Abstract
Taiwan’s marine ecosystems are increasingly vulnerable to anthropogenic and environmental pressures, highlighting the urgent need for effective biodiversity monitoring. This study investigates existing marine biodiversity observation and monitoring mechanisms in Taiwan to inform future conservation and policy development. The study analyzes three long-term ecological datasets: (1) plankton assemblages in western coastal waters (1993–2021), (2) fish assemblages in northern rocky tide pools, and (3) fish assemblages in southern tide pools. Additionally, it evaluates the Taiwan Marine Environment Monitoring Service (TwMEMS), which integrates real-time and historical oceanographic data for ecological assessment and disaster preparedness. The findings reveal distinct seasonal and regional biodiversity patterns. Plankton communities exhibited peak chlorophyll-a concentrations in the third quarter, indicating nutrient enrichment likely from upwelling or runoff. Fish assemblages showed site-specific species richness, with notable dominance of Bathygobius fuscus and Istiblennius species. TwMEMS data demonstrated improved tsunami detection through advanced filtering techniques, supporting ecosystem risk monitoring. Taiwan’s monitoring systems provide valuable baseline data for assessing long-term ecological change but face challenges in data integration and indicator standardization. Strengthening these frameworks through regional monitoring hubs, standardized biodiversity indicators, and alignment with international platforms such as GBIF and BONs will enhance marine conservation effectiveness. This study emphasizes the role of integrated observation mechanisms in supporting ecosystem-based management and Taiwan’s contribution to global biodiversity goals.
1 Introduction
Marine biodiversity observation and monitoring mechanisms offer instrumental insights for setting effective baseline for detection of human-induced and environmental-induced impacts on the marine environment and modelling of future scenarios based on the ever dynamic global and environmental contexts (; ; ; ). In recent years, there has been a significant demand for oceanographic data especially among blue economies such as Taiwan (; ; ; ) and have been used to achieve a wide range of objectives including engineering design, mitigation of marine hazards, navigation, and environmental protection (; ; ; ; ; ). The collected oceanographic data are important in marine biodiversity observation and formulation of monitoring mechanisms using numerical models and simulation data that covers a wide geographical area over long periods of time (; ; ). Presently, there are a wide range of marine related data centers that collect, process and analyze data that are presented in a friendly and visualization environment that can be efficiently used for marine biodiversity observation and monitoring of the related ecosystems (; ; ). Considering the large diversity of species in the marine environments of countries such as Taiwan, it is necessary to formulate and adopt a multi-faceted marine biodiversity observation and monitoring mechanism that incorporates diverse strategies ranging from educational to legal frameworks for efficient mitigation of environmental impacts and improve public awareness on conservatory practices (; ; ). As such, in Taiwan, there is a need for further understanding of the existing and potential marine biodiversity observation and monitoring mechanisms for effective policy and decision-making support for sustainable development, economic resilience and environmental conservation in the country.
Taiwan has a coastline of 1,988 kilometers and is surrounded by the Pacific Ocean to the east, the East China Sea to the north, and the South China Sea to the southeast. Over 90% of the country’s population lives within 100 kilometers of the coast, and economic, traffic, and recreational activities in Taiwan are inextricably linked to the surrounding oceans (). However, Taiwan is one of the most vulnerable areas in the world, frequently suffering from natural disasters which have direct environmental impacts on marine biodiversity (; ; ). In 1998, a coastal ocean monitoring network was established in Taiwan’s waters to offer real-time oceanographic data for mitigation of the impacts of potential natural disasters and environmental change on marine biodiversity. With the expansion of numerous marine activities and industries along the coastlines, there has been an increase in the frequency of occurrence of tragedies that demands the intervention of government authorities and agencies to enhance the safety of marine operations through effective biodiversity observational programs and monitoring mechanisms. Between 2001 and 2003, the Executive Yuan’s Council for Sustainable Development adopted the Biodiversity Promotion Program, Biodiversity Sustainable Development Action Plan, and Taiwan Sustainable Development Indicator System. In 2005, the Forestry Bureau recommended fourteen biodiversity monitoring indicators, and in 2012, the Sustainability Council reviewed and revised the biodiversity action plan to ensure it met the Aichi targets. Presently, the establishment of the Taiwan Biodiversity Observation Network (TaiBON) is expected to reflect the country’s biodiversity implementation results and serve as a reference for future management and administration of the marine environment, as well as convergence with global databases.
Taiwan has had a long history of biodiversity studies and surveys. However, there is a lack of quality and quantity of relevant biodiversity information at the ecosystem level as well as an effective integration mechanism. Departmental data and government-commissioned survey projects are deeply fragmented which makes it difficult to be integrated to produce a coherent and accurate report on the status of marine biodiversity. As a result, there have been challenges to meet the Convention on Biological Diversity’s Aichi Target as well as the illustration of the nation’s long-term pattern of biodiversity change. In this regard, there is an urgent need for the formulation of a monitoring mechanism for national biodiversity observations and survey data to improve the transparency and integration of domestic biodiversity monitoring data, allowing for the development of significant and representative indicators for better understanding of the state and evolving trends in its marine biodiversity. Also, Taiwan could join other global biodiversity observation networks such as Global Biodiversity Information Facility (GBIF), Encyclopedia of Life (EOL) and Biodiversity Observation Network (BONs) if it establishes an effective national biodiversity monitoring system and indicators. To align Taiwan’s biodiversity growth with global trends, it is imperative for the government to work together with the private sector to adjust the existing policy plans to improve existing biodiversity indicators, address concerns, assess data quality, and increase indicator accuracy for better biodiversity development. The present research study provide a detailed analysis of specific marine biodiversity observation and monitoring mechanisms in Taiwan to provide policy insights for the development of the country’s marine biodiversity.
To strengthen the governance framework, Taiwan’s approach to marine biodiversity observation and monitoring has been guided by several legal instruments. The Ocean Basic Act and Marine Conservation Act establish the general legal foundation, declaring marine environmental protection as a fundamental duty of the State. Building on this, the National Biodiversity Action Plan (NBAP) and the Taiwan Biodiversity Observation Network (TaiBON) embody soft law initiatives that exert significant normative influence while lacking direct enforceability. These instruments enhance Taiwan’s legal soft power by shaping administrative practice and encouraging voluntary compliance from various stakeholders, consistent with contemporary theories of legal soft power.
2 Methods
The primary objective of the present research study is to investigate marine biodiversity observation and monitoring mechanisms in Taiwan. To achieve this objective, the study provides an analytical perspective of the statistical information and results of existing datasets that are focused on marine biodiversity observation and monitoring mechanisms. Considering the significant diversity of marine species, the study analyzes a wide range of datasets that have been collected over different periods of time and geographical locations with the goal of extracting insightful information that are associated with the topic of the research. Also, the study reviews existing academic and practical models that have been used in marine biodiversity observation and monitoring mechanisms both by the government and non-governmental institutions. The adopted research methodology focused on analysis of existing statistical information and models using both primary and secondary sources including bibliographic databases containing journals, proposed models, policy briefs, white papers, as well as the sources of cited references to provide detailed information on the topic of research. The methodology involved the identification of datasets and models that focused on research terms and keywords including ‘marine biodiversity, ‘monitoring mechanisms, ‘species identification’ and ‘ocean biome’. Specifically, the chosen datasets focused on plankton assemblages in western Taiwan coastal water, fish assemblages in rocky tide pools on the northern coast of Taiwan and fish assemblages in rocky tide pools on the southern coast of Taiwan. The chosen model was the Taiwan Marine Environment Monitoring Service (TwMEMS) which is an integrated operational monitoring system for marine environmental parameters.
The first chosen dataset on plankton assemblages in western Taiwan coastal water was sourced from and was supported by the Ministry of Economic Affairs, Bureau of Industry. The dataset contains the results of the quarterly survey of the environmental factors and plankton population on eight transects along the coastline of western Taiwan from 1993 to 2021. The thirteen environmental parameters that were collected included temperature in °C, salinity in ‰, pH, concentration of chlorophyll a in mg × m−3, dissolved oxygen, concentration of, NO1−2, NO1−3, PO3−4, SiO4−4, biochemical oxygen demand BOD, and total suspended solids in mg × l−1, and transparency in m. The validation of the data was done through statistical checks and comparison with independent data. The statistical validation of the data was done by examining the distribution of the parameters using histograms of the chosen environmental variables. The second chosen dataset focused on fish assemblages in rocky tide pools on the northern coast of Taiwan and was sourced from and was supported by the Ministry of Science and Technology. The dataset consists of fish community composition that were collected from three sampling stations in rocky tide pools in the intertidal zone on the northern coast of Taiwan. The fish samples were collected across four seasons by counting the number of anesthetized fishes. The fish were gathered, packaged, and brought to the laboratory on ice. The captured fishes were identified and counted in the lab.
The third chosen dataset focused on fish assemblages in rocky tide pools on the southern coast of Taiwan and was sourced from and was supported by the Ministry of Science and Technology. The dataset consists of fish community composition that were collected from two sampling stations in rocky tide pools in the intertidal zone on the southern coast of Taiwan. The two stations were located near Kenting National Park, which provided habitat and shelter from human activity to coastal fish and were less disturbed by tourists due to the rocky paths to the tide pools and the strong reefs along the coast. As a results, the samples were considered as suitable for time series data on long-term species diversity. The fish samples were collected across four seasons by counting the number of anesthetized fishes. The fish were gathered, packaged, and brought to the laboratory on ice. The captured fishes were identified and counted in the lab. Lastly, the chosen model included in the study was the Taiwan Marine Environment Monitoring Service which is an integrated operational monitoring system for marine environmental parameters, as proposed by . The model incorporates observational data which cover the range of the Northwest Pacific, from 110 degrees to 160 degrees east longitude and 5 degrees to 40 degrees north latitude. The model was developed by the Central Weather Bureau (CWB) of Taiwan and integrates in-situ data from 55 field stations that show real time conditions of the sea states across Taiwan.
3 Results
3.1 Monitoring of plankton assemblages in Western Taiwan coastal water
The findings of the long-term monitoring of plankton assemblages in Western Taiwan coastal water indicated that the distribution of the environmental parameters of interest were within reasonable ranges. According to the results, the pH ranged from 7.1 to 8.4, which corresponded to the range of coastal waters, and only a few metrics had exceptional levels, including salinity (8.1‰) and total suspended solids (877 mg × l−1). The natural logarithm of plankton community density and abundance was also often symmetric or nearly symmetric which showed that they followed the log-normal distribution and, therefore, the most suitable empirical model for ecological analysis of marine environment. The results further found moderate fluctuation at all sites, although the levels of dissolved oxygen remain over 4.0 mg/l, which is critical for most marine life like fish and invertebrates. It is important to note that levels below the 4.0 mg/l level could lead to hypoxia which directly affect marine life. Also, the dataset results show that the third quarter of each year had the highest chlorophyll-a values which is an indication of algal biomass while the first quarter reported the lowest average at 0.53 ± 0.57 (range: 0.02-4.21). The findings imply that the third quarter experiences nutrient enrichment most likely from upwelling, riverine inputs, or anthropogenic sources such agricultural runoff, which directly affects marine biodiversity. As shown in Figure 1, the distribution of key environmental parameters such as pH and chlorophyll-a reveals seasonal nutrient dynamics, providing important insights for detecting early signs of eutrophication and biodiversity stress in coastal ecosystems.
Figure 1
3.2 Monitoring of fish assemblages in rocky tide pools on the northern coast of Taiwan
The results from the first station of data collection indicated that the number of species collected per sample ranged between 4 and 18 and averaged 10.00 ± 2.84 (S.D.) while the number of while the number of physically collected species for every sample ranged between 22 and 184 and averaged 64.66 ± 34.80 (S.D). For the second station, the number of species collected per sample ranged between 5 and 20 and averaged 12.78 ± 3.79 (S.D) while the number of number of physically collected species was 632 for a total of 82 species. In the last station, the number of species collected per sample ranged between 4 and 20 and averaged 9.96 ± 3.71 (S.D) while the number of number of physically collected species was 468 for a total of 64 species. The dataset consisted of a total of 1,577 physically collected marine fish belonging to 106 species were collected at the three stations. According to the results, the most abundant species that were collected during the study included Bathygobius fuscus, Abudefduf vaigiensis, and Istiblennius, Istiblennius dussumieri, and Istiblennius lineatus.Figure 2 illustrates that fluctuations in fish species richness correlate with seasonal and multi-year environmental changes, highlighting areas vulnerable to habitat degradation and suggesting priority sites for conservation measures.
Figure 2

Temporal variations in fish species richness and abundance at three tide pool stations on the northern coast of Taiwan. The figure highlights changes over time and supports interpretation of ecosystem variability due to environmental or anthropogenic stressors. (Source: Adopted from
3.3 Monitoring of fish assemblages in rocky tide pools on the southern coast of Taiwan
The findings from the two stations of the monitoring of fish assemblages in rocky tide pools on the southern coast of Taiwan produced a total of 129 samples. The results indicated fluctuations in the number of species and physically collected samples at the two stations between 2000 and 2018. At the two locations, the average number of species taken per sample was 10.4 ± 3.3 (S.D), while the average number of physically collected samples was 59.7 ± 32.5. The most common species in the samples were Istiblennius lineatus, I. edentulus, and Abudefduf sordidus, A. sordidus, and I. edentulous. Long-term temporal variations in the number of individuals of these abundant species for each station was reported. As depicted in Figure 3, the observed fluctuations in species composition at the southern stations point to the cumulative effects of climate variability and coastal pressures, emphasizing the need for dynamic conservation strategies.
Figure 3

Long-term trends in species richness and abundance of fish assemblages from two rocky tide pool stations on the southern coast of Taiwan (2000–2018). These trends provide baseline data essential for evaluating the impact of environmental disturbances and guiding marine protected area planning. (Source: Adopted from
3.4 Taiwan marine environment monitoring service
The findings highlight the individual component models of the Taiwan Marine Environment Monitoring Service (TwMEMS) that specifically focus on tsunami monitoring and preprocessing of surface elevation data and analysis of swell warning. The surface elevation time series is recorded at the tidal station. The results indicate that elevation is raised by storm surges, astronomical tides, and other local factors. On the same note, abnormal instrumental electric currents or voltage fluctuations cause also cause surges in elevation levels. The results show that hat the three noticeable spikes have been eliminated, and following processing, the reference water level is closer to zero. Figure 4 demonstrates the refinement achieved through spike removal in TwMEMS data, ensuring more accurate detection of abnormal sea-level events that can impact marine and coastal ecosystems.
Figure 4

Surface elevation data before and after spike removal in the Taiwan Marine Environment Monitoring Service (TwMEMS) tidal monitoring system. Effective data preprocessing is vital for improving tsunami risk detection accuracy and supporting coastal hazard mitigation planning. (Source: Adopted from
In terms of the data filtering method for the extraction of tsunami height, the results indicate that the low-pass filter does not completely exclude additional long wave period signals, and that the is a statistically significant difference between the results of low-pass filtering and those of high-pass filtering and band-pass filtering. Also, the model findings show that the high-pass filter cannot identify tsunami height since it produces high-frequency noise and may extract signals with shorter periods. To this end, therefore, the band pass filter is employed and proven to be a suitable technique for tsunami analysis in order to prevent misdiagnosis of tsunami signals by comparing real time results of observation data and historical data. This approach aligns with previous findings by
Figure 5

Results of band-pass filtering applied to surface elevation data to isolate tsunami signals within TwMEMS datasets. Enhanced signal processing contributes to early warning capabilities and safeguards marine biodiversity by improving coastal disaster preparedness. (Source: Adopted from
Moreover, Taiwan’s biodiversity observation framework aligns with the principle of supervision under constitutional environmental rights. Judicial Yuan Interpretation No. 803 emphasizes that the government must protect environmental interests as part of its constitutional obligation. Although Taiwan lacks an extensive body of marine biodiversity-specific case law, administrative enforcement actions under the Marine Conservation Act, Environmental Impact Assessment Act and the Coastal Zone Management Act provide practical examples of legal supervision over marine and coastal biodiversity. These cases illustrate the embeddedness of biodiversity protection in Taiwan’s evolving environmental jurisprudence.
4 Discussion
This study analyzed multiple long-term ecological datasets to identify patterns critical for guiding marine conservation strategies in Taiwan. The monitoring of plankton assemblages highlighted seasonal nutrient dynamics, while the assessment of fish communities in intertidal zones revealed biodiversity trends sensitive to human and environmental pressures. The following discussion integrates these findings, emphasizing their relevance to environmental management frameworks, policy planning, and Taiwan’s alignment with international biodiversity commitments.
The focus of the study was to analyze the findings of marine biodiversity observation and monitoring mechanisms in Taiwan. The findings provide a wide range of long-term monitoring data that can be used to set effective baseline for detection of human-induced and environmental-induced impacts on the marine environment and modelling of future scenarios based on the ever dynamic global and environmental contexts. Detecting ecosystem-level changes also requires appropriate sampling design and resolution, as poor sampling strategies can obscure important biodiversity shifts, particularly under rapid environmental change (
The study findings further highlight the significance of understanding the changes of fish assemblages within in the rocky tide pools on the coastal areas of Taiwan. According to the findings, the detrimental effects of human activity have a significant impact on the assemblage of fish species in the rocky intertidal zone which directly affects land-sea interactions and the different marine fish species within the Taiwanese coastlines (
Taiwan’s regulatory approach to marine biodiversity supervision also draws upon sectoral laws such as the Marine Conservation Act, Environmental Impact Assessment Act, which mandates biodiversity considerations for development projects affecting coastal and marine environments, and the Coastal Zone Management Act, which designates and regulates protected coastal zones. Judicial interpretation further strengthens these duties; notably, Judicial Yuan Interpretation No. 803 explicitly recognizes environmental protection as a constitutional obligation, thereby framing biodiversity monitoring as an expression of fundamental rights.
In addition, building marine biodiversity monitoring into Taiwan’s constitutional framework of environmental rights not only strengthens domestic protection and governance but also enhances Taiwan’s credibility and capacity to participate in international platforms such as the Global Biodiversity Information Facility (GBIF) and the Biodiversity Observation Network (BON). Recognizing the legal underpinnings of observation mechanisms, even in the absence of abundant case law, is crucial for demonstrating Taiwan’s commitment to international environmental legal norms and soft law instruments like the Aichi Biodiversity Targets and the post-2020 Global Biodiversity Framework.
The Taiwan Marine Environment Monitoring Service (TwMEMS) is identified as an important tool in marine biodiversity observation and monitoring. The service is designed to integrate maritime environmental data from ship reports, numerical models, and in-situ and remote sensing observations to enhance the safety of various marine-related operations in Taiwanese seas (
5 Conclusion
The study provided a detailed analysis of specific marine biodiversity observation and monitoring mechanisms in Taiwan to provide policy insights for the development of the country’s marine biodiversity. Marine biodiversity observation and monitoring mechanisms offer instrumental insights for setting effective baselines for detection of human-induced and environmental-induced impacts on the marine environment and formulation of future scenarios that account for the dynamic global and environmental contexts.
Additionally, the datasets analyzed offer actionable insights for marine spatial planning, pollution management, and coastal conservation. We recommend the development of a national biodiversity data platform, the implementation of regional monitoring hubs, integration of citizen science, and alignment with global networks such as GBIF, GOOS, and BONs. These strategies will improve indicator development, data transparency, and the accuracy of biodiversity assessments in Taiwan.
Furthermore, the marine biodiversity observation and monitoring mechanisms discussed in this study can serve as a critical foundation for advancing ecosystem-based management (EBM) approaches in Taiwan. By systematically collecting and integrating long-term ecological data, Taiwan is better positioned to move beyond species-specific management towards holistic, ecosystem-level governance. In addition, the establishment of robust monitoring frameworks supports Taiwan’s ability to align with international commitments, such as the Aichi Biodiversity Targets under the Convention on Biological Diversity (CBD) and the United Nations Sustainable Development Goals (SDGs), particularly Goal 14 (Life Below Water). Strengthening these observation mechanisms will also facilitate Taiwan’s deeper participation in global biodiversity platforms such as the Global Biodiversity Information Facility (GBIF) and the Biodiversity Observation Network (BON), enhancing both national conservation planning and international data sharing efforts. These developments are essential steps toward promoting biodiversity resilience, improving marine policy integration, and contributing to global biodiversity conservation initiatives.
To enhance Taiwan’s marine biodiversity monitoring system, several targeted actions are recommended. First, establishing regional biodiversity monitoring hubs would enable more localized, high-resolution data collection, particularly in ecologically sensitive coastal areas. Second, developing standardized biodiversity indicators aligned with international frameworks, such as the Essential Biodiversity Variables (EBVs), would improve data comparability and facilitate reporting to global databases like GBIF and BON. Third, integrating citizen science programs, such as community-based reef monitoring and intertidal biodiversity surveys, could significantly expand data coverage while enhancing public engagement. Fourth, Taiwan should prioritize the creation of a centralized, publicly accessible national marine biodiversity data platform to improve transparency, support academic research, and inform management decisions. Lastly, fostering cross-sectoral collaboration between governmental agencies, research institutions, and NGOs will be essential to ensure a cohesive, ecosystem-based approach to marine conservation planning and policy development.
In conclusion, marine biodiversity observation and monitoring mechanisms are a useful tool for the determination of the long-term patterns in the ecology of marine species and the intertidal ecosystem in the coastlines of Taiwan.
Statements
Data availability statement
The original contributions presented in the study are included in the article/supplementary material. Further inquiries can be directed to the corresponding author.
Author contributions
Y-CS: Writing – review & editing, Writing – original draft.
Funding
The author(s) declare that financial support was received for the research and/or publication of this article. This study was financed by grants from the Taiwan National Science and Technology Council (NSTC 114-2119-M-004-003, NSTC 113-2119-M-004-001).
Acknowledgments
The author thanks the reviewers from this journal for their valuable comments and all the individuals who assisted in this study.
Conflict of interest
The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Generative AI statement
The author(s) declare that no Generative AI was used in the creation of this manuscript.
Publisher’s note
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Summary
Keywords
marine environmental protection, oceanographic data, marine biodiversity, monitoring mechanism, monitoring indicators
Citation
Shih Y-C (2025) A study of marine environmental protection and biodiversity observation and monitoring mechanisms in Taiwan. Front. Mar. Sci. 12:1605996. doi: 10.3389/fmars.2025.1605996
Received
04 April 2025
Accepted
06 May 2025
Published
06 June 2025
Volume
12 - 2025
Edited by
Mehran Idris Khan, University of International Business and Economics, China
Reviewed by
Khadija Zulfiqar, Dalian Maritime University, China
Muhammad Fahad Anwar, University of Sahiwal, Pakistan
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Copyright
© 2025 Shih.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Yi-Che Shih, shih@gs.ncku.edu.tw
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