South Sea Research Articles

Cardiorespiratory patterns of male South American sea lions (Otaria flavescens) resting on land.

The goal of this study was to characterize the cardiorespiratory patterns of male South American sea lions (SASLs, Otaria flavescens) resting on land. We recorded respiratory and heart rate (n = 360 individuals studied) by observing the nostrils, chest movements and the impact of the heart on the thoracic wall. The sea lions breathe apneustically with a pause on inspiration, representing 74% of the respiratory cycle. The mean breathing frequency was 3.2 ± 1.0breathsmin-1, with a breathing cycle presenting periods of bradypneas, tachypneas, and long-term post-inspiratory pauses. The normal heart rate (nHR) was 73.4 ± 14.5beats min-1 and no significant differences were observed between age classes. All animals showed variability in HR in relation to respiratory phases (Inspiration: 101.2 ± 18.4beatsmin-1; post-inspiratory pause: 73.4 ± 14.5beatsmin-1; expiration: 64.6 ± 17.7beatsmin-1), consistent with respiratory sinus arrhythmia (RSA). The mean HR (measured during all respiratory phases) was 79.9 ± 22.7beatsmin-1, and was significantly different between age classes. The total duration of respiratory cycle, and duration of both inspiration and expiration, decreased with an increment in ambient temperature, with no variation in the pause duration. Heart rate during pause and expiration was significantly higher during high temperatures. Similar changes in cardiorespiratory patterns have been reported in other pinnipeds. Our results showed ontogenetic differences in development and typical variations with environmental and behavioral variables.

Projected Changes in the Onset of the Summer Monsoon over the South Asian Marginal Seas Modulated by Intraseasonal Oscillation

Abstract The onset of the summer monsoon associated with global warming is of great concern to the scientific community. While observational data diagnosis has shown the impact of intraseasonal oscillation (ISO) on the monsoon onset, how the ISO may affect the onset of monsoon under global warming remains unknown. Here, by analyzing the onset of the summer monsoon over the South Asian marginal seas projected by models in phase 6 of the Coupled Model Intercomparison Project (CMIP6) under the SSP5–8.5 scenario, we show evidence that the majority of models (>70%) project an earlier onset over the Arabian Sea (ArS) but a delayed onset over the Bay of Bengal (BoB) and the South China Sea (SCS). The temporal shifts of the monsoon onset are attributed to the changes in the premonsoon northward migration of equatorial ISO (NMISO), which is a trigger of monsoon onset and will be advanced (postponed) over the ArS (BoB and SCS). The subtropical upper-level westerly anomaly, inducing delayed occurrence of easterly shear, acts to delay the NMISO over the entire Indian Ocean. However, the intensified low-level southerly wind over the ArS, as well as its induced asymmetric pattern of boundary layer moisture work together to advance the premonsoon NMISO in the area, outweighing the delayed impact from vertical shear. These large-scale circulation changes are driven by tropical warming in the upper troposphere, land warming over the Arabian Peninsula, and ocean warming over the eastern Pacific. This analysis enriches monsoon onset projections by highlighting the role of ISO in influencing the future changes in monsoon onset.

Indonesia's Defense Diplomacy Strategy in Facing China's Gray Zone in the South Chine Sea

Purpose: This study aims to identify an effective strategy for Indonesia to counter China's gray zone tactics in the South China Sea. Theoretical Reference: Employing a quantitative method with a descriptive approach rooted in the positivist philosophy, this research follows the principles outlined by Sugiyono (2011). This method is chosen for investigating specific populations or samples, with a focus on quantitative/statistical data analysis to test predetermined hypotheses. Method: The research employs multiple regression analysis to assess the significance of Soft Power Diplomacy and Smart Power Diplomacy strategies as essential national resources for persuading China to undertake desired actions in addressing the challenges posed by China's Gray Zone in the South China Sea. Smart power, as defined by Jr J.N. (2007), involves integrating soft and hard power for a comprehensive strategy. According to R. Wilson (2008), smart power effectiveness lies in combining a robust military force with investments in alliances, partnerships, and cooperation. Result and Conclusion: The findings indicate that both Soft Power Diplomacy and Smart Power Diplomacy are influential tools and strategies within Indonesia's foreign policy context to effectively navigate and counteract China's Gray Zone activities in the South China Sea. Implications of Research: The identified strategies hold significant implications for shaping Indonesia's defense diplomacy against China's gray zone tactics, emphasizing the importance of integrating soft and hard power elements for a more comprehensive and efficient approach. Originality/Value: This research contributes to the field by highlighting the relevance and effectiveness of Soft Power Diplomacy and Smart Power Diplomacy as key components in Indonesia's defense diplomacy strategy, providing a nuanced understanding of countering China's Gray Zone activities in the South China Sea.

The Sedimentation Range of the MIS 3 Old Yellow River Delta, South Yellow Sea

The Sedimentation Range of the MIS 3 Old Yellow River Delta, South Yellow Sea

Trophic variability of inter- and intra-copepod species in the South Sea of Korea during summer

Spatial variation and interspecies differences in the trophic position (TP) of copepods were investigated using nitrogen isotope ratios of amino acids. In the summer of 2021, coastal waters and the Changjiang diluted water generated clear seawater temperature and salinity fronts in the South Sea of Korea. Paracalanus parvus s. l. was a dominant species in the copepod community, and the second dominant species differed among inshore, intermediate, and offshore sites. The TP of each copepod species was estimated in two ways, considering only metazoan diets (TPGlu, based on glutamic acid and phenylalanine nitrogen isotope ratios) and both metazoan and protistan diets (TPAla, based on alanine and phenylalanine nitrogen isotope ratios). Both TPGlu and TPAla indicated trophic variability among copepod species and the contribution of protistan diets as a food source in the study area. Calanus sinicus showed a similar herbivorous TP of 2.0 in both TPGlu and TPAla, suggesting little contribution from protistan diets. Two copepod species (P. parvus s. l. and Acartia omorii) exhibited TPGlu values of approximately 2.0 but their TPAla values increased from 0.1 to 0.5, indicating mixed diets of both primary producers and protists. The other three copepods (Pseudocalanus sp., Oithona similis, and O. atlantica) showed a wide range in TPGlu (2.4–3.1) and TPAla (2.7–3.4), suggesting that protistan trophic transfers enhance TPAla (by up to 0.5) in omnivorous copepods. We found a spatial variation in the TPs of copepods among water masses by various controlling factors including surface seawater temperature, salinity, and size-fractionated Chl-a. Our findings support that the TP values could be potential indicative of interspecies variability, providing useful information on the composition of the planktonic food web.

A comparison of South Pacific Antarctic sea ice and atmospheric circulation reconstructions since 1900

Abstract. The recent changes and record lows in Antarctic sea ice extent illustrate the need for longer estimates beyond the short satellite observation period commencing around 1979. However, Antarctic sea ice extent reconstructions since 1900 based on paleo-records and those generated based on instrumental observations from the Southern Hemisphere midlatitudes are markedly different, especially prior to 1979. Here, these reconstructions are examined with the goal of understanding the relative strengths and limitations of each reconstruction better so that researchers using the various datasets can interpret them appropriately. Overall, it is found that the different spatial and temporal resolutions of each dataset play a secondary role to the inherent connections each reconstruction has with its implied atmospheric circulation. Five Southern Hemisphere pressure reconstructions spanning the 20th century are thus examined further. There are different variabilities and trends poleward of 60∘ S between proxy-based and station-based 20th century pressure reconstructions, which are connected to the disagreement between the Antarctic sea ice extent reconstructions examined here. Importantly, reconstructions based on only coral records provide the best agreement between the early pressure reconstructions, suggesting that a contributing role of tropical variability is present in the station-based pressure (and therefore sea ice) reconstructions. In contrast, ice-core-only reconstructions provide a local, high-latitude constraint that creates differences between the proxy-based and station-based reconstructions near Antarctica. Our results reveal the greatest consistencies and inconsistencies in available datasets and highlight the need to better understand the relative roles of the tropics versus high latitudes in historical sea ice variability around Antarctica.

Distribution of Food Resources for Two Species of the Skate Family (Beringraja pulchra and Okamejei kenojei) in the South Sea of Korea

Distribution of Food Resources for Two Species of the Skate Family (Beringraja pulchra and Okamejei kenojei) in the South Sea of Korea

Feeding Habits of Jack Mackerel, Trachurus japonicus, in the Coastal Waters of South Sea, Korea

Feeding Habits of Jack Mackerel, Trachurus japonicus, in the Coastal Waters of South Sea, Korea

Ephemeral Windows: Limits and Possibilities in the Brazil-USA Relationship, Regarding the South Atlantic

The South Atlantic is a region that has been receiving growing attention, due to the possibilities of changing its geopolitical balance, mainly due to the increase in presence of China and, to a lesser extent, Russia. Having Given the changing trend of the international configuration, exemplified by real Inter-and Intra-state conflicts (Ukraine, Middle East, African regions) and potential (South Sea China, Central Asia, Caucasus), what would be the possibility of the Brazil increases its capacity to project power in region, if by chance this clashed with the interests of the naval hegemonic power (USA)? From the historical approach of two situations in which Brazil achieved positive arrangements with the USA, in amid changing international configurations, sought to establish an analytical standard from which some conclusions were established about the Current and future South Atlantic.

Strange Romanticism: Herman Melville’s Typee (1846)

ABSTRACT In Typee (1846), Herman Melville presents a fictionalized version of his real experience of jumping ship and living with the Tai Pī people on the island of Nuku Hiva in the Marquesas. Melville categorizes Typee as a “strange and romantic” adventure. Many critics have echoed this label, “Romantic,” due to Melville’s revival of an idealized image of South Seas society. Others align Typee’s Romanticism directly with strangeness, which is both an important theme and a formal characteristic of Typee. Melville’s own experience of cultural estrangement enables him to show some sympathy for indigenous people, while his paratexts act as estranging devices. He reworks and reinterprets Romantic-period writings on the Pacific, most notably David Porter’s Journal of a Cruise Made to the Pacific Ocean (1815). I situate Typee as a continuation of the “very long Romanticism” that David Simpson claims emerges in what he calls the era’s “stranger syndrome.” Melville’s Romanticism lies in his refusal either to domesticate or totalize the Tai Pī, which results in an ambiguous portrayal that estranges the reader by challenging the uniqueness of Western culture.

Human rights in Australia’s early international relations: unity, prosperity, and the abolition of slavery

ABSTRACT For the most part, histories of Australia’s international relations locate the origins of its engagement with the international human rights regime in the 1940s. By then, however, debates about human rights had been appearing in the Australian newspapers for more than a century, focused, among other things, on the application of universal rights to the foreign peoples with which the colonies were engaged in their international affairs. Drawing on archival materials and newspaper articles from 1803 to 1901, this article examines the place of human rights in the international relations of nineteenth century colonial Australia. Focusing on debates over the use of Indian and South Sea Islander indentured labour, it demonstrates how ideas developed in the context of the anti-slavery movement of the eighteenth and early nineteenth centuries shaped debates about the universal applicability of human rights in the Australian colonies’ engagements with others. In doing so, it provides an account of the early development of human rights ideas in the Australian colonies and demonstrates how they sought to resist human rights claims in their international affairs, choosing instead to prioritise the pursuit of national (racial) unity and prosperity over the rights of others.

Calico Madams and South Sea Cheats: Global Trade, Finance, and Popular Protest in Early Hanoverian England

AbstractIn the summer of 1719, woolen and silk weavers took to the streets in cities and towns across England to protest the East India Company's importation of cotton calicoes from South Asia. English weavers viewed these popular imports as hurting their economic livelihoods. During the protests, they violently turned their anger against women wearing calico, tearing off their clothes and even throwing acid on some victims. Their actions spurred widespread condemnation, but the weavers got what they wanted in the end. In March 1721, an act banning the importation and use of all calico cloth in Britain received royal assent. On that same day, an act arranging the first in a series of financial rescues of the South Sea Company in the wake of the South Sea Bubble became law. Drawing from a range of archival and printed sources, the author explores the political and cultural connections between the calico crisis and the South Sea Bubble and investigates how reactions to both episodes intersected ideologically with fears of Jacobitism and foreign invasion and with broader anxieties about gender, the social order, and the political influence of financial corporations.

Otariid gammaherpesvirus 1 in South American fur seals (Arctocephalus australis) and a novel related herpesvirus in free-ranging South American sea lions (Otaria byronia): Prevalence and effects of age, sex, and sample type.

Otariid gammaherpesvirus 1 (OtGHV1) is associated with high rates of urogenital carcinoma in free-ranging California sea lions (Zalophus californianus; CSL), and until recently was reported only in the Northern Hemisphere. The objective of this study was to survey free-ranging South American sea lions (Otaria byronia; SASL) and South American fur seals (Arctocephalus australis: SAFS) in Punta San Juan, Peru for OtGHV1 and to determine prevalence characteristics. Twenty-one percent (14/67) of urogenital swabs collected over three years (2011, 2014, 2015) from live pinnipeds of both species tested positive with a pan-herpesvirus conventional PCR. Sequencing of SAFS amplicons revealed 100% homology to OtGHV1 at the DNA polymerase, glycoprotein B, and viral bcl2-like genes. Sequencing of SASL amplicons revealed a novel related virus, herein called Otariid gammaherpesvirus 8 (OtGHV8). For comparison of sample sites, urogenital, conjunctival, and oropharyngeal swabs collected from 136 live pinnipeds of both species at Punta San Juan between 2011-2018 were then assayed using quantitative PCR for a segment of the OtGHV1/8 DNA polymerase gene using a qPCR assay now determined to cross-react between the two viruses. In total, across both species, 38.6% (51/132) of urogenital swabs, 5.6% (4/71) of conjunctival swabs, and 1.1% (1/90) of oropharyngeal swabs were positive for OtGHV1/8, with SASL only positive on urogenital swabs. Results from SASL were complicated by the finding of OtGHV8, necessitating further study to determine prevalence of OtGHV1 versus OtGHV8 using an alternate assay. Results from SAFS suggest a potential relationship between OtGHV1 in SAFS and CSL. Though necropsy surveillance in SAFS is very limited, geographic patterns of OtGHV1-associated urogenital carcinoma in CSL and the tendency of herpesviruses to cause more detrimental disease in aberrant hosts suggests that it is possible that SAFS may be the definitive host of OtGHV1, which gives further insight into the diversity and phyogeography of this clade of related gammaherpesviruses.

Dual Development Direction of Small Sea Ports on The Example of the South Baltic Sea

Dual Development Direction of Small Sea Ports on The Example of the South Baltic Sea

The use of Argo floats as virtual moorings for monitoring the South Baltic Sea

The Argo float measurement network is increasingly effectively covering internal seas and shelf areas. In this paper, a specific approach to using Argo floats as ‘virtual moorings’ within the conditions of the Baltic Sea is presented. Following a series of successful deployments with standard configurations, it was decided that the settings forcing the float to stay at the bottom between profiles should be tested. This significantly reduced the drift of the float and allowed measurements to be made in a limited water area for a longer time. The data obtained from Argo floats used as virtual mooring can be a valuable source for monitoring and analysing the hydrology of individual basins of the Baltic Sea. The results show that the temporal and spatial variability of the observed fields of temperature, salinity, and other properties of seawater is very high. More data are needed to correctly determine the mean properties of the basins and their temporal variability. Therefore, Argo floats can be a source of efficient and inexpensive hydrographic data for shallow seas such as the Baltic.

A Time Series Prediction Method for the Subsurface Thermal Structure of the South Yellow Sea Cold Water Mass

A Time Series Prediction Method for the Subsurface Thermal Structure of the South Yellow Sea Cold Water Mass

Visitation, communication, and participation: an ethical and respectful strategy for engaging Australian South Sea Islander communities when sharing their lived experiences.

This study examines the experiences of three Australian South Sea Islanders from the same community who are part of a larger research team scheduled to engage in an archaeological research project in Mackay, Queensland, in 2021. The aim of the project was to highlight Australian South Sea Islander knowledge, voices, and lived experiences. However, owing to COVID-19 and persistent lockdowns in Queensland and New South Wales, the project faced significant delays. The timeline was adjusted, with plans to reintroduce the project to the community after an 18-month hiatus, aiming to rekindle interest and encourage participation. This study focuses on designing a community engagement strategy that builds on established protocols for researchers working with Australian South Sea Islander communities. The strategy includes three key steps: visitation, communication, and participation. By integrating the Tok Stori methodology-an Indigenous research approach from the Solomon Islands and Vanuatu-the strategy supports the decolonisation of the collaborative research process, enabling the sharing of Australian South Sea Islander lived experiences in a culturally safe manner. The authors provide contextualised reflections, offering insights from an Australian South Sea Islander perspective.

Characterizing anthropogenic litter pollutants in African freshwater ecosystems: A case study of Dunga Beach in Lake Victoria, Kenya

AbstractAnthropogenic litter (AL) in world's aquatic ecosystems presents critical ecological threats to environmental quality, aquatic biodiversity and human welfare. However, most studies on AL have been conducted in marine ecosystems with very little focus being given to freshwater systems like Lake Victoria. This study characterized AL pollutants in Dunga beach in Lake Victoria, Kenya, where sampling was done in the beach, riparian and benthic zones along a 100 m reach for 6 days. Across the sampled reaches, the AL associated with packaging, consumer products, building and construction, transport, electronic wastes, textile, fishery and medical materials were collected, counted, sun‐dried and weighed. AL were more abundant in the beach and riparian zone than in the benthic reaches with plastics being the dominant litter in all reaches. Based on Kruskal–Wallis rank sum test the density of AL associated with packaging and consumer products was significantly higher than other AL in all the reaches. Plastics, polystyrene and glass wastes dominated the beach zone at 31.19%, 12.14% and 11.14%, respectively. In the benthic area, the dominant wastes were plastics, fishery and polystyrene items at 22.14%, 16.34% and 12.14%, respectively. The top 10 AL pollutants in Dunga beach were as follows: bags/food wrappers, bottle caps, diapers, plastic and glass beverage bottles, plastic plates, forks, knives, spoons, straws and e‐wastes. Based on data from literature, several clear patterns emerged when comparing relative AL abundance across other aquatic habitats. In the Lake Michigan Beach, the AL were dominated by plastics (41.2%) followed by cigarettes at 29.3%. In contrast, Chicago River Beach contained more glass wastes (42.1%) while Chicago River Riparian had more plastics (57.8%). At the South Sea of Korea, fishing gear wastes were the majority AL (61.1%). AL consisting of fishing items was restricted to benthic and riparian settings, in which the benthic zone had the most items recorded. It is therefore evident that a large amount of AL waste accumulates at Dunga, Hippo point and other beaches in the world, thus justifying the need for beach cleaning and maintenance strategies. This study presents baseline data that is useful to environmental ecologists, aquatic scientists and management authorities to formulate policies, evaluate guidelines and recommend beach management strategies to conserve aquatic biodiversity, human health and aesthetic value of the freshwater habitats.

남북 그린데탕트 추진을 위한 국내법제 정비 방안

This paper raises the necessity and utility of environmental cooperation in the context of the climate change crisis caused by environmental pollution and the strained North-South relations influenced by the US-China rivalry. It presents a plan for the domestic legal revision needed to facilitate this. Particularly, in the case of North and South Korea, where land and sea are interconnected, a joint response to climate change is necessary, and such cooperation can be mutually beneficial. Additionally, environmental improvement projects in North Korea can enhance the quality of life of its residents, offering a humanitarian aspect and potentially not conflicting with international sanctions against North Korea. In this regard, efforts for environmental cooperation are necessary for both Koreas, and there is a considerable possibility that North Korea will respond to these efforts. According to reports submitted to the UN and others, environmental pollution in North Korea is at a serious level, and there is observed intent to seek international support for its resolution. This situation implies that the resolution of environmental issues between North and South Korea can at least be achieved within the framework of multilateral international cooperation. The South Korean government has proposed the “Green Detente” policy as part of its North Korea policy to address the problems arising from climate change in North and South Korea and East Asia. The Green Detente can be understood as a process that aims for unification through reconciliation and cooperation by enhancing mutual benefits through cooperation in the environmental sector, which is a non-political field. In a situation where political exchanges are difficult, environmental cooperation has the advantage of being less burdensome as it can be conducted through local governments, private sector, or so-called 1.5 track exchanges. However, when examining the current state of domestic legislation for promoting the Green Detente as part of this policy, several limitations and problems have been identified. Firstly, our laws do not anticipate the divided situation and are not formulated to be applicable to North Korean areas. Nor is there a special law for the promotion of Green Detente. Even if there were such a law, it would not be simple to pre-emptively legislate for various unpredictable situations. Therefore, the most useful approach currently available is to create a legislative environment for the implementation of the Green Detente policy by revising laws, particularly those governing North-South relations and laws addressing environmental pollution and disaster preparedness. A brief examination reveals that the Inter-Korean Exchange and Cooperation Act, which regulates all areas of inter-Korean exchange and cooperation, needs revision due to unnecessary and complex regulatory elements concerning environmental exchange and cooperation. Individual environmental laws lack the foundation for research and study on North Korean areas and nearly lack provisions considering the possibility of cooperation with North Korea. Therefore, it is necessary to legislate including plans for cooperation, investigation, and research on North Korean areas in the provisions for establishing basic plans in individual environmental laws. Additionally, provisions related to international cooperation may be difficult to apply to bilateral cooperation issues between North and South Korea. The revision of domestic laws should be done in a way that respects the basic principles of unification under the constitution, does not harm North-South relations, prepares for unification, and complies with international standards on environmental issues.

Metatranscriptomic insights into the microbial metabolic activities during an Ulva prolifera green tide in coastal Qingdao areas

Green tide, a typical marine environmental disaster that profoundly influenced the coastal areas, has been occurred consecutively in the South Yellow Sea of China since 2007. Herein, the active microbial community structure and metabolic pathways in Qingdao offshore during an Ulva prolifera green tide were investigated by using metatranscriptomic approach. The dominant active microbial taxa at the outbreak phase were primarily a functional group that can utilize organic matters derived from U. prolifera, such as Lentibacter, Polaribacter and Planktomarina. While the taxa involved in biogeochemical cycles, including Phaeobacter, Pseudomonas and Marinobacterium, dominated the active microbial communities at the decline phase. The expression level of enzymes involved in U. prolifera polysaccharides degradation was significantly higher at the outbreak phase compared to the decline phase. At the same time, the main players Glaciecola and Polarbacter showed similar trends, suggesting that the low competitiveness for nutrients of related microorganisms at this phase made them degrade more U. prolifera polysaccharides to meet their own nutrient needs, thereby accelerating the degradation of U. prolifera. According to KEGG annotation, the biogeochemical pathways including nitrogen cycle, sulfur cycle and methane oxidation altered during the green tide, with thiosulfate oxidation and methane oxidation probably being the crucial pathways at the outbreak and the decline phase respectively. The coupling of sulfide oxidation and denitrification was also observed in this study. Furthermore, the green tide in Qingdao offshore might impact the greenhouse effects induced by CH4 and N2O through influencing the related microbial processes.