Mangrove Ecosystem Research Articles

Temporal Variations in Methane Emissions from a Restored Mangrove Ecosystem in Southern China

The role of coastal mangrove wetlands in sequestering atmospheric carbon dioxide has been increasingly investigated in recent years. While studies have shown that mangroves are weak sources of methane (CH4) emissions, measurements of CH4 fluxes from these ecosystems remain scarce. In this study, we examined the temporal variation and biophysical drivers of ecosystem-scale CH4 fluxes in China’s northernmost mangrove ecosystem based on eddy covariance measurements obtained over a 3-year period. In this mangrove, the annual CH4 emissions ranged from 6.15 to 9.07 g C m−2 year−1. The daily CH4 flux reached a peak of over 0.07 g C m−2 day−1 during the summer, while the winter CH4 flux was negligible. Latent heat, soil temperature, photosynthetically active radiation, and tide water level were the primary factors controlling CH4 emissions. This study not only elucidates the mechanisms influencing CH4 emissions from mangroves, strengthening the understanding of these processes but also provides a valuable benchmark dataset to validate the model-derived carbon budget estimates for these ecosystems.

Isolation of Cellulolytic Bacillus sp. from the Viviparous Seedling Hypocotyls of Red Mangrove – Rhizophora mucronata Lam.

Mangroves are one of the world’s most unique tropical coastal ecosystems. They are a rich repository of biological wealth, including specially adapted flora and fauna. The microbiome component of this ecosystem is a fascinating world that is yet to be fully explored for its functional and ecological inter-relationships with its hosts. The mangrove ecosystem is a hidden treasure of microbial diversity, without which mangrove biology is incomplete. In the present study, the isolation of a cellulase-producing, endophytic Bacillus sp. from the hypocotyl region of viviparous seedlings is described. This study urges us to look into the microbial diversity of mangrove propagules, by presenting a glimpse of a member of the endospheric microbiome of viviparous hypocotyls.

Fate and drivers of mariculture-derived microplastics from ponds to mangrove forests

Due to the combined influences of marine and terrestrial disturbances, the sources of microplastics (MPs) in mangrove ecosystems are complex and diverse. Previous studies have inferred the possible involvement of mariculture activities as a potential source of mangrove MPs based on the characteristics of MPs. However, the direct contributions of mariculture-derived MPs to mangrove MPs remain largely unknown. In this study, we systematically investigated the fate of MPs in the discharge of mariculture wastewater by quantifying the source contributions of mariculture-derived MPs to rivers and mangroves. The majority of detected MPs were transparent fibers, with their composition primarily comprising materials commonly used in mariculture activities such as polyvinylpyrrolidone (PVP), polyethylene terephthalate (PET), and nylon. The partial least squares path model elucidated the relationships among the composition of MPs in ponds, rivers, and mangroves, indicating that ponds exert a substantial direct effect on mangroves, particularly significant in the sediments (63.68%). Water turbidity, sediment carbon content, and sediment particle size are key ecological factors influencing the abundance of mariculture-derived MPs. This study provides compelling evidence regarding the sources of mangrove MPs and novel insights into mitigating the dissemination of MPs.

Determining the payment for ecosystem services of mangrove forests: The approach combining ecosystem services and social-economic level and application in Shankou National Nature Reserve, Guangxi, China

Mangrove wetlands are among the ecosystems with the highest value of ecosystem services worldwide. Determining the standards of payment for ecosystem services based on the value of ecosystem services is a crucial aspect of the socio-ecological feedback linked to ecosystem services. The gap between the current standards of payment for ecosystem services and those based on the value of ecosystem services may result in inadequate sustainability and effectiveness of ecosystem conservation and management. In view of this, this study aims to determine the standard of payment for mangrove ecosystem services based on the value of mangrove ecosystem services, and subsequently identify the gap in the current payment. This study assessed the value of mangrove ecosystem services in the Guangxi Shankou Mangrove Ecological National Nature Reserve based on the distinction of use value and the non-use value, and then calculated the standard of payment for mangrove ecosystem services by combining social-economic level. The results indicate that the establishment of the nature reserve has effectively increased the value of mangrove ecosystem services. However, the local residents' lack of awareness of the value of mangrove ecosystem services and the current standard of payment for mangrove ecosystem services is substantially low, which has resulted in a low willingness to participate in mangrove conservation.

Datasets of fungal diversity and pseudo-chromosomal genomes of mangrove rhizosphere soil in China

With climate change and anthropic influence on the coastal ecosystems, mangrove ecosystems are disappearing at an alarming rate. Accordingly, it becomes important to track, study, record and store the mangrove microbial community considering their ecological importance and potential for biotechnological applications. Here, we provide information on mangrove fungal community composition and diversity in mangrove ecosystems with different plant species and from various locations differing in relation to anthropic influences. We describe twelve newly assembled genomes, including four chromosomal-level genomes of fungal isolates from the mangrove ecosystems coupled with functional annotations. We envisage that these data will be of value for future studies including comparative genome analysis and large-scale temporal and/or spatial research to elucidate the potential mechanisms by which mangrove fungal communities assemble and evolve. We further anticipate that the genomes represent valuable resources for bioprospecting related to industrial or clinical uses.

Association of Crab Species with the Mangrove Ecosystem in Gili Sulat East Lombok

The mangrove ecosystem is inhabited by various macroinvertebrates, such as brachyuran crabs, hermit crabs, gastropods, and bivalves. The mangrove ecosystem is a primary habitat for crabs to grow and develop, and it serves as a nursery ground for young organisms before they reach adulthood. This research was conducted from September 2023 to June 2024 in Gili Sulat, East Lombok. The aim of this study is to determine the diversity of crabs in Gili Sulat and their association with mangrove species. The method used in this research is purposive sampling, taking into account the density of mangroves.The study found 12 mangrove species: Rhizophora mucronata, Rhizophora stylosa, Rhizophora apiculata, Ceriops tagal, Excoecaria agallocha, Bruguiera gymnorrhiza, Pemphis acidula, Avicennia marina, Lumnitzera racemosa, Xylocarpus rumphii, Cordia subcordata, and Osbornia octodonta. The mangrove density at station 1 was 1800 ind/ha, at station 2 was 1222 ind/ha, and at station 3 was 2411 ind/ha. The crabs found included 3 species: Baptozius vinosus, Notonyx sp, and Portunus pelagicus. The abundance of crabs at station 1 was 55.6 ind/ha, at station 2 was 33.3 ind/ha, and at station 3 was 66.7 ind/ha. The correlation between mangrove density and crab abundance had a coefficient of determination of 91.6%, indicating that mangrove density can significantly influence crab abundance. There is one species of crab that has a positive association with one species of mangrove, namely the crab species Baptozius vinosus and the mangrove species Rhizophora mucronata.

Kondisi Terumbu Karang Di Perairan Leato Selatan Kecamatan Dumbo Raya Provinsi Gorontalo

Coral reefs are one of the tropical aquatic ecosystems which have a very important function both for the organisms that build this ecosystem and the surrounding ecosystems, namely seagrass ecosystems and mangrove ecosystems. Coral reef ecosystems are coastal area resources that are very vulnerable to damage, especially caused by human behavior/surrounding communities. The aim of the research is to determine the percentage of coral cover and coral reef mortality index in South Leato waters. This research was carried out from February to March 2024, located in South Leato Waters, Dumbo Raya District, Gorontalo Province. The research uses the Underwater Photo Transect (UPT) method, where the data is processed and analyzed with CPCe software. Based on the percentage of live coral cover from each station, namely Station I of 48.53% is in the medium category, Station II of 27.56% is in the medium category, Station III of 39.97% is in the medium category. With an average live coral cover of 38.69%, it is in the medium category, referring to the Decree of the Minister of Environment No. 4 of 2001 concerning Standard Criteria for Coral Reef Damage. The percentage level of coral reef damage calculated using the Mortality Index is station I at 0.46, station II at 0.66, station III at 0.67. The average mortality index for coral reefs in South Leato waters is 0.59, falling into the high mortality index category.

New Secondary Metabolites of Mangrove-Associated Strains.

Positioned at the dynamic interface between terrestrial and marine realms, mangroves embody a vibrant tapestry of biodiversity, encompassing an array of plants, animals, and microorganisms. These microbial inhabitants of mangrove habitats have emerged as a pivotal resource for antimicrobials and a plethora of pharmaceutically valuable compounds, spanning enzymes, antineoplastic agents, pesticides, immunosuppressants, and immunomodulators. This review delves into the recent landscape (January 2021 to May 2024, according to the time of publication) of novel secondary metabolites isolated from mangrove-associated microorganisms, analyzing 41 microbial strains that collectively yielded 165 distinct compounds. Our objective is to assess the productivity and potential of natural products derived from microbial populations within mangrove ecosystems in recent times. Notably, fungi stand out as the preeminent contributors to the emergence of these novel natural products, underscoring their pivotal role in the bioprospecting endeavors within these unique environments.

Fiddler crabs (Tubuca arcuata) as bioindicators of microplastic pollution in mangrove sediments

In recent years, microplastics (MPs) have been widely found in the environment and pose potential risks to ecosystems, which attracted people's attention. Using bioindicators has been a great approach to understanding the pollution levels, bioavailability, and ecological risks of pollutants. However, only few studies have investigated MPs in mangrove ecosystems, with few bioindicators of MPs. Herein, the distribution of MPs in mangrove sediments and fiddler crabs (Tubuca arcuata) in mangroves was investigated. Results showed that the abundance values of MPs are 1160‒12,120 items/kg and 11–100 items/ind. in mangrove sediments and fiddler crabs, respectively. The dominant shape of MPs detected in mangrove sediments and fiddler crabs was fragments with sizes of 20‒1000 μm, larger MPs of 50–1000 μm were found in abundance. Polypropylene (PP), which is one of the most commonly used plastic materials, was the main polymer type. The distribution of MPs in fiddler crabs closely resembled that in surface mangrove sediments with a strong linear correlation (R2 > 0.8 and p < 0.05) between their abundance. Therefore, the MP contamination level in mangrove sediments can be determined by studying MP pollution in fiddler crabs. Moreover, the results of the target group index (TGI) indicated that fiddler crabs prefer feeding specific MPs in mangrove sediments. Our findings demonstrate the suitability of fiddler crabs as bioindicators for assessing MP pollution in mangrove sediments.

Abundance and diversity of macro-invertebrates in the selected mangrove species along the coast of Mbegani in Bagamoyo District, Tanzania

BackgroundMangrove forests are highly productive ecosystems that serve as biodiversity points, containing many organisations, contributing to carbon storage, improving water quality and providing ecosystem goods and services to improve local means of subsistence. These resilient ecosystems are characterised by their morphological modification and their particular respiratory structures (pneumatophores), which allow them to proliferate in salt-rich environments. Mangroves play a crucial role in maintaining invertebrate and fishery resources, providing shelter and nutrients to a diverse range of species. However, mangrove ecosystems are threatened by anthropogenic activities such as the extraction of building materials, firewood, crushing plants and salt manufacturing, resulting in the disintegration of ecosystems and the loss of inhabitants. This study aimed to determine the abundance and diversity of macro-benthic invertebrates on the different parts (roots, stems and leaves) of common mangrove species of the Mbegani coast, along the Indian Ocean using a completely randomised design.ResultsThe sampling was done using a 1 m2 quadrat focussed on the three mangrove parts, viz. roots, stems and leaves. The results showed that the highest percentage of macro-invertebrates were recorded on Bruguera gymnorhiza (66.8%), followed by Avicennia marina (20.8%) and the least were Ceriops tagal (12.4%), such variation differed significantly between the three mangrove species across the selected plots (F(2,524) = 5.71, p = 0.035). The stems (54.4%) inhabited a large number of macro-invertebrates, followed by roots (32.8%) and the least were leaves (12.8%), which varied significantly between the three mangrove parts sampled across the selected mangrove species (F(2,524) = 7.25; p = 0.008). The majority of macro-invertebrates were planktonic feeders stuck on stems or herbivores shuttling between the roots and leaves of the plants. Macro-invertebrates recorded on Bruguiera gymnorhiza were more diverse than those found in C. tagal. The findings emphasise the importance of macro-invertebrates in the ecological balance of mangrove ecosystems.ConclusionThe study concludes that mangroves in the Mbegani ecosystem have a high potential for biodiversity and are important for the coastal community and the ecosystem of the Bagamoyo District. The results contribute to coastal resources management programmes and future surveillance activities.

Mangrove Ecosystem Condition at Three Regency on The East Coast of North Sumatra: A Review

Mangrove Ecosystem Condition at Three Regency on The East Coast of North Sumatra: A Review

Existing Conditions of Gastropod Communities in Areas Affected by Nickel Mining Overburden in the Mangrove Ecosystem of Dawi-Dawi, Southeast Sulawesi

ARTICLE HIGLIGHTS- Nickel mining activities significantly impacted the ecological integrity of the Pomalaa coastal area in Southeast Sulawesi, particularly in the mangrove ecosystem.- The exposure of overburden waste in the mangrove ecosystem has led to the loss of important gastropod species and a decline in population of surviving species- The low population of gastropod species in nickel mining impact areas indicates extensive environmental damage caused by these activities.ABSTRACTGastropod resources in the Dawi-Dawi mangrove ecosystem, Southeast Sulawesi are greatly influenced by the input of overburden waste (sediment) from nickel mining activities. This condition has been going on for the last 2 decades and has degraded the habitat and structure of the gastropod community. The upstream connectivity (the existing nickel mining area) and the Dawi-Dawi River estuary mean that the mangrove forest (estuary) in this area is continuously affected by (massive) overburden runoff. This research was carried out in June-August in the mangrove ecosystem of Dawi-Dawi Village, Southeast Sulawesi Province. This research aims to determine the existing condition of mangrove gastropods affected by overburden. This research began by conducting initial observations in the field, to identify mangrove ecosystems affected by overburden. research stations were determined using a purposive sampling technique (targeted) and sampling gastropods using a simple random sampling method. The ecological index of the mangrove gastropod community affected by overburden shows a tendency for a medium diversity index (H'=1.81), low species richness (R=1.42), high evenness (E=1.12), and no dominance of certain species (C=0.19). The gastropod species found are typical types that make up the mangrove fauna, namely Terebralia sulcata, Terebralia palustris, Faunus ater, Telescopium telescopium, Hebra nigra, and several taxa (genus) of climbing Littoraria snails (periwinkle) which are found in the roots, stems and leaves of mangroves. The abundance of gastropods obtained was also very low, namely around 0-12 Ind./m2. At some points (rarely) schools of small snails of the type T. sulcata (5-21 Ind./m2) are sometimes found. This research shows de facto that overburden waste eliminates (survival) or reduces the diversity and richness of gastropod species (ecological index) in the mangrove ecosystem of Dawi-Dawi.

Microplastics On Mangrove Ecosystem and Scope of Biodegradation—a Review

Microplastics On Mangrove Ecosystem and Scope of Biodegradation—a Review

Potential for developing a sustainable fishing sector in Sukamara

This research explores the potential of a sustainable fisheries sector in Sukamara Regency, Central Kalimantan, which is rich in fisheries resources, both freshwater and marine. This study identified the potential for freshwater fish production of 10,000 tons annually and marine fish of 8,000 tons yearly, with superior species such as snakehead fish, baung, catfish, snapper, grouper, and tuna. Although the fishing sector has an essential role in the local economy, unsustainable fishing practices have led to overfishing, environmental degradation, infrastructure problems, and limited technological knowledge. This research emphasizes the importance of sustainable fisheries practices through ecosystem-based management, the use of environmentally friendly technology, and education and training programs to increase the capacity of fishermen. The economic impact shows an increase in the average income of fishermen by 25%, while the social impact includes an increase in the welfare of coastal communities by 20%. Environmental impacts include the restoration of mangrove and coral reef ecosystems with increased area and cover of live coral. The main challenges include overfishing, environmental degradation, lack of infrastructure, and limited technological knowledge. Proposed strategies to overcome these challenges include strengthening policies and regulations, improving infrastructure, education and training, multi-stakeholder collaboration, and research and development. By implementing this strategy, the potential of the sustainable fisheries sector in Sukamara can be optimized, providing significant economic, social, and environmental benefits and becoming a model for other regions in sustainable natural resource management.

Time series monitoring and analysis of Pakistan’s mangrove using Sentinel-2 data

Sustainable Development Goal-14 (SDG-14) directly demands the protection, conservation, restoration, and sustainable management of the global mangrove ecosystem. Assessment of the development Pakistan has made toward the sustainable management of mangrove ecosystems necessitates the remote sensing-based evaluation of national-level mangrove cover. Using Google Earth Engine (GEE) for geoprocessing 12,000+ 10-m high-spatial resolution Sentinel-2 time-series images (2016–23) and applying random forest (RF) classifier, the current research provides the latest spatial distribution of mangroves along Pakistan’s coastline and changes observed for a duration of 8 years. Additionally, this research provides the first spatiotemporal health assessment of Pakistan’s national mangrove cover as well. Rational analysis of the results indicated splitting the entire timeline based on two seasons (Jan–Jun and Jul–Dec). Results revealed an overall increase of 1,210 km2 (2023) in the mangrove cover on the national-level; a 3.42 km2 average annual increase from 2016 (1,186 km2). Mangrove gain/loss assessment based on the land use land cover (LULC) transition matrix illustrated 223 km2 gain and 199 km2 loss; a 24 km2 net gain. Declines of 20.28% and 7.91% were found in maximum- and mean-NDVI (2016-23), depicting the deteriorating mangrove health conditions. Likewise, significant Sen’s slope analysis (p &amp;lt; 0.05) indicated that 88.8% of all the mangrove-NDVI pixels exhibited an overall decrease, whereas 11.2% pixels showed an overall increase (2016-23). It was concluded that despite showing a growth in the extent, mangrove cover in Pakistan has shown a decline in health, primarily due to deforestation for urban operations and sea-level rise, still making them vulnerable and potentially leading to a disrupted ecosystem, including carbon release in the atmosphere. This study will assist in the formulation of mangrove conservation and management strategies, whereas future research can explore the potentials of land surface temperature (LST) and evapotranspiration in combination to the NDVI for an in-depth analysis of the health status of mangroves.

Economic valuation of mangrove ecosystem in Tana Tidung Regency

Mangrove ecosystems are found in the area where land meets the sea. Potential of mangrove ecosystem are abundant because of their significant ecological and economic role, mangroves are known as multifunctional ecosystems. Ponds and the associated biota are two examples of the direct and indirect benefits of mangrove ecosystems. The research aim is to calculate the potential benefits of mangrove ecosystems in Tanah Tidung Regency. The method used for calculation of the value of resource benefits using the total economic value approach. The results showed that the Potential Use Value of mangrove ecosystems in Tana Tidung Regency reached Rp 305.529.644.089 per/year. So, it can be ascertained that mangroves have great potential in improving the welfare of people who can utilize them.Keywords: Economic Value; Mangrove; Tana Tidung

Land Cover Mapping in a Mangrove Ecosystem Using Hybrid Selective Kernel-Based Convolutional Neural Networks and Multi-Temporal Sentinel-2 Imagery

Mangrove ecosystems provide numerous ecological services and serve as vital habitats for a wide range of flora and fauna. Thus, accurate mapping and monitoring of relevant land covers in mangrove ecosystems are crucial for effective conservation and management efforts. In this study, we proposed a novel approach for mangrove ecosystem mapping using a Hybrid Selective Kernel-based Convolutional Neural Network (HSK-CNN) framework and multi-temporal Sentinel-2 imagery. A time series of the Normalized Difference Vegetation Index (NDVI) products derived from Sentinel-2 imagery was produced to capture the temporal behavior of land cover types in the dynamic ecosystem of the study area. The proposed algorithm integrated Selective Kernel-based feature extraction techniques to facilitate the effective learning and classification of multiple land cover types within the dynamic mangrove ecosystems. The model demonstrated a high Overall Accuracy (OA) of 94% in classifying eight land cover classes, including mangrove, tidal zone, water, mudflat, urban, and vegetation. The HSK-CNN demonstrated superior performance compared to other algorithms, including random forest (OA = 85%), XGBoost (OA = 87%), Three-Dimensional (3D)-DenseNet (OA = 90%), Two-Dimensional (2D)-CNN (OA = 91%), Multi-Layer Perceptron (MLP)-Mixer (OA = 92%), and Swin Transformer (OA = 93%). Additionally, it was observed that the structure of the network, such as the types of convolutional layers and patch sizes, affected the classification accuracy using the proposed model and, thus, the optimum scenarios and values of these parameters should be determined to obtain the highest possible classification accuracy. Overall, it was observed that the produced map could offer valuable insights into the distribution of different land cover types in the mangrove ecosystem, facilitating informed decision-making for conservation and sustainable management efforts.

Peran SAMPAN Kalimantan dalam Konservasi Mangrove di Kalimantan Barat

This research aims to describe the role of SAMPAN Kalimantan as an NGO that contributes to the preservation of mangrove ecosystems as an effort to adapt to climate change. This research uses a qualitative descriptive research methodology with data processing using source triangulation. In addition, researchers used the theory of the role of non-governmental organizations (NGOs) to analyze the role of SAMPAN Kalimantan in mangrove conservation. The results of this research are that SAMPAN Kalimantan, which runs the program in Kubu Raya, has begun to fulfill its role as an NGO, namely as Executor/Implementer, Catalyst and Partner. As the Executor, it is known that there are several activities carried out by the community that can benefit the general public and provide employment opportunities and benefits for the local community by utilizing existing natural resources, one of which is the potential for fish, shrimp and crabs. As a catalyst, SAMPAN Kalimantan has encouraged areas that have not received permits to become social forestry since 2013.

Correlation Analysis Between Climatic Parameters And Their Effect On Evapotranspiration At Bhitarkanika National Park Region, Odisha, India

In order to evaluate the link between a few chosen meteorological characteristics and their association with potential evapotranspiration (PET), which was determined using the correlational approach, a research was conducted in the Bhitarkanika National Park Area, Odisha. Temperature, humidity, wind speed, and sun radiation made up the chosen climatic variables. Strong positive and negative correlations between PET and temperature, sun radiation, wind speed, and humidity were observed to show the effects on mangrove ecosystems . In addition, rainfall was abundant from April through October, with August seeing the most. Investigating their potential future changes and related implications requires accurate simulations of these variables from climate models, both in terms of values and changes over time. This paper aims to explain the usefulness of the linear correlation coefficient between two variables in identifying the level of multicollinearity and the mediating/moderating status of independent variables in a model.

Analysis Of Mangrove Land Cover In The Sawo Marine Conservation Area, North Nias District

Sawo sub-district of North Nias Regency has a mangrove ecosystem that has been designated as a Regional Marine Conservation Area (KKLD) with an area of 29,230.85 ha. The 2005 earthquake and tsunami are reported to have caused damage to mangrove ecosystems due to rising land levels. The increase in land surface has resulted in the destruction of mangroves in this area. This has an impact on the sustainability of the mangrove ecosystem in this region and is important to study. The purpose of this study is to analyze changes in mangrove land cover after the tsunami in 2006 to 2022 and to analyze the impact of changes in mangrove land cover. The results found that mangrove land cover continues to experience a reduction in area, in 2006 an area of 139.78 ha and continues to decline until the remaining 70.87 ha in 2022. This is due to the increasing population growth that causes mangrove forest degradation and land conversion into agricultural land, plantations and infrastructure. The increase in population is a driving force, land clearing for settlements and plantations is a pressure factor (Pressures), land use change is a factor of existing conditions (State), reduced mangrove land area is part of the impact (Impact) and coastal spatial planning, counseling to reforestation is a response (Response). Land conversion to other uses is a contributing factor to the continued loss of mangrove land in this area.Keywords: Mangrove, Land cover, GIS, DPSIR