higher concentration of trace metals was observed during NEM, particularly at EG and NS. Fe, Ni and Pb are the dominant metals in all the seasons. Fe concentration varies from 789 to 1478 µg/L, averaging 1112 µg/L irrespective of seasons and locations. The suspended solids/sediments discharged by the river runoff were the main contributor to the distribution of metals. The release of metals from the suspended particles through desorption at the surface layers and the exchange of metals between water-sediment interface at the bottom water were observed. In addition, coastal development and other anthropogenic activities in this region were also contributed to the metal pollution.

{"title":"A spatio-temporal assessment of seawater quality in Miri-Sibuti Coral Reef: Evaluating for metal pollution, sources and dynamics","authors":"Sun Veer Moollye , Prasanna Mohan Viswanathan , Nagarajan Ramasamy , Anshuman Mishra , Chidambaram Sabarathinam , Chua Han Bing","doi":"10.1016/j.rsma.2024.103903","DOIUrl":"10.1016/j.rsma.2024.103903","url":null,"abstract":"<div><div>Coral environments are sensitive to seawater quality, and their sustenance depends on understanding the dynamics of geochemical variables, especially in trace levels. Miri-Sibuti Coral Reef National Park (MSCRNP) is a unique marine reserve in the state of Sarawak, NW Borneo, Malaysia, which attracts tourists worldwide. In this study, seawater samples were collected from MSCRNP in three different diving sites (Eve’s Garden (EG), Anemone Garden (AG) and North Siwa (NS)) at different depths for three seasons (pre-southwest monsoon (PRSWM), post-southwest monsoon (POSWM) and northeast monsoon (NEM). <em>Insitu</em> parameters (temperature, pH, salinity and turbidity) were measured in the field. The concentration of trace metals was determined in the water column (sea surface layer, middle layer and bottom water) using standard procedure. Statistics and pollution indices were used to identify the possible sources of metals and the pollution status of the seawater. From the analytical results, the vertical distribution of trace metal concentrations with respect to the locations and seasons was identified. pH ranging from 7.8 to 8.4 with a depth-wise increasing trend in NS during NEM. Similarly, a decreasing trend of turbidity was observed in AG and EG in all the seasons with respect to depth. A higher concentration of trace metals was observed during NEM, particularly at EG and NS. Fe, Ni and Pb are the dominant metals in all the seasons. Fe concentration varies from 789 to 1478 µg/L, averaging 1112 µg/L irrespective of seasons and locations. The suspended solids/sediments discharged by the river runoff were the main contributor to the distribution of metals. The release of metals from the suspended particles through desorption at the surface layers and the exchange of metals between water-sediment interface at the bottom water were observed. In addition, coastal development and other anthropogenic activities in this region were also contributed to the metal pollution.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653317","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}

引用次数: 0

Great baleen whales, great services 伟大的须鲸，伟大的服务

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-09 DOI: 10.1016/j.rsma.2024.103913

Déborah Magalhães de Melo , Fabiana Cézar Félix-Hackradt , Carlos Werner Hackradt

Over centuries, the human-whale interactions has evolved from perceiving them as monsters to recognition of whales as vital contributors, particularly for coastal communities. Great baleen whales play a crucial role in connecting the oceans through their migrations, facilitating a flow of nature's benefits to humans. Ecosystem services, encompassing tourism, education, and religious practices, offer returns. In addition, whales stimulate primary productivity, maintain biodiversity, and fertilize oceans with nutrient-rich excretions. Moreover, through their direct/indirect carbon fixation and sequestration, whales can be viewed as mitigators of climate change. Species of the family Balaenopteridae are distributed across different latitudes and oceans. Mapping tool serves as an effective method for characterizing the actual benefits that ecosystems provide to society, allowing the identification of priority areas for conservation. This study synthesized, mapped and verified the presence of “hotspots” of services provided by Balaenoptera musculus, Balaenoptera physalus, Balaenoptera borealis, Balaenoptera acutorostrata, and Megaptera novaeangliae, revealing provisioning, cultural, regulatory, and maintenance services through a systematic literature review. Recognizing the complex spatial dynamics of these roles as crucial socioeconomically and culturally, it is imperative to integrate them into spatial and management planning. This inclusive approach brings a pluralistic perspective and clarifies the provision of ecosystem services by area, ultimately ensuring more efficient marine management and the sustainability of marine ecosystems.

{"title":"Great baleen whales, great services","authors":"Déborah Magalhães de Melo , Fabiana Cézar Félix-Hackradt , Carlos Werner Hackradt","doi":"10.1016/j.rsma.2024.103913","DOIUrl":"10.1016/j.rsma.2024.103913","url":null,"abstract":"<div><div>Over centuries, the human-whale interactions has evolved from perceiving them as monsters to recognition of whales as vital contributors, particularly for coastal communities. Great baleen whales play a crucial role in connecting the oceans through their migrations, facilitating a flow of nature's benefits to humans. Ecosystem services, encompassing tourism, education, and religious practices, offer returns. In addition, whales stimulate primary productivity, maintain biodiversity, and fertilize oceans with nutrient-rich excretions. Moreover, through their direct/indirect carbon fixation and sequestration, whales can be viewed as mitigators of climate change. Species of the family Balaenopteridae are distributed across different latitudes and oceans. Mapping tool serves as an effective method for characterizing the actual benefits that ecosystems provide to society, allowing the identification of priority areas for conservation. This study synthesized, mapped and verified the presence of “hotspots” of services provided by <em>Balaenoptera musculus</em>, <em>Balaenoptera physalus</em>, <em>Balaenoptera borealis</em>, <em>Balaenoptera acutorostrata</em>, and <em>Megaptera novaeangliae</em>, revealing provisioning, cultural, regulatory, and maintenance services through a systematic literature review. Recognizing the complex spatial dynamics of these roles as crucial socioeconomically and culturally, it is imperative to integrate them into spatial and management planning. This inclusive approach brings a pluralistic perspective and clarifies the provision of ecosystem services by area, ultimately ensuring more efficient marine management and the sustainability of marine ecosystems.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653371","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}

引用次数: 0

Sharing the ocean: Fostering blue synergies for sustainable whale-watching 共享海洋：促进可持续观鲸的蓝色协同作用

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-09 DOI: 10.1016/j.rsma.2024.103905

Raquel de la Cruz-Modino , José J. Pascual-Fernández , David Domínguez-González , Grecy Pérez-Amores , Carla González-Cruz , Agustín Santana-Talavera , Patricia Arranz

Whale-based tourism activities offer unique opportunities for humans to observe cetaceans in their natural habitats. Well-planned experiences can provide educational value and promote respectful enjoyment of marine wildlife. Conversely, poorly managed activities can negatively impact cetaceans by injuring or killing them (through collisions with boats) or altering their behaviour, such as resting time, nursing or diving. This study presents an example of designing and implementing a whale-based tourism activity in the Canary Islands (Spain), with the participation of researchers, whale-watching operators and tour guides, public policy-makers, and civil society, with a strong focus on educational values. The coastal communities are crucial in promoting sustainable whale-watching practices through educational initiatives, community engagement, and stakeholder collaboration. The paper employs a process-monitoring approach to evaluate the whole procedure of whale-watching activity implementation. We assume that the success of any tourism activity depends on the process that leads to its creation. The analysis emphasizes the need for careful planning and execution to design and implement marine tourism experiences. Concerns for tourism satisfaction and safety and the need for environmental sustainability challenge the management of whale-watching operations. In this regard, engaging local communities, addressing safety and conservation concerns, and promoting responsible tourism practices are essential for mitigating these challenges and ensuring the long-term viability of whale watching as a sustainable and educational activity.

{"title":"Sharing the ocean: Fostering blue synergies for sustainable whale-watching","authors":"Raquel de la Cruz-Modino , José J. Pascual-Fernández , David Domínguez-González , Grecy Pérez-Amores , Carla González-Cruz , Agustín Santana-Talavera , Patricia Arranz","doi":"10.1016/j.rsma.2024.103905","DOIUrl":"10.1016/j.rsma.2024.103905","url":null,"abstract":"<div><div>Whale-based tourism activities offer unique opportunities for humans to observe cetaceans in their natural habitats. Well-planned experiences can provide educational value and promote respectful enjoyment of marine wildlife. Conversely, poorly managed activities can negatively impact cetaceans by injuring or killing them (through collisions with boats) or altering their behaviour, such as resting time, nursing or diving. This study presents an example of designing and implementing a whale-based tourism activity in the Canary Islands (Spain), with the participation of researchers, whale-watching operators and tour guides, public policy-makers, and civil society, with a strong focus on educational values. The coastal communities are crucial in promoting sustainable whale-watching practices through educational initiatives, community engagement, and stakeholder collaboration. The paper employs a process-monitoring approach to evaluate the whole procedure of whale-watching activity implementation. We assume that the success of any tourism activity depends on the process that leads to its creation. The analysis emphasizes the need for careful planning and execution to design and implement marine tourism experiences. Concerns for tourism satisfaction and safety and the need for environmental sustainability challenge the management of whale-watching operations. In this regard, engaging local communities, addressing safety and conservation concerns, and promoting responsible tourism practices are essential for mitigating these challenges and ensuring the long-term viability of whale watching as a sustainable and educational activity.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653315","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}

引用次数: 0

Ectoparasite infection levels differ between fish from upwelling-exposed and sheltered rocky reefs areas in Brazil 巴西暴露在上升流中的岩礁鱼类和避风岩礁鱼类的体外寄生虫感染水平不同

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-08 DOI: 10.1016/j.rsma.2024.103909

Pauline Narvaez , Marta C Soares , Cesar AMM Cordeiro , Miguel Furtado , Vinicius J. Giglio , Renata Mazzei , Carlos EL Ferreira

Ubiquitous and abundant within marine ecosystems, parasites play essential ecological roles such as shaping host population dynamics, altering competition between species, and influencing energy flows through communities. Their diversity and population dynamics are demonstrably shaped by both seasonal and geographic variations. These variations have been often explored at broad spatial scale. However, parasite communities can exhibit significant disparities even at small spatial scales, driven by factors such as wave exposure, temperature fluctuations, and benthic habitat composition. We investigated how crustacean parasites of fish – caligids and gnathiids - differed between two distinct habitats, which are separated solely by a few kilometres, at Arraial do Cabo, Brazil. These two habitats are characterised by a sheltered embayment (hereinafter referred to as “inside”) or an exposed upwelling habitat (hereinafter referred to as “outside”). Individual fish from four species were examined in both habitats. We found that the infestation rate of caligids varied among fish species and, gnathiids varied between the two sampling sites. Gnathiids were absent from fish outside, while they were present on fish inside the embayment. This disparity suggests a critical role of local environmental factors in shaping gnathiid distribution. Potential drivers include temperature fluctuations, substrate composition, and wave exposure, which differed markedly between the two sites. Conversely, caligid parasites infected fish in both locations. While environmental factors may also influence caligid abundance, they appear to exhibit greater tolerance compared to gnathiids. These findings emphasize the importance of incorporating fine-scale environmental heterogeneity when investigating parasite distribution patterns.

{"title":"Ectoparasite infection levels differ between fish from upwelling-exposed and sheltered rocky reefs areas in Brazil","authors":"Pauline Narvaez , Marta C Soares , Cesar AMM Cordeiro , Miguel Furtado , Vinicius J. Giglio , Renata Mazzei , Carlos EL Ferreira","doi":"10.1016/j.rsma.2024.103909","DOIUrl":"10.1016/j.rsma.2024.103909","url":null,"abstract":"<div><div>Ubiquitous and abundant within marine ecosystems, parasites play essential ecological roles such as shaping host population dynamics, altering competition between species, and influencing energy flows through communities. Their diversity and population dynamics are demonstrably shaped by both seasonal and geographic variations. These variations have been often explored at broad spatial scale. However, parasite communities can exhibit significant disparities even at small spatial scales, driven by factors such as wave exposure, temperature fluctuations, and benthic habitat composition. We investigated how crustacean parasites of fish – caligids and gnathiids - differed between two distinct habitats, which are separated solely by a few kilometres, at Arraial do Cabo, Brazil. These two habitats are characterised by a sheltered embayment (hereinafter referred to as “inside”) or an exposed upwelling habitat (hereinafter referred to as “outside”). Individual fish from four species were examined in both habitats. We found that the infestation rate of caligids varied among fish species and, gnathiids varied between the two sampling sites. Gnathiids were absent from fish outside, while they were present on fish inside the embayment. This disparity suggests a critical role of local environmental factors in shaping gnathiid distribution. Potential drivers include temperature fluctuations, substrate composition, and wave exposure, which differed markedly between the two sites. Conversely, caligid parasites infected fish in both locations. While environmental factors may also influence caligid abundance, they appear to exhibit greater tolerance compared to gnathiids. These findings emphasize the importance of incorporating fine-scale environmental heterogeneity when investigating parasite distribution patterns.</div></div>","PeriodicalId":21070,"journal":{"name":"Regional Studies in Marine Science","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653307","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}

引用次数: 0

Dose-specific toxicity of naphthalene (Polycyclic Aromatic Hydrocarbon) and subsequent recovery by humic feed-o-fert on Anabas testudineus (Bloch): Blood biochemical and morphological introspections 萘（多环芳香烃）的剂量特异性毒性以及腐殖质饲料-肥料对 Anabas testudineus (Bloch) 的后续恢复作用：血液生化和形态学观察

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-08 DOI: 10.1016/j.rsma.2024.103912

Sukhendu Dey , Megha Santra , Subhas Das, Apurba Ratan Ghosh

Polycyclic aromatic hydrocarbons (PAHs) are pervasive contaminants in aquatic ecosystems, yet their specific effects on blood pathophysiology, including alterations in blood biochemical and morphological introspections, remain largely unexplored. As consequence, the present study is aimed to record the toxicity of naphthalene exposure for 21-d under two selected doses 0.7075 mg/L (T1) and 1.415 mg/L (T2), i.e., 25 and 50 % of LC₅₀ value [2.83 mg/L] respectively and subsequent recovery with one improved organic solid waste, feed-promoter Humic feed-o-fert (HF) of 0.5 g/L for the same duration of 21-d. The results showed significant increment in values in blood biochemical parameters, viz., cholesterol (CHOLES), glucose (GLU), glutamine pyruvic transmission (GPT), calcium (Ca), alkaline phosphatase (ALP), high density lipoprotein (HDL) and low density lipoprotein (LDL), and some displayed decreasing trend like protein (PRO), albumin (ALB) and triglyceride (Trig) under this exposure. During recovery phase with HF, the nature of biochemical changes became reversed showing significant restoration and repairment in comparison to naphthalene treatment. Morphological alterations of blood cells revealed maximum changes and appearance, such as tear drop-like cells (Tr), sickle cells (Sk), swelled cells (Sc) and vacuolated cells (Va) under two doses of exposure in 21-d, but under recovery with HF the cells approached towards regaining the normal contour of leucocytes (L), erythrocytes (Er) and tear drop like cells (Tr). So, it can be inferred that Humic feed-o-fert (HF) here played an important role to resist the haematological impairments in fish against the naphthalene (PAH) exposure. Further, Humic feed-o-fert (HF) may contribute in aquatic ecosystem restoration against the environmental contaminants, especially PAHs in aquaculture.

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引用次数: 0

An interdisciplinary view of a world heritage site and one of the most important eutrophic estuaries in Brazil, Guanabara bay 对世界遗产和巴西最重要的富营养化河口之一瓜纳巴拉湾的跨学科研究

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science

Pub Date : 2024-11-08 DOI: 10.1016/j.rsma.2024.103906

Ana Dalva de Oliveira Santos , Marilia Teresa Lima do Nascimento , Alex da Silva de Freitas , Rejany Ferreira dos Santos , Cintia Ferreira Barreto , Rachel Ann Hauser-Davis , José Antônio Baptista Neto

Internationally renowned, Guanabara Bay, located in the state of Rio de Janeiro, southeastern Brazil, has been recognized by the United Nations as a World Heritage Site since 2012. Despite receiving exorbitant amounts of daily discharges of untreated sewage from approximately 8.5 million inhabitants residing in its surroundings, as well as from nearby industrial and port areas, this bay is one of the most important Brazilian coastal estuaries and a vital source of sustenance for the surrounding population. Initiatives for the bay’s depollution were initiated in the 1990 s with different public and private bodies acting alongside research institutions, but this objective has still not been achieved. In this context, this study aimed to conduct a comprehensive literature review on Guanabara Bay studies conducted from the 1970s to 2023. Searches were carried out at the Scopus and Web of Science databases, retrieving a total of 1292 articles in English, reduced to 826 documents after filtering. The findings demonstrate a gradual, consistent and significant increase in the number of studies concerning the bay by both Brazilian and international researchers. The network of research groups and institutions that contributed most to monitoring the bay is also discussed. The data highlights the fact that, even after decades of research in this region, due to its economic, social and environmental importance and the lack of planning for its complete depollution, many research groups are continuously carrying out efforts to monitor this important Brazilian bay. Most studies deal with chemical contamination, although some assessments report noise pollution and solid pollution (microplastics).

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引用次数: 0